@x402/evm - npm Package Compare versions

Comparing version 2.3.1 to 2.4.0

dist/cjs/permit2-CzKPU5By.d.ts

+import { SchemeNetworkClient, PaymentRequirements, PaymentPayloadContext, PaymentPayloadResult } from '@x402/core/types';
+import { C as ClientEvmSigner } from './signer-3KGwtdNT.js';
+
+/**
+ * EVM client implementation for the Exact payment scheme.
+ * Supports both EIP-3009 (transferWithAuthorization) and Permit2 flows.
+ *
+ * Routes to the appropriate authorization method based on
+ * `requirements.extra.assetTransferMethod`. Defaults to EIP-3009
+ * for backward compatibility with older facilitators.
+ *
+ * When the server advertises `eip2612GasSponsoring` and the asset transfer
+ * method is `permit2`, the scheme automatically signs an EIP-2612 permit
+ * if the user lacks Permit2 approval. This requires `readContract` on the signer.
+ */
+declare class ExactEvmScheme implements SchemeNetworkClient {
+    private readonly signer;
+    readonly scheme = "exact";
+    /**
+     * Creates a new ExactEvmClient instance.
+     *
+     * @param signer - The EVM signer for client operations.
+     *   Must support `readContract` for EIP-2612 gas sponsoring.
+     *   Use `createWalletClient(...).extend(publicActions)` or `toClientEvmSigner(account, publicClient)`.
+     */
+    constructor(signer: ClientEvmSigner);
+    /**
+     * Creates a payment payload for the Exact scheme.
+     * Routes to EIP-3009 or Permit2 based on requirements.extra.assetTransferMethod.
+     *
+     * For Permit2 flows, if the server advertises `eip2612GasSponsoring` and the
+     * signer supports `readContract`, automatically signs an EIP-2612 permit
+     * when Permit2 allowance is insufficient.
+     *
+     * @param x402Version - The x402 protocol version
+     * @param paymentRequirements - The payment requirements
+     * @param context - Optional context with server-declared extensions
+     * @returns Promise resolving to a payment payload result (with optional extensions)
+     */
+    createPaymentPayload(x402Version: number, paymentRequirements: PaymentRequirements, context?: PaymentPayloadContext): Promise<PaymentPayloadResult>;
+    /**
+     * Attempts to sign an EIP-2612 permit for gasless Permit2 approval.
+     *
+     * Returns extension data if:
+     * 1. Server advertises eip2612GasSponsoring
+     * 2. Signer has readContract capability
+     * 3. Current Permit2 allowance is insufficient
+     *
+     * Returns undefined if the extension should not be used.
+     *
+     * @param requirements - The payment requirements from the server
+     * @param result - The payment payload result from the scheme
+     * @param context - Optional context containing server extensions and metadata
+     * @returns Extension data for EIP-2612 gas sponsoring, or undefined if not applicable
+     */
+    private trySignEip2612Permit;
+}
+
+/**
+ * ERC20 allowance ABI for checking approval status.
+ */
+declare const erc20AllowanceAbi: readonly [{
+    readonly type: "function";
+    readonly name: "allowance";
+    readonly inputs: readonly [{
+        readonly name: "owner";
+        readonly type: "address";
+    }, {
+        readonly name: "spender";
+        readonly type: "address";
+    }];
+    readonly outputs: readonly [{
+        readonly type: "uint256";
+    }];
+    readonly stateMutability: "view";
+}];
+/**
+ * Creates transaction data to approve Permit2 to spend tokens.
+ * The user sends this transaction (paying gas) before using Permit2 flow.
+ *
+ * @param tokenAddress - The ERC20 token contract address
+ * @returns Transaction data to send for approval
+ *
+ * @example
+ * ```typescript
+ * const tx = createPermit2ApprovalTx("0x...");
+ * await walletClient.sendTransaction({
+ *   to: tx.to,
+ *   data: tx.data,
+ * });
+ * ```
+ */
+declare function createPermit2ApprovalTx(tokenAddress: `0x${string}`): {
+    to: `0x${string}`;
+    data: `0x${string}`;
+};
+/**
+ * Parameters for checking Permit2 allowance.
+ * Application provides these to check if approval is needed.
+ */
+interface Permit2AllowanceParams {
+    tokenAddress: `0x${string}`;
+    ownerAddress: `0x${string}`;
+}
+/**
+ * Returns contract read parameters for checking Permit2 allowance.
+ * Use with a public client to check if the user has approved Permit2.
+ *
+ * @param params - The allowance check parameters
+ * @returns Contract read parameters for checking allowance
+ *
+ * @example
+ * ```typescript
+ * const readParams = getPermit2AllowanceReadParams({
+ *   tokenAddress: "0x...",
+ *   ownerAddress: "0x...",
+ * });
+ *
+ * const allowance = await publicClient.readContract(readParams);
+ * const needsApproval = allowance < requiredAmount;
+ * ```
+ */
+declare function getPermit2AllowanceReadParams(params: Permit2AllowanceParams): {
+    address: `0x${string}`;
+    abi: typeof erc20AllowanceAbi;
+    functionName: "allowance";
+    args: [`0x${string}`, `0x${string}`];
+};
+
+export { ExactEvmScheme as E, type Permit2AllowanceParams as P, createPermit2ApprovalTx as c, erc20AllowanceAbi as e, getPermit2AllowanceReadParams as g };

dist/cjs/signer-3KGwtdNT.d.ts

+/**
+ * ClientEvmSigner - Used by x402 clients to sign payment authorizations.
+ *
+ * Typically a viem WalletClient extended with publicActions:
+ * ```typescript
+ * const client = createWalletClient({
+ *   account: privateKeyToAccount('0x...'),
+ *   chain: baseSepolia,
+ *   transport: http(),
+ * }).extend(publicActions);
+ * ```
+ *
+ * Or composed via `toClientEvmSigner(account, publicClient)`.
+ */
+type ClientEvmSigner = {
+    readonly address: `0x${string}`;
+    signTypedData(message: {
+        domain: Record<string, unknown>;
+        types: Record<string, unknown>;
+        primaryType: string;
+        message: Record<string, unknown>;
+    }): Promise<`0x${string}`>;
+    readContract(args: {
+        address: `0x${string}`;
+        abi: readonly unknown[];
+        functionName: string;
+        args?: readonly unknown[];
+    }): Promise<unknown>;
+};
+/**
+ * FacilitatorEvmSigner - Used by x402 facilitators to verify and settle payments
+ * This is typically a viem PublicClient + WalletClient combination that can
+ * read contract state, verify signatures, write transactions, and wait for receipts
+ *
+ * Supports multiple addresses for load balancing, key rotation, and high availability
+ */
+type FacilitatorEvmSigner = {
+    /**
+     * Get all addresses this facilitator can use for signing
+     * Enables dynamic address selection for load balancing and key rotation
+     */
+    getAddresses(): readonly `0x${string}`[];
+    readContract(args: {
+        address: `0x${string}`;
+        abi: readonly unknown[];
+        functionName: string;
+        args?: readonly unknown[];
+    }): Promise<unknown>;
+    verifyTypedData(args: {
+        address: `0x${string}`;
+        domain: Record<string, unknown>;
+        types: Record<string, unknown>;
+        primaryType: string;
+        message: Record<string, unknown>;
+        signature: `0x${string}`;
+    }): Promise<boolean>;
+    writeContract(args: {
+        address: `0x${string}`;
+        abi: readonly unknown[];
+        functionName: string;
+        args: readonly unknown[];
+    }): Promise<`0x${string}`>;
+    sendTransaction(args: {
+        to: `0x${string}`;
+        data: `0x${string}`;
+    }): Promise<`0x${string}`>;
+    waitForTransactionReceipt(args: {
+        hash: `0x${string}`;
+    }): Promise<{
+        status: string;
+    }>;
+    getCode(args: {
+        address: `0x${string}`;
+    }): Promise<`0x${string}` | undefined>;
+};
+/**
+ * Composes a ClientEvmSigner from a local account and a public client.
+ *
+ * Use this when your signer (e.g., `privateKeyToAccount`) doesn't have
+ * `readContract`. The `publicClient` provides the on-chain read capability.
+ *
+ * Alternatively, use a WalletClient extended with publicActions directly:
+ * ```typescript
+ * const signer = createWalletClient({
+ *   account: privateKeyToAccount('0x...'),
+ *   chain: baseSepolia,
+ *   transport: http(),
+ * }).extend(publicActions);
+ * ```
+ *
+ * @param signer - A signer with `address` and `signTypedData` (and optionally `readContract`)
+ * @param publicClient - A client with `readContract` (required if signer lacks it)
+ * @param publicClient.readContract - The readContract method from the public client
+ * @returns A complete ClientEvmSigner
+ *
+ * @example
+ * ```typescript
+ * const account = privateKeyToAccount("0x...");
+ * const publicClient = createPublicClient({ chain: baseSepolia, transport: http() });
+ * const signer = toClientEvmSigner(account, publicClient);
+ * ```
+ */
+declare function toClientEvmSigner(signer: Omit<ClientEvmSigner, "readContract"> & {
+    readContract?: ClientEvmSigner["readContract"];
+}, publicClient?: {
+    readContract(args: {
+        address: `0x${string}`;
+        abi: readonly unknown[];
+        functionName: string;
+        args?: readonly unknown[];
+    }): Promise<unknown>;
+}): ClientEvmSigner;
+/**
+ * Converts a viem client with single address to a FacilitatorEvmSigner
+ * Wraps the single address in a getAddresses() function for compatibility
+ *
+ * @param client - The client to convert (must have 'address' property)
+ * @returns FacilitatorEvmSigner with getAddresses() support
+ */
+declare function toFacilitatorEvmSigner(client: Omit<FacilitatorEvmSigner, "getAddresses"> & {
+    address: `0x${string}`;
+}): FacilitatorEvmSigner;
+
+export { type ClientEvmSigner as C, type FacilitatorEvmSigner as F, toFacilitatorEvmSigner as a, toClientEvmSigner as t };

dist/esm/chunk-CJHYX7BQ.mjs

+import {
+  ExactEvmSchemeV1,
+  NETWORKS,
+  PERMIT2_ADDRESS,
+  authorizationTypes,
+  createNonce,
+  createPermit2Nonce,
+  eip2612NoncesAbi,
+  eip2612PermitTypes,
+  permit2WitnessTypes,
+  x402ExactPermit2ProxyAddress
+} from "./chunk-GSU4DHTC.mjs";
+
+// src/exact/client/scheme.ts
+import { EIP2612_GAS_SPONSORING } from "@x402/extensions";
+import { getAddress as getAddress4 } from "viem";
+
+// src/exact/client/eip3009.ts
+import { getAddress } from "viem";
+async function createEIP3009Payload(signer, x402Version, paymentRequirements) {
+  const nonce = createNonce();
+  const now = Math.floor(Date.now() / 1e3);
+  const authorization = {
+    from: signer.address,
+    to: getAddress(paymentRequirements.payTo),
+    value: paymentRequirements.amount,
+    validAfter: (now - 600).toString(),
+    validBefore: (now + paymentRequirements.maxTimeoutSeconds).toString(),
+    nonce
+  };
+  const signature = await signEIP3009Authorization(signer, authorization, paymentRequirements);
+  const payload = {
+    authorization,
+    signature
+  };
+  return {
+    x402Version,
+    payload
+  };
+}
+async function signEIP3009Authorization(signer, authorization, requirements) {
+  const chainId = parseInt(requirements.network.split(":")[1]);
+  if (!requirements.extra?.name || !requirements.extra?.version) {
+    throw new Error(
+      `EIP-712 domain parameters (name, version) are required in payment requirements for asset ${requirements.asset}`
+    );
+  }
+  const { name, version } = requirements.extra;
+  const domain = {
+    name,
+    version,
+    chainId,
+    verifyingContract: getAddress(requirements.asset)
+  };
+  const message = {
+    from: getAddress(authorization.from),
+    to: getAddress(authorization.to),
+    value: BigInt(authorization.value),
+    validAfter: BigInt(authorization.validAfter),
+    validBefore: BigInt(authorization.validBefore),
+    nonce: authorization.nonce
+  };
+  return await signer.signTypedData({
+    domain,
+    types: authorizationTypes,
+    primaryType: "TransferWithAuthorization",
+    message
+  });
+}
+
+// src/exact/client/permit2.ts
+import { encodeFunctionData, getAddress as getAddress2 } from "viem";
+var MAX_UINT256 = BigInt("0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff");
+async function createPermit2Payload(signer, x402Version, paymentRequirements) {
+  const now = Math.floor(Date.now() / 1e3);
+  const nonce = createPermit2Nonce();
+  const validAfter = (now - 600).toString();
+  const deadline = (now + paymentRequirements.maxTimeoutSeconds).toString();
+  const permit2Authorization = {
+    from: signer.address,
+    permitted: {
+      token: getAddress2(paymentRequirements.asset),
+      amount: paymentRequirements.amount
+    },
+    spender: x402ExactPermit2ProxyAddress,
+    nonce,
+    deadline,
+    witness: {
+      to: getAddress2(paymentRequirements.payTo),
+      validAfter,
+      extra: "0x"
+    }
+  };
+  const signature = await signPermit2Authorization(
+    signer,
+    permit2Authorization,
+    paymentRequirements
+  );
+  const payload = {
+    signature,
+    permit2Authorization
+  };
+  return {
+    x402Version,
+    payload
+  };
+}
+async function signPermit2Authorization(signer, permit2Authorization, requirements) {
+  const chainId = parseInt(requirements.network.split(":")[1]);
+  const domain = {
+    name: "Permit2",
+    chainId,
+    verifyingContract: PERMIT2_ADDRESS
+  };
+  const message = {
+    permitted: {
+      token: getAddress2(permit2Authorization.permitted.token),
+      amount: BigInt(permit2Authorization.permitted.amount)
+    },
+    spender: getAddress2(permit2Authorization.spender),
+    nonce: BigInt(permit2Authorization.nonce),
+    deadline: BigInt(permit2Authorization.deadline),
+    witness: {
+      to: getAddress2(permit2Authorization.witness.to),
+      validAfter: BigInt(permit2Authorization.witness.validAfter),
+      extra: permit2Authorization.witness.extra
+    }
+  };
+  return await signer.signTypedData({
+    domain,
+    types: permit2WitnessTypes,
+    primaryType: "PermitWitnessTransferFrom",
+    message
+  });
+}
+var erc20ApproveAbi = [
+  {
+    type: "function",
+    name: "approve",
+    inputs: [
+      { name: "spender", type: "address" },
+      { name: "amount", type: "uint256" }
+    ],
+    outputs: [{ type: "bool" }],
+    stateMutability: "nonpayable"
+  }
+];
+var erc20AllowanceAbi = [
+  {
+    type: "function",
+    name: "allowance",
+    inputs: [
+      { name: "owner", type: "address" },
+      { name: "spender", type: "address" }
+    ],
+    outputs: [{ type: "uint256" }],
+    stateMutability: "view"
+  }
+];
+function createPermit2ApprovalTx(tokenAddress) {
+  const data = encodeFunctionData({
+    abi: erc20ApproveAbi,
+    functionName: "approve",
+    args: [PERMIT2_ADDRESS, MAX_UINT256]
+  });
+  return {
+    to: getAddress2(tokenAddress),
+    data
+  };
+}
+function getPermit2AllowanceReadParams(params) {
+  return {
+    address: getAddress2(params.tokenAddress),
+    abi: erc20AllowanceAbi,
+    functionName: "allowance",
+    args: [getAddress2(params.ownerAddress), PERMIT2_ADDRESS]
+  };
+}
+
+// src/exact/client/eip2612.ts
+import { getAddress as getAddress3 } from "viem";
+var MAX_UINT2562 = BigInt("0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff");
+async function signEip2612Permit(signer, tokenAddress, tokenName, tokenVersion, chainId, deadline) {
+  const owner = signer.address;
+  const spender = getAddress3(PERMIT2_ADDRESS);
+  const nonce = await signer.readContract({
+    address: tokenAddress,
+    abi: eip2612NoncesAbi,
+    functionName: "nonces",
+    args: [owner]
+  });
+  const domain = {
+    name: tokenName,
+    version: tokenVersion,
+    chainId,
+    verifyingContract: tokenAddress
+  };
+  const message = {
+    owner,
+    spender,
+    value: MAX_UINT2562,
+    nonce,
+    deadline: BigInt(deadline)
+  };
+  const signature = await signer.signTypedData({
+    domain,
+    types: eip2612PermitTypes,
+    primaryType: "Permit",
+    message
+  });
+  return {
+    from: owner,
+    asset: tokenAddress,
+    spender,
+    amount: MAX_UINT2562.toString(),
+    nonce: nonce.toString(),
+    deadline,
+    signature,
+    version: "1"
+  };
+}
+
+// src/exact/client/scheme.ts
+var erc20AllowanceAbi2 = [
+  {
+    type: "function",
+    name: "allowance",
+    inputs: [
+      { name: "owner", type: "address" },
+      { name: "spender", type: "address" }
+    ],
+    outputs: [{ type: "uint256" }],
+    stateMutability: "view"
+  }
+];
+var ExactEvmScheme = class {
+  /**
+   * Creates a new ExactEvmClient instance.
+   *
+   * @param signer - The EVM signer for client operations.
+   *   Must support `readContract` for EIP-2612 gas sponsoring.
+   *   Use `createWalletClient(...).extend(publicActions)` or `toClientEvmSigner(account, publicClient)`.
+   */
+  constructor(signer) {
+    this.signer = signer;
+    this.scheme = "exact";
+  }
+  /**
+   * Creates a payment payload for the Exact scheme.
+   * Routes to EIP-3009 or Permit2 based on requirements.extra.assetTransferMethod.
+   *
+   * For Permit2 flows, if the server advertises `eip2612GasSponsoring` and the
+   * signer supports `readContract`, automatically signs an EIP-2612 permit
+   * when Permit2 allowance is insufficient.
+   *
+   * @param x402Version - The x402 protocol version
+   * @param paymentRequirements - The payment requirements
+   * @param context - Optional context with server-declared extensions
+   * @returns Promise resolving to a payment payload result (with optional extensions)
+   */
+  async createPaymentPayload(x402Version, paymentRequirements, context) {
+    const assetTransferMethod = paymentRequirements.extra?.assetTransferMethod ?? "eip3009";
+    if (assetTransferMethod === "permit2") {
+      const result = await createPermit2Payload(this.signer, x402Version, paymentRequirements);
+      const eip2612Extensions = await this.trySignEip2612Permit(
+        paymentRequirements,
+        result,
+        context
+      );
+      if (eip2612Extensions) {
+        return {
+          ...result,
+          extensions: eip2612Extensions
+        };
+      }
+      return result;
+    }
+    return createEIP3009Payload(this.signer, x402Version, paymentRequirements);
+  }
+  /**
+   * Attempts to sign an EIP-2612 permit for gasless Permit2 approval.
+   *
+   * Returns extension data if:
+   * 1. Server advertises eip2612GasSponsoring
+   * 2. Signer has readContract capability
+   * 3. Current Permit2 allowance is insufficient
+   *
+   * Returns undefined if the extension should not be used.
+   *
+   * @param requirements - The payment requirements from the server
+   * @param result - The payment payload result from the scheme
+   * @param context - Optional context containing server extensions and metadata
+   * @returns Extension data for EIP-2612 gas sponsoring, or undefined if not applicable
+   */
+  async trySignEip2612Permit(requirements, result, context) {
+    if (!context?.extensions?.[EIP2612_GAS_SPONSORING.key]) {
+      return void 0;
+    }
+    const tokenName = requirements.extra?.name;
+    const tokenVersion = requirements.extra?.version;
+    if (!tokenName || !tokenVersion) {
+      return void 0;
+    }
+    const chainId = parseInt(requirements.network.split(":")[1]);
+    const tokenAddress = getAddress4(requirements.asset);
+    try {
+      const allowance = await this.signer.readContract({
+        address: tokenAddress,
+        abi: erc20AllowanceAbi2,
+        functionName: "allowance",
+        args: [this.signer.address, PERMIT2_ADDRESS]
+      });
+      if (allowance >= BigInt(requirements.amount)) {
+        return void 0;
+      }
+    } catch {
+    }
+    const permit2Auth = result.payload?.permit2Authorization;
+    const deadline = permit2Auth?.deadline ?? Math.floor(Date.now() / 1e3 + requirements.maxTimeoutSeconds).toString();
+    const info = await signEip2612Permit(
+      this.signer,
+      tokenAddress,
+      tokenName,
+      tokenVersion,
+      chainId,
+      deadline
+    );
+    return {
+      [EIP2612_GAS_SPONSORING.key]: { info }
+    };
+  }
+};
+
+// src/exact/client/register.ts
+function registerExactEvmScheme(client, config) {
+  const evmScheme = new ExactEvmScheme(config.signer);
+  if (config.networks && config.networks.length > 0) {
+    config.networks.forEach((network) => {
+      client.register(network, evmScheme);
+    });
+  } else {
+    client.register("eip155:*", evmScheme);
+  }
+  NETWORKS.forEach((network) => {
+    client.registerV1(network, new ExactEvmSchemeV1(config.signer));
+  });
+  if (config.policies) {
+    config.policies.forEach((policy) => {
+      client.registerPolicy(policy);
+    });
+  }
+  return client;
+}
+
+export {
+  erc20AllowanceAbi,
+  createPermit2ApprovalTx,
+  getPermit2AllowanceReadParams,
+  ExactEvmScheme,
+  registerExactEvmScheme
+};
+//# sourceMappingURL=chunk-CJHYX7BQ.mjs.map

dist/esm/chunk-CJHYX7BQ.mjs.map

+{"version":3,"sources":["../../src/exact/client/scheme.ts","../../src/exact/client/eip3009.ts","../../src/exact/client/permit2.ts","../../src/exact/client/eip2612.ts","../../src/exact/client/register.ts"],"sourcesContent":["import {\n  PaymentRequirements,\n  SchemeNetworkClient,\n  PaymentPayloadResult,\n  PaymentPayloadContext,\n} from \"@x402/core/types\";\nimport { EIP2612_GAS_SPONSORING } from \"@x402/extensions\";\nimport { ClientEvmSigner } from \"../../signer\";\nimport { AssetTransferMethod } from \"../../types\";\nimport { PERMIT2_ADDRESS } from \"../../constants\";\nimport { getAddress } from \"viem\";\nimport { createEIP3009Payload } from \"./eip3009\";\nimport { createPermit2Payload } from \"./permit2\";\nimport { signEip2612Permit } from \"./eip2612\";\n\n/** ERC20 allowance ABI for checking Permit2 approval */\nconst erc20AllowanceAbi = [\n  {\n    type: \"function\",\n    name: \"allowance\",\n    inputs: [\n      { name: \"owner\", type: \"address\" },\n      { name: \"spender\", type: \"address\" },\n    ],\n    outputs: [{ type: \"uint256\" }],\n    stateMutability: \"view\",\n  },\n] as const;\n\n/**\n * EVM client implementation for the Exact payment scheme.\n * Supports both EIP-3009 (transferWithAuthorization) and Permit2 flows.\n *\n * Routes to the appropriate authorization method based on\n * `requirements.extra.assetTransferMethod`. Defaults to EIP-3009\n * for backward compatibility with older facilitators.\n *\n * When the server advertises `eip2612GasSponsoring` and the asset transfer\n * method is `permit2`, the scheme automatically signs an EIP-2612 permit\n * if the user lacks Permit2 approval. This requires `readContract` on the signer.\n */\nexport class ExactEvmScheme implements SchemeNetworkClient {\n  readonly scheme = \"exact\";\n\n  /**\n   * Creates a new ExactEvmClient instance.\n   *\n   * @param signer - The EVM signer for client operations.\n   *   Must support `readContract` for EIP-2612 gas sponsoring.\n   *   Use `createWalletClient(...).extend(publicActions)` or `toClientEvmSigner(account, publicClient)`.\n   */\n  constructor(private readonly signer: ClientEvmSigner) {}\n\n  /**\n   * Creates a payment payload for the Exact scheme.\n   * Routes to EIP-3009 or Permit2 based on requirements.extra.assetTransferMethod.\n   *\n   * For Permit2 flows, if the server advertises `eip2612GasSponsoring` and the\n   * signer supports `readContract`, automatically signs an EIP-2612 permit\n   * when Permit2 allowance is insufficient.\n   *\n   * @param x402Version - The x402 protocol version\n   * @param paymentRequirements - The payment requirements\n   * @param context - Optional context with server-declared extensions\n   * @returns Promise resolving to a payment payload result (with optional extensions)\n   */\n  async createPaymentPayload(\n    x402Version: number,\n    paymentRequirements: PaymentRequirements,\n    context?: PaymentPayloadContext,\n  ): Promise<PaymentPayloadResult> {\n    const assetTransferMethod =\n      (paymentRequirements.extra?.assetTransferMethod as AssetTransferMethod) ?? \"eip3009\";\n\n    if (assetTransferMethod === \"permit2\") {\n      const result = await createPermit2Payload(this.signer, x402Version, paymentRequirements);\n\n      // Check if EIP-2612 gas sponsoring is advertised and we can handle it\n      const eip2612Extensions = await this.trySignEip2612Permit(\n        paymentRequirements,\n        result,\n        context,\n      );\n\n      if (eip2612Extensions) {\n        return {\n          ...result,\n          extensions: eip2612Extensions,\n        };\n      }\n\n      return result;\n    }\n\n    return createEIP3009Payload(this.signer, x402Version, paymentRequirements);\n  }\n\n  /**\n   * Attempts to sign an EIP-2612 permit for gasless Permit2 approval.\n   *\n   * Returns extension data if:\n   * 1. Server advertises eip2612GasSponsoring\n   * 2. Signer has readContract capability\n   * 3. Current Permit2 allowance is insufficient\n   *\n   * Returns undefined if the extension should not be used.\n   *\n   * @param requirements - The payment requirements from the server\n   * @param result - The payment payload result from the scheme\n   * @param context - Optional context containing server extensions and metadata\n   * @returns Extension data for EIP-2612 gas sponsoring, or undefined if not applicable\n   */\n  private async trySignEip2612Permit(\n    requirements: PaymentRequirements,\n    result: PaymentPayloadResult,\n    context?: PaymentPayloadContext,\n  ): Promise<Record<string, unknown> | undefined> {\n    // Check if server advertises eip2612GasSponsoring\n    if (!context?.extensions?.[EIP2612_GAS_SPONSORING.key]) {\n      return undefined;\n    }\n\n    // Check that required token metadata is available\n    const tokenName = requirements.extra?.name as string | undefined;\n    const tokenVersion = requirements.extra?.version as string | undefined;\n    if (!tokenName || !tokenVersion) {\n      return undefined;\n    }\n\n    const chainId = parseInt(requirements.network.split(\":\")[1]);\n    const tokenAddress = getAddress(requirements.asset) as `0x${string}`;\n\n    // Check if user already has sufficient Permit2 allowance\n    try {\n      const allowance = (await this.signer.readContract({\n        address: tokenAddress,\n        abi: erc20AllowanceAbi,\n        functionName: \"allowance\",\n        args: [this.signer.address, PERMIT2_ADDRESS],\n      })) as bigint;\n\n      if (allowance >= BigInt(requirements.amount)) {\n        return undefined; // Already approved, no need for EIP-2612\n      }\n    } catch {\n      // If we can't check allowance, proceed with EIP-2612 signing\n    }\n\n    // Use the same deadline as the Permit2 authorization\n    const permit2Auth = result.payload?.permit2Authorization as Record<string, unknown> | undefined;\n    const deadline =\n      (permit2Auth?.deadline as string) ??\n      Math.floor(Date.now() / 1000 + requirements.maxTimeoutSeconds).toString();\n\n    // Sign the EIP-2612 permit\n    const info = await signEip2612Permit(\n      this.signer,\n      tokenAddress,\n      tokenName,\n      tokenVersion,\n      chainId,\n      deadline,\n    );\n\n    return {\n      [EIP2612_GAS_SPONSORING.key]: { info },\n    };\n  }\n}\n","import { PaymentRequirements, PaymentPayloadResult } from \"@x402/core/types\";\nimport { getAddress } from \"viem\";\nimport { authorizationTypes } from \"../../constants\";\nimport { ClientEvmSigner } from \"../../signer\";\nimport { ExactEIP3009Payload } from \"../../types\";\nimport { createNonce } from \"../../utils\";\n\n/**\n * Creates an EIP-3009 (transferWithAuthorization) payload.\n *\n * @param signer - The EVM signer for client operations\n * @param x402Version - The x402 protocol version\n * @param paymentRequirements - The payment requirements\n * @returns Promise resolving to a payment payload result\n */\nexport async function createEIP3009Payload(\n  signer: ClientEvmSigner,\n  x402Version: number,\n  paymentRequirements: PaymentRequirements,\n): Promise<PaymentPayloadResult> {\n  const nonce = createNonce();\n  const now = Math.floor(Date.now() / 1000);\n\n  const authorization: ExactEIP3009Payload[\"authorization\"] = {\n    from: signer.address,\n    to: getAddress(paymentRequirements.payTo),\n    value: paymentRequirements.amount,\n    validAfter: (now - 600).toString(),\n    validBefore: (now + paymentRequirements.maxTimeoutSeconds).toString(),\n    nonce,\n  };\n\n  const signature = await signEIP3009Authorization(signer, authorization, paymentRequirements);\n\n  const payload: ExactEIP3009Payload = {\n    authorization,\n    signature,\n  };\n\n  return {\n    x402Version,\n    payload,\n  };\n}\n\n/**\n * Sign the EIP-3009 authorization using EIP-712.\n *\n * @param signer - The EVM signer\n * @param authorization - The authorization to sign\n * @param requirements - The payment requirements\n * @returns Promise resolving to the signature\n */\nasync function signEIP3009Authorization(\n  signer: ClientEvmSigner,\n  authorization: ExactEIP3009Payload[\"authorization\"],\n  requirements: PaymentRequirements,\n): Promise<`0x${string}`> {\n  const chainId = parseInt(requirements.network.split(\":\")[1]);\n\n  if (!requirements.extra?.name || !requirements.extra?.version) {\n    throw new Error(\n      `EIP-712 domain parameters (name, version) are required in payment requirements for asset ${requirements.asset}`,\n    );\n  }\n\n  const { name, version } = requirements.extra;\n\n  const domain = {\n    name,\n    version,\n    chainId,\n    verifyingContract: getAddress(requirements.asset),\n  };\n\n  const message = {\n    from: getAddress(authorization.from),\n    to: getAddress(authorization.to),\n    value: BigInt(authorization.value),\n    validAfter: BigInt(authorization.validAfter),\n    validBefore: BigInt(authorization.validBefore),\n    nonce: authorization.nonce,\n  };\n\n  return await signer.signTypedData({\n    domain,\n    types: authorizationTypes,\n    primaryType: \"TransferWithAuthorization\",\n    message,\n  });\n}\n","import { PaymentRequirements, PaymentPayloadResult } from \"@x402/core/types\";\nimport { encodeFunctionData, getAddress } from \"viem\";\nimport {\n  permit2WitnessTypes,\n  PERMIT2_ADDRESS,\n  x402ExactPermit2ProxyAddress,\n} from \"../../constants\";\nimport { ClientEvmSigner } from \"../../signer\";\nimport { ExactPermit2Payload } from \"../../types\";\nimport { createPermit2Nonce } from \"../../utils\";\n\n/** Maximum uint256 value for unlimited approval. */\nconst MAX_UINT256 = BigInt(\"0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff\");\n\n/**\n * Creates a Permit2 payload using the x402Permit2Proxy witness pattern.\n * The spender is set to x402Permit2Proxy, which enforces that funds\n * can only be sent to the witness.to address.\n *\n * @param signer - The EVM signer for client operations\n * @param x402Version - The x402 protocol version\n * @param paymentRequirements - The payment requirements\n * @returns Promise resolving to a payment payload result\n */\nexport async function createPermit2Payload(\n  signer: ClientEvmSigner,\n  x402Version: number,\n  paymentRequirements: PaymentRequirements,\n): Promise<PaymentPayloadResult> {\n  const now = Math.floor(Date.now() / 1000);\n  const nonce = createPermit2Nonce();\n\n  // Lower time bound - allow some clock skew\n  const validAfter = (now - 600).toString();\n  // Upper time bound is enforced by Permit2's deadline field\n  const deadline = (now + paymentRequirements.maxTimeoutSeconds).toString();\n\n  const permit2Authorization: ExactPermit2Payload[\"permit2Authorization\"] = {\n    from: signer.address,\n    permitted: {\n      token: getAddress(paymentRequirements.asset),\n      amount: paymentRequirements.amount,\n    },\n    spender: x402ExactPermit2ProxyAddress,\n    nonce,\n    deadline,\n    witness: {\n      to: getAddress(paymentRequirements.payTo),\n      validAfter,\n      extra: \"0x\",\n    },\n  };\n\n  const signature = await signPermit2Authorization(\n    signer,\n    permit2Authorization,\n    paymentRequirements,\n  );\n\n  const payload: ExactPermit2Payload = {\n    signature,\n    permit2Authorization,\n  };\n\n  return {\n    x402Version,\n    payload,\n  };\n}\n\n/**\n * Sign the Permit2 authorization using EIP-712 with witness data.\n * The signature authorizes the x402Permit2Proxy to transfer tokens on behalf of the signer.\n *\n * @param signer - The EVM signer\n * @param permit2Authorization - The Permit2 authorization parameters\n * @param requirements - The payment requirements\n * @returns Promise resolving to the signature\n */\nasync function signPermit2Authorization(\n  signer: ClientEvmSigner,\n  permit2Authorization: ExactPermit2Payload[\"permit2Authorization\"],\n  requirements: PaymentRequirements,\n): Promise<`0x${string}`> {\n  const chainId = parseInt(requirements.network.split(\":\")[1]);\n\n  const domain = {\n    name: \"Permit2\",\n    chainId,\n    verifyingContract: PERMIT2_ADDRESS,\n  };\n\n  const message = {\n    permitted: {\n      token: getAddress(permit2Authorization.permitted.token),\n      amount: BigInt(permit2Authorization.permitted.amount),\n    },\n    spender: getAddress(permit2Authorization.spender),\n    nonce: BigInt(permit2Authorization.nonce),\n    deadline: BigInt(permit2Authorization.deadline),\n    witness: {\n      to: getAddress(permit2Authorization.witness.to),\n      validAfter: BigInt(permit2Authorization.witness.validAfter),\n      extra: permit2Authorization.witness.extra,\n    },\n  };\n\n  return await signer.signTypedData({\n    domain,\n    types: permit2WitnessTypes,\n    primaryType: \"PermitWitnessTransferFrom\",\n    message,\n  });\n}\n\n/**\n * ERC20 approve ABI for encoding approval transactions.\n */\nconst erc20ApproveAbi = [\n  {\n    type: \"function\",\n    name: \"approve\",\n    inputs: [\n      { name: \"spender\", type: \"address\" },\n      { name: \"amount\", type: \"uint256\" },\n    ],\n    outputs: [{ type: \"bool\" }],\n    stateMutability: \"nonpayable\",\n  },\n] as const;\n\n/**\n * ERC20 allowance ABI for checking approval status.\n */\nexport const erc20AllowanceAbi = [\n  {\n    type: \"function\",\n    name: \"allowance\",\n    inputs: [\n      { name: \"owner\", type: \"address\" },\n      { name: \"spender\", type: \"address\" },\n    ],\n    outputs: [{ type: \"uint256\" }],\n    stateMutability: \"view\",\n  },\n] as const;\n\n/**\n * Creates transaction data to approve Permit2 to spend tokens.\n * The user sends this transaction (paying gas) before using Permit2 flow.\n *\n * @param tokenAddress - The ERC20 token contract address\n * @returns Transaction data to send for approval\n *\n * @example\n * ```typescript\n * const tx = createPermit2ApprovalTx(\"0x...\");\n * await walletClient.sendTransaction({\n *   to: tx.to,\n *   data: tx.data,\n * });\n * ```\n */\nexport function createPermit2ApprovalTx(tokenAddress: `0x${string}`): {\n  to: `0x${string}`;\n  data: `0x${string}`;\n} {\n  const data = encodeFunctionData({\n    abi: erc20ApproveAbi,\n    functionName: \"approve\",\n    args: [PERMIT2_ADDRESS, MAX_UINT256],\n  });\n\n  return {\n    to: getAddress(tokenAddress),\n    data,\n  };\n}\n\n/**\n * Parameters for checking Permit2 allowance.\n * Application provides these to check if approval is needed.\n */\nexport interface Permit2AllowanceParams {\n  tokenAddress: `0x${string}`;\n  ownerAddress: `0x${string}`;\n}\n\n/**\n * Returns contract read parameters for checking Permit2 allowance.\n * Use with a public client to check if the user has approved Permit2.\n *\n * @param params - The allowance check parameters\n * @returns Contract read parameters for checking allowance\n *\n * @example\n * ```typescript\n * const readParams = getPermit2AllowanceReadParams({\n *   tokenAddress: \"0x...\",\n *   ownerAddress: \"0x...\",\n * });\n *\n * const allowance = await publicClient.readContract(readParams);\n * const needsApproval = allowance < requiredAmount;\n * ```\n */\nexport function getPermit2AllowanceReadParams(params: Permit2AllowanceParams): {\n  address: `0x${string}`;\n  abi: typeof erc20AllowanceAbi;\n  functionName: \"allowance\";\n  args: [`0x${string}`, `0x${string}`];\n} {\n  return {\n    address: getAddress(params.tokenAddress),\n    abi: erc20AllowanceAbi,\n    functionName: \"allowance\",\n    args: [getAddress(params.ownerAddress), PERMIT2_ADDRESS],\n  };\n}\n","import { getAddress } from \"viem\";\nimport type { Eip2612GasSponsoringInfo } from \"@x402/extensions\";\nimport { eip2612PermitTypes, eip2612NoncesAbi, PERMIT2_ADDRESS } from \"../../constants\";\nimport { ClientEvmSigner } from \"../../signer\";\n\n/** Maximum uint256 value for unlimited approval. */\nconst MAX_UINT256 = BigInt(\"0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff\");\n\n/**\n * Signs an EIP-2612 permit authorizing the Permit2 contract to spend tokens.\n *\n * This creates a gasless off-chain signature that the facilitator can submit\n * on-chain via `x402Permit2Proxy.settleWithPermit()`.\n *\n * @param signer - The client EVM signer (must support readContract for nonce query)\n * @param tokenAddress - The ERC-20 token contract address\n * @param tokenName - The token name (from paymentRequirements.extra.name)\n * @param tokenVersion - The token version (from paymentRequirements.extra.version)\n * @param chainId - The chain ID\n * @param deadline - The deadline for the permit (unix timestamp as string)\n * @returns The EIP-2612 gas sponsoring info object\n */\nexport async function signEip2612Permit(\n  signer: ClientEvmSigner,\n  tokenAddress: `0x${string}`,\n  tokenName: string,\n  tokenVersion: string,\n  chainId: number,\n  deadline: string,\n): Promise<Eip2612GasSponsoringInfo> {\n  const owner = signer.address;\n  const spender = getAddress(PERMIT2_ADDRESS);\n\n  // Query the current EIP-2612 nonce from the token contract\n  const nonce = (await signer.readContract({\n    address: tokenAddress,\n    abi: eip2612NoncesAbi,\n    functionName: \"nonces\",\n    args: [owner],\n  })) as bigint;\n\n  // Construct EIP-712 domain for the token's permit function\n  const domain = {\n    name: tokenName,\n    version: tokenVersion,\n    chainId,\n    verifyingContract: tokenAddress,\n  };\n\n  const message = {\n    owner,\n    spender,\n    value: MAX_UINT256,\n    nonce,\n    deadline: BigInt(deadline),\n  };\n\n  // Sign the EIP-2612 permit\n  const signature = await signer.signTypedData({\n    domain,\n    types: eip2612PermitTypes,\n    primaryType: \"Permit\",\n    message,\n  });\n\n  return {\n    from: owner,\n    asset: tokenAddress,\n    spender,\n    amount: MAX_UINT256.toString(),\n    nonce: nonce.toString(),\n    deadline,\n    signature,\n    version: \"1\",\n  };\n}\n","import { x402Client, SelectPaymentRequirements, PaymentPolicy } from \"@x402/core/client\";\nimport { Network } from \"@x402/core/types\";\nimport { ClientEvmSigner } from \"../../signer\";\nimport { ExactEvmScheme } from \"./scheme\";\nimport { ExactEvmSchemeV1 } from \"../v1/client/scheme\";\nimport { NETWORKS } from \"../../v1\";\n\n/**\n * Configuration options for registering EVM schemes to an x402Client\n */\nexport interface EvmClientConfig {\n  /**\n   * The EVM signer to use for creating payment payloads\n   */\n  signer: ClientEvmSigner;\n\n  /**\n   * Optional payment requirements selector function\n   * If not provided, uses the default selector (first available option)\n   */\n  paymentRequirementsSelector?: SelectPaymentRequirements;\n\n  /**\n   * Optional policies to apply to the client\n   */\n  policies?: PaymentPolicy[];\n\n  /**\n   * Optional specific networks to register\n   * If not provided, registers wildcard support (eip155:*)\n   */\n  networks?: Network[];\n}\n\n/**\n * Registers EVM exact payment schemes to an x402Client instance.\n *\n * This function registers:\n * - V2: eip155:* wildcard scheme with ExactEvmScheme (or specific networks if provided)\n * - V1: All supported EVM networks with ExactEvmSchemeV1\n *\n * @param client - The x402Client instance to register schemes to\n * @param config - Configuration for EVM client registration\n * @returns The client instance for chaining\n *\n * @example\n * ```typescript\n * import { registerExactEvmScheme } from \"@x402/evm/exact/client/register\";\n * import { x402Client } from \"@x402/core/client\";\n * import { privateKeyToAccount } from \"viem/accounts\";\n *\n * const account = privateKeyToAccount(\"0x...\");\n * const client = new x402Client();\n * registerExactEvmScheme(client, { signer: account });\n * ```\n */\nexport function registerExactEvmScheme(client: x402Client, config: EvmClientConfig): x402Client {\n  const evmScheme = new ExactEvmScheme(config.signer);\n\n  // Register V2 scheme\n  // EIP-2612 gas sponsoring is handled internally by the scheme when the\n  // server advertises support - no separate extension registration needed.\n  if (config.networks && config.networks.length > 0) {\n    // Register specific networks\n    config.networks.forEach(network => {\n      client.register(network, evmScheme);\n    });\n  } else {\n    // Register wildcard for all EVM chains\n    client.register(\"eip155:*\", evmScheme);\n  }\n\n  // Register all V1 networks\n  NETWORKS.forEach(network => {\n    client.registerV1(network as Network, new ExactEvmSchemeV1(config.signer));\n  });\n\n  // Apply policies if provided\n  if (config.policies) {\n    config.policies.forEach(policy => {\n      client.registerPolicy(policy);\n    });\n  }\n\n  return 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dist/esm/chunk-GSU4DHTC.mjs

+// src/exact/v1/client/scheme.ts
+import { getAddress } from "viem";
+
+// src/constants.ts
+var authorizationTypes = {
+  TransferWithAuthorization: [
+    { name: "from", type: "address" },
+    { name: "to", type: "address" },
+    { name: "value", type: "uint256" },
+    { name: "validAfter", type: "uint256" },
+    { name: "validBefore", type: "uint256" },
+    { name: "nonce", type: "bytes32" }
+  ]
+};
+var permit2WitnessTypes = {
+  PermitWitnessTransferFrom: [
+    { name: "permitted", type: "TokenPermissions" },
+    { name: "spender", type: "address" },
+    { name: "nonce", type: "uint256" },
+    { name: "deadline", type: "uint256" },
+    { name: "witness", type: "Witness" }
+  ],
+  TokenPermissions: [
+    { name: "token", type: "address" },
+    { name: "amount", type: "uint256" }
+  ],
+  Witness: [
+    { name: "to", type: "address" },
+    { name: "validAfter", type: "uint256" },
+    { name: "extra", type: "bytes" }
+  ]
+};
+var eip3009ABI = [
+  {
+    inputs: [
+      { name: "from", type: "address" },
+      { name: "to", type: "address" },
+      { name: "value", type: "uint256" },
+      { name: "validAfter", type: "uint256" },
+      { name: "validBefore", type: "uint256" },
+      { name: "nonce", type: "bytes32" },
+      { name: "v", type: "uint8" },
+      { name: "r", type: "bytes32" },
+      { name: "s", type: "bytes32" }
+    ],
+    name: "transferWithAuthorization",
+    outputs: [],
+    stateMutability: "nonpayable",
+    type: "function"
+  },
+  {
+    inputs: [
+      { name: "from", type: "address" },
+      { name: "to", type: "address" },
+      { name: "value", type: "uint256" },
+      { name: "validAfter", type: "uint256" },
+      { name: "validBefore", type: "uint256" },
+      { name: "nonce", type: "bytes32" },
+      { name: "signature", type: "bytes" }
+    ],
+    name: "transferWithAuthorization",
+    outputs: [],
+    stateMutability: "nonpayable",
+    type: "function"
+  },
+  {
+    inputs: [{ name: "account", type: "address" }],
+    name: "balanceOf",
+    outputs: [{ name: "", type: "uint256" }],
+    stateMutability: "view",
+    type: "function"
+  },
+  {
+    inputs: [],
+    name: "version",
+    outputs: [{ name: "", type: "string" }],
+    stateMutability: "view",
+    type: "function"
+  }
+];
+var eip2612PermitTypes = {
+  Permit: [
+    { name: "owner", type: "address" },
+    { name: "spender", type: "address" },
+    { name: "value", type: "uint256" },
+    { name: "nonce", type: "uint256" },
+    { name: "deadline", type: "uint256" }
+  ]
+};
+var eip2612NoncesAbi = [
+  {
+    type: "function",
+    name: "nonces",
+    inputs: [{ name: "owner", type: "address" }],
+    outputs: [{ type: "uint256" }],
+    stateMutability: "view"
+  }
+];
+var PERMIT2_ADDRESS = "0x000000000022D473030F116dDEE9F6B43aC78BA3";
+var x402ExactPermit2ProxyAddress = "0x4020615294c913F045dc10f0a5cdEbd86c280001";
+var x402UptoPermit2ProxyAddress = "0x4020633461b2895a48930Ff97eE8fCdE8E520002";
+var x402ExactPermit2ProxyABI = [
+  {
+    type: "function",
+    name: "PERMIT2",
+    inputs: [],
+    outputs: [{ name: "", type: "address", internalType: "contract ISignatureTransfer" }],
+    stateMutability: "view"
+  },
+  {
+    type: "function",
+    name: "WITNESS_TYPEHASH",
+    inputs: [],
+    outputs: [{ name: "", type: "bytes32", internalType: "bytes32" }],
+    stateMutability: "view"
+  },
+  {
+    type: "function",
+    name: "WITNESS_TYPE_STRING",
+    inputs: [],
+    outputs: [{ name: "", type: "string", internalType: "string" }],
+    stateMutability: "view"
+  },
+  {
+    type: "function",
+    name: "initialize",
+    inputs: [{ name: "_permit2", type: "address", internalType: "address" }],
+    outputs: [],
+    stateMutability: "nonpayable"
+  },
+  {
+    type: "function",
+    name: "settle",
+    inputs: [
+      {
+        name: "permit",
+        type: "tuple",
+        internalType: "struct ISignatureTransfer.PermitTransferFrom",
+        components: [
+          {
+            name: "permitted",
+            type: "tuple",
+            internalType: "struct ISignatureTransfer.TokenPermissions",
+            components: [
+              { name: "token", type: "address", internalType: "address" },
+              { name: "amount", type: "uint256", internalType: "uint256" }
+            ]
+          },
+          { name: "nonce", type: "uint256", internalType: "uint256" },
+          { name: "deadline", type: "uint256", internalType: "uint256" }
+        ]
+      },
+      { name: "owner", type: "address", internalType: "address" },
+      {
+        name: "witness",
+        type: "tuple",
+        internalType: "struct x402BasePermit2Proxy.Witness",
+        components: [
+          { name: "to", type: "address", internalType: "address" },
+          { name: "validAfter", type: "uint256", internalType: "uint256" },
+          { name: "extra", type: "bytes", internalType: "bytes" }
+        ]
+      },
+      { name: "signature", type: "bytes", internalType: "bytes" }
+    ],
+    outputs: [],
+    stateMutability: "nonpayable"
+  },
+  {
+    type: "function",
+    name: "settleWithPermit",
+    inputs: [
+      {
+        name: "permit2612",
+        type: "tuple",
+        internalType: "struct x402BasePermit2Proxy.EIP2612Permit",
+        components: [
+          { name: "value", type: "uint256", internalType: "uint256" },
+          { name: "deadline", type: "uint256", internalType: "uint256" },
+          { name: "r", type: "bytes32", internalType: "bytes32" },
+          { name: "s", type: "bytes32", internalType: "bytes32" },
+          { name: "v", type: "uint8", internalType: "uint8" }
+        ]
+      },
+      {
+        name: "permit",
+        type: "tuple",
+        internalType: "struct ISignatureTransfer.PermitTransferFrom",
+        components: [
+          {
+            name: "permitted",
+            type: "tuple",
+            internalType: "struct ISignatureTransfer.TokenPermissions",
+            components: [
+              { name: "token", type: "address", internalType: "address" },
+              { name: "amount", type: "uint256", internalType: "uint256" }
+            ]
+          },
+          { name: "nonce", type: "uint256", internalType: "uint256" },
+          { name: "deadline", type: "uint256", internalType: "uint256" }
+        ]
+      },
+      { name: "owner", type: "address", internalType: "address" },
+      {
+        name: "witness",
+        type: "tuple",
+        internalType: "struct x402BasePermit2Proxy.Witness",
+        components: [
+          { name: "to", type: "address", internalType: "address" },
+          { name: "validAfter", type: "uint256", internalType: "uint256" },
+          { name: "extra", type: "bytes", internalType: "bytes" }
+        ]
+      },
+      { name: "signature", type: "bytes", internalType: "bytes" }
+    ],
+    outputs: [],
+    stateMutability: "nonpayable"
+  },
+  { type: "event", name: "Settled", inputs: [], anonymous: false },
+  { type: "event", name: "SettledWithPermit", inputs: [], anonymous: false },
+  { type: "error", name: "AlreadyInitialized", inputs: [] },
+  { type: "error", name: "InvalidDestination", inputs: [] },
+  { type: "error", name: "InvalidOwner", inputs: [] },
+  { type: "error", name: "InvalidPermit2Address", inputs: [] },
+  { type: "error", name: "PaymentTooEarly", inputs: [] },
+  { type: "error", name: "ReentrancyGuardReentrantCall", inputs: [] }
+];
+
+// src/utils.ts
+import { toHex } from "viem";
+function getEvmChainId(network) {
+  const chainId = EVM_NETWORK_CHAIN_ID_MAP[network];
+  if (!chainId) {
+    throw new Error(`Unsupported network: ${network}`);
+  }
+  return chainId;
+}
+function getCrypto() {
+  const cryptoObj = globalThis.crypto;
+  if (!cryptoObj) {
+    throw new Error("Crypto API not available");
+  }
+  return cryptoObj;
+}
+function createNonce() {
+  return toHex(getCrypto().getRandomValues(new Uint8Array(32)));
+}
+function createPermit2Nonce() {
+  const randomBytes = getCrypto().getRandomValues(new Uint8Array(32));
+  return BigInt(toHex(randomBytes)).toString();
+}
+
+// src/exact/v1/client/scheme.ts
+var ExactEvmSchemeV1 = class {
+  /**
+   * Creates a new ExactEvmClientV1 instance.
+   *
+   * @param signer - The EVM signer for client operations
+   */
+  constructor(signer) {
+    this.signer = signer;
+    this.scheme = "exact";
+  }
+  /**
+   * Creates a payment payload for the Exact scheme (V1).
+   *
+   * @param x402Version - The x402 protocol version
+   * @param paymentRequirements - The payment requirements
+   * @returns Promise resolving to a payment payload
+   */
+  async createPaymentPayload(x402Version, paymentRequirements) {
+    const selectedV1 = paymentRequirements;
+    const nonce = createNonce();
+    const now = Math.floor(Date.now() / 1e3);
+    const authorization = {
+      from: this.signer.address,
+      to: getAddress(selectedV1.payTo),
+      value: selectedV1.maxAmountRequired,
+      validAfter: (now - 600).toString(),
+      // 10 minutes before
+      validBefore: (now + selectedV1.maxTimeoutSeconds).toString(),
+      nonce
+    };
+    const signature = await this.signAuthorization(authorization, selectedV1);
+    const payload = {
+      authorization,
+      signature
+    };
+    return {
+      x402Version,
+      scheme: selectedV1.scheme,
+      network: selectedV1.network,
+      payload
+    };
+  }
+  /**
+   * Sign the EIP-3009 authorization using EIP-712
+   *
+   * @param authorization - The authorization to sign
+   * @param requirements - The payment requirements
+   * @returns Promise resolving to the signature
+   */
+  async signAuthorization(authorization, requirements) {
+    const chainId = getEvmChainId(requirements.network);
+    if (!requirements.extra?.name || !requirements.extra?.version) {
+      throw new Error(
+        `EIP-712 domain parameters (name, version) are required in payment requirements for asset ${requirements.asset}`
+      );
+    }
+    const { name, version } = requirements.extra;
+    const domain = {
+      name,
+      version,
+      chainId,
+      verifyingContract: getAddress(requirements.asset)
+    };
+    const message = {
+      from: getAddress(authorization.from),
+      to: getAddress(authorization.to),
+      value: BigInt(authorization.value),
+      validAfter: BigInt(authorization.validAfter),
+      validBefore: BigInt(authorization.validBefore),
+      nonce: authorization.nonce
+    };
+    return await this.signer.signTypedData({
+      domain,
+      types: authorizationTypes,
+      primaryType: "TransferWithAuthorization",
+      message
+    });
+  }
+};
+
+// src/exact/v1/facilitator/scheme.ts
+import { getAddress as getAddress2, isAddressEqual, parseErc6492Signature, parseSignature } from "viem";
+var ExactEvmSchemeV12 = class {
+  /**
+   * Creates a new ExactEvmFacilitatorV1 instance.
+   *
+   * @param signer - The EVM signer for facilitator operations
+   * @param config - Optional configuration for the facilitator
+   */
+  constructor(signer, config) {
+    this.signer = signer;
+    this.scheme = "exact";
+    this.caipFamily = "eip155:*";
+    this.config = {
+      deployERC4337WithEIP6492: config?.deployERC4337WithEIP6492 ?? false
+    };
+  }
+  /**
+   * Get mechanism-specific extra data for the supported kinds endpoint.
+   * For EVM, no extra data is needed.
+   *
+   * @param _ - The network identifier (unused for EVM)
+   * @returns undefined (EVM has no extra data)
+   */
+  getExtra(_) {
+    return void 0;
+  }
+  /**
+   * Get signer addresses used by this facilitator.
+   * Returns all addresses this facilitator can use for signing/settling transactions.
+   *
+   * @param _ - The network identifier (unused for EVM, addresses are network-agnostic)
+   * @returns Array of facilitator wallet addresses
+   */
+  getSigners(_) {
+    return [...this.signer.getAddresses()];
+  }
+  /**
+   * Verifies a payment payload (V1).
+   *
+   * @param payload - The payment payload to verify
+   * @param requirements - The payment requirements
+   * @returns Promise resolving to verification response
+   */
+  async verify(payload, requirements) {
+    const requirementsV1 = requirements;
+    const payloadV1 = payload;
+    const exactEvmPayload = payload.payload;
+    if (payloadV1.scheme !== "exact" || requirements.scheme !== "exact") {
+      return {
+        isValid: false,
+        invalidReason: "unsupported_scheme",
+        payer: exactEvmPayload.authorization.from
+      };
+    }
+    let chainId;
+    try {
+      chainId = getEvmChainId(payloadV1.network);
+    } catch {
+      return {
+        isValid: false,
+        invalidReason: `invalid_network`,
+        payer: exactEvmPayload.authorization.from
+      };
+    }
+    if (!requirements.extra?.name || !requirements.extra?.version) {
+      return {
+        isValid: false,
+        invalidReason: "missing_eip712_domain",
+        payer: exactEvmPayload.authorization.from
+      };
+    }
+    const { name, version } = requirements.extra;
+    const erc20Address = getAddress2(requirements.asset);
+    if (payloadV1.network !== requirements.network) {
+      return {
+        isValid: false,
+        invalidReason: "network_mismatch",
+        payer: exactEvmPayload.authorization.from
+      };
+    }
+    const permitTypedData = {
+      types: authorizationTypes,
+      primaryType: "TransferWithAuthorization",
+      domain: {
+        name,
+        version,
+        chainId,
+        verifyingContract: erc20Address
+      },
+      message: {
+        from: exactEvmPayload.authorization.from,
+        to: exactEvmPayload.authorization.to,
+        value: BigInt(exactEvmPayload.authorization.value),
+        validAfter: BigInt(exactEvmPayload.authorization.validAfter),
+        validBefore: BigInt(exactEvmPayload.authorization.validBefore),
+        nonce: exactEvmPayload.authorization.nonce
+      }
+    };
+    try {
+      const recoveredAddress = await this.signer.verifyTypedData({
+        address: exactEvmPayload.authorization.from,
+        ...permitTypedData,
+        signature: exactEvmPayload.signature
+      });
+      if (!recoveredAddress) {
+        return {
+          isValid: false,
+          invalidReason: "invalid_exact_evm_payload_signature",
+          payer: exactEvmPayload.authorization.from
+        };
+      }
+    } catch {
+      const signature = exactEvmPayload.signature;
+      const signatureLength = signature.startsWith("0x") ? signature.length - 2 : signature.length;
+      const isSmartWallet = signatureLength > 130;
+      if (isSmartWallet) {
+        const payerAddress = exactEvmPayload.authorization.from;
+        const bytecode = await this.signer.getCode({ address: payerAddress });
+        if (!bytecode || bytecode === "0x") {
+          const erc6492Data = parseErc6492Signature(signature);
+          const hasDeploymentInfo = erc6492Data.address && erc6492Data.data && !isAddressEqual(erc6492Data.address, "0x0000000000000000000000000000000000000000");
+          if (!hasDeploymentInfo) {
+            return {
+              isValid: false,
+              invalidReason: "invalid_exact_evm_payload_undeployed_smart_wallet",
+              payer: payerAddress
+            };
+          }
+        } else {
+          return {
+            isValid: false,
+            invalidReason: "invalid_exact_evm_payload_signature",
+            payer: exactEvmPayload.authorization.from
+          };
+        }
+      } else {
+        return {
+          isValid: false,
+          invalidReason: "invalid_exact_evm_payload_signature",
+          payer: exactEvmPayload.authorization.from
+        };
+      }
+    }
+    if (getAddress2(exactEvmPayload.authorization.to) !== getAddress2(requirements.payTo)) {
+      return {
+        isValid: false,
+        invalidReason: "invalid_exact_evm_payload_recipient_mismatch",
+        payer: exactEvmPayload.authorization.from
+      };
+    }
+    const now = Math.floor(Date.now() / 1e3);
+    if (BigInt(exactEvmPayload.authorization.validBefore) < BigInt(now + 6)) {
+      return {
+        isValid: false,
+        invalidReason: "invalid_exact_evm_payload_authorization_valid_before",
+        payer: exactEvmPayload.authorization.from
+      };
+    }
+    if (BigInt(exactEvmPayload.authorization.validAfter) > BigInt(now)) {
+      return {
+        isValid: false,
+        invalidReason: "invalid_exact_evm_payload_authorization_valid_after",
+        payer: exactEvmPayload.authorization.from
+      };
+    }
+    try {
+      const balance = await this.signer.readContract({
+        address: erc20Address,
+        abi: eip3009ABI,
+        functionName: "balanceOf",
+        args: [exactEvmPayload.authorization.from]
+      });
+      if (BigInt(balance) < BigInt(requirementsV1.maxAmountRequired)) {
+        return {
+          isValid: false,
+          invalidReason: "insufficient_funds",
+          invalidMessage: `Insufficient funds to complete the payment. Required: ${requirementsV1.maxAmountRequired} ${requirements.asset}, Available: ${balance.toString()} ${requirements.asset}. Please add funds to your wallet and try again.`,
+          payer: exactEvmPayload.authorization.from
+        };
+      }
+    } catch {
+    }
+    if (BigInt(exactEvmPayload.authorization.value) < BigInt(requirementsV1.maxAmountRequired)) {
+      return {
+        isValid: false,
+        invalidReason: "invalid_exact_evm_payload_authorization_value",
+        payer: exactEvmPayload.authorization.from
+      };
+    }
+    return {
+      isValid: true,
+      invalidReason: void 0,
+      payer: exactEvmPayload.authorization.from
+    };
+  }
+  /**
+   * Settles a payment by executing the transfer (V1).
+   *
+   * @param payload - The payment payload to settle
+   * @param requirements - The payment requirements
+   * @returns Promise resolving to settlement response
+   */
+  async settle(payload, requirements) {
+    const payloadV1 = payload;
+    const exactEvmPayload = payload.payload;
+    const valid = await this.verify(payload, requirements);
+    if (!valid.isValid) {
+      return {
+        success: false,
+        network: payloadV1.network,
+        transaction: "",
+        errorReason: valid.invalidReason ?? "invalid_scheme",
+        payer: exactEvmPayload.authorization.from
+      };
+    }
+    try {
+      const parseResult = parseErc6492Signature(exactEvmPayload.signature);
+      const { signature, address: factoryAddress, data: factoryCalldata } = parseResult;
+      if (this.config.deployERC4337WithEIP6492 && factoryAddress && factoryCalldata && !isAddressEqual(factoryAddress, "0x0000000000000000000000000000000000000000")) {
+        const payerAddress = exactEvmPayload.authorization.from;
+        const bytecode = await this.signer.getCode({ address: payerAddress });
+        if (!bytecode || bytecode === "0x") {
+          try {
+            console.log(`Deploying ERC-4337 smart wallet for ${payerAddress} via EIP-6492`);
+            const deployTx = await this.signer.sendTransaction({
+              to: factoryAddress,
+              data: factoryCalldata
+            });
+            await this.signer.waitForTransactionReceipt({ hash: deployTx });
+            console.log(`Successfully deployed smart wallet for ${payerAddress}`);
+          } catch (deployError) {
+            console.error("Smart wallet deployment failed:", deployError);
+            throw deployError;
+          }
+        } else {
+          console.log(`Smart wallet for ${payerAddress} already deployed, skipping deployment`);
+        }
+      }
+      const signatureLength = signature.startsWith("0x") ? signature.length - 2 : signature.length;
+      const isECDSA = signatureLength === 130;
+      let tx;
+      if (isECDSA) {
+        const parsedSig = parseSignature(signature);
+        tx = await this.signer.writeContract({
+          address: getAddress2(requirements.asset),
+          abi: eip3009ABI,
+          functionName: "transferWithAuthorization",
+          args: [
+            getAddress2(exactEvmPayload.authorization.from),
+            getAddress2(exactEvmPayload.authorization.to),
+            BigInt(exactEvmPayload.authorization.value),
+            BigInt(exactEvmPayload.authorization.validAfter),
+            BigInt(exactEvmPayload.authorization.validBefore),
+            exactEvmPayload.authorization.nonce,
+            parsedSig.v || parsedSig.yParity,
+            parsedSig.r,
+            parsedSig.s
+          ]
+        });
+      } else {
+        tx = await this.signer.writeContract({
+          address: getAddress2(requirements.asset),
+          abi: eip3009ABI,
+          functionName: "transferWithAuthorization",
+          args: [
+            getAddress2(exactEvmPayload.authorization.from),
+            getAddress2(exactEvmPayload.authorization.to),
+            BigInt(exactEvmPayload.authorization.value),
+            BigInt(exactEvmPayload.authorization.validAfter),
+            BigInt(exactEvmPayload.authorization.validBefore),
+            exactEvmPayload.authorization.nonce,
+            signature
+          ]
+        });
+      }
+      const receipt = await this.signer.waitForTransactionReceipt({ hash: tx });
+      if (receipt.status !== "success") {
+        return {
+          success: false,
+          errorReason: "invalid_transaction_state",
+          transaction: tx,
+          network: payloadV1.network,
+          payer: exactEvmPayload.authorization.from
+        };
+      }
+      return {
+        success: true,
+        transaction: tx,
+        network: payloadV1.network,
+        payer: exactEvmPayload.authorization.from
+      };
+    } catch (error) {
+      console.error("Failed to settle transaction:", error);
+      return {
+        success: false,
+        errorReason: "transaction_failed",
+        transaction: "",
+        network: payloadV1.network,
+        payer: exactEvmPayload.authorization.from
+      };
+    }
+  }
+};
+
+// src/v1/index.ts
+var EVM_NETWORK_CHAIN_ID_MAP = {
+  ethereum: 1,
+  sepolia: 11155111,
+  abstract: 2741,
+  "abstract-testnet": 11124,
+  "base-sepolia": 84532,
+  base: 8453,
+  "avalanche-fuji": 43113,
+  avalanche: 43114,
+  iotex: 4689,
+  sei: 1329,
+  "sei-testnet": 1328,
+  polygon: 137,
+  "polygon-amoy": 80002,
+  peaq: 3338,
+  story: 1514,
+  educhain: 41923,
+  "skale-base-sepolia": 324705682,
+  megaeth: 4326
+};
+var NETWORKS = Object.keys(EVM_NETWORK_CHAIN_ID_MAP);
+
+export {
+  authorizationTypes,
+  permit2WitnessTypes,
+  eip3009ABI,
+  eip2612PermitTypes,
+  eip2612NoncesAbi,
+  PERMIT2_ADDRESS,
+  x402ExactPermit2ProxyAddress,
+  x402UptoPermit2ProxyAddress,
+  x402ExactPermit2ProxyABI,
+  ExactEvmSchemeV1,
+  ExactEvmSchemeV12,
+  EVM_NETWORK_CHAIN_ID_MAP,
+  NETWORKS,
+  createNonce,
+  createPermit2Nonce
+};
+//# sourceMappingURL=chunk-GSU4DHTC.mjs.map

dist/esm/chunk-GSU4DHTC.mjs.map

+{"version":3,"sources":["../../src/exact/v1/client/scheme.ts","../../src/constants.ts","../../src/utils.ts","../../src/exact/v1/facilitator/scheme.ts","../../src/v1/index.ts"],"sourcesContent":["import {\n  Network,\n  PaymentPayload,\n  PaymentRequirements,\n  SchemeNetworkClient,\n} from \"@x402/core/types\";\nimport { PaymentRequirementsV1 } from \"@x402/core/types/v1\";\nimport { getAddress } from \"viem\";\nimport { authorizationTypes } from \"../../../constants\";\nimport { ClientEvmSigner } from \"../../../signer\";\nimport { ExactEvmPayloadV1 } from \"../../../types\";\nimport { createNonce, getEvmChainId } from \"../../../utils\";\nimport { EvmNetworkV1 } from \"../../../v1\";\n\n/**\n * EVM client implementation for the Exact payment scheme (V1).\n */\nexport class ExactEvmSchemeV1 implements SchemeNetworkClient {\n  readonly scheme = \"exact\";\n\n  /**\n   * Creates a new ExactEvmClientV1 instance.\n   *\n   * @param signer - The EVM signer for client operations\n   */\n  constructor(private readonly signer: ClientEvmSigner) {}\n\n  /**\n   * Creates a payment payload for the Exact scheme (V1).\n   *\n   * @param x402Version - The x402 protocol version\n   * @param paymentRequirements - The payment requirements\n   * @returns Promise resolving to a payment payload\n   */\n  async createPaymentPayload(\n    x402Version: number,\n    paymentRequirements: PaymentRequirements,\n  ): Promise<\n    Pick<PaymentPayload, \"x402Version\" | \"payload\"> & { scheme: string; network: Network }\n  > {\n    const selectedV1 = paymentRequirements as unknown as PaymentRequirementsV1;\n    const nonce = createNonce();\n    const now = Math.floor(Date.now() / 1000);\n\n    const authorization: ExactEvmPayloadV1[\"authorization\"] = {\n      from: this.signer.address,\n      to: getAddress(selectedV1.payTo),\n      value: selectedV1.maxAmountRequired,\n      validAfter: (now - 600).toString(), // 10 minutes before\n      validBefore: (now + selectedV1.maxTimeoutSeconds).toString(),\n      nonce,\n    };\n\n    // Sign the authorization\n    const signature = await this.signAuthorization(authorization, selectedV1);\n\n    const payload: ExactEvmPayloadV1 = {\n      authorization,\n      signature,\n    };\n\n    return {\n      x402Version,\n      scheme: selectedV1.scheme,\n      network: selectedV1.network,\n      payload,\n    };\n  }\n\n  /**\n   * Sign the EIP-3009 authorization using EIP-712\n   *\n   * @param authorization - The authorization to sign\n   * @param requirements - The payment requirements\n   * @returns Promise resolving to the signature\n   */\n  private async signAuthorization(\n    authorization: ExactEvmPayloadV1[\"authorization\"],\n    requirements: PaymentRequirementsV1,\n  ): Promise<`0x${string}`> {\n    const chainId = getEvmChainId(requirements.network as EvmNetworkV1);\n\n    if (!requirements.extra?.name || !requirements.extra?.version) {\n      throw new Error(\n        `EIP-712 domain parameters (name, version) are required in payment requirements for asset ${requirements.asset}`,\n      );\n    }\n\n    const { name, version } = requirements.extra;\n\n    const domain = {\n      name,\n      version,\n      chainId,\n      verifyingContract: getAddress(requirements.asset),\n    };\n\n    const message = {\n      from: getAddress(authorization.from),\n      to: getAddress(authorization.to),\n      value: BigInt(authorization.value),\n      validAfter: BigInt(authorization.validAfter),\n      validBefore: BigInt(authorization.validBefore),\n      nonce: authorization.nonce,\n    };\n\n    return await this.signer.signTypedData({\n      domain,\n      types: authorizationTypes,\n      primaryType: \"TransferWithAuthorization\",\n      message,\n    });\n  }\n}\n","// EIP-3009 TransferWithAuthorization types for EIP-712 signing\nexport const authorizationTypes = {\n  TransferWithAuthorization: [\n    { name: \"from\", type: \"address\" },\n    { name: \"to\", type: \"address\" },\n    { name: \"value\", type: \"uint256\" },\n    { name: \"validAfter\", type: \"uint256\" },\n    { name: \"validBefore\", type: \"uint256\" },\n    { name: \"nonce\", type: \"bytes32\" },\n  ],\n} as const;\n\n/**\n * Permit2 EIP-712 types for signing PermitWitnessTransferFrom.\n * Must match the exact format expected by the Permit2 contract.\n * Note: Types must be in ALPHABETICAL order after the primary type (TokenPermissions < Witness).\n */\nexport const permit2WitnessTypes = {\n  PermitWitnessTransferFrom: [\n    { name: \"permitted\", type: \"TokenPermissions\" },\n    { name: \"spender\", type: \"address\" },\n    { name: \"nonce\", type: \"uint256\" },\n    { name: \"deadline\", type: \"uint256\" },\n    { name: \"witness\", type: \"Witness\" },\n  ],\n  TokenPermissions: [\n    { name: \"token\", type: \"address\" },\n    { name: \"amount\", type: \"uint256\" },\n  ],\n  Witness: [\n    { name: \"to\", type: \"address\" },\n    { name: \"validAfter\", type: \"uint256\" },\n    { name: \"extra\", type: \"bytes\" },\n  ],\n} as const;\n\n// EIP3009 ABI for transferWithAuthorization function\nexport const eip3009ABI = [\n  {\n    inputs: [\n      { name: \"from\", type: \"address\" },\n      { name: \"to\", type: \"address\" },\n      { name: \"value\", type: \"uint256\" },\n      { name: \"validAfter\", type: \"uint256\" },\n      { name: \"validBefore\", type: \"uint256\" },\n      { name: \"nonce\", type: \"bytes32\" },\n      { name: \"v\", type: \"uint8\" },\n      { name: \"r\", type: \"bytes32\" },\n      { name: \"s\", type: \"bytes32\" },\n    ],\n    name: \"transferWithAuthorization\",\n    outputs: [],\n    stateMutability: \"nonpayable\",\n    type: \"function\",\n  },\n  {\n    inputs: [\n      { name: \"from\", type: \"address\" },\n      { name: \"to\", type: \"address\" },\n      { name: \"value\", type: \"uint256\" },\n      { name: \"validAfter\", type: \"uint256\" },\n      { name: \"validBefore\", type: \"uint256\" },\n      { name: \"nonce\", type: \"bytes32\" },\n      { name: \"signature\", type: \"bytes\" },\n    ],\n    name: \"transferWithAuthorization\",\n    outputs: [],\n    stateMutability: \"nonpayable\",\n    type: \"function\",\n  },\n  {\n    inputs: [{ name: \"account\", type: \"address\" }],\n    name: \"balanceOf\",\n    outputs: [{ name: \"\", type: \"uint256\" }],\n    stateMutability: \"view\",\n    type: \"function\",\n  },\n  {\n    inputs: [],\n    name: \"version\",\n    outputs: [{ name: \"\", type: \"string\" }],\n    stateMutability: \"view\",\n    type: \"function\",\n  },\n] as const;\n\n/**\n * EIP-2612 Permit EIP-712 types for signing token.permit().\n */\nexport const eip2612PermitTypes = {\n  Permit: [\n    { name: \"owner\", type: \"address\" },\n    { name: \"spender\", type: \"address\" },\n    { name: \"value\", type: \"uint256\" },\n    { name: \"nonce\", type: \"uint256\" },\n    { name: \"deadline\", type: \"uint256\" },\n  ],\n} as const;\n\n/**\n * EIP-2612 nonces ABI for querying current nonce.\n */\nexport const eip2612NoncesAbi = [\n  {\n    type: \"function\",\n    name: \"nonces\",\n    inputs: [{ name: \"owner\", type: \"address\" }],\n    outputs: [{ type: \"uint256\" }],\n    stateMutability: \"view\",\n  },\n] as const;\n\n/**\n * Canonical Permit2 contract address.\n * Same address on all EVM chains via CREATE2 deployment.\n *\n * @see https://github.com/Uniswap/permit2\n */\nexport const PERMIT2_ADDRESS = \"0x000000000022D473030F116dDEE9F6B43aC78BA3\" as const;\n\n/**\n * x402ExactPermit2Proxy contract address.\n * Vanity address: 0x4020...0001 for easy recognition.\n * This address is deterministic based on:\n * - Arachnid's deterministic deployer (0x4e59b44847b379578588920cA78FbF26c0B4956C)\n * - Vanity-mined salt for prefix 0x4020 and suffix 0001\n * - Contract bytecode + constructor args (PERMIT2_ADDRESS)\n */\nexport const x402ExactPermit2ProxyAddress = \"0x4020615294c913F045dc10f0a5cdEbd86c280001\" as const;\n\n/**\n * x402UptoPermit2Proxy contract address.\n * Vanity address: 0x4020...0002 for easy recognition.\n * This address is deterministic based on:\n * - Arachnid's deterministic deployer (0x4e59b44847b379578588920cA78FbF26c0B4956C)\n * - Vanity-mined salt for prefix 0x4020 and suffix 0002\n * - Contract bytecode + constructor args (PERMIT2_ADDRESS)\n */\nexport const x402UptoPermit2ProxyAddress = \"0x4020633461b2895a48930Ff97eE8fCdE8E520002\" as const;\n\n/**\n * x402UptoPermit2Proxy ABI - settle function for upto payment scheme (variable amounts).\n */\nexport const x402UptoPermit2ProxyABI = [\n  {\n    type: \"function\",\n    name: \"PERMIT2\",\n    inputs: [],\n    outputs: [{ name: \"\", type: \"address\", internalType: \"contract ISignatureTransfer\" }],\n    stateMutability: \"view\",\n  },\n  {\n    type: \"function\",\n    name: \"WITNESS_TYPEHASH\",\n    inputs: [],\n    outputs: [{ name: \"\", type: \"bytes32\", internalType: \"bytes32\" }],\n    stateMutability: \"view\",\n  },\n  {\n    type: \"function\",\n    name: \"WITNESS_TYPE_STRING\",\n    inputs: [],\n    outputs: [{ name: \"\", type: \"string\", internalType: \"string\" }],\n    stateMutability: \"view\",\n  },\n  {\n    type: \"function\",\n    name: \"initialize\",\n    inputs: [{ name: \"_permit2\", type: \"address\", internalType: \"address\" }],\n    outputs: [],\n    stateMutability: \"nonpayable\",\n  },\n  {\n    type: \"function\",\n    name: \"settle\",\n    inputs: [\n      {\n        name: \"permit\",\n        type: \"tuple\",\n        internalType: \"struct ISignatureTransfer.PermitTransferFrom\",\n        components: [\n          {\n            name: \"permitted\",\n            type: \"tuple\",\n            internalType: \"struct ISignatureTransfer.TokenPermissions\",\n            components: [\n              { name: \"token\", type: \"address\", internalType: \"address\" },\n              { name: \"amount\", type: \"uint256\", internalType: \"uint256\" },\n            ],\n          },\n          { name: \"nonce\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"deadline\", type: \"uint256\", internalType: \"uint256\" },\n        ],\n      },\n      { name: \"owner\", type: \"address\", internalType: \"address\" },\n      {\n        name: \"witness\",\n        type: \"tuple\",\n        internalType: \"struct x402BasePermit2Proxy.Witness\",\n        components: [\n          { name: \"to\", type: \"address\", internalType: \"address\" },\n          { name: \"validAfter\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"extra\", type: \"bytes\", internalType: \"bytes\" },\n        ],\n      },\n      { name: \"signature\", type: \"bytes\", internalType: \"bytes\" },\n    ],\n    outputs: [],\n    stateMutability: \"nonpayable\",\n  },\n  {\n    type: \"function\",\n    name: \"settleWithPermit\",\n    inputs: [\n      {\n        name: \"permit2612\",\n        type: \"tuple\",\n        internalType: \"struct x402BasePermit2Proxy.EIP2612Permit\",\n        components: [\n          { name: \"value\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"deadline\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"r\", type: \"bytes32\", internalType: \"bytes32\" },\n          { name: \"s\", type: \"bytes32\", internalType: \"bytes32\" },\n          { name: \"v\", type: \"uint8\", internalType: \"uint8\" },\n        ],\n      },\n      {\n        name: \"permit\",\n        type: \"tuple\",\n        internalType: \"struct ISignatureTransfer.PermitTransferFrom\",\n        components: [\n          {\n            name: \"permitted\",\n            type: \"tuple\",\n            internalType: \"struct ISignatureTransfer.TokenPermissions\",\n            components: [\n              { name: \"token\", type: \"address\", internalType: \"address\" },\n              { name: \"amount\", type: \"uint256\", internalType: \"uint256\" },\n            ],\n          },\n          { name: \"nonce\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"deadline\", type: \"uint256\", internalType: \"uint256\" },\n        ],\n      },\n      { name: \"owner\", type: \"address\", internalType: \"address\" },\n      {\n        name: \"witness\",\n        type: \"tuple\",\n        internalType: \"struct x402BasePermit2Proxy.Witness\",\n        components: [\n          { name: \"to\", type: \"address\", internalType: \"address\" },\n          { name: \"validAfter\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"extra\", type: \"bytes\", internalType: \"bytes\" },\n        ],\n      },\n      { name: \"signature\", type: \"bytes\", internalType: \"bytes\" },\n    ],\n    outputs: [],\n    stateMutability: \"nonpayable\",\n  },\n  { type: \"event\", name: \"Settled\", inputs: [], anonymous: false },\n  { type: \"event\", name: \"SettledWithPermit\", inputs: [], anonymous: false },\n  { type: \"error\", name: \"AlreadyInitialized\", inputs: [] },\n  { type: \"error\", name: \"AmountExceedsPermitted\", inputs: [] },\n  { type: \"error\", name: \"InvalidDestination\", inputs: [] },\n  { type: \"error\", name: \"InvalidOwner\", inputs: [] },\n  { type: \"error\", name: \"InvalidPermit2Address\", inputs: [] },\n  { type: \"error\", name: \"PaymentTooEarly\", inputs: [] },\n  { type: \"error\", name: \"ReentrancyGuardReentrantCall\", inputs: [] },\n] as const;\n\n/**\n * x402ExactPermit2Proxy ABI - settle function for exact payment scheme.\n */\nexport const x402ExactPermit2ProxyABI = [\n  {\n    type: \"function\",\n    name: \"PERMIT2\",\n    inputs: [],\n    outputs: [{ name: \"\", type: \"address\", internalType: \"contract ISignatureTransfer\" }],\n    stateMutability: \"view\",\n  },\n  {\n    type: \"function\",\n    name: \"WITNESS_TYPEHASH\",\n    inputs: [],\n    outputs: [{ name: \"\", type: \"bytes32\", internalType: \"bytes32\" }],\n    stateMutability: \"view\",\n  },\n  {\n    type: \"function\",\n    name: \"WITNESS_TYPE_STRING\",\n    inputs: [],\n    outputs: [{ name: \"\", type: \"string\", internalType: \"string\" }],\n    stateMutability: \"view\",\n  },\n  {\n    type: \"function\",\n    name: \"initialize\",\n    inputs: [{ name: \"_permit2\", type: \"address\", internalType: \"address\" }],\n    outputs: [],\n    stateMutability: \"nonpayable\",\n  },\n  {\n    type: \"function\",\n    name: \"settle\",\n    inputs: [\n      {\n        name: \"permit\",\n        type: \"tuple\",\n        internalType: \"struct ISignatureTransfer.PermitTransferFrom\",\n        components: [\n          {\n            name: \"permitted\",\n            type: \"tuple\",\n            internalType: \"struct ISignatureTransfer.TokenPermissions\",\n            components: [\n              { name: \"token\", type: \"address\", internalType: \"address\" },\n              { name: \"amount\", type: \"uint256\", internalType: \"uint256\" },\n            ],\n          },\n          { name: \"nonce\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"deadline\", type: \"uint256\", internalType: \"uint256\" },\n        ],\n      },\n      { name: \"owner\", type: \"address\", internalType: \"address\" },\n      {\n        name: \"witness\",\n        type: \"tuple\",\n        internalType: \"struct x402BasePermit2Proxy.Witness\",\n        components: [\n          { name: \"to\", type: \"address\", internalType: \"address\" },\n          { name: \"validAfter\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"extra\", type: \"bytes\", internalType: \"bytes\" },\n        ],\n      },\n      { name: \"signature\", type: \"bytes\", internalType: \"bytes\" },\n    ],\n    outputs: [],\n    stateMutability: \"nonpayable\",\n  },\n  {\n    type: \"function\",\n    name: \"settleWithPermit\",\n    inputs: [\n      {\n        name: \"permit2612\",\n        type: \"tuple\",\n        internalType: \"struct x402BasePermit2Proxy.EIP2612Permit\",\n        components: [\n          { name: \"value\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"deadline\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"r\", type: \"bytes32\", internalType: \"bytes32\" },\n          { name: \"s\", type: \"bytes32\", internalType: \"bytes32\" },\n          { name: \"v\", type: \"uint8\", internalType: \"uint8\" },\n        ],\n      },\n      {\n        name: \"permit\",\n        type: \"tuple\",\n        internalType: \"struct ISignatureTransfer.PermitTransferFrom\",\n        components: [\n          {\n            name: \"permitted\",\n            type: \"tuple\",\n            internalType: \"struct ISignatureTransfer.TokenPermissions\",\n            components: [\n              { name: \"token\", type: \"address\", internalType: \"address\" },\n              { name: \"amount\", type: \"uint256\", internalType: \"uint256\" },\n            ],\n          },\n          { name: \"nonce\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"deadline\", type: \"uint256\", internalType: \"uint256\" },\n        ],\n      },\n      { name: \"owner\", type: \"address\", internalType: \"address\" },\n      {\n        name: \"witness\",\n        type: \"tuple\",\n        internalType: \"struct x402BasePermit2Proxy.Witness\",\n        components: [\n          { name: \"to\", type: \"address\", internalType: \"address\" },\n          { name: \"validAfter\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"extra\", type: \"bytes\", internalType: \"bytes\" },\n        ],\n      },\n      { name: \"signature\", type: \"bytes\", internalType: \"bytes\" },\n    ],\n    outputs: [],\n    stateMutability: \"nonpayable\",\n  },\n  { type: \"event\", name: \"Settled\", inputs: [], anonymous: false },\n  { type: \"event\", name: \"SettledWithPermit\", inputs: [], anonymous: false },\n  { type: \"error\", name: \"AlreadyInitialized\", inputs: [] },\n  { type: \"error\", name: \"InvalidDestination\", inputs: [] },\n  { type: \"error\", name: \"InvalidOwner\", inputs: [] },\n  { type: \"error\", name: \"InvalidPermit2Address\", inputs: [] },\n  { type: \"error\", name: \"PaymentTooEarly\", inputs: [] },\n  { type: \"error\", name: \"ReentrancyGuardReentrantCall\", inputs: [] },\n] as const;\n","import { toHex } from \"viem\";\nimport { EVM_NETWORK_CHAIN_ID_MAP, EvmNetworkV1 } from \"./v1\";\n\n/**\n * Extract chain ID from network string (e.g., \"base-sepolia\" -> 84532)\n * Used by v1 implementations\n *\n * @param network - The network identifier\n * @returns The numeric chain ID\n * @throws Error if the network is not supported\n */\nexport function getEvmChainId(network: EvmNetworkV1): number {\n  const chainId = EVM_NETWORK_CHAIN_ID_MAP[network];\n  if (!chainId) {\n    throw new Error(`Unsupported network: ${network}`);\n  }\n  return chainId;\n}\n\n/**\n * Get the crypto object from the global scope.\n *\n * @returns The crypto object\n * @throws Error if crypto API is not available\n */\nfunction getCrypto(): Crypto {\n  const cryptoObj = globalThis.crypto as Crypto | undefined;\n  if (!cryptoObj) {\n    throw new Error(\"Crypto API not available\");\n  }\n  return cryptoObj;\n}\n\n/**\n * Create a random 32-byte nonce for EIP-3009 authorization.\n *\n * @returns A hex-encoded 32-byte nonce\n */\nexport function createNonce(): `0x${string}` {\n  return toHex(getCrypto().getRandomValues(new Uint8Array(32)));\n}\n\n/**\n * Creates a random 256-bit nonce for Permit2.\n * Permit2 uses uint256 nonces (not bytes32 like EIP-3009).\n *\n * @returns A string representation of the random nonce\n */\nexport function createPermit2Nonce(): string {\n  const randomBytes = getCrypto().getRandomValues(new Uint8Array(32));\n  return BigInt(toHex(randomBytes)).toString();\n}\n","import {\n  PaymentPayload,\n  PaymentPayloadV1,\n  PaymentRequirements,\n  SchemeNetworkFacilitator,\n  SettleResponse,\n  VerifyResponse,\n} from \"@x402/core/types\";\nimport { PaymentRequirementsV1 } from \"@x402/core/types/v1\";\nimport { getAddress, Hex, isAddressEqual, parseErc6492Signature, parseSignature } from \"viem\";\nimport { authorizationTypes, eip3009ABI } from \"../../../constants\";\nimport { FacilitatorEvmSigner } from \"../../../signer\";\nimport { ExactEvmPayloadV1 } from \"../../../types\";\nimport { getEvmChainId } from \"../../../utils\";\nimport { EvmNetworkV1 } from \"../../../v1\";\n\nexport interface ExactEvmSchemeV1Config {\n  /**\n   * If enabled, the facilitator will deploy ERC-4337 smart wallets\n   * via EIP-6492 when encountering undeployed contract signatures.\n   *\n   * @default false\n   */\n  deployERC4337WithEIP6492?: boolean;\n}\n\n/**\n * EVM facilitator implementation for the Exact payment scheme (V1).\n */\nexport class ExactEvmSchemeV1 implements SchemeNetworkFacilitator {\n  readonly scheme = \"exact\";\n  readonly caipFamily = \"eip155:*\";\n  private readonly config: Required<ExactEvmSchemeV1Config>;\n\n  /**\n   * Creates a new ExactEvmFacilitatorV1 instance.\n   *\n   * @param signer - The EVM signer for facilitator operations\n   * @param config - Optional configuration for the facilitator\n   */\n  constructor(\n    private readonly signer: FacilitatorEvmSigner,\n    config?: ExactEvmSchemeV1Config,\n  ) {\n    this.config = {\n      deployERC4337WithEIP6492: config?.deployERC4337WithEIP6492 ?? false,\n    };\n  }\n\n  /**\n   * Get mechanism-specific extra data for the supported kinds endpoint.\n   * For EVM, no extra data is needed.\n   *\n   * @param _ - The network identifier (unused for EVM)\n   * @returns undefined (EVM has no extra data)\n   */\n  getExtra(_: string): Record<string, unknown> | undefined {\n    return undefined;\n  }\n\n  /**\n   * Get signer addresses used by this facilitator.\n   * Returns all addresses this facilitator can use for signing/settling transactions.\n   *\n   * @param _ - The network identifier (unused for EVM, addresses are network-agnostic)\n   * @returns Array of facilitator wallet addresses\n   */\n  getSigners(_: string): string[] {\n    return [...this.signer.getAddresses()];\n  }\n\n  /**\n   * Verifies a payment payload (V1).\n   *\n   * @param payload - The payment payload to verify\n   * @param requirements - The payment requirements\n   * @returns Promise resolving to verification response\n   */\n  async verify(\n    payload: PaymentPayload,\n    requirements: PaymentRequirements,\n  ): Promise<VerifyResponse> {\n    const requirementsV1 = requirements as unknown as PaymentRequirementsV1;\n    const payloadV1 = payload as unknown as PaymentPayloadV1;\n    const exactEvmPayload = payload.payload as ExactEvmPayloadV1;\n\n    // Verify scheme matches\n    if (payloadV1.scheme !== \"exact\" || requirements.scheme !== \"exact\") {\n      return {\n        isValid: false,\n        invalidReason: \"unsupported_scheme\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    // Get chain configuration\n    let chainId: number;\n    try {\n      chainId = getEvmChainId(payloadV1.network as EvmNetworkV1);\n    } catch {\n      return {\n        isValid: false,\n        invalidReason: `invalid_network`,\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    if (!requirements.extra?.name || !requirements.extra?.version) {\n      return {\n        isValid: false,\n        invalidReason: \"missing_eip712_domain\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    const { name, version } = requirements.extra;\n    const erc20Address = getAddress(requirements.asset);\n\n    // Verify network matches\n    if (payloadV1.network !== requirements.network) {\n      return {\n        isValid: false,\n        invalidReason: \"network_mismatch\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    // Build typed data for signature verification\n    const permitTypedData = {\n      types: authorizationTypes,\n      primaryType: \"TransferWithAuthorization\" as const,\n      domain: {\n        name,\n        version,\n        chainId,\n        verifyingContract: erc20Address,\n      },\n      message: {\n        from: exactEvmPayload.authorization.from,\n        to: exactEvmPayload.authorization.to,\n        value: BigInt(exactEvmPayload.authorization.value),\n        validAfter: BigInt(exactEvmPayload.authorization.validAfter),\n        validBefore: BigInt(exactEvmPayload.authorization.validBefore),\n        nonce: exactEvmPayload.authorization.nonce,\n      },\n    };\n\n    // Verify signature\n    try {\n      const recoveredAddress = await this.signer.verifyTypedData({\n        address: exactEvmPayload.authorization.from,\n        ...permitTypedData,\n        signature: exactEvmPayload.signature!,\n      });\n\n      if (!recoveredAddress) {\n        return {\n          isValid: false,\n          invalidReason: \"invalid_exact_evm_payload_signature\",\n          payer: exactEvmPayload.authorization.from,\n        };\n      }\n    } catch {\n      // Signature verification failed - could be an undeployed smart wallet\n      // Check if smart wallet is deployed\n      const signature = exactEvmPayload.signature!;\n      const signatureLength = signature.startsWith(\"0x\") ? signature.length - 2 : signature.length;\n      const isSmartWallet = signatureLength > 130; // 65 bytes = 130 hex chars for EOA\n\n      if (isSmartWallet) {\n        const payerAddress = exactEvmPayload.authorization.from;\n        const bytecode = await this.signer.getCode({ address: payerAddress });\n\n        if (!bytecode || bytecode === \"0x\") {\n          // Wallet is not deployed. Check if it's EIP-6492 with deployment info.\n          // EIP-6492 signatures contain factory address and calldata needed for deployment.\n          // Non-EIP-6492 undeployed wallets cannot succeed (no way to deploy them).\n          const erc6492Data = parseErc6492Signature(signature);\n          const hasDeploymentInfo =\n            erc6492Data.address &&\n            erc6492Data.data &&\n            !isAddressEqual(erc6492Data.address, \"0x0000000000000000000000000000000000000000\");\n\n          if (!hasDeploymentInfo) {\n            // Non-EIP-6492 undeployed smart wallet - will always fail at settlement\n            // since EIP-3009 requires on-chain EIP-1271 validation\n            return {\n              isValid: false,\n              invalidReason: \"invalid_exact_evm_payload_undeployed_smart_wallet\",\n              payer: payerAddress,\n            };\n          }\n          // EIP-6492 signature with deployment info - allow through\n          // Facilitators with sponsored deployment support can handle this in settle()\n        } else {\n          // Wallet is deployed but signature still failed - invalid signature\n          return {\n            isValid: false,\n            invalidReason: \"invalid_exact_evm_payload_signature\",\n            payer: exactEvmPayload.authorization.from,\n          };\n        }\n      } else {\n        // EOA signature failed\n        return {\n          isValid: false,\n          invalidReason: \"invalid_exact_evm_payload_signature\",\n          payer: exactEvmPayload.authorization.from,\n        };\n      }\n    }\n\n    // Verify payment recipient matches\n    if (getAddress(exactEvmPayload.authorization.to) !== getAddress(requirements.payTo)) {\n      return {\n        isValid: false,\n        invalidReason: \"invalid_exact_evm_payload_recipient_mismatch\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    // Verify validBefore is in the future (with 6 second buffer for block time)\n    const now = Math.floor(Date.now() / 1000);\n    if (BigInt(exactEvmPayload.authorization.validBefore) < BigInt(now + 6)) {\n      return {\n        isValid: false,\n        invalidReason: \"invalid_exact_evm_payload_authorization_valid_before\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    // Verify validAfter is not in the future\n    if (BigInt(exactEvmPayload.authorization.validAfter) > BigInt(now)) {\n      return {\n        isValid: false,\n        invalidReason: \"invalid_exact_evm_payload_authorization_valid_after\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    // Check balance\n    try {\n      const balance = (await this.signer.readContract({\n        address: erc20Address,\n        abi: eip3009ABI,\n        functionName: \"balanceOf\",\n        args: [exactEvmPayload.authorization.from],\n      })) as bigint;\n\n      if (BigInt(balance) < BigInt(requirementsV1.maxAmountRequired)) {\n        return {\n          isValid: false,\n          invalidReason: \"insufficient_funds\",\n          invalidMessage: `Insufficient funds to complete the payment. Required: ${requirementsV1.maxAmountRequired} ${requirements.asset}, Available: ${balance.toString()} ${requirements.asset}. Please add funds to your wallet and try again.`,\n          payer: exactEvmPayload.authorization.from,\n        };\n      }\n    } catch {\n      // If we can't check balance, continue with other validations\n    }\n\n    // Verify amount is sufficient\n    if (BigInt(exactEvmPayload.authorization.value) < BigInt(requirementsV1.maxAmountRequired)) {\n      return {\n        isValid: false,\n        invalidReason: \"invalid_exact_evm_payload_authorization_value\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    return {\n      isValid: true,\n      invalidReason: undefined,\n      payer: exactEvmPayload.authorization.from,\n    };\n  }\n\n  /**\n   * Settles a payment by executing the transfer (V1).\n   *\n   * @param payload - The payment payload to settle\n   * @param requirements - The payment requirements\n   * @returns Promise resolving to settlement response\n   */\n  async settle(\n    payload: PaymentPayload,\n    requirements: PaymentRequirements,\n  ): Promise<SettleResponse> {\n    const payloadV1 = payload as unknown as PaymentPayloadV1;\n    const exactEvmPayload = payload.payload as ExactEvmPayloadV1;\n\n    // Re-verify before settling\n    const valid = await this.verify(payload, requirements);\n    if (!valid.isValid) {\n      return {\n        success: false,\n        network: payloadV1.network,\n        transaction: \"\",\n        errorReason: valid.invalidReason ?? \"invalid_scheme\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    try {\n      // Parse ERC-6492 signature if applicable\n      const parseResult = parseErc6492Signature(exactEvmPayload.signature!);\n      const { signature, address: factoryAddress, data: factoryCalldata } = parseResult;\n\n      // Deploy ERC-4337 smart wallet via EIP-6492 if configured and needed\n      if (\n        this.config.deployERC4337WithEIP6492 &&\n        factoryAddress &&\n        factoryCalldata &&\n        !isAddressEqual(factoryAddress, \"0x0000000000000000000000000000000000000000\")\n      ) {\n        // Check if smart wallet is already deployed\n        const payerAddress = exactEvmPayload.authorization.from;\n        const bytecode = await this.signer.getCode({ address: payerAddress });\n\n        if (!bytecode || bytecode === \"0x\") {\n          // Wallet not deployed - attempt deployment\n          try {\n            console.log(`Deploying ERC-4337 smart wallet for ${payerAddress} via EIP-6492`);\n\n            // Send the factory calldata directly as a transaction\n            // The factoryCalldata already contains the complete encoded function call\n            const deployTx = await this.signer.sendTransaction({\n              to: factoryAddress as Hex,\n              data: factoryCalldata as Hex,\n            });\n\n            // Wait for deployment transaction\n            await this.signer.waitForTransactionReceipt({ hash: deployTx });\n            console.log(`Successfully deployed smart wallet for ${payerAddress}`);\n          } catch (deployError) {\n            console.error(\"Smart wallet deployment failed:\", deployError);\n            // Deployment failed - cannot proceed\n            throw deployError;\n          }\n        } else {\n          console.log(`Smart wallet for ${payerAddress} already deployed, skipping deployment`);\n        }\n      }\n\n      // Determine if this is an ECDSA signature (EOA) or smart wallet signature\n      // ECDSA signatures are exactly 65 bytes (130 hex chars without 0x)\n      const signatureLength = signature.startsWith(\"0x\") ? signature.length - 2 : signature.length;\n      const isECDSA = signatureLength === 130;\n\n      let tx: Hex;\n      if (isECDSA) {\n        // For EOA wallets, parse signature into v, r, s and use that overload\n        const parsedSig = parseSignature(signature);\n\n        tx = await this.signer.writeContract({\n          address: getAddress(requirements.asset),\n          abi: eip3009ABI,\n          functionName: \"transferWithAuthorization\",\n          args: [\n            getAddress(exactEvmPayload.authorization.from),\n            getAddress(exactEvmPayload.authorization.to),\n            BigInt(exactEvmPayload.authorization.value),\n            BigInt(exactEvmPayload.authorization.validAfter),\n            BigInt(exactEvmPayload.authorization.validBefore),\n            exactEvmPayload.authorization.nonce,\n            (parsedSig.v as number | undefined) || parsedSig.yParity,\n            parsedSig.r,\n            parsedSig.s,\n          ],\n        });\n      } else {\n        // For smart wallets, use the bytes signature overload\n        // The signature contains WebAuthn/P256 or other ERC-1271 compatible signature data\n        tx = await this.signer.writeContract({\n          address: getAddress(requirements.asset),\n          abi: eip3009ABI,\n          functionName: \"transferWithAuthorization\",\n          args: [\n            getAddress(exactEvmPayload.authorization.from),\n            getAddress(exactEvmPayload.authorization.to),\n            BigInt(exactEvmPayload.authorization.value),\n            BigInt(exactEvmPayload.authorization.validAfter),\n            BigInt(exactEvmPayload.authorization.validBefore),\n            exactEvmPayload.authorization.nonce,\n            signature,\n          ],\n        });\n      }\n\n      // Wait for transaction confirmation\n      const receipt = await this.signer.waitForTransactionReceipt({ hash: tx });\n\n      if (receipt.status !== \"success\") {\n        return {\n          success: false,\n          errorReason: \"invalid_transaction_state\",\n          transaction: tx,\n          network: payloadV1.network,\n          payer: exactEvmPayload.authorization.from,\n        };\n      }\n\n      return {\n        success: true,\n        transaction: tx,\n        network: payloadV1.network,\n        payer: exactEvmPayload.authorization.from,\n      };\n    } catch (error) {\n      console.error(\"Failed to settle transaction:\", error);\n      return {\n        success: false,\n        errorReason: \"transaction_failed\",\n        transaction: \"\",\n        network: payloadV1.network,\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n  }\n}\n","export { ExactEvmSchemeV1 } from \"../exact/v1\";\n\nexport const EVM_NETWORK_CHAIN_ID_MAP = {\n  ethereum: 1,\n  sepolia: 11155111,\n  abstract: 2741,\n  \"abstract-testnet\": 11124,\n  \"base-sepolia\": 84532,\n  base: 8453,\n  \"avalanche-fuji\": 43113,\n  avalanche: 43114,\n  iotex: 4689,\n  sei: 1329,\n  \"sei-testnet\": 1328,\n  polygon: 137,\n  \"polygon-amoy\": 80002,\n  peaq: 3338,\n  story: 1514,\n  educhain: 41923,\n  \"skale-base-sepolia\": 324705682,\n  megaeth: 4326,\n} as const;\n\nexport type EvmNetworkV1 = keyof typeof EVM_NETWORK_CHAIN_ID_MAP;\n\nexport const NETWORKS: string[] = 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dist/esm/permit2-C2FkNEHT.d.mts

+import { SchemeNetworkClient, PaymentRequirements, PaymentPayloadContext, PaymentPayloadResult } from '@x402/core/types';
+import { C as ClientEvmSigner } from './signer-3KGwtdNT.mjs';
+
+/**
+ * EVM client implementation for the Exact payment scheme.
+ * Supports both EIP-3009 (transferWithAuthorization) and Permit2 flows.
+ *
+ * Routes to the appropriate authorization method based on
+ * `requirements.extra.assetTransferMethod`. Defaults to EIP-3009
+ * for backward compatibility with older facilitators.
+ *
+ * When the server advertises `eip2612GasSponsoring` and the asset transfer
+ * method is `permit2`, the scheme automatically signs an EIP-2612 permit
+ * if the user lacks Permit2 approval. This requires `readContract` on the signer.
+ */
+declare class ExactEvmScheme implements SchemeNetworkClient {
+    private readonly signer;
+    readonly scheme = "exact";
+    /**
+     * Creates a new ExactEvmClient instance.
+     *
+     * @param signer - The EVM signer for client operations.
+     *   Must support `readContract` for EIP-2612 gas sponsoring.
+     *   Use `createWalletClient(...).extend(publicActions)` or `toClientEvmSigner(account, publicClient)`.
+     */
+    constructor(signer: ClientEvmSigner);
+    /**
+     * Creates a payment payload for the Exact scheme.
+     * Routes to EIP-3009 or Permit2 based on requirements.extra.assetTransferMethod.
+     *
+     * For Permit2 flows, if the server advertises `eip2612GasSponsoring` and the
+     * signer supports `readContract`, automatically signs an EIP-2612 permit
+     * when Permit2 allowance is insufficient.
+     *
+     * @param x402Version - The x402 protocol version
+     * @param paymentRequirements - The payment requirements
+     * @param context - Optional context with server-declared extensions
+     * @returns Promise resolving to a payment payload result (with optional extensions)
+     */
+    createPaymentPayload(x402Version: number, paymentRequirements: PaymentRequirements, context?: PaymentPayloadContext): Promise<PaymentPayloadResult>;
+    /**
+     * Attempts to sign an EIP-2612 permit for gasless Permit2 approval.
+     *
+     * Returns extension data if:
+     * 1. Server advertises eip2612GasSponsoring
+     * 2. Signer has readContract capability
+     * 3. Current Permit2 allowance is insufficient
+     *
+     * Returns undefined if the extension should not be used.
+     *
+     * @param requirements - The payment requirements from the server
+     * @param result - The payment payload result from the scheme
+     * @param context - Optional context containing server extensions and metadata
+     * @returns Extension data for EIP-2612 gas sponsoring, or undefined if not applicable
+     */
+    private trySignEip2612Permit;
+}
+
+/**
+ * ERC20 allowance ABI for checking approval status.
+ */
+declare const erc20AllowanceAbi: readonly [{
+    readonly type: "function";
+    readonly name: "allowance";
+    readonly inputs: readonly [{
+        readonly name: "owner";
+        readonly type: "address";
+    }, {
+        readonly name: "spender";
+        readonly type: "address";
+    }];
+    readonly outputs: readonly [{
+        readonly type: "uint256";
+    }];
+    readonly stateMutability: "view";
+}];
+/**
+ * Creates transaction data to approve Permit2 to spend tokens.
+ * The user sends this transaction (paying gas) before using Permit2 flow.
+ *
+ * @param tokenAddress - The ERC20 token contract address
+ * @returns Transaction data to send for approval
+ *
+ * @example
+ * ```typescript
+ * const tx = createPermit2ApprovalTx("0x...");
+ * await walletClient.sendTransaction({
+ *   to: tx.to,
+ *   data: tx.data,
+ * });
+ * ```
+ */
+declare function createPermit2ApprovalTx(tokenAddress: `0x${string}`): {
+    to: `0x${string}`;
+    data: `0x${string}`;
+};
+/**
+ * Parameters for checking Permit2 allowance.
+ * Application provides these to check if approval is needed.
+ */
+interface Permit2AllowanceParams {
+    tokenAddress: `0x${string}`;
+    ownerAddress: `0x${string}`;
+}
+/**
+ * Returns contract read parameters for checking Permit2 allowance.
+ * Use with a public client to check if the user has approved Permit2.
+ *
+ * @param params - The allowance check parameters
+ * @returns Contract read parameters for checking allowance
+ *
+ * @example
+ * ```typescript
+ * const readParams = getPermit2AllowanceReadParams({
+ *   tokenAddress: "0x...",
+ *   ownerAddress: "0x...",
+ * });
+ *
+ * const allowance = await publicClient.readContract(readParams);
+ * const needsApproval = allowance < requiredAmount;
+ * ```
+ */
+declare function getPermit2AllowanceReadParams(params: Permit2AllowanceParams): {
+    address: `0x${string}`;
+    abi: typeof erc20AllowanceAbi;
+    functionName: "allowance";
+    args: [`0x${string}`, `0x${string}`];
+};
+
+export { ExactEvmScheme as E, type Permit2AllowanceParams as P, createPermit2ApprovalTx as c, erc20AllowanceAbi as e, getPermit2AllowanceReadParams as g };

dist/esm/signer-3KGwtdNT.d.mts

+/**
+ * ClientEvmSigner - Used by x402 clients to sign payment authorizations.
+ *
+ * Typically a viem WalletClient extended with publicActions:
+ * ```typescript
+ * const client = createWalletClient({
+ *   account: privateKeyToAccount('0x...'),
+ *   chain: baseSepolia,
+ *   transport: http(),
+ * }).extend(publicActions);
+ * ```
+ *
+ * Or composed via `toClientEvmSigner(account, publicClient)`.
+ */
+type ClientEvmSigner = {
+    readonly address: `0x${string}`;
+    signTypedData(message: {
+        domain: Record<string, unknown>;
+        types: Record<string, unknown>;
+        primaryType: string;
+        message: Record<string, unknown>;
+    }): Promise<`0x${string}`>;
+    readContract(args: {
+        address: `0x${string}`;
+        abi: readonly unknown[];
+        functionName: string;
+        args?: readonly unknown[];
+    }): Promise<unknown>;
+};
+/**
+ * FacilitatorEvmSigner - Used by x402 facilitators to verify and settle payments
+ * This is typically a viem PublicClient + WalletClient combination that can
+ * read contract state, verify signatures, write transactions, and wait for receipts
+ *
+ * Supports multiple addresses for load balancing, key rotation, and high availability
+ */
+type FacilitatorEvmSigner = {
+    /**
+     * Get all addresses this facilitator can use for signing
+     * Enables dynamic address selection for load balancing and key rotation
+     */
+    getAddresses(): readonly `0x${string}`[];
+    readContract(args: {
+        address: `0x${string}`;
+        abi: readonly unknown[];
+        functionName: string;
+        args?: readonly unknown[];
+    }): Promise<unknown>;
+    verifyTypedData(args: {
+        address: `0x${string}`;
+        domain: Record<string, unknown>;
+        types: Record<string, unknown>;
+        primaryType: string;
+        message: Record<string, unknown>;
+        signature: `0x${string}`;
+    }): Promise<boolean>;
+    writeContract(args: {
+        address: `0x${string}`;
+        abi: readonly unknown[];
+        functionName: string;
+        args: readonly unknown[];
+    }): Promise<`0x${string}`>;
+    sendTransaction(args: {
+        to: `0x${string}`;
+        data: `0x${string}`;
+    }): Promise<`0x${string}`>;
+    waitForTransactionReceipt(args: {
+        hash: `0x${string}`;
+    }): Promise<{
+        status: string;
+    }>;
+    getCode(args: {
+        address: `0x${string}`;
+    }): Promise<`0x${string}` | undefined>;
+};
+/**
+ * Composes a ClientEvmSigner from a local account and a public client.
+ *
+ * Use this when your signer (e.g., `privateKeyToAccount`) doesn't have
+ * `readContract`. The `publicClient` provides the on-chain read capability.
+ *
+ * Alternatively, use a WalletClient extended with publicActions directly:
+ * ```typescript
+ * const signer = createWalletClient({
+ *   account: privateKeyToAccount('0x...'),
+ *   chain: baseSepolia,
+ *   transport: http(),
+ * }).extend(publicActions);
+ * ```
+ *
+ * @param signer - A signer with `address` and `signTypedData` (and optionally `readContract`)
+ * @param publicClient - A client with `readContract` (required if signer lacks it)
+ * @param publicClient.readContract - The readContract method from the public client
+ * @returns A complete ClientEvmSigner
+ *
+ * @example
+ * ```typescript
+ * const account = privateKeyToAccount("0x...");
+ * const publicClient = createPublicClient({ chain: baseSepolia, transport: http() });
+ * const signer = toClientEvmSigner(account, publicClient);
+ * ```
+ */
+declare function toClientEvmSigner(signer: Omit<ClientEvmSigner, "readContract"> & {
+    readContract?: ClientEvmSigner["readContract"];
+}, publicClient?: {
+    readContract(args: {
+        address: `0x${string}`;
+        abi: readonly unknown[];
+        functionName: string;
+        args?: readonly unknown[];
+    }): Promise<unknown>;
+}): ClientEvmSigner;
+/**
+ * Converts a viem client with single address to a FacilitatorEvmSigner
+ * Wraps the single address in a getAddresses() function for compatibility
+ *
+ * @param client - The client to convert (must have 'address' property)
+ * @returns FacilitatorEvmSigner with getAddresses() support
+ */
+declare function toFacilitatorEvmSigner(client: Omit<FacilitatorEvmSigner, "getAddresses"> & {
+    address: `0x${string}`;
+}): FacilitatorEvmSigner;
+
+export { type ClientEvmSigner as C, type FacilitatorEvmSigner as F, toFacilitatorEvmSigner as a, toClientEvmSigner as t };

dist/cjs/exact/client/index.d.ts

@@ -1,5 +0,5 @@
-export { E as ExactEvmScheme, P as Permit2AllowanceParams, c as createPermit2ApprovalTx, e as erc20AllowanceAbi, g as getPermit2AllowanceReadParams } from '../../permit2-BYv82va2.js';
+export { E as ExactEvmScheme, P as Permit2AllowanceParams, c as createPermit2ApprovalTx, e as erc20AllowanceAbi, g as getPermit2AllowanceReadParams } from '../../permit2-CzKPU5By.js';
 import { SelectPaymentRequirements, PaymentPolicy, x402Client } from '@x402/core/client';
 import { Network } from '@x402/core/types';
-import { C as ClientEvmSigner } from '../../signer-5OVDxViv.js';
+import { C as ClientEvmSigner } from '../../signer-3KGwtdNT.js';
 
@@ -6,0 +6,0 @@ /**

dist/cjs/exact/client/index.js

@@ -31,4 +31,4 @@ "use strict";
 
-// src/exact/client/eip3009.ts
-var import_viem4 = require("viem");
+// src/exact/client/scheme.ts
+var import_extensions = require("@x402/extensions");
 
@@ -64,5 +64,29 @@ // src/constants.ts
 };
+var eip2612PermitTypes = {
+  Permit: [
+    { name: "owner", type: "address" },
+    { name: "spender", type: "address" },
+    { name: "value", type: "uint256" },
+    { name: "nonce", type: "uint256" },
+    { name: "deadline", type: "uint256" }
+  ]
+};
+var eip2612NoncesAbi = [
+  {
+    type: "function",
+    name: "nonces",
+    inputs: [{ name: "owner", type: "address" }],
+    outputs: [{ type: "uint256" }],
+    stateMutability: "view"
+  }
+];
 var PERMIT2_ADDRESS = "0x000000000022D473030F116dDEE9F6B43aC78BA3";
 var x402ExactPermit2ProxyAddress = "0x4020615294c913F045dc10f0a5cdEbd86c280001";
 
+// src/exact/client/scheme.ts
+var import_viem7 = require("viem");
+
+// src/exact/client/eip3009.ts
+var import_viem4 = require("viem");
+
 // src/utils.ts
@@ -363,3 +387,58 @@ var import_viem3 = require("viem");
 
+// src/exact/client/eip2612.ts
+var import_viem6 = require("viem");
+var MAX_UINT2562 = BigInt("0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff");
+async function signEip2612Permit(signer, tokenAddress, tokenName, tokenVersion, chainId, deadline) {
+  const owner = signer.address;
+  const spender = (0, import_viem6.getAddress)(PERMIT2_ADDRESS);
+  const nonce = await signer.readContract({
+    address: tokenAddress,
+    abi: eip2612NoncesAbi,
+    functionName: "nonces",
+    args: [owner]
+  });
+  const domain = {
+    name: tokenName,
+    version: tokenVersion,
+    chainId,
+    verifyingContract: tokenAddress
+  };
+  const message = {
+    owner,
+    spender,
+    value: MAX_UINT2562,
+    nonce,
+    deadline: BigInt(deadline)
+  };
+  const signature = await signer.signTypedData({
+    domain,
+    types: eip2612PermitTypes,
+    primaryType: "Permit",
+    message
+  });
+  return {
+    from: owner,
+    asset: tokenAddress,
+    spender,
+    amount: MAX_UINT2562.toString(),
+    nonce: nonce.toString(),
+    deadline,
+    signature,
+    version: "1"
+  };
+}
+
 // src/exact/client/scheme.ts
+var erc20AllowanceAbi2 = [
+  {
+    type: "function",
+    name: "allowance",
+    inputs: [
+      { name: "owner", type: "address" },
+      { name: "spender", type: "address" }
+    ],
+    outputs: [{ type: "uint256" }],
+    stateMutability: "view"
+  }
+];
 var ExactEvmScheme = class {
@@ -369,3 +448,5 @@ /**
    *
-   * @param signer - The EVM signer for client operations
+   * @param signer - The EVM signer for client operations.
+   *   Must support `readContract` for EIP-2612 gas sponsoring.
+   *   Use `createWalletClient(...).extend(publicActions)` or `toClientEvmSigner(account, publicClient)`.
    */
@@ -380,13 +461,82 @@ constructor(signer) {
    *
+   * For Permit2 flows, if the server advertises `eip2612GasSponsoring` and the
+   * signer supports `readContract`, automatically signs an EIP-2612 permit
+   * when Permit2 allowance is insufficient.
+   *
    * @param x402Version - The x402 protocol version
    * @param paymentRequirements - The payment requirements
-   * @returns Promise resolving to a payment payload result
+   * @param context - Optional context with server-declared extensions
+   * @returns Promise resolving to a payment payload result (with optional extensions)
    */
-  async createPaymentPayload(x402Version, paymentRequirements) {
+  async createPaymentPayload(x402Version, paymentRequirements, context) {
     const assetTransferMethod = paymentRequirements.extra?.assetTransferMethod ?? "eip3009";
     if (assetTransferMethod === "permit2") {
-      return createPermit2Payload(this.signer, x402Version, paymentRequirements);
+      const result = await createPermit2Payload(this.signer, x402Version, paymentRequirements);
+      const eip2612Extensions = await this.trySignEip2612Permit(
+        paymentRequirements,
+        result,
+        context
+      );
+      if (eip2612Extensions) {
+        return {
+          ...result,
+          extensions: eip2612Extensions
+        };
+      }
+      return result;
     }
     return createEIP3009Payload(this.signer, x402Version, paymentRequirements);
   }
+  /**
+   * Attempts to sign an EIP-2612 permit for gasless Permit2 approval.
+   *
+   * Returns extension data if:
+   * 1. Server advertises eip2612GasSponsoring
+   * 2. Signer has readContract capability
+   * 3. Current Permit2 allowance is insufficient
+   *
+   * Returns undefined if the extension should not be used.
+   *
+   * @param requirements - The payment requirements from the server
+   * @param result - The payment payload result from the scheme
+   * @param context - Optional context containing server extensions and metadata
+   * @returns Extension data for EIP-2612 gas sponsoring, or undefined if not applicable
+   */
+  async trySignEip2612Permit(requirements, result, context) {
+    if (!context?.extensions?.[import_extensions.EIP2612_GAS_SPONSORING.key]) {
+      return void 0;
+    }
+    const tokenName = requirements.extra?.name;
+    const tokenVersion = requirements.extra?.version;
+    if (!tokenName || !tokenVersion) {
+      return void 0;
+    }
+    const chainId = parseInt(requirements.network.split(":")[1]);
+    const tokenAddress = (0, import_viem7.getAddress)(requirements.asset);
+    try {
+      const allowance = await this.signer.readContract({
+        address: tokenAddress,
+        abi: erc20AllowanceAbi2,
+        functionName: "allowance",
+        args: [this.signer.address, PERMIT2_ADDRESS]
+      });
+      if (allowance >= BigInt(requirements.amount)) {
+        return void 0;
+      }
+    } catch {
+    }
+    const permit2Auth = result.payload?.permit2Authorization;
+    const deadline = permit2Auth?.deadline ?? Math.floor(Date.now() / 1e3 + requirements.maxTimeoutSeconds).toString();
+    const info = await signEip2612Permit(
+      this.signer,
+      tokenAddress,
+      tokenName,
+      tokenVersion,
+      chainId,
+      deadline
+    );
+    return {
+      [import_extensions.EIP2612_GAS_SPONSORING.key]: { info }
+    };
+  }
 };
@@ -396,8 +546,9 @@
 function registerExactEvmScheme(client, config) {
+  const evmScheme = new ExactEvmScheme(config.signer);
   if (config.networks && config.networks.length > 0) {
     config.networks.forEach((network) => {
-      client.register(network, new ExactEvmScheme(config.signer));
+      client.register(network, evmScheme);
     });
   } else {
-    client.register("eip155:*", new ExactEvmScheme(config.signer));
+    client.register("eip155:*", evmScheme);
   }
@@ -404,0 +555,0 @@ NETWORKS.forEach((network) => {

dist/cjs/exact/facilitator/index.d.ts

 import { SchemeNetworkFacilitator, PaymentPayload, PaymentRequirements, VerifyResponse, SettleResponse, Network } from '@x402/core/types';
-import { F as FacilitatorEvmSigner } from '../../signer-5OVDxViv.js';
+import { F as FacilitatorEvmSigner } from '../../signer-3KGwtdNT.js';
 import { x402Facilitator } from '@x402/core/facilitator';
@@ -4,0 +4,0 @@

dist/cjs/exact/facilitator/index.js

@@ -473,2 +473,3 @@ "use strict";
 // src/exact/facilitator/permit2.ts
+var import_extensions = require("@x402/extensions");
 var import_viem2 = require("viem");
@@ -599,9 +600,32 @@ var erc20AllowanceABI = [
     if (allowance < BigInt(requirements.amount)) {
-      return {
-        isValid: false,
-        invalidReason: "permit2_allowance_required",
-        payer
-      };
+      const eip2612Info = (0, import_extensions.extractEip2612GasSponsoringInfo)(payload);
+      if (eip2612Info) {
+        const validationResult = validateEip2612PermitForPayment(eip2612Info, payer, tokenAddress);
+        if (!validationResult.isValid) {
+          return {
+            isValid: false,
+            invalidReason: validationResult.invalidReason,
+            payer
+          };
+        }
+      } else {
+        return {
+          isValid: false,
+          invalidReason: "permit2_allowance_required",
+          payer
+        };
+      }
     }
   } catch {
+    const eip2612Info = (0, import_extensions.extractEip2612GasSponsoringInfo)(payload);
+    if (eip2612Info) {
+      const validationResult = validateEip2612PermitForPayment(eip2612Info, payer, tokenAddress);
+      if (!validationResult.isValid) {
+        return {
+          isValid: false,
+          invalidReason: validationResult.invalidReason,
+          payer
+        };
+      }
+    }
   }
@@ -644,24 +668,59 @@ try {
   try {
-    const tx = await signer.writeContract({
-      address: x402ExactPermit2ProxyAddress,
-      abi: x402ExactPermit2ProxyABI,
-      functionName: "settle",
-      args: [
-        {
-          permitted: {
-            token: (0, import_viem2.getAddress)(permit2Payload.permit2Authorization.permitted.token),
-            amount: BigInt(permit2Payload.permit2Authorization.permitted.amount)
+    const eip2612Info = (0, import_extensions.extractEip2612GasSponsoringInfo)(payload);
+    let tx;
+    if (eip2612Info) {
+      const { v, r, s } = splitEip2612Signature(eip2612Info.signature);
+      tx = await signer.writeContract({
+        address: x402ExactPermit2ProxyAddress,
+        abi: x402ExactPermit2ProxyABI,
+        functionName: "settleWithPermit",
+        args: [
+          {
+            value: BigInt(eip2612Info.amount),
+            deadline: BigInt(eip2612Info.deadline),
+            r,
+            s,
+            v
           },
-          nonce: BigInt(permit2Payload.permit2Authorization.nonce),
-          deadline: BigInt(permit2Payload.permit2Authorization.deadline)
-        },
-        (0, import_viem2.getAddress)(payer),
-        {
-          to: (0, import_viem2.getAddress)(permit2Payload.permit2Authorization.witness.to),
-          validAfter: BigInt(permit2Payload.permit2Authorization.witness.validAfter),
-          extra: permit2Payload.permit2Authorization.witness.extra
-        },
-        permit2Payload.signature
-      ]
-    });
+          {
+            permitted: {
+              token: (0, import_viem2.getAddress)(permit2Payload.permit2Authorization.permitted.token),
+              amount: BigInt(permit2Payload.permit2Authorization.permitted.amount)
+            },
+            nonce: BigInt(permit2Payload.permit2Authorization.nonce),
+            deadline: BigInt(permit2Payload.permit2Authorization.deadline)
+          },
+          (0, import_viem2.getAddress)(payer),
+          {
+            to: (0, import_viem2.getAddress)(permit2Payload.permit2Authorization.witness.to),
+            validAfter: BigInt(permit2Payload.permit2Authorization.witness.validAfter),
+            extra: permit2Payload.permit2Authorization.witness.extra
+          },
+          permit2Payload.signature
+        ]
+      });
+    } else {
+      tx = await signer.writeContract({
+        address: x402ExactPermit2ProxyAddress,
+        abi: x402ExactPermit2ProxyABI,
+        functionName: "settle",
+        args: [
+          {
+            permitted: {
+              token: (0, import_viem2.getAddress)(permit2Payload.permit2Authorization.permitted.token),
+              amount: BigInt(permit2Payload.permit2Authorization.permitted.amount)
+            },
+            nonce: BigInt(permit2Payload.permit2Authorization.nonce),
+            deadline: BigInt(permit2Payload.permit2Authorization.deadline)
+          },
+          (0, import_viem2.getAddress)(payer),
+          {
+            to: (0, import_viem2.getAddress)(permit2Payload.permit2Authorization.witness.to),
+            validAfter: BigInt(permit2Payload.permit2Authorization.witness.validAfter),
+            extra: permit2Payload.permit2Authorization.witness.extra
+          },
+          permit2Payload.signature
+        ]
+      });
+    }
     const receipt = await signer.waitForTransactionReceipt({ hash: tx });
@@ -712,2 +771,33 @@ if (receipt.status !== "success") {
 }
+function validateEip2612PermitForPayment(info, payer, tokenAddress) {
+  if (!(0, import_extensions.validateEip2612GasSponsoringInfo)(info)) {
+    return { isValid: false, invalidReason: "invalid_eip2612_extension_format" };
+  }
+  if ((0, import_viem2.getAddress)(info.from) !== (0, import_viem2.getAddress)(payer)) {
+    return { isValid: false, invalidReason: "eip2612_from_mismatch" };
+  }
+  if ((0, import_viem2.getAddress)(info.asset) !== tokenAddress) {
+    return { isValid: false, invalidReason: "eip2612_asset_mismatch" };
+  }
+  if ((0, import_viem2.getAddress)(info.spender) !== (0, import_viem2.getAddress)(PERMIT2_ADDRESS)) {
+    return { isValid: false, invalidReason: "eip2612_spender_not_permit2" };
+  }
+  const now = Math.floor(Date.now() / 1e3);
+  if (BigInt(info.deadline) < BigInt(now + 6)) {
+    return { isValid: false, invalidReason: "eip2612_deadline_expired" };
+  }
+  return { isValid: true };
+}
+function splitEip2612Signature(signature) {
+  const sig = signature.startsWith("0x") ? signature.slice(2) : signature;
+  if (sig.length !== 130) {
+    throw new Error(
+      `invalid EIP-2612 signature length: expected 65 bytes (130 hex chars), got ${sig.length / 2} bytes`
+    );
+  }
+  const r = `0x${sig.slice(0, 64)}`;
+  const s = `0x${sig.slice(64, 128)}`;
+  const v = parseInt(sig.slice(128, 130), 16);
+  return { v, r, s };
+}
 
@@ -714,0 +804,0 @@ // src/exact/facilitator/scheme.ts

dist/cjs/exact/v1/client/index.d.ts

 import { SchemeNetworkClient, PaymentRequirements, PaymentPayload, Network } from '@x402/core/types';
-import { C as ClientEvmSigner } from '../../../signer-5OVDxViv.js';
+import { C as ClientEvmSigner } from '../../../signer-3KGwtdNT.js';
 
@@ -4,0 +4,0 @@ /**

dist/cjs/exact/v1/client/index.js.map

@@ -1,1 +0,1 @@
-{"version":3,"sources":["../../../../../src/exact/v1/client/index.ts","../../../../../src/exact/v1/client/scheme.ts","../../../../../src/constants.ts","../../../../../src/utils.ts","../../../../../src/exact/v1/facilitator/scheme.ts","../../../../../src/v1/index.ts"],"sourcesContent":["export { ExactEvmSchemeV1 } from \"./scheme\";\n","import {\n  Network,\n  PaymentPayload,\n  PaymentRequirements,\n  SchemeNetworkClient,\n} from \"@x402/core/types\";\nimport { PaymentRequirementsV1 } from \"@x402/core/types/v1\";\nimport { getAddress } from \"viem\";\nimport { authorizationTypes } from \"../../../constants\";\nimport { ClientEvmSigner } from \"../../../signer\";\nimport { ExactEvmPayloadV1 } from \"../../../types\";\nimport { createNonce, getEvmChainId } from \"../../../utils\";\nimport { EvmNetworkV1 } from \"../../../v1\";\n\n/**\n * EVM client implementation for the Exact payment scheme (V1).\n */\nexport class ExactEvmSchemeV1 implements SchemeNetworkClient {\n  readonly scheme = \"exact\";\n\n  /**\n   * Creates a new ExactEvmClientV1 instance.\n   *\n   * @param signer - The EVM signer for client operations\n   */\n  constructor(private readonly signer: ClientEvmSigner) {}\n\n  /**\n   * Creates a payment payload for the Exact scheme (V1).\n   *\n   * @param x402Version - The x402 protocol version\n   * @param paymentRequirements - The payment requirements\n   * @returns Promise resolving to a payment payload\n   */\n  async createPaymentPayload(\n    x402Version: number,\n    paymentRequirements: PaymentRequirements,\n  ): Promise<\n    Pick<PaymentPayload, \"x402Version\" | \"payload\"> & { scheme: string; network: Network }\n  > {\n    const selectedV1 = paymentRequirements as unknown as PaymentRequirementsV1;\n    const nonce = createNonce();\n    const now = Math.floor(Date.now() / 1000);\n\n    const authorization: ExactEvmPayloadV1[\"authorization\"] = {\n      from: this.signer.address,\n      to: getAddress(selectedV1.payTo),\n      value: selectedV1.maxAmountRequired,\n      validAfter: (now - 600).toString(), // 10 minutes before\n      validBefore: (now + selectedV1.maxTimeoutSeconds).toString(),\n      nonce,\n    };\n\n    // Sign the authorization\n    const signature = await this.signAuthorization(authorization, selectedV1);\n\n    const payload: ExactEvmPayloadV1 = {\n      authorization,\n      signature,\n    };\n\n    return {\n      x402Version,\n      scheme: selectedV1.scheme,\n      network: selectedV1.network,\n      payload,\n    };\n  }\n\n  /**\n   * Sign the EIP-3009 authorization using EIP-712\n   *\n   * @param authorization - The authorization to sign\n   * @param requirements - The payment requirements\n   * @returns Promise resolving to the signature\n   */\n  private async signAuthorization(\n    authorization: ExactEvmPayloadV1[\"authorization\"],\n    requirements: PaymentRequirementsV1,\n  ): Promise<`0x${string}`> {\n    const chainId = getEvmChainId(requirements.network as EvmNetworkV1);\n\n    if (!requirements.extra?.name || !requirements.extra?.version) {\n      throw new Error(\n        `EIP-712 domain parameters (name, version) are required in payment requirements for asset ${requirements.asset}`,\n      );\n    }\n\n    const { name, version } = requirements.extra;\n\n    const domain = {\n      name,\n      version,\n      chainId,\n      verifyingContract: getAddress(requirements.asset),\n    };\n\n    const message = {\n      from: getAddress(authorization.from),\n      to: getAddress(authorization.to),\n      value: BigInt(authorization.value),\n      validAfter: BigInt(authorization.validAfter),\n      validBefore: BigInt(authorization.validBefore),\n      nonce: authorization.nonce,\n    };\n\n    return await this.signer.signTypedData({\n      domain,\n      types: authorizationTypes,\n      primaryType: \"TransferWithAuthorization\",\n      message,\n    });\n  }\n}\n","// EIP-3009 TransferWithAuthorization types for EIP-712 signing\nexport const authorizationTypes = {\n  TransferWithAuthorization: [\n    { name: \"from\", type: \"address\" },\n    { name: \"to\", type: \"address\" },\n    { name: \"value\", type: \"uint256\" },\n    { name: \"validAfter\", type: \"uint256\" },\n    { name: \"validBefore\", type: \"uint256\" },\n    { name: \"nonce\", type: \"bytes32\" },\n  ],\n} as const;\n\n/**\n * Permit2 EIP-712 types for signing PermitWitnessTransferFrom.\n * Must match the exact format expected by the Permit2 contract.\n * Note: Types must be in ALPHABETICAL order after the primary type (TokenPermissions < Witness).\n */\nexport const permit2WitnessTypes = {\n  PermitWitnessTransferFrom: [\n    { name: \"permitted\", type: \"TokenPermissions\" },\n    { name: \"spender\", type: \"address\" },\n    { name: \"nonce\", type: \"uint256\" },\n    { name: \"deadline\", type: \"uint256\" },\n    { name: \"witness\", type: \"Witness\" },\n  ],\n  TokenPermissions: [\n    { name: \"token\", type: \"address\" },\n    { name: \"amount\", type: \"uint256\" },\n  ],\n  Witness: [\n    { name: \"to\", type: \"address\" },\n    { name: \"validAfter\", type: \"uint256\" },\n    { name: \"extra\", type: \"bytes\" },\n  ],\n} as const;\n\n// EIP3009 ABI for transferWithAuthorization function\nexport const eip3009ABI = [\n  {\n    inputs: [\n      { name: \"from\", type: \"address\" },\n      { name: \"to\", type: \"address\" },\n      { name: \"value\", type: \"uint256\" },\n      { name: \"validAfter\", type: \"uint256\" },\n      { name: \"validBefore\", type: \"uint256\" },\n      { name: \"nonce\", type: \"bytes32\" },\n      { name: \"v\", type: \"uint8\" },\n      { name: \"r\", type: \"bytes32\" },\n      { name: \"s\", type: \"bytes32\" },\n    ],\n    name: \"transferWithAuthorization\",\n    outputs: [],\n    stateMutability: \"nonpayable\",\n    type: \"function\",\n  },\n  {\n    inputs: [\n      { name: \"from\", type: \"address\" },\n      { name: \"to\", type: \"address\" },\n      { name: \"value\", type: \"uint256\" },\n      { name: \"validAfter\", type: \"uint256\" },\n      { name: \"validBefore\", type: \"uint256\" },\n      { name: \"nonce\", type: \"bytes32\" },\n      { name: \"signature\", type: \"bytes\" },\n    ],\n    name: \"transferWithAuthorization\",\n    outputs: [],\n    stateMutability: \"nonpayable\",\n    type: \"function\",\n  },\n  {\n    inputs: [{ name: \"account\", type: \"address\" }],\n    name: \"balanceOf\",\n    outputs: [{ name: \"\", type: \"uint256\" }],\n    stateMutability: \"view\",\n    type: \"function\",\n  },\n  {\n    inputs: [],\n    name: \"version\",\n    outputs: [{ name: \"\", type: \"string\" }],\n    stateMutability: \"view\",\n    type: \"function\",\n  },\n] as const;\n\n/**\n * Canonical Permit2 contract address.\n * Same address on all EVM chains via CREATE2 deployment.\n *\n * @see https://github.com/Uniswap/permit2\n */\nexport const PERMIT2_ADDRESS = \"0x000000000022D473030F116dDEE9F6B43aC78BA3\" as const;\n\n/**\n * x402ExactPermit2Proxy contract address.\n * Vanity address: 0x4020...0001 for easy recognition.\n * This address is deterministic based on:\n * - Arachnid's deterministic deployer (0x4e59b44847b379578588920cA78FbF26c0B4956C)\n * - Vanity-mined salt for prefix 0x4020 and suffix 0001\n * - Contract bytecode + constructor args (PERMIT2_ADDRESS)\n */\nexport const x402ExactPermit2ProxyAddress = \"0x4020615294c913F045dc10f0a5cdEbd86c280001\" as const;\n\n/**\n * x402UptoPermit2Proxy contract address.\n * Vanity address: 0x4020...0002 for easy recognition.\n * This address is deterministic based on:\n * - Arachnid's deterministic deployer (0x4e59b44847b379578588920cA78FbF26c0B4956C)\n * - Vanity-mined salt for prefix 0x4020 and suffix 0002\n * - Contract bytecode + constructor args (PERMIT2_ADDRESS)\n */\nexport const x402UptoPermit2ProxyAddress = \"0x4020633461b2895a48930Ff97eE8fCdE8E520002\" as const;\n\n/**\n * x402UptoPermit2Proxy ABI - settle function for upto payment scheme (variable amounts).\n */\nexport const x402UptoPermit2ProxyABI = [\n  {\n    type: \"function\",\n    name: \"PERMIT2\",\n    inputs: [],\n    outputs: [{ name: \"\", type: \"address\", internalType: \"contract ISignatureTransfer\" }],\n    stateMutability: \"view\",\n  },\n  {\n    type: \"function\",\n    name: \"WITNESS_TYPEHASH\",\n    inputs: [],\n    outputs: [{ name: \"\", type: \"bytes32\", internalType: \"bytes32\" }],\n    stateMutability: \"view\",\n  },\n  {\n    type: \"function\",\n    name: \"WITNESS_TYPE_STRING\",\n    inputs: [],\n    outputs: [{ name: \"\", type: \"string\", internalType: \"string\" }],\n    stateMutability: \"view\",\n  },\n  {\n    type: \"function\",\n    name: \"initialize\",\n    inputs: [{ name: \"_permit2\", type: \"address\", internalType: \"address\" }],\n    outputs: [],\n    stateMutability: \"nonpayable\",\n  },\n  {\n    type: \"function\",\n    name: \"settle\",\n    inputs: [\n      {\n        name: \"permit\",\n        type: \"tuple\",\n        internalType: \"struct ISignatureTransfer.PermitTransferFrom\",\n        components: [\n          {\n            name: \"permitted\",\n            type: \"tuple\",\n            internalType: \"struct ISignatureTransfer.TokenPermissions\",\n            components: [\n              { name: \"token\", type: \"address\", internalType: \"address\" },\n              { name: \"amount\", type: \"uint256\", internalType: \"uint256\" },\n            ],\n          },\n          { name: \"nonce\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"deadline\", type: \"uint256\", internalType: \"uint256\" },\n        ],\n      },\n      { name: \"owner\", type: \"address\", internalType: \"address\" },\n      {\n        name: \"witness\",\n        type: \"tuple\",\n        internalType: \"struct x402BasePermit2Proxy.Witness\",\n        components: [\n          { name: \"to\", type: \"address\", internalType: \"address\" },\n          { name: \"validAfter\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"extra\", type: \"bytes\", internalType: \"bytes\" },\n        ],\n      },\n      { name: \"signature\", type: \"bytes\", internalType: \"bytes\" },\n    ],\n    outputs: [],\n    stateMutability: \"nonpayable\",\n  },\n  {\n    type: \"function\",\n    name: \"settleWithPermit\",\n    inputs: [\n      {\n        name: \"permit2612\",\n        type: \"tuple\",\n        internalType: \"struct x402BasePermit2Proxy.EIP2612Permit\",\n        components: [\n          { name: \"value\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"deadline\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"r\", type: \"bytes32\", internalType: \"bytes32\" },\n          { name: \"s\", type: \"bytes32\", internalType: \"bytes32\" },\n          { name: \"v\", type: \"uint8\", internalType: \"uint8\" },\n        ],\n      },\n      {\n        name: \"permit\",\n        type: \"tuple\",\n        internalType: \"struct ISignatureTransfer.PermitTransferFrom\",\n        components: [\n          {\n            name: \"permitted\",\n            type: \"tuple\",\n            internalType: \"struct ISignatureTransfer.TokenPermissions\",\n            components: [\n              { name: \"token\", type: \"address\", internalType: \"address\" },\n              { name: \"amount\", type: \"uint256\", internalType: \"uint256\" },\n            ],\n          },\n          { name: \"nonce\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"deadline\", type: \"uint256\", internalType: \"uint256\" },\n        ],\n      },\n      { name: \"owner\", type: \"address\", internalType: \"address\" },\n      {\n        name: \"witness\",\n        type: \"tuple\",\n        internalType: \"struct x402BasePermit2Proxy.Witness\",\n        components: [\n          { name: \"to\", type: \"address\", internalType: \"address\" },\n          { name: \"validAfter\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"extra\", type: \"bytes\", internalType: \"bytes\" },\n        ],\n      },\n      { name: \"signature\", type: \"bytes\", internalType: \"bytes\" },\n    ],\n    outputs: [],\n    stateMutability: \"nonpayable\",\n  },\n  { type: \"event\", name: \"Settled\", inputs: [], anonymous: false },\n  { type: \"event\", name: \"SettledWithPermit\", inputs: [], anonymous: false },\n  { type: \"error\", name: \"AlreadyInitialized\", inputs: [] },\n  { type: \"error\", name: \"AmountExceedsPermitted\", inputs: [] },\n  { type: \"error\", name: \"InvalidDestination\", inputs: [] },\n  { type: \"error\", name: \"InvalidOwner\", inputs: [] },\n  { type: \"error\", name: \"InvalidPermit2Address\", inputs: [] },\n  { type: \"error\", name: \"PaymentTooEarly\", inputs: [] },\n  { type: \"error\", name: \"ReentrancyGuardReentrantCall\", inputs: [] },\n] as const;\n\n/**\n * x402ExactPermit2Proxy ABI - settle function for exact payment scheme.\n */\nexport const x402ExactPermit2ProxyABI = [\n  {\n    type: \"function\",\n    name: \"PERMIT2\",\n    inputs: [],\n    outputs: [{ name: \"\", type: \"address\", internalType: \"contract ISignatureTransfer\" }],\n    stateMutability: \"view\",\n  },\n  {\n    type: \"function\",\n    name: \"WITNESS_TYPEHASH\",\n    inputs: [],\n    outputs: [{ name: \"\", type: \"bytes32\", internalType: \"bytes32\" }],\n    stateMutability: \"view\",\n  },\n  {\n    type: \"function\",\n    name: \"WITNESS_TYPE_STRING\",\n    inputs: [],\n    outputs: [{ name: \"\", type: \"string\", internalType: \"string\" }],\n    stateMutability: \"view\",\n  },\n  {\n    type: \"function\",\n    name: \"initialize\",\n    inputs: [{ name: \"_permit2\", type: \"address\", internalType: \"address\" }],\n    outputs: [],\n    stateMutability: \"nonpayable\",\n  },\n  {\n    type: \"function\",\n    name: \"settle\",\n    inputs: [\n      {\n        name: \"permit\",\n        type: \"tuple\",\n        internalType: \"struct ISignatureTransfer.PermitTransferFrom\",\n        components: [\n          {\n            name: \"permitted\",\n            type: \"tuple\",\n            internalType: \"struct ISignatureTransfer.TokenPermissions\",\n            components: [\n              { name: \"token\", type: \"address\", internalType: \"address\" },\n              { name: \"amount\", type: \"uint256\", internalType: \"uint256\" },\n            ],\n          },\n          { name: \"nonce\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"deadline\", type: \"uint256\", internalType: \"uint256\" },\n        ],\n      },\n      { name: \"owner\", type: \"address\", internalType: \"address\" },\n      {\n        name: \"witness\",\n        type: \"tuple\",\n        internalType: \"struct x402BasePermit2Proxy.Witness\",\n        components: [\n          { name: \"to\", type: \"address\", internalType: \"address\" },\n          { name: \"validAfter\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"extra\", type: \"bytes\", internalType: \"bytes\" },\n        ],\n      },\n      { name: \"signature\", type: \"bytes\", internalType: \"bytes\" },\n    ],\n    outputs: [],\n    stateMutability: \"nonpayable\",\n  },\n  {\n    type: \"function\",\n    name: \"settleWithPermit\",\n    inputs: [\n      {\n        name: \"permit2612\",\n        type: \"tuple\",\n        internalType: \"struct x402BasePermit2Proxy.EIP2612Permit\",\n        components: [\n          { name: \"value\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"deadline\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"r\", type: \"bytes32\", internalType: \"bytes32\" },\n          { name: \"s\", type: \"bytes32\", internalType: \"bytes32\" },\n          { name: \"v\", type: \"uint8\", internalType: \"uint8\" },\n        ],\n      },\n      {\n        name: \"permit\",\n        type: \"tuple\",\n        internalType: \"struct ISignatureTransfer.PermitTransferFrom\",\n        components: [\n          {\n            name: \"permitted\",\n            type: \"tuple\",\n            internalType: \"struct ISignatureTransfer.TokenPermissions\",\n            components: [\n              { name: \"token\", type: \"address\", internalType: \"address\" },\n              { name: \"amount\", type: \"uint256\", internalType: \"uint256\" },\n            ],\n          },\n          { name: \"nonce\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"deadline\", type: \"uint256\", internalType: \"uint256\" },\n        ],\n      },\n      { name: \"owner\", type: \"address\", internalType: \"address\" },\n      {\n        name: \"witness\",\n        type: \"tuple\",\n        internalType: \"struct x402BasePermit2Proxy.Witness\",\n        components: [\n          { name: \"to\", type: \"address\", internalType: \"address\" },\n          { name: \"validAfter\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"extra\", type: \"bytes\", internalType: \"bytes\" },\n        ],\n      },\n      { name: \"signature\", type: \"bytes\", internalType: \"bytes\" },\n    ],\n    outputs: [],\n    stateMutability: \"nonpayable\",\n  },\n  { type: \"event\", name: \"Settled\", inputs: [], anonymous: false },\n  { type: \"event\", name: \"SettledWithPermit\", inputs: [], anonymous: false },\n  { type: \"error\", name: \"AlreadyInitialized\", inputs: [] },\n  { type: \"error\", name: \"InvalidDestination\", inputs: [] },\n  { type: \"error\", name: \"InvalidOwner\", inputs: [] },\n  { type: \"error\", name: \"InvalidPermit2Address\", inputs: [] },\n  { type: \"error\", name: \"PaymentTooEarly\", inputs: [] },\n  { type: \"error\", name: \"ReentrancyGuardReentrantCall\", inputs: [] },\n] as const;\n","import { toHex } from \"viem\";\nimport { EVM_NETWORK_CHAIN_ID_MAP, EvmNetworkV1 } from \"./v1\";\n\n/**\n * Extract chain ID from network string (e.g., \"base-sepolia\" -> 84532)\n * Used by v1 implementations\n *\n * @param network - The network identifier\n * @returns The numeric chain ID\n * @throws Error if the network is not supported\n */\nexport function getEvmChainId(network: EvmNetworkV1): number {\n  const chainId = EVM_NETWORK_CHAIN_ID_MAP[network];\n  if (!chainId) {\n    throw new Error(`Unsupported network: ${network}`);\n  }\n  return chainId;\n}\n\n/**\n * Get the crypto object from the global scope.\n *\n * @returns The crypto object\n * @throws Error if crypto API is not available\n */\nfunction getCrypto(): Crypto {\n  const cryptoObj = globalThis.crypto as Crypto | undefined;\n  if (!cryptoObj) {\n    throw new Error(\"Crypto API not available\");\n  }\n  return cryptoObj;\n}\n\n/**\n * Create a random 32-byte nonce for EIP-3009 authorization.\n *\n * @returns A hex-encoded 32-byte nonce\n */\nexport function createNonce(): `0x${string}` {\n  return toHex(getCrypto().getRandomValues(new Uint8Array(32)));\n}\n\n/**\n * Creates a random 256-bit nonce for Permit2.\n * Permit2 uses uint256 nonces (not bytes32 like EIP-3009).\n *\n * @returns A string representation of the random nonce\n */\nexport function createPermit2Nonce(): string {\n  const randomBytes = getCrypto().getRandomValues(new Uint8Array(32));\n  return BigInt(toHex(randomBytes)).toString();\n}\n","import {\n  PaymentPayload,\n  PaymentPayloadV1,\n  PaymentRequirements,\n  SchemeNetworkFacilitator,\n  SettleResponse,\n  VerifyResponse,\n} from \"@x402/core/types\";\nimport { PaymentRequirementsV1 } from \"@x402/core/types/v1\";\nimport { getAddress, Hex, isAddressEqual, parseErc6492Signature, parseSignature } from \"viem\";\nimport { authorizationTypes, eip3009ABI } from \"../../../constants\";\nimport { FacilitatorEvmSigner } from \"../../../signer\";\nimport { ExactEvmPayloadV1 } from \"../../../types\";\nimport { getEvmChainId } from \"../../../utils\";\nimport { EvmNetworkV1 } from \"../../../v1\";\n\nexport interface ExactEvmSchemeV1Config {\n  /**\n   * If enabled, the facilitator will deploy ERC-4337 smart wallets\n   * via EIP-6492 when encountering undeployed contract signatures.\n   *\n   * @default false\n   */\n  deployERC4337WithEIP6492?: boolean;\n}\n\n/**\n * EVM facilitator implementation for the Exact payment scheme (V1).\n */\nexport class ExactEvmSchemeV1 implements SchemeNetworkFacilitator {\n  readonly scheme = \"exact\";\n  readonly caipFamily = \"eip155:*\";\n  private readonly config: Required<ExactEvmSchemeV1Config>;\n\n  /**\n   * Creates a new ExactEvmFacilitatorV1 instance.\n   *\n   * @param signer - The EVM signer for facilitator operations\n   * @param config - Optional configuration for the facilitator\n   */\n  constructor(\n    private readonly signer: FacilitatorEvmSigner,\n    config?: ExactEvmSchemeV1Config,\n  ) {\n    this.config = {\n      deployERC4337WithEIP6492: config?.deployERC4337WithEIP6492 ?? false,\n    };\n  }\n\n  /**\n   * Get mechanism-specific extra data for the supported kinds endpoint.\n   * For EVM, no extra data is needed.\n   *\n   * @param _ - The network identifier (unused for EVM)\n   * @returns undefined (EVM has no extra data)\n   */\n  getExtra(_: string): Record<string, unknown> | undefined {\n    return undefined;\n  }\n\n  /**\n   * Get signer addresses used by this facilitator.\n   * Returns all addresses this facilitator can use for signing/settling transactions.\n   *\n   * @param _ - The network identifier (unused for EVM, addresses are network-agnostic)\n   * @returns Array of facilitator wallet addresses\n   */\n  getSigners(_: string): string[] {\n    return [...this.signer.getAddresses()];\n  }\n\n  /**\n   * Verifies a payment payload (V1).\n   *\n   * @param payload - The payment payload to verify\n   * @param requirements - The payment requirements\n   * @returns Promise resolving to verification response\n   */\n  async verify(\n    payload: PaymentPayload,\n    requirements: PaymentRequirements,\n  ): Promise<VerifyResponse> {\n    const requirementsV1 = requirements as unknown as PaymentRequirementsV1;\n    const payloadV1 = payload as unknown as PaymentPayloadV1;\n    const exactEvmPayload = payload.payload as ExactEvmPayloadV1;\n\n    // Verify scheme matches\n    if (payloadV1.scheme !== \"exact\" || requirements.scheme !== \"exact\") {\n      return {\n        isValid: false,\n        invalidReason: \"unsupported_scheme\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    // Get chain configuration\n    let chainId: number;\n    try {\n      chainId = getEvmChainId(payloadV1.network as EvmNetworkV1);\n    } catch {\n      return {\n        isValid: false,\n        invalidReason: `invalid_network`,\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    if (!requirements.extra?.name || !requirements.extra?.version) {\n      return {\n        isValid: false,\n        invalidReason: \"missing_eip712_domain\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    const { name, version } = requirements.extra;\n    const erc20Address = getAddress(requirements.asset);\n\n    // Verify network matches\n    if (payloadV1.network !== requirements.network) {\n      return {\n        isValid: false,\n        invalidReason: \"network_mismatch\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    // Build typed data for signature verification\n    const permitTypedData = {\n      types: authorizationTypes,\n      primaryType: \"TransferWithAuthorization\" as const,\n      domain: {\n        name,\n        version,\n        chainId,\n        verifyingContract: erc20Address,\n      },\n      message: {\n        from: exactEvmPayload.authorization.from,\n        to: exactEvmPayload.authorization.to,\n        value: BigInt(exactEvmPayload.authorization.value),\n        validAfter: BigInt(exactEvmPayload.authorization.validAfter),\n        validBefore: BigInt(exactEvmPayload.authorization.validBefore),\n        nonce: exactEvmPayload.authorization.nonce,\n      },\n    };\n\n    // Verify signature\n    try {\n      const recoveredAddress = await this.signer.verifyTypedData({\n        address: exactEvmPayload.authorization.from,\n        ...permitTypedData,\n        signature: exactEvmPayload.signature!,\n      });\n\n      if (!recoveredAddress) {\n        return {\n          isValid: false,\n          invalidReason: \"invalid_exact_evm_payload_signature\",\n          payer: exactEvmPayload.authorization.from,\n        };\n      }\n    } catch {\n      // Signature verification failed - could be an undeployed smart wallet\n      // Check if smart wallet is deployed\n      const signature = exactEvmPayload.signature!;\n      const signatureLength = signature.startsWith(\"0x\") ? signature.length - 2 : signature.length;\n      const isSmartWallet = signatureLength > 130; // 65 bytes = 130 hex chars for EOA\n\n      if (isSmartWallet) {\n        const payerAddress = exactEvmPayload.authorization.from;\n        const bytecode = await this.signer.getCode({ address: payerAddress });\n\n        if (!bytecode || bytecode === \"0x\") {\n          // Wallet is not deployed. Check if it's EIP-6492 with deployment info.\n          // EIP-6492 signatures contain factory address and calldata needed for deployment.\n          // Non-EIP-6492 undeployed wallets cannot succeed (no way to deploy them).\n          const erc6492Data = parseErc6492Signature(signature);\n          const hasDeploymentInfo =\n            erc6492Data.address &&\n            erc6492Data.data &&\n            !isAddressEqual(erc6492Data.address, \"0x0000000000000000000000000000000000000000\");\n\n          if (!hasDeploymentInfo) {\n            // Non-EIP-6492 undeployed smart wallet - will always fail at settlement\n            // since EIP-3009 requires on-chain EIP-1271 validation\n            return {\n              isValid: false,\n              invalidReason: \"invalid_exact_evm_payload_undeployed_smart_wallet\",\n              payer: payerAddress,\n            };\n          }\n          // EIP-6492 signature with deployment info - allow through\n          // Facilitators with sponsored deployment support can handle this in settle()\n        } else {\n          // Wallet is deployed but signature still failed - invalid signature\n          return {\n            isValid: false,\n            invalidReason: \"invalid_exact_evm_payload_signature\",\n            payer: exactEvmPayload.authorization.from,\n          };\n        }\n      } else {\n        // EOA signature failed\n        return {\n          isValid: false,\n          invalidReason: \"invalid_exact_evm_payload_signature\",\n          payer: exactEvmPayload.authorization.from,\n        };\n      }\n    }\n\n    // Verify payment recipient matches\n    if (getAddress(exactEvmPayload.authorization.to) !== getAddress(requirements.payTo)) {\n      return {\n        isValid: false,\n        invalidReason: \"invalid_exact_evm_payload_recipient_mismatch\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    // Verify validBefore is in the future (with 6 second buffer for block time)\n    const now = Math.floor(Date.now() / 1000);\n    if (BigInt(exactEvmPayload.authorization.validBefore) < BigInt(now + 6)) {\n      return {\n        isValid: false,\n        invalidReason: \"invalid_exact_evm_payload_authorization_valid_before\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    // Verify validAfter is not in the future\n    if (BigInt(exactEvmPayload.authorization.validAfter) > BigInt(now)) {\n      return {\n        isValid: false,\n        invalidReason: \"invalid_exact_evm_payload_authorization_valid_after\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    // Check balance\n    try {\n      const balance = (await this.signer.readContract({\n        address: erc20Address,\n        abi: eip3009ABI,\n        functionName: \"balanceOf\",\n        args: [exactEvmPayload.authorization.from],\n      })) as bigint;\n\n      if (BigInt(balance) < BigInt(requirementsV1.maxAmountRequired)) {\n        return {\n          isValid: false,\n          invalidReason: \"insufficient_funds\",\n          invalidMessage: `Insufficient funds to complete the payment. Required: ${requirementsV1.maxAmountRequired} ${requirements.asset}, Available: ${balance.toString()} ${requirements.asset}. Please add funds to your wallet and try again.`,\n          payer: exactEvmPayload.authorization.from,\n        };\n      }\n    } catch {\n      // If we can't check balance, continue with other validations\n    }\n\n    // Verify amount is sufficient\n    if (BigInt(exactEvmPayload.authorization.value) < BigInt(requirementsV1.maxAmountRequired)) {\n      return {\n        isValid: false,\n        invalidReason: \"invalid_exact_evm_payload_authorization_value\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    return {\n      isValid: true,\n      invalidReason: undefined,\n      payer: exactEvmPayload.authorization.from,\n    };\n  }\n\n  /**\n   * Settles a payment by executing the transfer (V1).\n   *\n   * @param payload - The payment payload to settle\n   * @param requirements - The payment requirements\n   * @returns Promise resolving to settlement response\n   */\n  async settle(\n    payload: PaymentPayload,\n    requirements: PaymentRequirements,\n  ): Promise<SettleResponse> {\n    const payloadV1 = payload as unknown as PaymentPayloadV1;\n    const exactEvmPayload = payload.payload as ExactEvmPayloadV1;\n\n    // Re-verify before settling\n    const valid = await this.verify(payload, requirements);\n    if (!valid.isValid) {\n      return {\n        success: false,\n        network: payloadV1.network,\n        transaction: \"\",\n        errorReason: valid.invalidReason ?? \"invalid_scheme\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    try {\n      // Parse ERC-6492 signature if applicable\n      const parseResult = parseErc6492Signature(exactEvmPayload.signature!);\n      const { signature, address: factoryAddress, data: factoryCalldata } = parseResult;\n\n      // Deploy ERC-4337 smart wallet via EIP-6492 if configured and needed\n      if (\n        this.config.deployERC4337WithEIP6492 &&\n        factoryAddress &&\n        factoryCalldata &&\n        !isAddressEqual(factoryAddress, \"0x0000000000000000000000000000000000000000\")\n      ) {\n        // Check if smart wallet is already deployed\n        const payerAddress = exactEvmPayload.authorization.from;\n        const bytecode = await this.signer.getCode({ address: payerAddress });\n\n        if (!bytecode || bytecode === \"0x\") {\n          // Wallet not deployed - attempt deployment\n          try {\n            console.log(`Deploying ERC-4337 smart wallet for ${payerAddress} via EIP-6492`);\n\n            // Send the factory calldata directly as a transaction\n            // The factoryCalldata already contains the complete encoded function call\n            const deployTx = await this.signer.sendTransaction({\n              to: factoryAddress as Hex,\n              data: factoryCalldata as Hex,\n            });\n\n            // Wait for deployment transaction\n            await this.signer.waitForTransactionReceipt({ hash: deployTx });\n            console.log(`Successfully deployed smart wallet for ${payerAddress}`);\n          } catch (deployError) {\n            console.error(\"Smart wallet deployment failed:\", deployError);\n            // Deployment failed - cannot proceed\n            throw deployError;\n          }\n        } else {\n          console.log(`Smart wallet for ${payerAddress} already deployed, skipping deployment`);\n        }\n      }\n\n      // Determine if this is an ECDSA signature (EOA) or smart wallet signature\n      // ECDSA signatures are exactly 65 bytes (130 hex chars without 0x)\n      const signatureLength = signature.startsWith(\"0x\") ? signature.length - 2 : signature.length;\n      const isECDSA = signatureLength === 130;\n\n      let tx: Hex;\n      if (isECDSA) {\n        // For EOA wallets, parse signature into v, r, s and use that overload\n        const parsedSig = parseSignature(signature);\n\n        tx = await this.signer.writeContract({\n          address: getAddress(requirements.asset),\n          abi: eip3009ABI,\n          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getAddress(exactEvmPayload.authorization.from),\n            getAddress(exactEvmPayload.authorization.to),\n            BigInt(exactEvmPayload.authorization.value),\n            BigInt(exactEvmPayload.authorization.validAfter),\n            BigInt(exactEvmPayload.authorization.validBefore),\n            exactEvmPayload.authorization.nonce,\n            signature,\n          ],\n        });\n      }\n\n      // Wait for transaction confirmation\n      const receipt = await this.signer.waitForTransactionReceipt({ hash: tx });\n\n      if (receipt.status !== \"success\") {\n        return {\n          success: false,\n          errorReason: \"invalid_transaction_state\",\n          transaction: tx,\n          network: payloadV1.network,\n          payer: exactEvmPayload.authorization.from,\n        };\n      }\n\n      return {\n        success: true,\n        transaction: tx,\n        network: payloadV1.network,\n        payer: exactEvmPayload.authorization.from,\n      };\n    } catch 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+{"version":3,"sources":["../../../../../src/exact/v1/client/index.ts","../../../../../src/exact/v1/client/scheme.ts","../../../../../src/constants.ts","../../../../../src/utils.ts","../../../../../src/exact/v1/facilitator/scheme.ts","../../../../../src/v1/index.ts"],"sourcesContent":["export { ExactEvmSchemeV1 } from \"./scheme\";\n","import {\n  Network,\n  PaymentPayload,\n  PaymentRequirements,\n  SchemeNetworkClient,\n} from \"@x402/core/types\";\nimport { PaymentRequirementsV1 } from \"@x402/core/types/v1\";\nimport { getAddress } from \"viem\";\nimport { authorizationTypes } from \"../../../constants\";\nimport { ClientEvmSigner } from \"../../../signer\";\nimport { ExactEvmPayloadV1 } from \"../../../types\";\nimport { createNonce, getEvmChainId } from \"../../../utils\";\nimport { EvmNetworkV1 } from \"../../../v1\";\n\n/**\n * EVM client implementation for the Exact payment scheme (V1).\n */\nexport class ExactEvmSchemeV1 implements SchemeNetworkClient {\n  readonly scheme = \"exact\";\n\n  /**\n   * Creates a new ExactEvmClientV1 instance.\n   *\n   * @param signer - The EVM signer for client operations\n   */\n  constructor(private readonly signer: ClientEvmSigner) {}\n\n  /**\n   * Creates a payment payload for the Exact scheme (V1).\n   *\n   * @param x402Version - The x402 protocol version\n   * @param paymentRequirements - The payment requirements\n   * @returns Promise resolving to a payment payload\n   */\n  async createPaymentPayload(\n    x402Version: number,\n    paymentRequirements: PaymentRequirements,\n  ): Promise<\n    Pick<PaymentPayload, \"x402Version\" | \"payload\"> & { scheme: string; network: Network }\n  > {\n    const selectedV1 = paymentRequirements as unknown as PaymentRequirementsV1;\n    const nonce = createNonce();\n    const now = Math.floor(Date.now() / 1000);\n\n    const authorization: ExactEvmPayloadV1[\"authorization\"] = {\n      from: this.signer.address,\n      to: getAddress(selectedV1.payTo),\n      value: selectedV1.maxAmountRequired,\n      validAfter: (now - 600).toString(), // 10 minutes before\n      validBefore: (now + selectedV1.maxTimeoutSeconds).toString(),\n      nonce,\n    };\n\n    // Sign the authorization\n    const signature = await this.signAuthorization(authorization, selectedV1);\n\n    const payload: ExactEvmPayloadV1 = {\n      authorization,\n      signature,\n    };\n\n    return {\n      x402Version,\n      scheme: selectedV1.scheme,\n      network: selectedV1.network,\n      payload,\n    };\n  }\n\n  /**\n   * Sign the EIP-3009 authorization using EIP-712\n   *\n   * @param authorization - The authorization to sign\n   * @param requirements - The payment requirements\n   * @returns Promise resolving to the signature\n   */\n  private async signAuthorization(\n    authorization: ExactEvmPayloadV1[\"authorization\"],\n    requirements: PaymentRequirementsV1,\n  ): Promise<`0x${string}`> {\n    const chainId = getEvmChainId(requirements.network as EvmNetworkV1);\n\n    if (!requirements.extra?.name || !requirements.extra?.version) {\n      throw new Error(\n        `EIP-712 domain parameters (name, version) are required in payment requirements for asset ${requirements.asset}`,\n      );\n    }\n\n    const { name, version } = requirements.extra;\n\n    const domain = {\n      name,\n      version,\n      chainId,\n      verifyingContract: getAddress(requirements.asset),\n    };\n\n    const message = {\n      from: getAddress(authorization.from),\n      to: getAddress(authorization.to),\n      value: BigInt(authorization.value),\n      validAfter: BigInt(authorization.validAfter),\n      validBefore: BigInt(authorization.validBefore),\n      nonce: authorization.nonce,\n    };\n\n    return await this.signer.signTypedData({\n      domain,\n      types: authorizationTypes,\n      primaryType: \"TransferWithAuthorization\",\n      message,\n    });\n  }\n}\n","// EIP-3009 TransferWithAuthorization types for EIP-712 signing\nexport const authorizationTypes = {\n  TransferWithAuthorization: [\n    { name: \"from\", type: \"address\" },\n    { name: \"to\", type: \"address\" },\n    { name: \"value\", type: \"uint256\" },\n    { name: \"validAfter\", type: \"uint256\" },\n    { name: \"validBefore\", type: \"uint256\" },\n    { name: \"nonce\", type: \"bytes32\" },\n  ],\n} as const;\n\n/**\n * Permit2 EIP-712 types for signing PermitWitnessTransferFrom.\n * Must match the exact format expected by the Permit2 contract.\n * Note: Types must be in ALPHABETICAL order after the primary type (TokenPermissions < Witness).\n */\nexport const permit2WitnessTypes = {\n  PermitWitnessTransferFrom: [\n    { name: \"permitted\", type: \"TokenPermissions\" },\n    { name: \"spender\", type: \"address\" },\n    { name: \"nonce\", type: \"uint256\" },\n    { name: \"deadline\", type: \"uint256\" },\n    { name: \"witness\", type: \"Witness\" },\n  ],\n  TokenPermissions: [\n    { name: \"token\", type: \"address\" },\n    { name: \"amount\", type: \"uint256\" },\n  ],\n  Witness: [\n    { name: \"to\", type: \"address\" },\n    { name: \"validAfter\", type: \"uint256\" },\n    { name: \"extra\", type: \"bytes\" },\n  ],\n} as const;\n\n// EIP3009 ABI for transferWithAuthorization function\nexport const eip3009ABI = [\n  {\n    inputs: [\n      { name: \"from\", type: \"address\" },\n      { name: \"to\", type: \"address\" },\n      { name: \"value\", type: \"uint256\" },\n      { name: \"validAfter\", type: \"uint256\" },\n      { name: \"validBefore\", type: \"uint256\" },\n      { name: \"nonce\", type: \"bytes32\" },\n      { name: \"v\", type: \"uint8\" },\n      { name: \"r\", type: \"bytes32\" },\n      { name: \"s\", type: \"bytes32\" },\n    ],\n    name: \"transferWithAuthorization\",\n    outputs: [],\n    stateMutability: \"nonpayable\",\n    type: \"function\",\n  },\n  {\n    inputs: [\n      { name: \"from\", type: \"address\" },\n      { name: \"to\", type: \"address\" },\n      { name: \"value\", type: \"uint256\" },\n      { name: \"validAfter\", type: \"uint256\" },\n      { name: \"validBefore\", type: \"uint256\" },\n      { name: \"nonce\", type: \"bytes32\" },\n      { name: \"signature\", type: \"bytes\" },\n    ],\n    name: \"transferWithAuthorization\",\n    outputs: [],\n    stateMutability: \"nonpayable\",\n    type: \"function\",\n  },\n  {\n    inputs: [{ name: \"account\", type: \"address\" }],\n    name: \"balanceOf\",\n    outputs: [{ name: \"\", type: \"uint256\" }],\n    stateMutability: \"view\",\n    type: \"function\",\n  },\n  {\n    inputs: [],\n    name: \"version\",\n    outputs: [{ name: \"\", type: \"string\" }],\n    stateMutability: \"view\",\n    type: \"function\",\n  },\n] as const;\n\n/**\n * EIP-2612 Permit EIP-712 types for signing token.permit().\n */\nexport const eip2612PermitTypes = {\n  Permit: [\n    { name: \"owner\", type: \"address\" },\n    { name: \"spender\", type: \"address\" },\n    { name: \"value\", type: \"uint256\" },\n    { name: \"nonce\", type: \"uint256\" },\n    { name: \"deadline\", type: \"uint256\" },\n  ],\n} as const;\n\n/**\n * EIP-2612 nonces ABI for querying current nonce.\n */\nexport const eip2612NoncesAbi = [\n  {\n    type: \"function\",\n    name: \"nonces\",\n    inputs: [{ name: \"owner\", type: \"address\" }],\n    outputs: [{ type: \"uint256\" }],\n    stateMutability: \"view\",\n  },\n] as const;\n\n/**\n * Canonical Permit2 contract address.\n * Same address on all EVM chains via CREATE2 deployment.\n *\n * @see https://github.com/Uniswap/permit2\n */\nexport const PERMIT2_ADDRESS = \"0x000000000022D473030F116dDEE9F6B43aC78BA3\" as const;\n\n/**\n * x402ExactPermit2Proxy contract address.\n * Vanity address: 0x4020...0001 for easy recognition.\n * This address is deterministic based on:\n * - Arachnid's deterministic deployer (0x4e59b44847b379578588920cA78FbF26c0B4956C)\n * - Vanity-mined salt for prefix 0x4020 and suffix 0001\n * - Contract bytecode + constructor args (PERMIT2_ADDRESS)\n */\nexport const x402ExactPermit2ProxyAddress = \"0x4020615294c913F045dc10f0a5cdEbd86c280001\" as const;\n\n/**\n * x402UptoPermit2Proxy contract address.\n * Vanity address: 0x4020...0002 for easy recognition.\n * This address is deterministic based on:\n * - Arachnid's deterministic deployer (0x4e59b44847b379578588920cA78FbF26c0B4956C)\n * - Vanity-mined salt for prefix 0x4020 and suffix 0002\n * - Contract bytecode + constructor args (PERMIT2_ADDRESS)\n */\nexport const x402UptoPermit2ProxyAddress = \"0x4020633461b2895a48930Ff97eE8fCdE8E520002\" as const;\n\n/**\n * x402UptoPermit2Proxy ABI - settle function for upto payment scheme (variable amounts).\n */\nexport const x402UptoPermit2ProxyABI = [\n  {\n    type: \"function\",\n    name: \"PERMIT2\",\n    inputs: [],\n    outputs: [{ name: \"\", type: \"address\", internalType: \"contract ISignatureTransfer\" }],\n    stateMutability: \"view\",\n  },\n  {\n    type: \"function\",\n    name: \"WITNESS_TYPEHASH\",\n    inputs: [],\n    outputs: [{ name: \"\", type: \"bytes32\", internalType: \"bytes32\" }],\n    stateMutability: \"view\",\n  },\n  {\n    type: \"function\",\n    name: \"WITNESS_TYPE_STRING\",\n    inputs: [],\n    outputs: [{ name: \"\", type: \"string\", internalType: \"string\" }],\n    stateMutability: \"view\",\n  },\n  {\n    type: \"function\",\n    name: \"initialize\",\n    inputs: [{ name: \"_permit2\", type: \"address\", internalType: \"address\" }],\n    outputs: [],\n    stateMutability: \"nonpayable\",\n  },\n  {\n    type: \"function\",\n    name: \"settle\",\n    inputs: [\n      {\n        name: \"permit\",\n        type: \"tuple\",\n        internalType: \"struct ISignatureTransfer.PermitTransferFrom\",\n        components: [\n          {\n            name: \"permitted\",\n            type: \"tuple\",\n            internalType: \"struct ISignatureTransfer.TokenPermissions\",\n            components: [\n              { name: \"token\", type: \"address\", internalType: \"address\" },\n              { name: \"amount\", type: \"uint256\", internalType: \"uint256\" },\n            ],\n          },\n          { name: \"nonce\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"deadline\", type: \"uint256\", internalType: \"uint256\" },\n        ],\n      },\n      { name: \"owner\", type: \"address\", internalType: \"address\" },\n      {\n        name: \"witness\",\n        type: \"tuple\",\n        internalType: \"struct x402BasePermit2Proxy.Witness\",\n        components: [\n          { name: \"to\", type: \"address\", internalType: \"address\" },\n          { name: \"validAfter\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"extra\", type: \"bytes\", internalType: \"bytes\" },\n        ],\n      },\n      { name: \"signature\", type: \"bytes\", internalType: \"bytes\" },\n    ],\n    outputs: [],\n    stateMutability: \"nonpayable\",\n  },\n  {\n    type: \"function\",\n    name: 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[{ name: \"\", type: \"bytes32\", internalType: \"bytes32\" }],\n    stateMutability: \"view\",\n  },\n  {\n    type: \"function\",\n    name: \"WITNESS_TYPE_STRING\",\n    inputs: [],\n    outputs: [{ name: \"\", type: \"string\", internalType: \"string\" }],\n    stateMutability: \"view\",\n  },\n  {\n    type: \"function\",\n    name: \"initialize\",\n    inputs: [{ name: \"_permit2\", type: \"address\", internalType: \"address\" }],\n    outputs: [],\n    stateMutability: \"nonpayable\",\n  },\n  {\n    type: \"function\",\n    name: \"settle\",\n    inputs: [\n      {\n        name: \"permit\",\n        type: \"tuple\",\n        internalType: \"struct ISignatureTransfer.PermitTransferFrom\",\n        components: [\n          {\n            name: \"permitted\",\n            type: \"tuple\",\n            internalType: \"struct ISignatureTransfer.TokenPermissions\",\n            components: [\n              { name: \"token\", type: \"address\", internalType: \"address\" },\n              { name: \"amount\", type: \"uint256\", internalType: \"uint256\" },\n            ],\n          },\n          { name: \"nonce\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"deadline\", type: \"uint256\", internalType: \"uint256\" },\n        ],\n      },\n      { name: \"owner\", type: \"address\", internalType: \"address\" },\n      {\n        name: \"witness\",\n        type: \"tuple\",\n        internalType: \"struct x402BasePermit2Proxy.Witness\",\n        components: [\n          { name: \"to\", type: \"address\", internalType: \"address\" },\n          { name: \"validAfter\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"extra\", type: \"bytes\", internalType: \"bytes\" },\n        ],\n      },\n      { name: \"signature\", type: \"bytes\", internalType: \"bytes\" },\n    ],\n    outputs: [],\n    stateMutability: \"nonpayable\",\n  },\n  {\n    type: \"function\",\n    name: \"settleWithPermit\",\n    inputs: [\n      {\n        name: \"permit2612\",\n        type: \"tuple\",\n        internalType: \"struct x402BasePermit2Proxy.EIP2612Permit\",\n        components: [\n          { name: \"value\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"deadline\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"r\", type: \"bytes32\", internalType: \"bytes32\" },\n          { name: \"s\", type: \"bytes32\", internalType: \"bytes32\" },\n          { name: \"v\", type: \"uint8\", internalType: \"uint8\" },\n        ],\n      },\n      {\n        name: \"permit\",\n        type: \"tuple\",\n        internalType: \"struct ISignatureTransfer.PermitTransferFrom\",\n        components: [\n          {\n            name: \"permitted\",\n            type: \"tuple\",\n            internalType: \"struct ISignatureTransfer.TokenPermissions\",\n            components: [\n              { name: \"token\", type: \"address\", internalType: \"address\" },\n              { name: \"amount\", type: \"uint256\", internalType: \"uint256\" },\n            ],\n          },\n          { name: \"nonce\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"deadline\", type: \"uint256\", internalType: \"uint256\" },\n        ],\n      },\n      { name: \"owner\", type: \"address\", internalType: \"address\" },\n      {\n        name: \"witness\",\n        type: \"tuple\",\n        internalType: \"struct x402BasePermit2Proxy.Witness\",\n        components: [\n          { name: \"to\", type: \"address\", internalType: \"address\" },\n          { name: \"validAfter\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"extra\", type: \"bytes\", internalType: \"bytes\" },\n        ],\n      },\n      { name: \"signature\", type: \"bytes\", internalType: \"bytes\" },\n    ],\n    outputs: [],\n    stateMutability: \"nonpayable\",\n  },\n  { type: \"event\", name: \"Settled\", inputs: [], anonymous: false },\n  { type: \"event\", name: \"SettledWithPermit\", inputs: [], anonymous: false },\n  { type: \"error\", name: \"AlreadyInitialized\", inputs: [] },\n  { type: \"error\", name: \"InvalidDestination\", inputs: [] },\n  { type: \"error\", name: \"InvalidOwner\", inputs: [] },\n  { type: \"error\", name: \"InvalidPermit2Address\", inputs: [] },\n  { type: \"error\", name: \"PaymentTooEarly\", inputs: [] },\n  { type: \"error\", name: \"ReentrancyGuardReentrantCall\", inputs: [] },\n] as const;\n","import { toHex } from \"viem\";\nimport { EVM_NETWORK_CHAIN_ID_MAP, EvmNetworkV1 } from \"./v1\";\n\n/**\n * Extract chain ID from network string (e.g., \"base-sepolia\" -> 84532)\n * Used by v1 implementations\n *\n * @param network - The network identifier\n * @returns The numeric chain ID\n * @throws Error if the network is not supported\n */\nexport function getEvmChainId(network: EvmNetworkV1): number {\n  const chainId = EVM_NETWORK_CHAIN_ID_MAP[network];\n  if (!chainId) {\n    throw new Error(`Unsupported network: ${network}`);\n  }\n  return chainId;\n}\n\n/**\n * Get the crypto object from the global scope.\n *\n * @returns The crypto object\n * @throws Error if crypto API is not available\n */\nfunction getCrypto(): Crypto {\n  const cryptoObj = globalThis.crypto as Crypto | undefined;\n  if (!cryptoObj) {\n    throw new Error(\"Crypto API not available\");\n  }\n  return cryptoObj;\n}\n\n/**\n * Create a random 32-byte nonce for EIP-3009 authorization.\n *\n * @returns A hex-encoded 32-byte nonce\n */\nexport function createNonce(): `0x${string}` {\n  return toHex(getCrypto().getRandomValues(new Uint8Array(32)));\n}\n\n/**\n * Creates a random 256-bit nonce for Permit2.\n * Permit2 uses uint256 nonces (not bytes32 like EIP-3009).\n *\n * @returns A string representation of the random nonce\n */\nexport function createPermit2Nonce(): string {\n  const randomBytes = getCrypto().getRandomValues(new Uint8Array(32));\n  return BigInt(toHex(randomBytes)).toString();\n}\n","import {\n  PaymentPayload,\n  PaymentPayloadV1,\n  PaymentRequirements,\n  SchemeNetworkFacilitator,\n  SettleResponse,\n  VerifyResponse,\n} from \"@x402/core/types\";\nimport { PaymentRequirementsV1 } from \"@x402/core/types/v1\";\nimport { getAddress, Hex, isAddressEqual, parseErc6492Signature, parseSignature } from \"viem\";\nimport { authorizationTypes, eip3009ABI } from \"../../../constants\";\nimport { FacilitatorEvmSigner } from \"../../../signer\";\nimport { ExactEvmPayloadV1 } from \"../../../types\";\nimport { getEvmChainId } from \"../../../utils\";\nimport { EvmNetworkV1 } from \"../../../v1\";\n\nexport interface ExactEvmSchemeV1Config {\n  /**\n   * If enabled, the facilitator will deploy ERC-4337 smart wallets\n   * via EIP-6492 when encountering undeployed contract signatures.\n   *\n   * @default false\n   */\n  deployERC4337WithEIP6492?: boolean;\n}\n\n/**\n * EVM facilitator implementation for the Exact payment scheme (V1).\n */\nexport class ExactEvmSchemeV1 implements SchemeNetworkFacilitator {\n  readonly scheme = \"exact\";\n  readonly caipFamily = \"eip155:*\";\n  private readonly config: Required<ExactEvmSchemeV1Config>;\n\n  /**\n   * Creates a new ExactEvmFacilitatorV1 instance.\n   *\n   * @param signer - The EVM signer for facilitator operations\n   * @param config - Optional configuration for the facilitator\n   */\n  constructor(\n    private readonly signer: FacilitatorEvmSigner,\n    config?: ExactEvmSchemeV1Config,\n  ) {\n    this.config = {\n      deployERC4337WithEIP6492: config?.deployERC4337WithEIP6492 ?? false,\n    };\n  }\n\n  /**\n   * Get mechanism-specific extra data for the supported kinds endpoint.\n   * For EVM, no extra data is needed.\n   *\n   * @param _ - The network identifier (unused for EVM)\n   * @returns undefined (EVM has no extra data)\n   */\n  getExtra(_: string): Record<string, unknown> | undefined {\n    return undefined;\n  }\n\n  /**\n   * Get signer addresses used by this facilitator.\n   * Returns all addresses this facilitator can use for signing/settling transactions.\n   *\n   * @param _ - The network identifier (unused for EVM, addresses are network-agnostic)\n   * @returns Array of facilitator wallet addresses\n   */\n  getSigners(_: string): string[] {\n    return [...this.signer.getAddresses()];\n  }\n\n  /**\n   * Verifies a payment payload (V1).\n   *\n   * @param payload - The payment payload to verify\n   * @param requirements - The payment requirements\n   * @returns Promise resolving to verification response\n   */\n  async verify(\n    payload: PaymentPayload,\n    requirements: PaymentRequirements,\n  ): Promise<VerifyResponse> {\n    const requirementsV1 = requirements as unknown as PaymentRequirementsV1;\n    const payloadV1 = payload as unknown as PaymentPayloadV1;\n    const exactEvmPayload = payload.payload as ExactEvmPayloadV1;\n\n    // Verify scheme matches\n    if (payloadV1.scheme !== \"exact\" || requirements.scheme !== \"exact\") {\n      return {\n        isValid: false,\n        invalidReason: \"unsupported_scheme\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    // Get chain configuration\n    let chainId: number;\n    try {\n      chainId = getEvmChainId(payloadV1.network as EvmNetworkV1);\n    } catch {\n      return {\n        isValid: false,\n        invalidReason: `invalid_network`,\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    if (!requirements.extra?.name || !requirements.extra?.version) {\n      return {\n        isValid: false,\n        invalidReason: \"missing_eip712_domain\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    const { name, version } = requirements.extra;\n    const erc20Address = getAddress(requirements.asset);\n\n    // Verify network matches\n    if (payloadV1.network !== requirements.network) {\n      return {\n        isValid: false,\n        invalidReason: \"network_mismatch\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    // Build typed data for signature verification\n    const permitTypedData = {\n      types: authorizationTypes,\n      primaryType: \"TransferWithAuthorization\" as const,\n      domain: {\n        name,\n        version,\n        chainId,\n        verifyingContract: erc20Address,\n      },\n      message: {\n        from: exactEvmPayload.authorization.from,\n        to: exactEvmPayload.authorization.to,\n        value: BigInt(exactEvmPayload.authorization.value),\n        validAfter: BigInt(exactEvmPayload.authorization.validAfter),\n        validBefore: BigInt(exactEvmPayload.authorization.validBefore),\n        nonce: exactEvmPayload.authorization.nonce,\n      },\n    };\n\n    // Verify signature\n    try {\n      const recoveredAddress = await this.signer.verifyTypedData({\n        address: exactEvmPayload.authorization.from,\n        ...permitTypedData,\n        signature: exactEvmPayload.signature!,\n      });\n\n      if (!recoveredAddress) {\n        return {\n          isValid: false,\n          invalidReason: \"invalid_exact_evm_payload_signature\",\n          payer: exactEvmPayload.authorization.from,\n        };\n      }\n    } catch {\n      // Signature verification failed - could be an undeployed smart wallet\n      // Check if smart wallet is deployed\n      const signature = exactEvmPayload.signature!;\n      const signatureLength = signature.startsWith(\"0x\") ? signature.length - 2 : signature.length;\n      const isSmartWallet = signatureLength > 130; // 65 bytes = 130 hex chars for EOA\n\n      if (isSmartWallet) {\n        const payerAddress = exactEvmPayload.authorization.from;\n        const bytecode = await this.signer.getCode({ address: payerAddress });\n\n        if (!bytecode || bytecode === \"0x\") {\n          // Wallet is not deployed. Check if it's EIP-6492 with deployment info.\n          // EIP-6492 signatures contain factory address and calldata needed for deployment.\n          // Non-EIP-6492 undeployed wallets cannot succeed (no way to deploy them).\n          const erc6492Data = parseErc6492Signature(signature);\n          const hasDeploymentInfo =\n            erc6492Data.address &&\n            erc6492Data.data &&\n            !isAddressEqual(erc6492Data.address, \"0x0000000000000000000000000000000000000000\");\n\n          if (!hasDeploymentInfo) {\n            // Non-EIP-6492 undeployed smart wallet - will always fail at settlement\n            // since EIP-3009 requires on-chain EIP-1271 validation\n            return {\n              isValid: false,\n              invalidReason: \"invalid_exact_evm_payload_undeployed_smart_wallet\",\n              payer: payerAddress,\n            };\n          }\n          // EIP-6492 signature with deployment info - allow through\n          // Facilitators with sponsored deployment support can handle this in settle()\n        } else {\n          // Wallet is deployed but signature still failed - invalid signature\n          return {\n            isValid: false,\n            invalidReason: \"invalid_exact_evm_payload_signature\",\n            payer: exactEvmPayload.authorization.from,\n          };\n        }\n      } else {\n        // EOA signature failed\n        return {\n          isValid: false,\n          invalidReason: \"invalid_exact_evm_payload_signature\",\n          payer: exactEvmPayload.authorization.from,\n        };\n      }\n    }\n\n    // Verify payment recipient matches\n    if (getAddress(exactEvmPayload.authorization.to) !== getAddress(requirements.payTo)) {\n      return {\n        isValid: false,\n        invalidReason: \"invalid_exact_evm_payload_recipient_mismatch\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    // Verify validBefore is in the future (with 6 second buffer for block time)\n    const now = Math.floor(Date.now() / 1000);\n    if (BigInt(exactEvmPayload.authorization.validBefore) < BigInt(now + 6)) {\n      return {\n        isValid: false,\n        invalidReason: \"invalid_exact_evm_payload_authorization_valid_before\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    // Verify validAfter is not in the future\n    if (BigInt(exactEvmPayload.authorization.validAfter) > BigInt(now)) {\n      return {\n        isValid: false,\n        invalidReason: \"invalid_exact_evm_payload_authorization_valid_after\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    // Check balance\n    try {\n      const balance = (await this.signer.readContract({\n        address: erc20Address,\n        abi: eip3009ABI,\n        functionName: \"balanceOf\",\n        args: [exactEvmPayload.authorization.from],\n      })) as bigint;\n\n      if (BigInt(balance) < BigInt(requirementsV1.maxAmountRequired)) {\n        return {\n          isValid: false,\n          invalidReason: \"insufficient_funds\",\n          invalidMessage: `Insufficient funds to complete the payment. Required: ${requirementsV1.maxAmountRequired} ${requirements.asset}, Available: ${balance.toString()} ${requirements.asset}. Please add funds to your wallet and try again.`,\n          payer: exactEvmPayload.authorization.from,\n        };\n      }\n    } catch {\n      // If we can't check balance, continue with other validations\n    }\n\n    // Verify amount is sufficient\n    if (BigInt(exactEvmPayload.authorization.value) < BigInt(requirementsV1.maxAmountRequired)) {\n      return {\n        isValid: false,\n        invalidReason: \"invalid_exact_evm_payload_authorization_value\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    return {\n      isValid: true,\n      invalidReason: undefined,\n      payer: exactEvmPayload.authorization.from,\n    };\n  }\n\n  /**\n   * Settles a payment by executing the transfer (V1).\n   *\n   * @param payload - The payment payload to settle\n   * @param requirements - The payment requirements\n   * @returns Promise resolving to settlement response\n   */\n  async settle(\n    payload: PaymentPayload,\n    requirements: PaymentRequirements,\n  ): Promise<SettleResponse> {\n    const payloadV1 = payload as unknown as PaymentPayloadV1;\n    const exactEvmPayload = payload.payload as ExactEvmPayloadV1;\n\n    // Re-verify before settling\n    const valid = await this.verify(payload, requirements);\n    if (!valid.isValid) {\n      return {\n        success: false,\n        network: payloadV1.network,\n        transaction: \"\",\n        errorReason: valid.invalidReason ?? \"invalid_scheme\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    try {\n      // Parse ERC-6492 signature if applicable\n      const parseResult = parseErc6492Signature(exactEvmPayload.signature!);\n      const { signature, address: factoryAddress, data: factoryCalldata } = parseResult;\n\n      // Deploy ERC-4337 smart wallet via EIP-6492 if configured and needed\n      if (\n        this.config.deployERC4337WithEIP6492 &&\n        factoryAddress &&\n        factoryCalldata &&\n        !isAddressEqual(factoryAddress, \"0x0000000000000000000000000000000000000000\")\n      ) {\n        // Check if smart wallet is already deployed\n        const payerAddress = exactEvmPayload.authorization.from;\n        const bytecode = await this.signer.getCode({ address: payerAddress });\n\n        if (!bytecode || bytecode === \"0x\") {\n          // Wallet not deployed - attempt deployment\n          try {\n            console.log(`Deploying ERC-4337 smart wallet for ${payerAddress} via EIP-6492`);\n\n            // Send the factory calldata directly as a transaction\n            // The factoryCalldata already contains the complete encoded function call\n            const deployTx = await this.signer.sendTransaction({\n              to: factoryAddress as Hex,\n              data: factoryCalldata as Hex,\n            });\n\n            // Wait for deployment transaction\n            await this.signer.waitForTransactionReceipt({ hash: deployTx });\n            console.log(`Successfully deployed smart wallet for ${payerAddress}`);\n          } catch (deployError) {\n            console.error(\"Smart wallet deployment failed:\", deployError);\n            // Deployment failed - cannot proceed\n            throw deployError;\n          }\n        } else {\n          console.log(`Smart wallet for ${payerAddress} already deployed, skipping deployment`);\n        }\n      }\n\n      // Determine if this is an ECDSA signature (EOA) or smart wallet signature\n      // ECDSA signatures are exactly 65 bytes (130 hex chars without 0x)\n      const signatureLength = signature.startsWith(\"0x\") ? signature.length - 2 : signature.length;\n      const isECDSA = signatureLength === 130;\n\n      let tx: Hex;\n      if (isECDSA) {\n        // For EOA wallets, parse signature into v, r, s and use that overload\n        const parsedSig = parseSignature(signature);\n\n        tx = await this.signer.writeContract({\n          address: getAddress(requirements.asset),\n          abi: eip3009ABI,\n          functionName: \"transferWithAuthorization\",\n          args: [\n            getAddress(exactEvmPayload.authorization.from),\n            getAddress(exactEvmPayload.authorization.to),\n            BigInt(exactEvmPayload.authorization.value),\n            BigInt(exactEvmPayload.authorization.validAfter),\n            BigInt(exactEvmPayload.authorization.validBefore),\n            exactEvmPayload.authorization.nonce,\n            (parsedSig.v as number | undefined) || parsedSig.yParity,\n            parsedSig.r,\n            parsedSig.s,\n          ],\n        });\n      } else {\n        // For smart wallets, use the bytes signature overload\n        // The signature contains WebAuthn/P256 or other ERC-1271 compatible signature data\n        tx = await this.signer.writeContract({\n          address: getAddress(requirements.asset),\n          abi: eip3009ABI,\n          functionName: \"transferWithAuthorization\",\n          args: [\n            getAddress(exactEvmPayload.authorization.from),\n            getAddress(exactEvmPayload.authorization.to),\n            BigInt(exactEvmPayload.authorization.value),\n            BigInt(exactEvmPayload.authorization.validAfter),\n            BigInt(exactEvmPayload.authorization.validBefore),\n            exactEvmPayload.authorization.nonce,\n            signature,\n          ],\n        });\n      }\n\n      // Wait for transaction confirmation\n      const receipt = await this.signer.waitForTransactionReceipt({ hash: tx });\n\n      if (receipt.status !== \"success\") {\n        return {\n          success: false,\n          errorReason: \"invalid_transaction_state\",\n          transaction: tx,\n          network: payloadV1.network,\n          payer: exactEvmPayload.authorization.from,\n        };\n      }\n\n      return {\n        success: true,\n        transaction: tx,\n        network: payloadV1.network,\n        payer: exactEvmPayload.authorization.from,\n      };\n    } catch (error) {\n      console.error(\"Failed to settle transaction:\", error);\n      return {\n        success: false,\n        errorReason: \"transaction_failed\",\n        transaction: \"\",\n        network: payloadV1.network,\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n  }\n}\n","export { ExactEvmSchemeV1 } from \"../exact/v1\";\n\nexport const EVM_NETWORK_CHAIN_ID_MAP = {\n  ethereum: 1,\n  sepolia: 11155111,\n  abstract: 2741,\n  \"abstract-testnet\": 11124,\n  \"base-sepolia\": 84532,\n  base: 8453,\n  \"avalanche-fuji\": 43113,\n  avalanche: 43114,\n  iotex: 4689,\n  sei: 1329,\n  \"sei-testnet\": 1328,\n  polygon: 137,\n  \"polygon-amoy\": 80002,\n  peaq: 3338,\n  story: 1514,\n  educhain: 41923,\n  \"skale-base-sepolia\": 324705682,\n  megaeth: 4326,\n} as const;\n\nexport type EvmNetworkV1 = keyof typeof EVM_NETWORK_CHAIN_ID_MAP;\n\nexport const NETWORKS: string[] = 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dist/cjs/exact/v1/facilitator/index.d.ts

 import { SchemeNetworkFacilitator, PaymentPayload, PaymentRequirements, VerifyResponse, SettleResponse } from '@x402/core/types';
-import { F as FacilitatorEvmSigner } from '../../../signer-5OVDxViv.js';
+import { F as FacilitatorEvmSigner } from '../../../signer-3KGwtdNT.js';
 
@@ -4,0 +4,0 @@ interface ExactEvmSchemeV1Config {

dist/cjs/exact/v1/facilitator/index.js.map

@@ -1,1 +0,1 @@
-{"version":3,"sources":["../../../../../src/exact/v1/facilitator/index.ts","../../../../../src/exact/v1/facilitator/scheme.ts","../../../../../src/constants.ts","../../../../../src/utils.ts","../../../../../src/exact/v1/client/scheme.ts","../../../../../src/v1/index.ts"],"sourcesContent":["export { ExactEvmSchemeV1 } from \"./scheme\";\nexport type { ExactEvmSchemeV1Config } from \"./scheme\";\n","import {\n  PaymentPayload,\n  PaymentPayloadV1,\n  PaymentRequirements,\n  SchemeNetworkFacilitator,\n  SettleResponse,\n  VerifyResponse,\n} from \"@x402/core/types\";\nimport { PaymentRequirementsV1 } from \"@x402/core/types/v1\";\nimport { getAddress, Hex, isAddressEqual, parseErc6492Signature, parseSignature } from \"viem\";\nimport { authorizationTypes, eip3009ABI } from \"../../../constants\";\nimport { FacilitatorEvmSigner } from \"../../../signer\";\nimport { ExactEvmPayloadV1 } from \"../../../types\";\nimport { getEvmChainId } from \"../../../utils\";\nimport { EvmNetworkV1 } from \"../../../v1\";\n\nexport interface ExactEvmSchemeV1Config {\n  /**\n   * If enabled, the facilitator will deploy ERC-4337 smart wallets\n   * via EIP-6492 when encountering undeployed contract signatures.\n   *\n   * @default false\n   */\n  deployERC4337WithEIP6492?: boolean;\n}\n\n/**\n * EVM facilitator implementation for the Exact payment scheme (V1).\n */\nexport class ExactEvmSchemeV1 implements SchemeNetworkFacilitator {\n  readonly scheme = \"exact\";\n  readonly caipFamily = \"eip155:*\";\n  private readonly config: Required<ExactEvmSchemeV1Config>;\n\n  /**\n   * Creates a new ExactEvmFacilitatorV1 instance.\n   *\n   * @param signer - The EVM signer for facilitator operations\n   * @param config - Optional configuration for the facilitator\n   */\n  constructor(\n    private readonly signer: FacilitatorEvmSigner,\n    config?: ExactEvmSchemeV1Config,\n  ) {\n    this.config = {\n      deployERC4337WithEIP6492: config?.deployERC4337WithEIP6492 ?? false,\n    };\n  }\n\n  /**\n   * Get mechanism-specific extra data for the supported kinds endpoint.\n   * For EVM, no extra data is needed.\n   *\n   * @param _ - The network identifier (unused for EVM)\n   * @returns undefined (EVM has no extra data)\n   */\n  getExtra(_: string): Record<string, unknown> | undefined {\n    return undefined;\n  }\n\n  /**\n   * Get signer addresses used by this facilitator.\n   * Returns all addresses this facilitator can use for signing/settling transactions.\n   *\n   * @param _ - The network identifier (unused for EVM, addresses are network-agnostic)\n   * @returns Array of facilitator wallet addresses\n   */\n  getSigners(_: string): string[] {\n    return [...this.signer.getAddresses()];\n  }\n\n  /**\n   * Verifies a payment payload (V1).\n   *\n   * @param payload - The payment payload to verify\n   * @param requirements - The payment requirements\n   * @returns Promise resolving to verification response\n   */\n  async verify(\n    payload: PaymentPayload,\n    requirements: PaymentRequirements,\n  ): Promise<VerifyResponse> {\n    const requirementsV1 = requirements as unknown as PaymentRequirementsV1;\n    const payloadV1 = payload as unknown as PaymentPayloadV1;\n    const exactEvmPayload = payload.payload as ExactEvmPayloadV1;\n\n    // Verify scheme matches\n    if (payloadV1.scheme !== \"exact\" || requirements.scheme !== \"exact\") {\n      return {\n        isValid: false,\n        invalidReason: \"unsupported_scheme\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    // Get chain configuration\n    let chainId: number;\n    try {\n      chainId = getEvmChainId(payloadV1.network as EvmNetworkV1);\n    } catch {\n      return {\n        isValid: false,\n        invalidReason: `invalid_network`,\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    if (!requirements.extra?.name || !requirements.extra?.version) {\n      return {\n        isValid: false,\n        invalidReason: \"missing_eip712_domain\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    const { name, version } = requirements.extra;\n    const erc20Address = getAddress(requirements.asset);\n\n    // Verify network matches\n    if (payloadV1.network !== requirements.network) {\n      return {\n        isValid: false,\n        invalidReason: \"network_mismatch\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    // Build typed data for signature verification\n    const permitTypedData = {\n      types: authorizationTypes,\n      primaryType: \"TransferWithAuthorization\" as const,\n      domain: {\n        name,\n        version,\n        chainId,\n        verifyingContract: erc20Address,\n      },\n      message: {\n        from: exactEvmPayload.authorization.from,\n        to: exactEvmPayload.authorization.to,\n        value: BigInt(exactEvmPayload.authorization.value),\n        validAfter: BigInt(exactEvmPayload.authorization.validAfter),\n        validBefore: BigInt(exactEvmPayload.authorization.validBefore),\n        nonce: exactEvmPayload.authorization.nonce,\n      },\n    };\n\n    // Verify signature\n    try {\n      const recoveredAddress = await this.signer.verifyTypedData({\n        address: exactEvmPayload.authorization.from,\n        ...permitTypedData,\n        signature: exactEvmPayload.signature!,\n      });\n\n      if (!recoveredAddress) {\n        return {\n          isValid: false,\n          invalidReason: \"invalid_exact_evm_payload_signature\",\n          payer: exactEvmPayload.authorization.from,\n        };\n      }\n    } catch {\n      // Signature verification failed - could be an undeployed smart wallet\n      // Check if smart wallet is deployed\n      const signature = exactEvmPayload.signature!;\n      const signatureLength = signature.startsWith(\"0x\") ? signature.length - 2 : signature.length;\n      const isSmartWallet = signatureLength > 130; // 65 bytes = 130 hex chars for EOA\n\n      if (isSmartWallet) {\n        const payerAddress = exactEvmPayload.authorization.from;\n        const bytecode = await this.signer.getCode({ address: payerAddress });\n\n        if (!bytecode || bytecode === \"0x\") {\n          // Wallet is not deployed. Check if it's EIP-6492 with deployment info.\n          // EIP-6492 signatures contain factory address and calldata needed for deployment.\n          // Non-EIP-6492 undeployed wallets cannot succeed (no way to deploy them).\n          const erc6492Data = parseErc6492Signature(signature);\n          const hasDeploymentInfo =\n            erc6492Data.address &&\n            erc6492Data.data &&\n            !isAddressEqual(erc6492Data.address, \"0x0000000000000000000000000000000000000000\");\n\n          if (!hasDeploymentInfo) {\n            // Non-EIP-6492 undeployed smart wallet - will always fail at settlement\n            // since EIP-3009 requires on-chain EIP-1271 validation\n            return {\n              isValid: false,\n              invalidReason: \"invalid_exact_evm_payload_undeployed_smart_wallet\",\n              payer: payerAddress,\n            };\n          }\n          // EIP-6492 signature with deployment info - allow through\n          // Facilitators with sponsored deployment support can handle this in settle()\n        } else {\n          // Wallet is deployed but signature still failed - invalid signature\n          return {\n            isValid: false,\n            invalidReason: \"invalid_exact_evm_payload_signature\",\n            payer: exactEvmPayload.authorization.from,\n          };\n        }\n      } else {\n        // EOA signature failed\n        return {\n          isValid: false,\n          invalidReason: \"invalid_exact_evm_payload_signature\",\n          payer: exactEvmPayload.authorization.from,\n        };\n      }\n    }\n\n    // Verify payment recipient matches\n    if (getAddress(exactEvmPayload.authorization.to) !== getAddress(requirements.payTo)) {\n      return {\n        isValid: false,\n        invalidReason: \"invalid_exact_evm_payload_recipient_mismatch\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    // Verify validBefore is in the future (with 6 second buffer for block time)\n    const now = Math.floor(Date.now() / 1000);\n    if (BigInt(exactEvmPayload.authorization.validBefore) < BigInt(now + 6)) {\n      return {\n        isValid: false,\n        invalidReason: \"invalid_exact_evm_payload_authorization_valid_before\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    // Verify validAfter is not in the future\n    if (BigInt(exactEvmPayload.authorization.validAfter) > BigInt(now)) {\n      return {\n        isValid: false,\n        invalidReason: \"invalid_exact_evm_payload_authorization_valid_after\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    // Check balance\n    try {\n      const balance = (await this.signer.readContract({\n        address: erc20Address,\n        abi: eip3009ABI,\n        functionName: \"balanceOf\",\n        args: [exactEvmPayload.authorization.from],\n      })) as bigint;\n\n      if (BigInt(balance) < BigInt(requirementsV1.maxAmountRequired)) {\n        return {\n          isValid: false,\n          invalidReason: \"insufficient_funds\",\n          invalidMessage: `Insufficient funds to complete the payment. Required: ${requirementsV1.maxAmountRequired} ${requirements.asset}, Available: ${balance.toString()} ${requirements.asset}. Please add funds to your wallet and try again.`,\n          payer: exactEvmPayload.authorization.from,\n        };\n      }\n    } catch {\n      // If we can't check balance, continue with other validations\n    }\n\n    // Verify amount is sufficient\n    if (BigInt(exactEvmPayload.authorization.value) < BigInt(requirementsV1.maxAmountRequired)) {\n      return {\n        isValid: false,\n        invalidReason: \"invalid_exact_evm_payload_authorization_value\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    return {\n      isValid: true,\n      invalidReason: undefined,\n      payer: exactEvmPayload.authorization.from,\n    };\n  }\n\n  /**\n   * Settles a payment by executing the transfer (V1).\n   *\n   * @param payload - The payment payload to settle\n   * @param requirements - The payment requirements\n   * @returns Promise resolving to settlement response\n   */\n  async settle(\n    payload: PaymentPayload,\n    requirements: PaymentRequirements,\n  ): Promise<SettleResponse> {\n    const payloadV1 = payload as unknown as PaymentPayloadV1;\n    const exactEvmPayload = payload.payload as ExactEvmPayloadV1;\n\n    // Re-verify before settling\n    const valid = await this.verify(payload, requirements);\n    if (!valid.isValid) {\n      return {\n        success: false,\n        network: payloadV1.network,\n        transaction: \"\",\n        errorReason: valid.invalidReason ?? \"invalid_scheme\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    try {\n      // Parse ERC-6492 signature if applicable\n      const parseResult = parseErc6492Signature(exactEvmPayload.signature!);\n      const { signature, address: factoryAddress, data: factoryCalldata } = parseResult;\n\n      // Deploy ERC-4337 smart wallet via EIP-6492 if configured and needed\n      if (\n        this.config.deployERC4337WithEIP6492 &&\n        factoryAddress &&\n        factoryCalldata &&\n        !isAddressEqual(factoryAddress, \"0x0000000000000000000000000000000000000000\")\n      ) {\n        // Check if smart wallet is already deployed\n        const payerAddress = exactEvmPayload.authorization.from;\n        const bytecode = await this.signer.getCode({ address: payerAddress });\n\n        if (!bytecode || bytecode === \"0x\") {\n          // Wallet not deployed - attempt deployment\n          try {\n            console.log(`Deploying ERC-4337 smart wallet for ${payerAddress} via EIP-6492`);\n\n            // Send the factory calldata directly as a transaction\n            // The factoryCalldata already contains the complete encoded function call\n            const deployTx = await this.signer.sendTransaction({\n              to: factoryAddress as Hex,\n              data: factoryCalldata as Hex,\n            });\n\n            // Wait for deployment transaction\n            await this.signer.waitForTransactionReceipt({ hash: deployTx });\n            console.log(`Successfully deployed smart wallet for ${payerAddress}`);\n          } catch (deployError) {\n            console.error(\"Smart wallet deployment failed:\", deployError);\n            // Deployment failed - cannot proceed\n            throw deployError;\n          }\n        } else {\n          console.log(`Smart wallet for ${payerAddress} already deployed, skipping deployment`);\n        }\n      }\n\n      // Determine if this is an ECDSA signature (EOA) or smart wallet signature\n      // ECDSA signatures are exactly 65 bytes (130 hex chars without 0x)\n      const signatureLength = signature.startsWith(\"0x\") ? signature.length - 2 : signature.length;\n      const isECDSA = signatureLength === 130;\n\n      let tx: Hex;\n      if (isECDSA) {\n        // For EOA wallets, parse signature into v, r, s and use that overload\n        const parsedSig = parseSignature(signature);\n\n        tx = await this.signer.writeContract({\n          address: getAddress(requirements.asset),\n          abi: eip3009ABI,\n          functionName: \"transferWithAuthorization\",\n          args: [\n            getAddress(exactEvmPayload.authorization.from),\n            getAddress(exactEvmPayload.authorization.to),\n            BigInt(exactEvmPayload.authorization.value),\n            BigInt(exactEvmPayload.authorization.validAfter),\n            BigInt(exactEvmPayload.authorization.validBefore),\n            exactEvmPayload.authorization.nonce,\n            (parsedSig.v as number | undefined) || parsedSig.yParity,\n            parsedSig.r,\n            parsedSig.s,\n          ],\n        });\n      } else {\n        // For smart wallets, use the bytes signature overload\n        // The signature contains WebAuthn/P256 or other ERC-1271 compatible signature data\n        tx = await this.signer.writeContract({\n          address: getAddress(requirements.asset),\n          abi: eip3009ABI,\n          functionName: \"transferWithAuthorization\",\n          args: [\n            getAddress(exactEvmPayload.authorization.from),\n            getAddress(exactEvmPayload.authorization.to),\n            BigInt(exactEvmPayload.authorization.value),\n            BigInt(exactEvmPayload.authorization.validAfter),\n            BigInt(exactEvmPayload.authorization.validBefore),\n            exactEvmPayload.authorization.nonce,\n            signature,\n          ],\n        });\n      }\n\n      // Wait for transaction confirmation\n      const receipt = await this.signer.waitForTransactionReceipt({ hash: tx });\n\n      if (receipt.status !== \"success\") {\n        return {\n          success: false,\n          errorReason: \"invalid_transaction_state\",\n          transaction: tx,\n          network: payloadV1.network,\n          payer: exactEvmPayload.authorization.from,\n        };\n      }\n\n      return {\n        success: true,\n        transaction: tx,\n        network: payloadV1.network,\n        payer: exactEvmPayload.authorization.from,\n      };\n    } catch (error) {\n      console.error(\"Failed to settle transaction:\", error);\n      return {\n        success: false,\n        errorReason: \"transaction_failed\",\n        transaction: \"\",\n        network: payloadV1.network,\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n  }\n}\n","// EIP-3009 TransferWithAuthorization types for EIP-712 signing\nexport const authorizationTypes = {\n  TransferWithAuthorization: [\n    { name: \"from\", type: \"address\" },\n    { name: \"to\", type: \"address\" },\n    { name: \"value\", type: \"uint256\" },\n    { name: \"validAfter\", type: \"uint256\" },\n    { name: \"validBefore\", type: \"uint256\" },\n    { name: \"nonce\", type: \"bytes32\" },\n  ],\n} as const;\n\n/**\n * Permit2 EIP-712 types for signing PermitWitnessTransferFrom.\n * Must match the exact format expected by the Permit2 contract.\n * Note: Types must be in ALPHABETICAL order after the primary type (TokenPermissions < Witness).\n */\nexport const permit2WitnessTypes = {\n  PermitWitnessTransferFrom: [\n    { name: \"permitted\", type: \"TokenPermissions\" },\n    { name: \"spender\", type: \"address\" },\n    { name: \"nonce\", type: \"uint256\" },\n    { name: \"deadline\", type: \"uint256\" },\n    { name: \"witness\", type: \"Witness\" },\n  ],\n  TokenPermissions: [\n    { name: \"token\", type: \"address\" },\n    { name: \"amount\", type: \"uint256\" },\n  ],\n  Witness: [\n    { name: \"to\", type: \"address\" },\n    { name: \"validAfter\", type: \"uint256\" },\n    { name: \"extra\", type: \"bytes\" },\n  ],\n} as const;\n\n// EIP3009 ABI for transferWithAuthorization function\nexport const eip3009ABI = [\n  {\n    inputs: [\n      { name: \"from\", type: \"address\" },\n      { name: \"to\", type: \"address\" },\n      { name: \"value\", type: \"uint256\" },\n      { name: \"validAfter\", type: \"uint256\" },\n      { name: \"validBefore\", type: \"uint256\" },\n      { name: \"nonce\", type: \"bytes32\" },\n      { name: \"v\", type: \"uint8\" },\n      { name: \"r\", type: \"bytes32\" },\n      { name: \"s\", type: \"bytes32\" },\n    ],\n    name: \"transferWithAuthorization\",\n    outputs: [],\n    stateMutability: \"nonpayable\",\n    type: \"function\",\n  },\n  {\n    inputs: [\n      { name: \"from\", type: \"address\" },\n      { name: \"to\", type: \"address\" },\n      { name: \"value\", type: \"uint256\" },\n      { name: \"validAfter\", type: \"uint256\" },\n      { name: \"validBefore\", type: \"uint256\" },\n      { name: \"nonce\", type: \"bytes32\" },\n      { name: \"signature\", type: \"bytes\" },\n    ],\n    name: \"transferWithAuthorization\",\n    outputs: [],\n    stateMutability: \"nonpayable\",\n    type: \"function\",\n  },\n  {\n    inputs: [{ name: \"account\", type: \"address\" }],\n    name: \"balanceOf\",\n    outputs: [{ name: \"\", type: \"uint256\" }],\n    stateMutability: \"view\",\n    type: \"function\",\n  },\n  {\n    inputs: [],\n    name: \"version\",\n    outputs: [{ name: \"\", type: \"string\" }],\n    stateMutability: \"view\",\n    type: \"function\",\n  },\n] as const;\n\n/**\n * Canonical Permit2 contract address.\n * Same address on all EVM chains via CREATE2 deployment.\n *\n * @see https://github.com/Uniswap/permit2\n */\nexport const PERMIT2_ADDRESS = \"0x000000000022D473030F116dDEE9F6B43aC78BA3\" as const;\n\n/**\n * x402ExactPermit2Proxy contract address.\n * Vanity address: 0x4020...0001 for easy recognition.\n * This address is deterministic based on:\n * - Arachnid's deterministic deployer (0x4e59b44847b379578588920cA78FbF26c0B4956C)\n * - Vanity-mined salt for prefix 0x4020 and suffix 0001\n * - Contract bytecode + constructor args (PERMIT2_ADDRESS)\n */\nexport const x402ExactPermit2ProxyAddress = \"0x4020615294c913F045dc10f0a5cdEbd86c280001\" as const;\n\n/**\n * x402UptoPermit2Proxy contract address.\n * Vanity address: 0x4020...0002 for easy recognition.\n * This address is deterministic based on:\n * - Arachnid's deterministic deployer (0x4e59b44847b379578588920cA78FbF26c0B4956C)\n * - Vanity-mined salt for prefix 0x4020 and suffix 0002\n * - Contract bytecode + constructor args (PERMIT2_ADDRESS)\n */\nexport const x402UptoPermit2ProxyAddress = \"0x4020633461b2895a48930Ff97eE8fCdE8E520002\" as const;\n\n/**\n * x402UptoPermit2Proxy ABI - settle function for upto payment scheme (variable amounts).\n */\nexport const x402UptoPermit2ProxyABI = [\n  {\n    type: \"function\",\n    name: \"PERMIT2\",\n    inputs: [],\n    outputs: [{ name: \"\", type: \"address\", internalType: \"contract ISignatureTransfer\" }],\n    stateMutability: \"view\",\n  },\n  {\n    type: \"function\",\n    name: \"WITNESS_TYPEHASH\",\n    inputs: [],\n    outputs: [{ name: \"\", type: \"bytes32\", internalType: \"bytes32\" }],\n    stateMutability: \"view\",\n  },\n  {\n    type: \"function\",\n    name: \"WITNESS_TYPE_STRING\",\n    inputs: [],\n    outputs: [{ name: \"\", type: \"string\", internalType: \"string\" }],\n    stateMutability: \"view\",\n  },\n  {\n    type: \"function\",\n    name: \"initialize\",\n    inputs: [{ name: \"_permit2\", type: \"address\", internalType: \"address\" }],\n    outputs: [],\n    stateMutability: \"nonpayable\",\n  },\n  {\n    type: \"function\",\n    name: \"settle\",\n    inputs: [\n      {\n        name: \"permit\",\n        type: \"tuple\",\n        internalType: \"struct ISignatureTransfer.PermitTransferFrom\",\n        components: [\n          {\n            name: \"permitted\",\n            type: \"tuple\",\n            internalType: \"struct ISignatureTransfer.TokenPermissions\",\n            components: [\n              { name: \"token\", type: \"address\", internalType: \"address\" },\n              { name: \"amount\", type: \"uint256\", internalType: \"uint256\" },\n            ],\n          },\n          { name: \"nonce\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"deadline\", type: \"uint256\", internalType: \"uint256\" },\n        ],\n      },\n      { name: \"owner\", type: \"address\", internalType: \"address\" },\n      {\n        name: \"witness\",\n        type: \"tuple\",\n        internalType: \"struct x402BasePermit2Proxy.Witness\",\n        components: [\n          { name: \"to\", type: \"address\", internalType: \"address\" },\n          { name: \"validAfter\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"extra\", type: \"bytes\", internalType: \"bytes\" },\n        ],\n      },\n      { name: \"signature\", type: \"bytes\", internalType: \"bytes\" },\n    ],\n    outputs: [],\n    stateMutability: \"nonpayable\",\n  },\n  {\n    type: \"function\",\n    name: \"settleWithPermit\",\n    inputs: [\n      {\n        name: \"permit2612\",\n        type: \"tuple\",\n        internalType: \"struct x402BasePermit2Proxy.EIP2612Permit\",\n        components: [\n          { name: \"value\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"deadline\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"r\", type: \"bytes32\", internalType: \"bytes32\" },\n          { name: \"s\", type: \"bytes32\", internalType: \"bytes32\" },\n          { name: \"v\", type: \"uint8\", internalType: \"uint8\" },\n        ],\n      },\n      {\n        name: \"permit\",\n        type: \"tuple\",\n        internalType: \"struct ISignatureTransfer.PermitTransferFrom\",\n        components: [\n          {\n            name: \"permitted\",\n            type: \"tuple\",\n            internalType: \"struct ISignatureTransfer.TokenPermissions\",\n            components: [\n              { name: \"token\", type: \"address\", internalType: \"address\" },\n              { name: \"amount\", type: \"uint256\", internalType: \"uint256\" },\n            ],\n          },\n          { name: \"nonce\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"deadline\", type: \"uint256\", internalType: \"uint256\" },\n        ],\n      },\n      { name: \"owner\", type: \"address\", internalType: \"address\" },\n      {\n        name: \"witness\",\n        type: \"tuple\",\n        internalType: \"struct x402BasePermit2Proxy.Witness\",\n        components: [\n          { name: \"to\", type: \"address\", internalType: \"address\" },\n          { name: \"validAfter\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"extra\", type: \"bytes\", internalType: \"bytes\" },\n        ],\n      },\n      { name: \"signature\", type: \"bytes\", internalType: \"bytes\" },\n    ],\n    outputs: [],\n    stateMutability: \"nonpayable\",\n  },\n  { type: \"event\", name: \"Settled\", inputs: [], anonymous: false },\n  { type: \"event\", name: \"SettledWithPermit\", inputs: [], anonymous: false },\n  { type: \"error\", name: \"AlreadyInitialized\", inputs: [] },\n  { type: \"error\", name: \"AmountExceedsPermitted\", inputs: [] },\n  { type: \"error\", name: \"InvalidDestination\", inputs: [] },\n  { type: \"error\", name: \"InvalidOwner\", inputs: [] },\n  { type: \"error\", name: \"InvalidPermit2Address\", inputs: [] },\n  { type: \"error\", name: \"PaymentTooEarly\", inputs: [] },\n  { type: \"error\", name: \"ReentrancyGuardReentrantCall\", inputs: [] },\n] as const;\n\n/**\n * x402ExactPermit2Proxy ABI - settle function for exact payment scheme.\n */\nexport const x402ExactPermit2ProxyABI = [\n  {\n    type: \"function\",\n    name: \"PERMIT2\",\n    inputs: [],\n    outputs: [{ name: \"\", type: \"address\", internalType: \"contract ISignatureTransfer\" }],\n    stateMutability: \"view\",\n  },\n  {\n    type: \"function\",\n    name: \"WITNESS_TYPEHASH\",\n    inputs: [],\n    outputs: [{ name: \"\", type: \"bytes32\", internalType: \"bytes32\" }],\n    stateMutability: \"view\",\n  },\n  {\n    type: \"function\",\n    name: \"WITNESS_TYPE_STRING\",\n    inputs: [],\n    outputs: [{ name: \"\", type: \"string\", internalType: \"string\" }],\n    stateMutability: \"view\",\n  },\n  {\n    type: \"function\",\n    name: \"initialize\",\n    inputs: [{ name: \"_permit2\", type: \"address\", internalType: \"address\" }],\n    outputs: [],\n    stateMutability: \"nonpayable\",\n  },\n  {\n    type: \"function\",\n    name: \"settle\",\n    inputs: [\n      {\n        name: \"permit\",\n        type: \"tuple\",\n        internalType: \"struct ISignatureTransfer.PermitTransferFrom\",\n        components: [\n          {\n            name: \"permitted\",\n            type: \"tuple\",\n            internalType: \"struct ISignatureTransfer.TokenPermissions\",\n            components: [\n              { name: \"token\", type: \"address\", internalType: \"address\" },\n              { name: \"amount\", type: \"uint256\", internalType: \"uint256\" },\n            ],\n          },\n          { name: \"nonce\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"deadline\", type: \"uint256\", internalType: \"uint256\" },\n        ],\n      },\n      { name: \"owner\", type: \"address\", internalType: \"address\" },\n      {\n        name: \"witness\",\n        type: \"tuple\",\n        internalType: \"struct x402BasePermit2Proxy.Witness\",\n        components: [\n          { name: \"to\", type: \"address\", internalType: \"address\" },\n          { name: \"validAfter\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"extra\", type: \"bytes\", internalType: \"bytes\" },\n        ],\n      },\n      { name: \"signature\", type: \"bytes\", internalType: \"bytes\" },\n    ],\n    outputs: [],\n    stateMutability: \"nonpayable\",\n  },\n  {\n    type: \"function\",\n    name: \"settleWithPermit\",\n    inputs: [\n      {\n        name: \"permit2612\",\n        type: \"tuple\",\n        internalType: \"struct x402BasePermit2Proxy.EIP2612Permit\",\n        components: [\n          { name: \"value\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"deadline\", type: \"uint256\", internalType: 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Network }\n  > {\n    const selectedV1 = paymentRequirements as unknown as PaymentRequirementsV1;\n    const nonce = createNonce();\n    const now = Math.floor(Date.now() / 1000);\n\n    const authorization: ExactEvmPayloadV1[\"authorization\"] = {\n      from: this.signer.address,\n      to: getAddress(selectedV1.payTo),\n      value: selectedV1.maxAmountRequired,\n      validAfter: (now - 600).toString(), // 10 minutes before\n      validBefore: (now + selectedV1.maxTimeoutSeconds).toString(),\n      nonce,\n    };\n\n    // Sign the authorization\n    const signature = await this.signAuthorization(authorization, selectedV1);\n\n    const payload: ExactEvmPayloadV1 = {\n      authorization,\n      signature,\n    };\n\n    return {\n      x402Version,\n      scheme: selectedV1.scheme,\n      network: selectedV1.network,\n      payload,\n    };\n  }\n\n  /**\n   * Sign the EIP-3009 authorization using EIP-712\n   *\n   * @param authorization - The authorization to sign\n   * @param requirements - The payment requirements\n   * @returns Promise resolving to the signature\n   */\n  private async signAuthorization(\n    authorization: ExactEvmPayloadV1[\"authorization\"],\n    requirements: PaymentRequirementsV1,\n  ): Promise<`0x${string}`> {\n    const chainId = getEvmChainId(requirements.network as EvmNetworkV1);\n\n    if (!requirements.extra?.name || !requirements.extra?.version) {\n      throw new Error(\n        `EIP-712 domain parameters (name, version) are required in payment requirements for asset ${requirements.asset}`,\n      );\n    }\n\n    const { name, version } = requirements.extra;\n\n    const domain = {\n      name,\n      version,\n      chainId,\n      verifyingContract: getAddress(requirements.asset),\n    };\n\n    const message = {\n      from: getAddress(authorization.from),\n      to: getAddress(authorization.to),\n      value: BigInt(authorization.value),\n      validAfter: BigInt(authorization.validAfter),\n      validBefore: 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+{"version":3,"sources":["../../../../../src/exact/v1/facilitator/index.ts","../../../../../src/exact/v1/facilitator/scheme.ts","../../../../../src/constants.ts","../../../../../src/utils.ts","../../../../../src/exact/v1/client/scheme.ts","../../../../../src/v1/index.ts"],"sourcesContent":["export { ExactEvmSchemeV1 } from \"./scheme\";\nexport type { ExactEvmSchemeV1Config } from \"./scheme\";\n","import {\n  PaymentPayload,\n  PaymentPayloadV1,\n  PaymentRequirements,\n  SchemeNetworkFacilitator,\n  SettleResponse,\n  VerifyResponse,\n} from \"@x402/core/types\";\nimport { PaymentRequirementsV1 } from \"@x402/core/types/v1\";\nimport { getAddress, Hex, isAddressEqual, parseErc6492Signature, parseSignature } from \"viem\";\nimport { authorizationTypes, eip3009ABI } from \"../../../constants\";\nimport { FacilitatorEvmSigner } from \"../../../signer\";\nimport { ExactEvmPayloadV1 } from \"../../../types\";\nimport { getEvmChainId } from \"../../../utils\";\nimport { EvmNetworkV1 } from \"../../../v1\";\n\nexport interface ExactEvmSchemeV1Config {\n  /**\n   * If enabled, the facilitator will deploy ERC-4337 smart wallets\n   * via EIP-6492 when encountering undeployed contract signatures.\n   *\n   * @default false\n   */\n  deployERC4337WithEIP6492?: boolean;\n}\n\n/**\n * EVM facilitator implementation for the Exact payment scheme (V1).\n */\nexport class ExactEvmSchemeV1 implements SchemeNetworkFacilitator {\n  readonly scheme = \"exact\";\n  readonly caipFamily = \"eip155:*\";\n  private readonly config: Required<ExactEvmSchemeV1Config>;\n\n  /**\n   * Creates a new ExactEvmFacilitatorV1 instance.\n   *\n   * @param signer - The EVM signer for facilitator operations\n   * @param config - Optional configuration for the facilitator\n   */\n  constructor(\n    private readonly signer: FacilitatorEvmSigner,\n    config?: ExactEvmSchemeV1Config,\n  ) {\n    this.config = {\n      deployERC4337WithEIP6492: config?.deployERC4337WithEIP6492 ?? false,\n    };\n  }\n\n  /**\n   * Get mechanism-specific extra data for the supported kinds endpoint.\n   * For EVM, no extra data is needed.\n   *\n   * @param _ - The network identifier (unused for EVM)\n   * @returns undefined (EVM has no extra data)\n   */\n  getExtra(_: string): Record<string, unknown> | undefined {\n    return undefined;\n  }\n\n  /**\n   * Get signer addresses used by this facilitator.\n   * Returns all addresses this facilitator can use for signing/settling transactions.\n   *\n   * @param _ - The network identifier (unused for EVM, addresses are network-agnostic)\n   * @returns Array of facilitator wallet addresses\n   */\n  getSigners(_: string): string[] {\n    return [...this.signer.getAddresses()];\n  }\n\n  /**\n   * Verifies a payment payload (V1).\n   *\n   * @param payload - The payment payload to verify\n   * @param requirements - The payment requirements\n   * @returns Promise resolving to verification response\n   */\n  async verify(\n    payload: PaymentPayload,\n    requirements: PaymentRequirements,\n  ): Promise<VerifyResponse> {\n    const requirementsV1 = requirements as unknown as PaymentRequirementsV1;\n    const payloadV1 = payload as unknown as PaymentPayloadV1;\n    const exactEvmPayload = payload.payload as ExactEvmPayloadV1;\n\n    // Verify scheme matches\n    if (payloadV1.scheme !== \"exact\" || requirements.scheme !== \"exact\") {\n      return {\n        isValid: false,\n        invalidReason: \"unsupported_scheme\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    // Get chain configuration\n    let chainId: number;\n    try {\n      chainId = getEvmChainId(payloadV1.network as EvmNetworkV1);\n    } catch {\n      return {\n        isValid: false,\n        invalidReason: `invalid_network`,\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    if (!requirements.extra?.name || !requirements.extra?.version) {\n      return {\n        isValid: false,\n        invalidReason: \"missing_eip712_domain\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    const { name, version } = requirements.extra;\n    const erc20Address = getAddress(requirements.asset);\n\n    // Verify network matches\n    if (payloadV1.network !== requirements.network) {\n      return {\n        isValid: false,\n        invalidReason: \"network_mismatch\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    // Build typed data for signature verification\n    const permitTypedData = {\n      types: authorizationTypes,\n      primaryType: \"TransferWithAuthorization\" as const,\n      domain: {\n        name,\n        version,\n        chainId,\n        verifyingContract: erc20Address,\n      },\n      message: {\n        from: exactEvmPayload.authorization.from,\n        to: exactEvmPayload.authorization.to,\n        value: BigInt(exactEvmPayload.authorization.value),\n        validAfter: BigInt(exactEvmPayload.authorization.validAfter),\n        validBefore: BigInt(exactEvmPayload.authorization.validBefore),\n        nonce: exactEvmPayload.authorization.nonce,\n      },\n    };\n\n    // Verify signature\n    try {\n      const recoveredAddress = await this.signer.verifyTypedData({\n        address: exactEvmPayload.authorization.from,\n        ...permitTypedData,\n        signature: exactEvmPayload.signature!,\n      });\n\n      if (!recoveredAddress) {\n        return {\n          isValid: false,\n          invalidReason: \"invalid_exact_evm_payload_signature\",\n          payer: exactEvmPayload.authorization.from,\n        };\n      }\n    } catch {\n      // Signature verification failed - could be an undeployed smart wallet\n      // Check if smart wallet is deployed\n      const signature = exactEvmPayload.signature!;\n      const signatureLength = signature.startsWith(\"0x\") ? signature.length - 2 : signature.length;\n      const isSmartWallet = signatureLength > 130; // 65 bytes = 130 hex chars for EOA\n\n      if (isSmartWallet) {\n        const payerAddress = exactEvmPayload.authorization.from;\n        const bytecode = await this.signer.getCode({ address: payerAddress });\n\n        if (!bytecode || bytecode === \"0x\") {\n          // Wallet is not deployed. Check if it's EIP-6492 with deployment info.\n          // EIP-6492 signatures contain factory address and calldata needed for deployment.\n          // Non-EIP-6492 undeployed wallets cannot succeed (no way to deploy them).\n          const erc6492Data = parseErc6492Signature(signature);\n          const hasDeploymentInfo =\n            erc6492Data.address &&\n            erc6492Data.data &&\n            !isAddressEqual(erc6492Data.address, \"0x0000000000000000000000000000000000000000\");\n\n          if (!hasDeploymentInfo) {\n            // Non-EIP-6492 undeployed smart wallet - will always fail at settlement\n            // since EIP-3009 requires on-chain EIP-1271 validation\n            return {\n              isValid: false,\n              invalidReason: \"invalid_exact_evm_payload_undeployed_smart_wallet\",\n              payer: payerAddress,\n            };\n          }\n          // EIP-6492 signature with deployment info - allow through\n          // Facilitators with sponsored deployment support can handle this in settle()\n        } else {\n          // Wallet is deployed but signature still failed - invalid signature\n          return {\n            isValid: false,\n            invalidReason: \"invalid_exact_evm_payload_signature\",\n            payer: exactEvmPayload.authorization.from,\n          };\n        }\n      } else {\n        // EOA signature failed\n        return {\n          isValid: false,\n          invalidReason: \"invalid_exact_evm_payload_signature\",\n          payer: exactEvmPayload.authorization.from,\n        };\n      }\n    }\n\n    // Verify payment recipient matches\n    if (getAddress(exactEvmPayload.authorization.to) !== getAddress(requirements.payTo)) {\n      return {\n        isValid: false,\n        invalidReason: \"invalid_exact_evm_payload_recipient_mismatch\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    // Verify validBefore is in the future (with 6 second buffer for block time)\n    const now = Math.floor(Date.now() / 1000);\n    if (BigInt(exactEvmPayload.authorization.validBefore) < BigInt(now + 6)) {\n      return {\n        isValid: false,\n        invalidReason: \"invalid_exact_evm_payload_authorization_valid_before\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    // Verify validAfter is not in the future\n    if (BigInt(exactEvmPayload.authorization.validAfter) > BigInt(now)) {\n      return {\n        isValid: false,\n        invalidReason: \"invalid_exact_evm_payload_authorization_valid_after\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    // Check balance\n    try {\n      const balance = (await this.signer.readContract({\n        address: erc20Address,\n        abi: eip3009ABI,\n        functionName: \"balanceOf\",\n        args: [exactEvmPayload.authorization.from],\n      })) as bigint;\n\n      if (BigInt(balance) < BigInt(requirementsV1.maxAmountRequired)) {\n        return {\n          isValid: false,\n          invalidReason: \"insufficient_funds\",\n          invalidMessage: `Insufficient funds to complete the payment. Required: ${requirementsV1.maxAmountRequired} ${requirements.asset}, Available: ${balance.toString()} ${requirements.asset}. Please add funds to your wallet and try again.`,\n          payer: exactEvmPayload.authorization.from,\n        };\n      }\n    } catch {\n      // If we can't check balance, continue with other validations\n    }\n\n    // Verify amount is sufficient\n    if (BigInt(exactEvmPayload.authorization.value) < BigInt(requirementsV1.maxAmountRequired)) {\n      return {\n        isValid: false,\n        invalidReason: \"invalid_exact_evm_payload_authorization_value\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    return {\n      isValid: true,\n      invalidReason: undefined,\n      payer: exactEvmPayload.authorization.from,\n    };\n  }\n\n  /**\n   * Settles a payment by executing the transfer (V1).\n   *\n   * @param payload - The payment payload to settle\n   * @param requirements - The payment requirements\n   * @returns Promise resolving to settlement response\n   */\n  async settle(\n    payload: PaymentPayload,\n    requirements: PaymentRequirements,\n  ): Promise<SettleResponse> {\n    const payloadV1 = payload as unknown as PaymentPayloadV1;\n    const exactEvmPayload = payload.payload as ExactEvmPayloadV1;\n\n    // Re-verify before settling\n    const valid = await this.verify(payload, requirements);\n    if (!valid.isValid) {\n      return {\n        success: false,\n        network: payloadV1.network,\n        transaction: \"\",\n        errorReason: valid.invalidReason ?? \"invalid_scheme\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    try {\n      // Parse ERC-6492 signature if applicable\n      const parseResult = parseErc6492Signature(exactEvmPayload.signature!);\n      const { signature, address: factoryAddress, data: factoryCalldata } = parseResult;\n\n      // Deploy ERC-4337 smart wallet via EIP-6492 if configured and needed\n      if (\n        this.config.deployERC4337WithEIP6492 &&\n        factoryAddress &&\n        factoryCalldata &&\n        !isAddressEqual(factoryAddress, \"0x0000000000000000000000000000000000000000\")\n      ) {\n        // Check if smart wallet is already deployed\n        const payerAddress = exactEvmPayload.authorization.from;\n        const bytecode = await this.signer.getCode({ address: payerAddress });\n\n        if (!bytecode || bytecode === \"0x\") {\n          // Wallet not deployed - attempt deployment\n          try {\n            console.log(`Deploying ERC-4337 smart wallet for ${payerAddress} via EIP-6492`);\n\n            // Send the factory calldata directly as a transaction\n            // The factoryCalldata already contains the complete encoded function call\n            const deployTx = await this.signer.sendTransaction({\n              to: factoryAddress as Hex,\n              data: factoryCalldata as Hex,\n            });\n\n            // Wait for deployment transaction\n            await this.signer.waitForTransactionReceipt({ hash: deployTx });\n            console.log(`Successfully deployed smart wallet for ${payerAddress}`);\n          } catch (deployError) {\n            console.error(\"Smart wallet deployment failed:\", deployError);\n            // Deployment failed - cannot proceed\n            throw deployError;\n          }\n        } else {\n          console.log(`Smart wallet for ${payerAddress} already deployed, skipping deployment`);\n        }\n      }\n\n      // Determine if this is an ECDSA signature (EOA) or smart wallet signature\n      // ECDSA signatures are exactly 65 bytes (130 hex chars without 0x)\n      const signatureLength = signature.startsWith(\"0x\") ? signature.length - 2 : signature.length;\n      const isECDSA = signatureLength === 130;\n\n      let tx: Hex;\n      if (isECDSA) {\n        // For EOA wallets, parse signature into v, r, s and use that overload\n        const parsedSig = parseSignature(signature);\n\n        tx = await this.signer.writeContract({\n          address: getAddress(requirements.asset),\n          abi: eip3009ABI,\n          functionName: \"transferWithAuthorization\",\n          args: [\n            getAddress(exactEvmPayload.authorization.from),\n            getAddress(exactEvmPayload.authorization.to),\n            BigInt(exactEvmPayload.authorization.value),\n            BigInt(exactEvmPayload.authorization.validAfter),\n            BigInt(exactEvmPayload.authorization.validBefore),\n            exactEvmPayload.authorization.nonce,\n            (parsedSig.v as number | undefined) || parsedSig.yParity,\n            parsedSig.r,\n            parsedSig.s,\n          ],\n        });\n      } else {\n        // For smart wallets, use the bytes signature overload\n        // The signature contains WebAuthn/P256 or other ERC-1271 compatible signature data\n        tx = await this.signer.writeContract({\n          address: getAddress(requirements.asset),\n          abi: eip3009ABI,\n          functionName: \"transferWithAuthorization\",\n          args: [\n            getAddress(exactEvmPayload.authorization.from),\n            getAddress(exactEvmPayload.authorization.to),\n            BigInt(exactEvmPayload.authorization.value),\n            BigInt(exactEvmPayload.authorization.validAfter),\n            BigInt(exactEvmPayload.authorization.validBefore),\n            exactEvmPayload.authorization.nonce,\n            signature,\n          ],\n        });\n      }\n\n      // Wait for transaction confirmation\n      const receipt = await this.signer.waitForTransactionReceipt({ hash: tx });\n\n      if (receipt.status !== \"success\") {\n        return {\n          success: false,\n          errorReason: \"invalid_transaction_state\",\n          transaction: tx,\n          network: payloadV1.network,\n          payer: exactEvmPayload.authorization.from,\n        };\n      }\n\n      return {\n        success: true,\n        transaction: tx,\n        network: payloadV1.network,\n        payer: exactEvmPayload.authorization.from,\n      };\n    } catch (error) {\n      console.error(\"Failed to settle transaction:\", error);\n      return {\n        success: false,\n        errorReason: \"transaction_failed\",\n        transaction: \"\",\n        network: payloadV1.network,\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n  }\n}\n","// EIP-3009 TransferWithAuthorization types for EIP-712 signing\nexport const authorizationTypes = {\n  TransferWithAuthorization: [\n    { name: \"from\", type: \"address\" },\n    { name: \"to\", type: \"address\" },\n    { name: \"value\", type: \"uint256\" },\n    { name: \"validAfter\", type: \"uint256\" },\n    { name: \"validBefore\", type: \"uint256\" },\n    { name: \"nonce\", type: \"bytes32\" },\n  ],\n} as const;\n\n/**\n * Permit2 EIP-712 types for signing PermitWitnessTransferFrom.\n * Must match the exact format expected by the Permit2 contract.\n * Note: Types must be in ALPHABETICAL order after the primary type (TokenPermissions < Witness).\n */\nexport const permit2WitnessTypes = {\n  PermitWitnessTransferFrom: [\n    { name: \"permitted\", type: \"TokenPermissions\" },\n    { name: \"spender\", type: \"address\" },\n    { name: \"nonce\", type: \"uint256\" },\n    { name: \"deadline\", type: \"uint256\" },\n    { name: \"witness\", type: \"Witness\" },\n  ],\n  TokenPermissions: [\n    { name: \"token\", type: \"address\" },\n    { name: \"amount\", type: \"uint256\" },\n  ],\n  Witness: [\n    { name: \"to\", type: \"address\" },\n    { name: \"validAfter\", type: \"uint256\" },\n    { name: \"extra\", type: \"bytes\" },\n  ],\n} as const;\n\n// EIP3009 ABI for transferWithAuthorization function\nexport const eip3009ABI = [\n  {\n    inputs: [\n      { name: \"from\", type: \"address\" },\n      { name: \"to\", type: \"address\" },\n      { name: \"value\", type: \"uint256\" },\n      { name: \"validAfter\", type: \"uint256\" },\n      { name: \"validBefore\", type: \"uint256\" },\n      { name: \"nonce\", type: \"bytes32\" },\n      { name: \"v\", type: \"uint8\" },\n      { name: \"r\", type: \"bytes32\" },\n      { name: \"s\", type: \"bytes32\" },\n    ],\n    name: \"transferWithAuthorization\",\n    outputs: [],\n    stateMutability: \"nonpayable\",\n    type: \"function\",\n  },\n  {\n    inputs: [\n      { name: \"from\", type: \"address\" },\n      { name: \"to\", type: \"address\" },\n      { name: \"value\", type: \"uint256\" },\n      { name: \"validAfter\", type: \"uint256\" },\n      { name: \"validBefore\", type: \"uint256\" },\n      { name: \"nonce\", type: \"bytes32\" },\n      { name: \"signature\", type: \"bytes\" },\n    ],\n    name: \"transferWithAuthorization\",\n    outputs: [],\n    stateMutability: \"nonpayable\",\n    type: \"function\",\n  },\n  {\n    inputs: [{ name: \"account\", type: \"address\" }],\n    name: \"balanceOf\",\n    outputs: [{ name: \"\", type: \"uint256\" }],\n    stateMutability: \"view\",\n    type: \"function\",\n  },\n  {\n    inputs: [],\n    name: \"version\",\n    outputs: [{ name: \"\", type: \"string\" }],\n    stateMutability: \"view\",\n    type: \"function\",\n  },\n] as const;\n\n/**\n * EIP-2612 Permit EIP-712 types for signing token.permit().\n */\nexport const eip2612PermitTypes = {\n  Permit: [\n    { name: \"owner\", type: \"address\" },\n    { name: \"spender\", type: \"address\" },\n    { name: \"value\", type: \"uint256\" },\n    { name: \"nonce\", type: \"uint256\" },\n    { name: \"deadline\", type: \"uint256\" },\n  ],\n} as const;\n\n/**\n * EIP-2612 nonces ABI for querying current nonce.\n */\nexport const eip2612NoncesAbi = [\n  {\n    type: \"function\",\n    name: \"nonces\",\n    inputs: [{ name: \"owner\", type: \"address\" }],\n    outputs: [{ type: \"uint256\" }],\n    stateMutability: \"view\",\n  },\n] as const;\n\n/**\n * Canonical Permit2 contract address.\n * Same address on all EVM chains via CREATE2 deployment.\n *\n * @see https://github.com/Uniswap/permit2\n */\nexport const PERMIT2_ADDRESS = \"0x000000000022D473030F116dDEE9F6B43aC78BA3\" as const;\n\n/**\n * x402ExactPermit2Proxy contract address.\n * Vanity address: 0x4020...0001 for easy recognition.\n * This address is deterministic based on:\n * - Arachnid's deterministic deployer (0x4e59b44847b379578588920cA78FbF26c0B4956C)\n * - Vanity-mined salt for prefix 0x4020 and suffix 0001\n * - Contract bytecode + constructor args (PERMIT2_ADDRESS)\n */\nexport const x402ExactPermit2ProxyAddress = \"0x4020615294c913F045dc10f0a5cdEbd86c280001\" as const;\n\n/**\n * x402UptoPermit2Proxy contract address.\n * Vanity address: 0x4020...0002 for easy recognition.\n * This address is deterministic based on:\n * - Arachnid's deterministic deployer (0x4e59b44847b379578588920cA78FbF26c0B4956C)\n * - Vanity-mined salt for prefix 0x4020 and suffix 0002\n * - Contract bytecode + constructor args (PERMIT2_ADDRESS)\n */\nexport const x402UptoPermit2ProxyAddress = \"0x4020633461b2895a48930Ff97eE8fCdE8E520002\" as const;\n\n/**\n * x402UptoPermit2Proxy ABI - settle function for upto payment scheme (variable amounts).\n */\nexport const x402UptoPermit2ProxyABI = [\n  {\n    type: \"function\",\n    name: \"PERMIT2\",\n    inputs: [],\n    outputs: [{ name: \"\", type: \"address\", internalType: \"contract ISignatureTransfer\" }],\n    stateMutability: \"view\",\n  },\n  {\n    type: \"function\",\n    name: \"WITNESS_TYPEHASH\",\n    inputs: [],\n    outputs: [{ name: \"\", type: \"bytes32\", internalType: \"bytes32\" }],\n    stateMutability: \"view\",\n  },\n  {\n    type: \"function\",\n    name: \"WITNESS_TYPE_STRING\",\n    inputs: [],\n    outputs: [{ name: \"\", type: \"string\", internalType: \"string\" }],\n    stateMutability: \"view\",\n  },\n  {\n    type: \"function\",\n    name: \"initialize\",\n    inputs: [{ name: \"_permit2\", type: \"address\", internalType: \"address\" }],\n    outputs: [],\n    stateMutability: \"nonpayable\",\n  },\n  {\n    type: \"function\",\n    name: \"settle\",\n    inputs: [\n      {\n        name: \"permit\",\n        type: \"tuple\",\n        internalType: \"struct ISignatureTransfer.PermitTransferFrom\",\n        components: [\n          {\n            name: \"permitted\",\n            type: \"tuple\",\n            internalType: \"struct ISignatureTransfer.TokenPermissions\",\n            components: [\n              { name: \"token\", type: \"address\", internalType: \"address\" },\n              { name: \"amount\", type: \"uint256\", internalType: \"uint256\" },\n            ],\n          },\n          { name: \"nonce\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"deadline\", type: \"uint256\", internalType: \"uint256\" },\n        ],\n      },\n      { name: \"owner\", type: \"address\", internalType: \"address\" },\n      {\n        name: \"witness\",\n        type: \"tuple\",\n        internalType: \"struct x402BasePermit2Proxy.Witness\",\n        components: [\n          { name: \"to\", type: \"address\", internalType: \"address\" },\n          { name: \"validAfter\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"extra\", type: \"bytes\", internalType: \"bytes\" },\n        ],\n      },\n      { name: \"signature\", type: \"bytes\", internalType: \"bytes\" },\n    ],\n    outputs: [],\n    stateMutability: \"nonpayable\",\n  },\n  {\n    type: \"function\",\n    name: \"settleWithPermit\",\n    inputs: [\n      {\n        name: \"permit2612\",\n        type: \"tuple\",\n        internalType: \"struct x402BasePermit2Proxy.EIP2612Permit\",\n        components: [\n          { name: \"value\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"deadline\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"r\", type: \"bytes32\", internalType: \"bytes32\" },\n          { name: \"s\", type: \"bytes32\", internalType: \"bytes32\" },\n          { name: \"v\", type: \"uint8\", internalType: \"uint8\" },\n        ],\n      },\n      {\n        name: \"permit\",\n        type: \"tuple\",\n        internalType: \"struct ISignatureTransfer.PermitTransferFrom\",\n        components: [\n          {\n            name: \"permitted\",\n            type: \"tuple\",\n            internalType: \"struct ISignatureTransfer.TokenPermissions\",\n            components: [\n              { name: \"token\", type: \"address\", internalType: \"address\" },\n              { name: \"amount\", type: \"uint256\", internalType: \"uint256\" },\n            ],\n          },\n          { name: \"nonce\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"deadline\", type: \"uint256\", internalType: \"uint256\" },\n        ],\n      },\n      { name: \"owner\", type: \"address\", internalType: \"address\" },\n      {\n        name: \"witness\",\n        type: \"tuple\",\n        internalType: \"struct x402BasePermit2Proxy.Witness\",\n        components: [\n          { name: \"to\", type: \"address\", internalType: \"address\" },\n          { name: \"validAfter\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"extra\", type: \"bytes\", internalType: \"bytes\" },\n        ],\n      },\n      { name: \"signature\", type: \"bytes\", internalType: \"bytes\" },\n    ],\n    outputs: [],\n    stateMutability: \"nonpayable\",\n  },\n  { type: \"event\", name: \"Settled\", inputs: [], anonymous: false },\n  { type: \"event\", name: \"SettledWithPermit\", inputs: [], anonymous: false },\n  { type: \"error\", name: \"AlreadyInitialized\", inputs: [] },\n  { type: \"error\", name: \"AmountExceedsPermitted\", inputs: [] },\n  { type: \"error\", name: \"InvalidDestination\", inputs: [] },\n  { type: \"error\", name: \"InvalidOwner\", inputs: [] },\n  { type: \"error\", name: \"InvalidPermit2Address\", inputs: [] },\n  { type: \"error\", name: \"PaymentTooEarly\", inputs: [] },\n  { type: \"error\", name: \"ReentrancyGuardReentrantCall\", inputs: [] },\n] as const;\n\n/**\n * x402ExactPermit2Proxy ABI - settle function for exact payment scheme.\n */\nexport const x402ExactPermit2ProxyABI = [\n  {\n    type: \"function\",\n    name: \"PERMIT2\",\n    inputs: [],\n    outputs: [{ name: \"\", type: \"address\", internalType: \"contract ISignatureTransfer\" }],\n    stateMutability: \"view\",\n  },\n  {\n    type: \"function\",\n    name: \"WITNESS_TYPEHASH\",\n    inputs: [],\n    outputs: [{ name: \"\", type: \"bytes32\", internalType: \"bytes32\" }],\n    stateMutability: \"view\",\n  },\n  {\n    type: \"function\",\n    name: \"WITNESS_TYPE_STRING\",\n    inputs: [],\n    outputs: [{ name: \"\", type: \"string\", internalType: \"string\" }],\n    stateMutability: \"view\",\n  },\n  {\n    type: \"function\",\n    name: \"initialize\",\n    inputs: [{ name: \"_permit2\", type: \"address\", internalType: \"address\" }],\n    outputs: [],\n    stateMutability: \"nonpayable\",\n  },\n  {\n    type: \"function\",\n    name: \"settle\",\n    inputs: [\n      {\n        name: \"permit\",\n        type: \"tuple\",\n        internalType: \"struct ISignatureTransfer.PermitTransferFrom\",\n        components: [\n          {\n            name: \"permitted\",\n            type: \"tuple\",\n            internalType: \"struct ISignatureTransfer.TokenPermissions\",\n            components: [\n              { name: \"token\", type: \"address\", internalType: \"address\" },\n              { name: \"amount\", type: \"uint256\", internalType: \"uint256\" },\n            ],\n          },\n          { name: \"nonce\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"deadline\", type: \"uint256\", internalType: \"uint256\" },\n        ],\n      },\n      { name: \"owner\", type: \"address\", internalType: \"address\" },\n      {\n        name: \"witness\",\n        type: \"tuple\",\n        internalType: \"struct x402BasePermit2Proxy.Witness\",\n        components: [\n          { name: \"to\", type: \"address\", internalType: \"address\" },\n          { name: \"validAfter\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"extra\", type: \"bytes\", internalType: \"bytes\" },\n        ],\n      },\n      { name: \"signature\", type: \"bytes\", internalType: \"bytes\" },\n    ],\n    outputs: [],\n    stateMutability: \"nonpayable\",\n  },\n  {\n    type: \"function\",\n    name: \"settleWithPermit\",\n    inputs: [\n      {\n        name: \"permit2612\",\n        type: \"tuple\",\n        internalType: \"struct x402BasePermit2Proxy.EIP2612Permit\",\n        components: [\n          { name: \"value\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"deadline\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"r\", type: \"bytes32\", internalType: \"bytes32\" },\n          { name: \"s\", type: \"bytes32\", internalType: \"bytes32\" },\n          { name: \"v\", type: \"uint8\", internalType: \"uint8\" },\n        ],\n      },\n      {\n        name: \"permit\",\n        type: \"tuple\",\n        internalType: \"struct ISignatureTransfer.PermitTransferFrom\",\n        components: [\n          {\n            name: \"permitted\",\n            type: \"tuple\",\n            internalType: \"struct ISignatureTransfer.TokenPermissions\",\n            components: [\n              { name: \"token\", type: \"address\", internalType: \"address\" },\n              { name: \"amount\", type: \"uint256\", internalType: \"uint256\" },\n            ],\n          },\n          { name: \"nonce\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"deadline\", type: \"uint256\", internalType: \"uint256\" },\n        ],\n      },\n      { name: \"owner\", type: \"address\", internalType: \"address\" },\n      {\n        name: \"witness\",\n        type: \"tuple\",\n        internalType: \"struct x402BasePermit2Proxy.Witness\",\n        components: [\n          { name: \"to\", type: \"address\", internalType: \"address\" },\n          { name: \"validAfter\", 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SchemeNetworkClient {\n  readonly scheme = \"exact\";\n\n  /**\n   * Creates a new ExactEvmClientV1 instance.\n   *\n   * @param signer - The EVM signer for client operations\n   */\n  constructor(private readonly signer: ClientEvmSigner) {}\n\n  /**\n   * Creates a payment payload for the Exact scheme (V1).\n   *\n   * @param x402Version - The x402 protocol version\n   * @param paymentRequirements - The payment requirements\n   * @returns Promise resolving to a payment payload\n   */\n  async createPaymentPayload(\n    x402Version: number,\n    paymentRequirements: PaymentRequirements,\n  ): Promise<\n    Pick<PaymentPayload, \"x402Version\" | \"payload\"> & { scheme: string; network: Network }\n  > {\n    const selectedV1 = paymentRequirements as unknown as PaymentRequirementsV1;\n    const nonce = createNonce();\n    const now = Math.floor(Date.now() / 1000);\n\n    const authorization: ExactEvmPayloadV1[\"authorization\"] = {\n      from: this.signer.address,\n      to: 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dist/cjs/index.d.ts

@@ -1,3 +0,3 @@
-export { E as ExactEvmScheme, P as Permit2AllowanceParams, c as createPermit2ApprovalTx, e as erc20AllowanceAbi, g as getPermit2AllowanceReadParams } from './permit2-BYv82va2.js';
-export { C as ClientEvmSigner, F as FacilitatorEvmSigner, t as toClientEvmSigner, a as toFacilitatorEvmSigner } from './signer-5OVDxViv.js';
+export { E as ExactEvmScheme, P as Permit2AllowanceParams, c as createPermit2ApprovalTx, e as erc20AllowanceAbi, g as getPermit2AllowanceReadParams } from './permit2-CzKPU5By.js';
+export { C as ClientEvmSigner, F as FacilitatorEvmSigner, t as toClientEvmSigner, a as toFacilitatorEvmSigner } from './signer-3KGwtdNT.js';
 import '@x402/core/types';
@@ -4,0 +4,0 @@

dist/cjs/index.js

@@ -41,4 +41,4 @@ "use strict";
 
-// src/exact/client/eip3009.ts
-var import_viem4 = require("viem");
+// src/exact/client/scheme.ts
+var import_extensions = require("@x402/extensions");
 
@@ -122,2 +122,20 @@ // src/constants.ts
 ];
+var eip2612PermitTypes = {
+  Permit: [
+    { name: "owner", type: "address" },
+    { name: "spender", type: "address" },
+    { name: "value", type: "uint256" },
+    { name: "nonce", type: "uint256" },
+    { name: "deadline", type: "uint256" }
+  ]
+};
+var eip2612NoncesAbi = [
+  {
+    type: "function",
+    name: "nonces",
+    inputs: [{ name: "owner", type: "address" }],
+    outputs: [{ type: "uint256" }],
+    stateMutability: "view"
+  }
+];
 var PERMIT2_ADDRESS = "0x000000000022D473030F116dDEE9F6B43aC78BA3";
@@ -253,2 +271,8 @@ var x402ExactPermit2ProxyAddress = "0x4020615294c913F045dc10f0a5cdEbd86c280001";
 
+// src/exact/client/scheme.ts
+var import_viem7 = require("viem");
+
+// src/exact/client/eip3009.ts
+var import_viem4 = require("viem");
+
 // src/utils.ts
@@ -463,3 +487,58 @@ var import_viem3 = require("viem");
 
+// src/exact/client/eip2612.ts
+var import_viem6 = require("viem");
+var MAX_UINT2562 = BigInt("0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff");
+async function signEip2612Permit(signer, tokenAddress, tokenName, tokenVersion, chainId, deadline) {
+  const owner = signer.address;
+  const spender = (0, import_viem6.getAddress)(PERMIT2_ADDRESS);
+  const nonce = await signer.readContract({
+    address: tokenAddress,
+    abi: eip2612NoncesAbi,
+    functionName: "nonces",
+    args: [owner]
+  });
+  const domain = {
+    name: tokenName,
+    version: tokenVersion,
+    chainId,
+    verifyingContract: tokenAddress
+  };
+  const message = {
+    owner,
+    spender,
+    value: MAX_UINT2562,
+    nonce,
+    deadline: BigInt(deadline)
+  };
+  const signature = await signer.signTypedData({
+    domain,
+    types: eip2612PermitTypes,
+    primaryType: "Permit",
+    message
+  });
+  return {
+    from: owner,
+    asset: tokenAddress,
+    spender,
+    amount: MAX_UINT2562.toString(),
+    nonce: nonce.toString(),
+    deadline,
+    signature,
+    version: "1"
+  };
+}
+
 // src/exact/client/scheme.ts
+var erc20AllowanceAbi2 = [
+  {
+    type: "function",
+    name: "allowance",
+    inputs: [
+      { name: "owner", type: "address" },
+      { name: "spender", type: "address" }
+    ],
+    outputs: [{ type: "uint256" }],
+    stateMutability: "view"
+  }
+];
 var ExactEvmScheme = class {
@@ -469,3 +548,5 @@ /**
    *
-   * @param signer - The EVM signer for client operations
+   * @param signer - The EVM signer for client operations.
+   *   Must support `readContract` for EIP-2612 gas sponsoring.
+   *   Use `createWalletClient(...).extend(publicActions)` or `toClientEvmSigner(account, publicClient)`.
    */
@@ -480,18 +561,97 @@ constructor(signer) {
    *
+   * For Permit2 flows, if the server advertises `eip2612GasSponsoring` and the
+   * signer supports `readContract`, automatically signs an EIP-2612 permit
+   * when Permit2 allowance is insufficient.
+   *
    * @param x402Version - The x402 protocol version
    * @param paymentRequirements - The payment requirements
-   * @returns Promise resolving to a payment payload result
+   * @param context - Optional context with server-declared extensions
+   * @returns Promise resolving to a payment payload result (with optional extensions)
    */
-  async createPaymentPayload(x402Version, paymentRequirements) {
+  async createPaymentPayload(x402Version, paymentRequirements, context) {
     const assetTransferMethod = paymentRequirements.extra?.assetTransferMethod ?? "eip3009";
     if (assetTransferMethod === "permit2") {
-      return createPermit2Payload(this.signer, x402Version, paymentRequirements);
+      const result = await createPermit2Payload(this.signer, x402Version, paymentRequirements);
+      const eip2612Extensions = await this.trySignEip2612Permit(
+        paymentRequirements,
+        result,
+        context
+      );
+      if (eip2612Extensions) {
+        return {
+          ...result,
+          extensions: eip2612Extensions
+        };
+      }
+      return result;
     }
     return createEIP3009Payload(this.signer, x402Version, paymentRequirements);
   }
+  /**
+   * Attempts to sign an EIP-2612 permit for gasless Permit2 approval.
+   *
+   * Returns extension data if:
+   * 1. Server advertises eip2612GasSponsoring
+   * 2. Signer has readContract capability
+   * 3. Current Permit2 allowance is insufficient
+   *
+   * Returns undefined if the extension should not be used.
+   *
+   * @param requirements - The payment requirements from the server
+   * @param result - The payment payload result from the scheme
+   * @param context - Optional context containing server extensions and metadata
+   * @returns Extension data for EIP-2612 gas sponsoring, or undefined if not applicable
+   */
+  async trySignEip2612Permit(requirements, result, context) {
+    if (!context?.extensions?.[import_extensions.EIP2612_GAS_SPONSORING.key]) {
+      return void 0;
+    }
+    const tokenName = requirements.extra?.name;
+    const tokenVersion = requirements.extra?.version;
+    if (!tokenName || !tokenVersion) {
+      return void 0;
+    }
+    const chainId = parseInt(requirements.network.split(":")[1]);
+    const tokenAddress = (0, import_viem7.getAddress)(requirements.asset);
+    try {
+      const allowance = await this.signer.readContract({
+        address: tokenAddress,
+        abi: erc20AllowanceAbi2,
+        functionName: "allowance",
+        args: [this.signer.address, PERMIT2_ADDRESS]
+      });
+      if (allowance >= BigInt(requirements.amount)) {
+        return void 0;
+      }
+    } catch {
+    }
+    const permit2Auth = result.payload?.permit2Authorization;
+    const deadline = permit2Auth?.deadline ?? Math.floor(Date.now() / 1e3 + requirements.maxTimeoutSeconds).toString();
+    const info = await signEip2612Permit(
+      this.signer,
+      tokenAddress,
+      tokenName,
+      tokenVersion,
+      chainId,
+      deadline
+    );
+    return {
+      [import_extensions.EIP2612_GAS_SPONSORING.key]: { info }
+    };
+  }
 };
 
 // src/signer.ts
-function toClientEvmSigner(signer) {
-  return signer;
+function toClientEvmSigner(signer, publicClient) {
+  const readContract = signer.readContract ?? publicClient?.readContract.bind(publicClient);
+  if (!readContract) {
+    throw new Error(
+      "toClientEvmSigner requires either a signer with readContract or a publicClient. Use createWalletClient(...).extend(publicActions) or pass a publicClient."
+    );
+  }
+  return {
+    address: signer.address,
+    signTypedData: (msg) => signer.signTypedData(msg),
+    readContract
+  };
 }
@@ -498,0 +658,0 @@ function toFacilitatorEvmSigner(client) {

dist/cjs/v1/index.d.ts

 export { ExactEvmSchemeV1 } from '../exact/v1/client/index.js';
 import '@x402/core/types';
-import '../signer-5OVDxViv.js';
+import '../signer-3KGwtdNT.js';
 
@@ -5,0 +5,0 @@ declare const EVM_NETWORK_CHAIN_ID_MAP: {

dist/cjs/v1/index.js.map

@@ -1,1 +0,1 @@
-{"version":3,"sources":["../../../src/v1/index.ts","../../../src/exact/v1/client/scheme.ts","../../../src/constants.ts","../../../src/utils.ts","../../../src/exact/v1/facilitator/scheme.ts"],"sourcesContent":["export { ExactEvmSchemeV1 } from \"../exact/v1\";\n\nexport const EVM_NETWORK_CHAIN_ID_MAP = {\n  ethereum: 1,\n  sepolia: 11155111,\n  abstract: 2741,\n  \"abstract-testnet\": 11124,\n  \"base-sepolia\": 84532,\n  base: 8453,\n  \"avalanche-fuji\": 43113,\n  avalanche: 43114,\n  iotex: 4689,\n  sei: 1329,\n  \"sei-testnet\": 1328,\n  polygon: 137,\n  \"polygon-amoy\": 80002,\n  peaq: 3338,\n  story: 1514,\n  educhain: 41923,\n  \"skale-base-sepolia\": 324705682,\n  megaeth: 4326,\n} as const;\n\nexport type EvmNetworkV1 = keyof typeof EVM_NETWORK_CHAIN_ID_MAP;\n\nexport const NETWORKS: string[] = Object.keys(EVM_NETWORK_CHAIN_ID_MAP);\n","import {\n  Network,\n  PaymentPayload,\n  PaymentRequirements,\n  SchemeNetworkClient,\n} from \"@x402/core/types\";\nimport { PaymentRequirementsV1 } from \"@x402/core/types/v1\";\nimport { getAddress } from \"viem\";\nimport { authorizationTypes } from \"../../../constants\";\nimport { ClientEvmSigner } from \"../../../signer\";\nimport { ExactEvmPayloadV1 } from \"../../../types\";\nimport { createNonce, getEvmChainId } from \"../../../utils\";\nimport { EvmNetworkV1 } from \"../../../v1\";\n\n/**\n * EVM client implementation for the Exact payment scheme (V1).\n */\nexport class ExactEvmSchemeV1 implements SchemeNetworkClient {\n  readonly scheme = \"exact\";\n\n  /**\n   * Creates a new ExactEvmClientV1 instance.\n   *\n   * @param signer - The EVM signer for client operations\n   */\n  constructor(private readonly signer: ClientEvmSigner) {}\n\n  /**\n   * Creates a payment payload for the Exact scheme (V1).\n   *\n   * @param x402Version - The x402 protocol version\n   * @param paymentRequirements - The payment requirements\n   * @returns Promise resolving to a payment payload\n   */\n  async createPaymentPayload(\n    x402Version: number,\n    paymentRequirements: PaymentRequirements,\n  ): Promise<\n    Pick<PaymentPayload, \"x402Version\" | \"payload\"> & { scheme: string; network: Network }\n  > {\n    const selectedV1 = paymentRequirements as unknown as PaymentRequirementsV1;\n    const nonce = createNonce();\n    const now = Math.floor(Date.now() / 1000);\n\n    const authorization: ExactEvmPayloadV1[\"authorization\"] = {\n      from: this.signer.address,\n      to: getAddress(selectedV1.payTo),\n      value: selectedV1.maxAmountRequired,\n      validAfter: (now - 600).toString(), // 10 minutes before\n      validBefore: (now + selectedV1.maxTimeoutSeconds).toString(),\n      nonce,\n    };\n\n    // Sign the authorization\n    const signature = await this.signAuthorization(authorization, selectedV1);\n\n    const payload: ExactEvmPayloadV1 = {\n      authorization,\n      signature,\n    };\n\n    return {\n      x402Version,\n      scheme: selectedV1.scheme,\n      network: selectedV1.network,\n      payload,\n    };\n  }\n\n  /**\n   * Sign the EIP-3009 authorization using EIP-712\n   *\n   * @param authorization - The authorization to sign\n   * @param requirements - The payment requirements\n   * @returns Promise resolving to the signature\n   */\n  private async signAuthorization(\n    authorization: ExactEvmPayloadV1[\"authorization\"],\n    requirements: PaymentRequirementsV1,\n  ): Promise<`0x${string}`> {\n    const chainId = getEvmChainId(requirements.network as EvmNetworkV1);\n\n    if (!requirements.extra?.name || !requirements.extra?.version) {\n      throw new Error(\n        `EIP-712 domain parameters (name, version) are required in payment requirements for asset ${requirements.asset}`,\n      );\n    }\n\n    const { name, version } = requirements.extra;\n\n    const domain = {\n      name,\n      version,\n      chainId,\n      verifyingContract: getAddress(requirements.asset),\n    };\n\n    const message = {\n      from: getAddress(authorization.from),\n      to: getAddress(authorization.to),\n      value: BigInt(authorization.value),\n      validAfter: BigInt(authorization.validAfter),\n      validBefore: BigInt(authorization.validBefore),\n      nonce: authorization.nonce,\n    };\n\n    return await this.signer.signTypedData({\n      domain,\n      types: authorizationTypes,\n      primaryType: \"TransferWithAuthorization\",\n      message,\n    });\n  }\n}\n","// EIP-3009 TransferWithAuthorization types for EIP-712 signing\nexport const authorizationTypes = {\n  TransferWithAuthorization: [\n    { name: \"from\", type: \"address\" },\n    { name: \"to\", type: \"address\" },\n    { name: \"value\", type: \"uint256\" },\n    { name: \"validAfter\", type: \"uint256\" },\n    { name: \"validBefore\", type: \"uint256\" },\n    { name: \"nonce\", type: \"bytes32\" },\n  ],\n} as const;\n\n/**\n * Permit2 EIP-712 types for signing PermitWitnessTransferFrom.\n * Must match the exact format expected by the Permit2 contract.\n * Note: Types must be in ALPHABETICAL order after the primary type (TokenPermissions < Witness).\n */\nexport const permit2WitnessTypes = {\n  PermitWitnessTransferFrom: [\n    { name: \"permitted\", type: \"TokenPermissions\" },\n    { name: \"spender\", type: \"address\" },\n    { name: \"nonce\", type: \"uint256\" },\n    { name: \"deadline\", type: \"uint256\" },\n    { name: \"witness\", type: \"Witness\" },\n  ],\n  TokenPermissions: [\n    { name: \"token\", type: \"address\" },\n    { name: \"amount\", type: \"uint256\" },\n  ],\n  Witness: [\n    { name: \"to\", type: \"address\" },\n    { name: \"validAfter\", type: \"uint256\" },\n    { name: \"extra\", type: \"bytes\" },\n  ],\n} as const;\n\n// EIP3009 ABI for transferWithAuthorization function\nexport const eip3009ABI = [\n  {\n    inputs: [\n      { name: \"from\", type: \"address\" },\n      { name: \"to\", type: \"address\" },\n      { name: \"value\", type: \"uint256\" },\n      { name: \"validAfter\", type: \"uint256\" },\n      { name: \"validBefore\", type: \"uint256\" },\n      { name: \"nonce\", type: \"bytes32\" },\n      { name: \"v\", type: \"uint8\" },\n      { name: \"r\", type: \"bytes32\" },\n      { name: \"s\", type: \"bytes32\" },\n    ],\n    name: \"transferWithAuthorization\",\n    outputs: [],\n    stateMutability: \"nonpayable\",\n    type: \"function\",\n  },\n  {\n    inputs: [\n      { name: \"from\", type: \"address\" },\n      { name: \"to\", type: \"address\" },\n      { name: \"value\", type: \"uint256\" },\n      { name: \"validAfter\", type: \"uint256\" },\n      { name: \"validBefore\", type: \"uint256\" },\n      { name: \"nonce\", type: \"bytes32\" },\n      { name: \"signature\", type: \"bytes\" },\n    ],\n    name: \"transferWithAuthorization\",\n    outputs: [],\n    stateMutability: \"nonpayable\",\n    type: \"function\",\n  },\n  {\n    inputs: [{ name: \"account\", type: \"address\" }],\n    name: \"balanceOf\",\n    outputs: [{ name: \"\", type: \"uint256\" }],\n    stateMutability: \"view\",\n    type: \"function\",\n  },\n  {\n    inputs: [],\n    name: \"version\",\n    outputs: [{ name: \"\", type: \"string\" }],\n    stateMutability: \"view\",\n    type: \"function\",\n  },\n] as const;\n\n/**\n * Canonical Permit2 contract address.\n * Same address on all EVM chains via CREATE2 deployment.\n *\n * @see https://github.com/Uniswap/permit2\n */\nexport const PERMIT2_ADDRESS = \"0x000000000022D473030F116dDEE9F6B43aC78BA3\" as const;\n\n/**\n * x402ExactPermit2Proxy contract address.\n * Vanity address: 0x4020...0001 for easy recognition.\n * This address is deterministic based on:\n * - Arachnid's deterministic deployer (0x4e59b44847b379578588920cA78FbF26c0B4956C)\n * - Vanity-mined salt for prefix 0x4020 and suffix 0001\n * - Contract bytecode + constructor args (PERMIT2_ADDRESS)\n */\nexport const x402ExactPermit2ProxyAddress = \"0x4020615294c913F045dc10f0a5cdEbd86c280001\" as const;\n\n/**\n * x402UptoPermit2Proxy contract address.\n * Vanity address: 0x4020...0002 for easy recognition.\n * This address is deterministic based on:\n * - Arachnid's deterministic deployer (0x4e59b44847b379578588920cA78FbF26c0B4956C)\n * - Vanity-mined salt for prefix 0x4020 and suffix 0002\n * - Contract bytecode + constructor args (PERMIT2_ADDRESS)\n */\nexport const x402UptoPermit2ProxyAddress = \"0x4020633461b2895a48930Ff97eE8fCdE8E520002\" as const;\n\n/**\n * x402UptoPermit2Proxy ABI - settle function for upto payment scheme (variable amounts).\n */\nexport const x402UptoPermit2ProxyABI = [\n  {\n    type: \"function\",\n    name: \"PERMIT2\",\n    inputs: [],\n    outputs: [{ name: \"\", type: \"address\", internalType: \"contract ISignatureTransfer\" }],\n    stateMutability: \"view\",\n  },\n  {\n    type: \"function\",\n    name: \"WITNESS_TYPEHASH\",\n    inputs: [],\n    outputs: [{ name: \"\", type: \"bytes32\", internalType: \"bytes32\" }],\n    stateMutability: \"view\",\n  },\n  {\n    type: \"function\",\n    name: \"WITNESS_TYPE_STRING\",\n    inputs: [],\n    outputs: [{ name: \"\", type: \"string\", internalType: \"string\" }],\n    stateMutability: \"view\",\n  },\n  {\n    type: \"function\",\n    name: \"initialize\",\n    inputs: [{ name: \"_permit2\", type: \"address\", internalType: \"address\" }],\n    outputs: [],\n    stateMutability: \"nonpayable\",\n  },\n  {\n    type: \"function\",\n    name: \"settle\",\n    inputs: [\n      {\n        name: \"permit\",\n        type: \"tuple\",\n        internalType: \"struct ISignatureTransfer.PermitTransferFrom\",\n        components: [\n          {\n            name: \"permitted\",\n            type: \"tuple\",\n            internalType: \"struct ISignatureTransfer.TokenPermissions\",\n            components: [\n              { name: \"token\", type: \"address\", internalType: \"address\" },\n              { name: \"amount\", type: \"uint256\", internalType: \"uint256\" },\n            ],\n          },\n          { name: \"nonce\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"deadline\", type: \"uint256\", internalType: \"uint256\" },\n        ],\n      },\n      { name: \"owner\", type: \"address\", internalType: \"address\" },\n      {\n        name: \"witness\",\n        type: \"tuple\",\n        internalType: \"struct x402BasePermit2Proxy.Witness\",\n        components: [\n          { name: \"to\", type: \"address\", internalType: \"address\" },\n          { name: \"validAfter\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"extra\", type: \"bytes\", internalType: \"bytes\" },\n        ],\n      },\n      { name: \"signature\", type: \"bytes\", internalType: \"bytes\" },\n    ],\n    outputs: [],\n    stateMutability: \"nonpayable\",\n  },\n  {\n    type: \"function\",\n    name: \"settleWithPermit\",\n    inputs: [\n      {\n        name: \"permit2612\",\n        type: \"tuple\",\n        internalType: \"struct x402BasePermit2Proxy.EIP2612Permit\",\n        components: [\n          { name: \"value\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"deadline\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"r\", type: \"bytes32\", internalType: \"bytes32\" },\n          { name: \"s\", type: \"bytes32\", internalType: \"bytes32\" },\n          { name: \"v\", type: \"uint8\", internalType: \"uint8\" },\n        ],\n      },\n      {\n        name: \"permit\",\n        type: \"tuple\",\n        internalType: \"struct ISignatureTransfer.PermitTransferFrom\",\n        components: [\n          {\n            name: \"permitted\",\n            type: \"tuple\",\n            internalType: \"struct ISignatureTransfer.TokenPermissions\",\n            components: [\n              { name: \"token\", type: \"address\", internalType: \"address\" },\n              { name: \"amount\", type: \"uint256\", internalType: \"uint256\" },\n            ],\n          },\n          { name: \"nonce\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"deadline\", type: \"uint256\", internalType: \"uint256\" },\n        ],\n      },\n      { name: \"owner\", type: \"address\", internalType: \"address\" },\n      {\n        name: \"witness\",\n        type: \"tuple\",\n        internalType: \"struct x402BasePermit2Proxy.Witness\",\n        components: [\n          { name: \"to\", type: \"address\", internalType: \"address\" },\n          { name: \"validAfter\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"extra\", type: \"bytes\", internalType: \"bytes\" },\n        ],\n      },\n      { name: \"signature\", type: \"bytes\", internalType: \"bytes\" },\n    ],\n    outputs: [],\n    stateMutability: \"nonpayable\",\n  },\n  { type: \"event\", name: \"Settled\", inputs: [], anonymous: false },\n  { type: \"event\", name: \"SettledWithPermit\", inputs: [], anonymous: false },\n  { type: \"error\", name: \"AlreadyInitialized\", inputs: [] },\n  { type: \"error\", name: \"AmountExceedsPermitted\", inputs: [] },\n  { type: \"error\", name: \"InvalidDestination\", inputs: [] },\n  { type: \"error\", name: \"InvalidOwner\", inputs: [] },\n  { type: \"error\", name: \"InvalidPermit2Address\", inputs: [] },\n  { type: \"error\", name: \"PaymentTooEarly\", inputs: [] },\n  { type: \"error\", name: \"ReentrancyGuardReentrantCall\", inputs: [] },\n] as const;\n\n/**\n * x402ExactPermit2Proxy ABI - settle function for exact payment scheme.\n */\nexport const x402ExactPermit2ProxyABI = [\n  {\n    type: \"function\",\n    name: \"PERMIT2\",\n    inputs: [],\n    outputs: [{ name: \"\", type: \"address\", internalType: \"contract ISignatureTransfer\" }],\n    stateMutability: \"view\",\n  },\n  {\n    type: \"function\",\n    name: \"WITNESS_TYPEHASH\",\n    inputs: [],\n    outputs: [{ name: \"\", type: \"bytes32\", internalType: \"bytes32\" }],\n    stateMutability: \"view\",\n  },\n  {\n    type: \"function\",\n    name: \"WITNESS_TYPE_STRING\",\n    inputs: [],\n    outputs: [{ name: \"\", type: \"string\", internalType: \"string\" }],\n    stateMutability: \"view\",\n  },\n  {\n    type: \"function\",\n    name: \"initialize\",\n    inputs: [{ name: \"_permit2\", type: \"address\", internalType: \"address\" }],\n    outputs: [],\n    stateMutability: \"nonpayable\",\n  },\n  {\n    type: \"function\",\n    name: \"settle\",\n    inputs: [\n      {\n        name: \"permit\",\n        type: \"tuple\",\n        internalType: \"struct ISignatureTransfer.PermitTransferFrom\",\n        components: [\n          {\n            name: \"permitted\",\n            type: \"tuple\",\n            internalType: \"struct ISignatureTransfer.TokenPermissions\",\n            components: [\n              { name: \"token\", type: \"address\", internalType: \"address\" },\n              { name: \"amount\", type: \"uint256\", internalType: \"uint256\" },\n            ],\n          },\n          { name: \"nonce\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"deadline\", type: \"uint256\", internalType: \"uint256\" },\n        ],\n      },\n      { name: \"owner\", type: \"address\", internalType: \"address\" },\n      {\n        name: \"witness\",\n        type: \"tuple\",\n        internalType: \"struct x402BasePermit2Proxy.Witness\",\n        components: [\n          { name: \"to\", type: \"address\", internalType: \"address\" },\n          { name: \"validAfter\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"extra\", type: \"bytes\", internalType: \"bytes\" },\n        ],\n      },\n      { name: \"signature\", type: \"bytes\", internalType: \"bytes\" },\n    ],\n    outputs: [],\n    stateMutability: \"nonpayable\",\n  },\n  {\n    type: \"function\",\n    name: \"settleWithPermit\",\n    inputs: [\n      {\n        name: \"permit2612\",\n        type: \"tuple\",\n        internalType: \"struct x402BasePermit2Proxy.EIP2612Permit\",\n        components: [\n          { name: \"value\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"deadline\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"r\", type: \"bytes32\", internalType: \"bytes32\" },\n          { name: \"s\", type: \"bytes32\", internalType: \"bytes32\" },\n          { name: \"v\", type: \"uint8\", internalType: \"uint8\" },\n        ],\n      },\n      {\n        name: \"permit\",\n        type: \"tuple\",\n        internalType: \"struct ISignatureTransfer.PermitTransferFrom\",\n        components: [\n          {\n            name: \"permitted\",\n            type: \"tuple\",\n            internalType: \"struct ISignatureTransfer.TokenPermissions\",\n            components: [\n              { name: \"token\", type: \"address\", internalType: \"address\" },\n              { name: \"amount\", type: \"uint256\", internalType: \"uint256\" },\n            ],\n          },\n          { name: \"nonce\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"deadline\", type: \"uint256\", internalType: \"uint256\" },\n        ],\n      },\n      { name: \"owner\", type: \"address\", internalType: \"address\" },\n      {\n        name: \"witness\",\n        type: \"tuple\",\n        internalType: \"struct x402BasePermit2Proxy.Witness\",\n        components: [\n          { name: \"to\", type: \"address\", internalType: \"address\" },\n          { name: \"validAfter\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"extra\", type: \"bytes\", internalType: \"bytes\" },\n        ],\n      },\n      { name: \"signature\", type: \"bytes\", internalType: \"bytes\" },\n    ],\n    outputs: [],\n    stateMutability: \"nonpayable\",\n  },\n  { type: \"event\", name: \"Settled\", inputs: [], anonymous: false },\n  { type: \"event\", name: \"SettledWithPermit\", inputs: [], anonymous: false },\n  { type: \"error\", name: \"AlreadyInitialized\", inputs: [] },\n  { type: \"error\", name: \"InvalidDestination\", inputs: [] },\n  { type: \"error\", name: \"InvalidOwner\", inputs: [] },\n  { type: \"error\", name: \"InvalidPermit2Address\", inputs: [] },\n  { type: \"error\", name: \"PaymentTooEarly\", inputs: [] },\n  { type: \"error\", name: \"ReentrancyGuardReentrantCall\", inputs: [] },\n] as const;\n","import { toHex } from \"viem\";\nimport { EVM_NETWORK_CHAIN_ID_MAP, EvmNetworkV1 } from \"./v1\";\n\n/**\n * Extract chain ID from network string (e.g., \"base-sepolia\" -> 84532)\n * Used by v1 implementations\n *\n * @param network - The network identifier\n * @returns The numeric chain ID\n * @throws Error if the network is not supported\n */\nexport function getEvmChainId(network: EvmNetworkV1): number {\n  const chainId = EVM_NETWORK_CHAIN_ID_MAP[network];\n  if (!chainId) {\n    throw new Error(`Unsupported network: ${network}`);\n  }\n  return chainId;\n}\n\n/**\n * Get the crypto object from the global scope.\n *\n * @returns The crypto object\n * @throws Error if crypto API is not available\n */\nfunction getCrypto(): Crypto {\n  const cryptoObj = globalThis.crypto as Crypto | undefined;\n  if (!cryptoObj) {\n    throw new Error(\"Crypto API not available\");\n  }\n  return cryptoObj;\n}\n\n/**\n * Create a random 32-byte nonce for EIP-3009 authorization.\n *\n * @returns A hex-encoded 32-byte nonce\n */\nexport function createNonce(): `0x${string}` {\n  return toHex(getCrypto().getRandomValues(new Uint8Array(32)));\n}\n\n/**\n * Creates a random 256-bit nonce for Permit2.\n * Permit2 uses uint256 nonces (not bytes32 like EIP-3009).\n *\n * @returns A string representation of the random nonce\n */\nexport function createPermit2Nonce(): string {\n  const randomBytes = getCrypto().getRandomValues(new Uint8Array(32));\n  return BigInt(toHex(randomBytes)).toString();\n}\n","import {\n  PaymentPayload,\n  PaymentPayloadV1,\n  PaymentRequirements,\n  SchemeNetworkFacilitator,\n  SettleResponse,\n  VerifyResponse,\n} from \"@x402/core/types\";\nimport { PaymentRequirementsV1 } from \"@x402/core/types/v1\";\nimport { getAddress, Hex, isAddressEqual, parseErc6492Signature, parseSignature } from \"viem\";\nimport { authorizationTypes, eip3009ABI } from \"../../../constants\";\nimport { FacilitatorEvmSigner } from \"../../../signer\";\nimport { ExactEvmPayloadV1 } from \"../../../types\";\nimport { getEvmChainId } from \"../../../utils\";\nimport { EvmNetworkV1 } from \"../../../v1\";\n\nexport interface ExactEvmSchemeV1Config {\n  /**\n   * If enabled, the facilitator will deploy ERC-4337 smart wallets\n   * via EIP-6492 when encountering undeployed contract signatures.\n   *\n   * @default false\n   */\n  deployERC4337WithEIP6492?: boolean;\n}\n\n/**\n * EVM facilitator implementation for the Exact payment scheme (V1).\n */\nexport class ExactEvmSchemeV1 implements SchemeNetworkFacilitator {\n  readonly scheme = \"exact\";\n  readonly caipFamily = \"eip155:*\";\n  private readonly config: Required<ExactEvmSchemeV1Config>;\n\n  /**\n   * Creates a new ExactEvmFacilitatorV1 instance.\n   *\n   * @param signer - The EVM signer for facilitator operations\n   * @param config - Optional configuration for the facilitator\n   */\n  constructor(\n    private readonly signer: FacilitatorEvmSigner,\n    config?: ExactEvmSchemeV1Config,\n  ) {\n    this.config = {\n      deployERC4337WithEIP6492: config?.deployERC4337WithEIP6492 ?? false,\n    };\n  }\n\n  /**\n   * Get mechanism-specific extra data for the supported kinds endpoint.\n   * For EVM, no extra data is needed.\n   *\n   * @param _ - The network identifier (unused for EVM)\n   * @returns undefined (EVM has no extra data)\n   */\n  getExtra(_: string): Record<string, unknown> | undefined {\n    return undefined;\n  }\n\n  /**\n   * Get signer addresses used by this facilitator.\n   * Returns all addresses this facilitator can use for signing/settling transactions.\n   *\n   * @param _ - The network identifier (unused for EVM, addresses are network-agnostic)\n   * @returns Array of facilitator wallet addresses\n   */\n  getSigners(_: string): string[] {\n    return [...this.signer.getAddresses()];\n  }\n\n  /**\n   * Verifies a payment payload (V1).\n   *\n   * @param payload - The payment payload to verify\n   * @param requirements - The payment requirements\n   * @returns Promise resolving to verification response\n   */\n  async verify(\n    payload: PaymentPayload,\n    requirements: PaymentRequirements,\n  ): Promise<VerifyResponse> {\n    const requirementsV1 = requirements as unknown as PaymentRequirementsV1;\n    const payloadV1 = payload as unknown as PaymentPayloadV1;\n    const exactEvmPayload = payload.payload as ExactEvmPayloadV1;\n\n    // Verify scheme matches\n    if (payloadV1.scheme !== \"exact\" || requirements.scheme !== \"exact\") {\n      return {\n        isValid: false,\n        invalidReason: \"unsupported_scheme\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    // Get chain configuration\n    let chainId: number;\n    try {\n      chainId = getEvmChainId(payloadV1.network as EvmNetworkV1);\n    } catch {\n      return {\n        isValid: false,\n        invalidReason: `invalid_network`,\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    if (!requirements.extra?.name || !requirements.extra?.version) {\n      return {\n        isValid: false,\n        invalidReason: \"missing_eip712_domain\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    const { name, version } = requirements.extra;\n    const erc20Address = getAddress(requirements.asset);\n\n    // Verify network matches\n    if (payloadV1.network !== requirements.network) {\n      return {\n        isValid: false,\n        invalidReason: \"network_mismatch\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    // Build typed data for signature verification\n    const permitTypedData = {\n      types: authorizationTypes,\n      primaryType: \"TransferWithAuthorization\" as const,\n      domain: {\n        name,\n        version,\n        chainId,\n        verifyingContract: erc20Address,\n      },\n      message: {\n        from: exactEvmPayload.authorization.from,\n        to: exactEvmPayload.authorization.to,\n        value: BigInt(exactEvmPayload.authorization.value),\n        validAfter: BigInt(exactEvmPayload.authorization.validAfter),\n        validBefore: BigInt(exactEvmPayload.authorization.validBefore),\n        nonce: exactEvmPayload.authorization.nonce,\n      },\n    };\n\n    // Verify signature\n    try {\n      const recoveredAddress = await this.signer.verifyTypedData({\n        address: exactEvmPayload.authorization.from,\n        ...permitTypedData,\n        signature: exactEvmPayload.signature!,\n      });\n\n      if (!recoveredAddress) {\n        return {\n          isValid: false,\n          invalidReason: \"invalid_exact_evm_payload_signature\",\n          payer: exactEvmPayload.authorization.from,\n        };\n      }\n    } catch {\n      // Signature verification failed - could be an undeployed smart wallet\n      // Check if smart wallet is deployed\n      const signature = exactEvmPayload.signature!;\n      const signatureLength = signature.startsWith(\"0x\") ? signature.length - 2 : signature.length;\n      const isSmartWallet = signatureLength > 130; // 65 bytes = 130 hex chars for EOA\n\n      if (isSmartWallet) {\n        const payerAddress = exactEvmPayload.authorization.from;\n        const bytecode = await this.signer.getCode({ address: payerAddress });\n\n        if (!bytecode || bytecode === \"0x\") {\n          // Wallet is not deployed. Check if it's EIP-6492 with deployment info.\n          // EIP-6492 signatures contain factory address and calldata needed for deployment.\n          // Non-EIP-6492 undeployed wallets cannot succeed (no way to deploy them).\n          const erc6492Data = parseErc6492Signature(signature);\n          const hasDeploymentInfo =\n            erc6492Data.address &&\n            erc6492Data.data &&\n            !isAddressEqual(erc6492Data.address, \"0x0000000000000000000000000000000000000000\");\n\n          if (!hasDeploymentInfo) {\n            // Non-EIP-6492 undeployed smart wallet - will always fail at settlement\n            // since EIP-3009 requires on-chain EIP-1271 validation\n            return {\n              isValid: false,\n              invalidReason: \"invalid_exact_evm_payload_undeployed_smart_wallet\",\n              payer: payerAddress,\n            };\n          }\n          // EIP-6492 signature with deployment info - allow through\n          // Facilitators with sponsored deployment support can handle this in settle()\n        } else {\n          // Wallet is deployed but signature still failed - invalid signature\n          return {\n            isValid: false,\n            invalidReason: \"invalid_exact_evm_payload_signature\",\n            payer: exactEvmPayload.authorization.from,\n          };\n        }\n      } else {\n        // EOA signature failed\n        return {\n          isValid: false,\n          invalidReason: \"invalid_exact_evm_payload_signature\",\n          payer: exactEvmPayload.authorization.from,\n        };\n      }\n    }\n\n    // Verify payment recipient matches\n    if (getAddress(exactEvmPayload.authorization.to) !== getAddress(requirements.payTo)) {\n      return {\n        isValid: false,\n        invalidReason: \"invalid_exact_evm_payload_recipient_mismatch\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    // Verify validBefore is in the future (with 6 second buffer for block time)\n    const now = Math.floor(Date.now() / 1000);\n    if (BigInt(exactEvmPayload.authorization.validBefore) < BigInt(now + 6)) {\n      return {\n        isValid: false,\n        invalidReason: \"invalid_exact_evm_payload_authorization_valid_before\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    // Verify validAfter is not in the future\n    if (BigInt(exactEvmPayload.authorization.validAfter) > BigInt(now)) {\n      return {\n        isValid: false,\n        invalidReason: \"invalid_exact_evm_payload_authorization_valid_after\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    // Check balance\n    try {\n      const balance = (await this.signer.readContract({\n        address: erc20Address,\n        abi: eip3009ABI,\n        functionName: \"balanceOf\",\n        args: [exactEvmPayload.authorization.from],\n      })) as bigint;\n\n      if (BigInt(balance) < BigInt(requirementsV1.maxAmountRequired)) {\n        return {\n          isValid: false,\n          invalidReason: \"insufficient_funds\",\n          invalidMessage: `Insufficient funds to complete the payment. Required: ${requirementsV1.maxAmountRequired} ${requirements.asset}, Available: ${balance.toString()} ${requirements.asset}. Please add funds to your wallet and try again.`,\n          payer: exactEvmPayload.authorization.from,\n        };\n      }\n    } catch {\n      // If we can't check balance, continue with other validations\n    }\n\n    // Verify amount is sufficient\n    if (BigInt(exactEvmPayload.authorization.value) < BigInt(requirementsV1.maxAmountRequired)) {\n      return {\n        isValid: false,\n        invalidReason: \"invalid_exact_evm_payload_authorization_value\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    return {\n      isValid: true,\n      invalidReason: undefined,\n      payer: exactEvmPayload.authorization.from,\n    };\n  }\n\n  /**\n   * Settles a payment by executing the transfer (V1).\n   *\n   * @param payload - The payment payload to settle\n   * @param requirements - The payment requirements\n   * @returns Promise resolving to settlement response\n   */\n  async settle(\n    payload: PaymentPayload,\n    requirements: PaymentRequirements,\n  ): Promise<SettleResponse> {\n    const payloadV1 = payload as unknown as PaymentPayloadV1;\n    const exactEvmPayload = payload.payload as ExactEvmPayloadV1;\n\n    // Re-verify before settling\n    const valid = await this.verify(payload, requirements);\n    if (!valid.isValid) {\n      return {\n        success: false,\n        network: payloadV1.network,\n        transaction: \"\",\n        errorReason: valid.invalidReason ?? \"invalid_scheme\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    try {\n      // Parse ERC-6492 signature if applicable\n      const parseResult = parseErc6492Signature(exactEvmPayload.signature!);\n      const { signature, address: factoryAddress, data: factoryCalldata } = parseResult;\n\n      // Deploy ERC-4337 smart wallet via EIP-6492 if configured and needed\n      if (\n        this.config.deployERC4337WithEIP6492 &&\n        factoryAddress &&\n        factoryCalldata &&\n        !isAddressEqual(factoryAddress, \"0x0000000000000000000000000000000000000000\")\n      ) {\n        // Check if smart wallet is already deployed\n        const payerAddress = exactEvmPayload.authorization.from;\n        const bytecode = await this.signer.getCode({ address: payerAddress });\n\n        if (!bytecode || bytecode === \"0x\") {\n          // Wallet not deployed - attempt deployment\n          try {\n            console.log(`Deploying ERC-4337 smart wallet for ${payerAddress} via EIP-6492`);\n\n            // Send the factory calldata directly as a transaction\n            // The factoryCalldata already contains the complete encoded function call\n            const deployTx = await this.signer.sendTransaction({\n              to: factoryAddress as Hex,\n              data: factoryCalldata as Hex,\n            });\n\n            // Wait for deployment transaction\n            await this.signer.waitForTransactionReceipt({ hash: deployTx });\n            console.log(`Successfully deployed smart wallet for ${payerAddress}`);\n          } catch (deployError) {\n            console.error(\"Smart wallet deployment failed:\", deployError);\n            // Deployment failed - cannot proceed\n            throw deployError;\n          }\n        } else {\n          console.log(`Smart wallet for ${payerAddress} already deployed, skipping deployment`);\n        }\n      }\n\n      // Determine if this is an ECDSA signature (EOA) or smart wallet signature\n      // ECDSA signatures are exactly 65 bytes (130 hex chars without 0x)\n      const signatureLength = signature.startsWith(\"0x\") ? signature.length - 2 : signature.length;\n      const isECDSA = signatureLength === 130;\n\n      let tx: Hex;\n      if (isECDSA) {\n        // For EOA wallets, parse signature into v, r, s and use that overload\n        const parsedSig = parseSignature(signature);\n\n        tx = await this.signer.writeContract({\n          address: getAddress(requirements.asset),\n          abi: eip3009ABI,\n          functionName: \"transferWithAuthorization\",\n          args: [\n            getAddress(exactEvmPayload.authorization.from),\n            getAddress(exactEvmPayload.authorization.to),\n            BigInt(exactEvmPayload.authorization.value),\n            BigInt(exactEvmPayload.authorization.validAfter),\n            BigInt(exactEvmPayload.authorization.validBefore),\n            exactEvmPayload.authorization.nonce,\n            (parsedSig.v as number | undefined) || parsedSig.yParity,\n            parsedSig.r,\n            parsedSig.s,\n          ],\n        });\n      } else {\n        // For smart wallets, use the bytes signature overload\n        // The signature contains WebAuthn/P256 or other ERC-1271 compatible signature data\n        tx = await this.signer.writeContract({\n          address: getAddress(requirements.asset),\n          abi: eip3009ABI,\n          functionName: \"transferWithAuthorization\",\n          args: [\n            getAddress(exactEvmPayload.authorization.from),\n            getAddress(exactEvmPayload.authorization.to),\n            BigInt(exactEvmPayload.authorization.value),\n            BigInt(exactEvmPayload.authorization.validAfter),\n            BigInt(exactEvmPayload.authorization.validBefore),\n            exactEvmPayload.authorization.nonce,\n            signature,\n          ],\n        });\n      }\n\n      // Wait for transaction confirmation\n      const receipt = await this.signer.waitForTransactionReceipt({ hash: tx });\n\n      if (receipt.status !== \"success\") {\n        return {\n          success: false,\n          errorReason: \"invalid_transaction_state\",\n          transaction: tx,\n          network: payloadV1.network,\n          payer: exactEvmPayload.authorization.from,\n        };\n      }\n\n      return {\n        success: true,\n        transaction: tx,\n        network: payloadV1.network,\n        payer: exactEvmPayload.authorization.from,\n      };\n    } catch (error) {\n      console.error(\"Failed to settle transaction:\", error);\n      return {\n        success: false,\n        errorReason: \"transaction_failed\",\n        transaction: \"\",\n        network: payloadV1.network,\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n  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+{"version":3,"sources":["../../../src/v1/index.ts","../../../src/exact/v1/client/scheme.ts","../../../src/constants.ts","../../../src/utils.ts","../../../src/exact/v1/facilitator/scheme.ts"],"sourcesContent":["export { ExactEvmSchemeV1 } from \"../exact/v1\";\n\nexport const EVM_NETWORK_CHAIN_ID_MAP = {\n  ethereum: 1,\n  sepolia: 11155111,\n  abstract: 2741,\n  \"abstract-testnet\": 11124,\n  \"base-sepolia\": 84532,\n  base: 8453,\n  \"avalanche-fuji\": 43113,\n  avalanche: 43114,\n  iotex: 4689,\n  sei: 1329,\n  \"sei-testnet\": 1328,\n  polygon: 137,\n  \"polygon-amoy\": 80002,\n  peaq: 3338,\n  story: 1514,\n  educhain: 41923,\n  \"skale-base-sepolia\": 324705682,\n  megaeth: 4326,\n} as const;\n\nexport type EvmNetworkV1 = keyof typeof EVM_NETWORK_CHAIN_ID_MAP;\n\nexport const NETWORKS: string[] = Object.keys(EVM_NETWORK_CHAIN_ID_MAP);\n","import {\n  Network,\n  PaymentPayload,\n  PaymentRequirements,\n  SchemeNetworkClient,\n} from \"@x402/core/types\";\nimport { PaymentRequirementsV1 } from \"@x402/core/types/v1\";\nimport { getAddress } from \"viem\";\nimport { authorizationTypes } from \"../../../constants\";\nimport { ClientEvmSigner } from \"../../../signer\";\nimport { ExactEvmPayloadV1 } from \"../../../types\";\nimport { createNonce, getEvmChainId } from \"../../../utils\";\nimport { EvmNetworkV1 } from \"../../../v1\";\n\n/**\n * EVM client implementation for the Exact payment scheme (V1).\n */\nexport class ExactEvmSchemeV1 implements SchemeNetworkClient {\n  readonly scheme = \"exact\";\n\n  /**\n   * Creates a new ExactEvmClientV1 instance.\n   *\n   * @param signer - The EVM signer for client operations\n   */\n  constructor(private readonly signer: ClientEvmSigner) {}\n\n  /**\n   * Creates a payment payload for the Exact scheme (V1).\n   *\n   * @param x402Version - The x402 protocol version\n   * @param paymentRequirements - The payment requirements\n   * @returns Promise resolving to a payment payload\n   */\n  async createPaymentPayload(\n    x402Version: number,\n    paymentRequirements: PaymentRequirements,\n  ): Promise<\n    Pick<PaymentPayload, \"x402Version\" | \"payload\"> & { scheme: string; network: Network }\n  > {\n    const selectedV1 = paymentRequirements as unknown as PaymentRequirementsV1;\n    const nonce = createNonce();\n    const now = Math.floor(Date.now() / 1000);\n\n    const authorization: ExactEvmPayloadV1[\"authorization\"] = {\n      from: this.signer.address,\n      to: getAddress(selectedV1.payTo),\n      value: selectedV1.maxAmountRequired,\n      validAfter: (now - 600).toString(), // 10 minutes before\n      validBefore: (now + selectedV1.maxTimeoutSeconds).toString(),\n      nonce,\n    };\n\n    // Sign the authorization\n    const signature = await this.signAuthorization(authorization, selectedV1);\n\n    const payload: ExactEvmPayloadV1 = {\n      authorization,\n      signature,\n    };\n\n    return {\n      x402Version,\n      scheme: selectedV1.scheme,\n      network: selectedV1.network,\n      payload,\n    };\n  }\n\n  /**\n   * Sign the EIP-3009 authorization using EIP-712\n   *\n   * @param authorization - The authorization to sign\n   * @param requirements - The payment requirements\n   * @returns Promise resolving to the signature\n   */\n  private async signAuthorization(\n    authorization: ExactEvmPayloadV1[\"authorization\"],\n    requirements: PaymentRequirementsV1,\n  ): Promise<`0x${string}`> {\n    const chainId = getEvmChainId(requirements.network as EvmNetworkV1);\n\n    if (!requirements.extra?.name || !requirements.extra?.version) {\n      throw new Error(\n        `EIP-712 domain parameters (name, version) are required in payment requirements for asset ${requirements.asset}`,\n      );\n    }\n\n    const { name, version } = requirements.extra;\n\n    const domain = {\n      name,\n      version,\n      chainId,\n      verifyingContract: getAddress(requirements.asset),\n    };\n\n    const message = {\n      from: getAddress(authorization.from),\n      to: getAddress(authorization.to),\n      value: BigInt(authorization.value),\n      validAfter: BigInt(authorization.validAfter),\n      validBefore: BigInt(authorization.validBefore),\n      nonce: authorization.nonce,\n    };\n\n    return await this.signer.signTypedData({\n      domain,\n      types: authorizationTypes,\n      primaryType: \"TransferWithAuthorization\",\n      message,\n    });\n  }\n}\n","// EIP-3009 TransferWithAuthorization types for EIP-712 signing\nexport const authorizationTypes = {\n  TransferWithAuthorization: [\n    { name: \"from\", type: \"address\" },\n    { name: \"to\", type: \"address\" },\n    { name: \"value\", type: \"uint256\" },\n    { name: \"validAfter\", type: \"uint256\" },\n    { name: \"validBefore\", type: \"uint256\" },\n    { name: \"nonce\", type: \"bytes32\" },\n  ],\n} as const;\n\n/**\n * Permit2 EIP-712 types for signing PermitWitnessTransferFrom.\n * Must match the exact format expected by the Permit2 contract.\n * Note: Types must be in ALPHABETICAL order after the primary type (TokenPermissions < Witness).\n */\nexport const permit2WitnessTypes = {\n  PermitWitnessTransferFrom: [\n    { name: \"permitted\", type: \"TokenPermissions\" },\n    { name: \"spender\", type: \"address\" },\n    { name: \"nonce\", type: \"uint256\" },\n    { name: \"deadline\", type: \"uint256\" },\n    { name: \"witness\", type: \"Witness\" },\n  ],\n  TokenPermissions: [\n    { name: \"token\", type: \"address\" },\n    { name: \"amount\", type: \"uint256\" },\n  ],\n  Witness: [\n    { name: \"to\", type: \"address\" },\n    { name: \"validAfter\", type: \"uint256\" },\n    { name: \"extra\", type: \"bytes\" },\n  ],\n} as const;\n\n// EIP3009 ABI for transferWithAuthorization function\nexport const eip3009ABI = [\n  {\n    inputs: [\n      { name: \"from\", type: \"address\" },\n      { name: \"to\", type: \"address\" },\n      { name: \"value\", type: \"uint256\" },\n      { name: \"validAfter\", type: \"uint256\" },\n      { name: \"validBefore\", type: \"uint256\" },\n      { name: \"nonce\", type: \"bytes32\" },\n      { name: \"v\", type: \"uint8\" },\n      { name: \"r\", type: \"bytes32\" },\n      { name: \"s\", type: \"bytes32\" },\n    ],\n    name: \"transferWithAuthorization\",\n    outputs: [],\n    stateMutability: \"nonpayable\",\n    type: \"function\",\n  },\n  {\n    inputs: [\n      { name: \"from\", type: \"address\" },\n      { name: \"to\", type: \"address\" },\n      { name: \"value\", type: \"uint256\" },\n      { name: \"validAfter\", type: \"uint256\" },\n      { name: \"validBefore\", type: \"uint256\" },\n      { name: \"nonce\", type: \"bytes32\" },\n      { name: \"signature\", type: \"bytes\" },\n    ],\n    name: \"transferWithAuthorization\",\n    outputs: [],\n    stateMutability: \"nonpayable\",\n    type: \"function\",\n  },\n  {\n    inputs: [{ name: \"account\", type: \"address\" }],\n    name: \"balanceOf\",\n    outputs: [{ name: \"\", type: \"uint256\" }],\n    stateMutability: \"view\",\n    type: \"function\",\n  },\n  {\n    inputs: [],\n    name: \"version\",\n    outputs: [{ name: \"\", type: \"string\" }],\n    stateMutability: \"view\",\n    type: \"function\",\n  },\n] as const;\n\n/**\n * EIP-2612 Permit EIP-712 types for signing token.permit().\n */\nexport const eip2612PermitTypes = {\n  Permit: [\n    { name: \"owner\", type: \"address\" },\n    { name: \"spender\", type: \"address\" },\n    { name: \"value\", type: \"uint256\" },\n    { name: \"nonce\", type: \"uint256\" },\n    { name: \"deadline\", type: \"uint256\" },\n  ],\n} as const;\n\n/**\n * EIP-2612 nonces ABI for querying current nonce.\n */\nexport const eip2612NoncesAbi = [\n  {\n    type: \"function\",\n    name: \"nonces\",\n    inputs: [{ name: \"owner\", type: \"address\" }],\n    outputs: [{ type: \"uint256\" }],\n    stateMutability: \"view\",\n  },\n] as const;\n\n/**\n * Canonical Permit2 contract address.\n * Same address on all EVM chains via CREATE2 deployment.\n *\n * @see https://github.com/Uniswap/permit2\n */\nexport const PERMIT2_ADDRESS = \"0x000000000022D473030F116dDEE9F6B43aC78BA3\" as const;\n\n/**\n * x402ExactPermit2Proxy contract address.\n * Vanity address: 0x4020...0001 for easy recognition.\n * This address is deterministic based on:\n * - Arachnid's deterministic deployer (0x4e59b44847b379578588920cA78FbF26c0B4956C)\n * - Vanity-mined salt for prefix 0x4020 and suffix 0001\n * - Contract bytecode + constructor args (PERMIT2_ADDRESS)\n */\nexport const x402ExactPermit2ProxyAddress = \"0x4020615294c913F045dc10f0a5cdEbd86c280001\" as const;\n\n/**\n * x402UptoPermit2Proxy contract address.\n * Vanity address: 0x4020...0002 for easy recognition.\n * This address is deterministic based on:\n * - Arachnid's deterministic deployer (0x4e59b44847b379578588920cA78FbF26c0B4956C)\n * - Vanity-mined salt for prefix 0x4020 and suffix 0002\n * - Contract bytecode + constructor args (PERMIT2_ADDRESS)\n */\nexport const x402UptoPermit2ProxyAddress = \"0x4020633461b2895a48930Ff97eE8fCdE8E520002\" as const;\n\n/**\n * x402UptoPermit2Proxy ABI - settle function for upto payment scheme (variable amounts).\n */\nexport const x402UptoPermit2ProxyABI = [\n  {\n    type: \"function\",\n    name: \"PERMIT2\",\n    inputs: [],\n    outputs: [{ name: \"\", type: \"address\", internalType: \"contract ISignatureTransfer\" }],\n    stateMutability: \"view\",\n  },\n  {\n    type: \"function\",\n    name: \"WITNESS_TYPEHASH\",\n    inputs: [],\n    outputs: [{ name: \"\", type: \"bytes32\", internalType: \"bytes32\" }],\n    stateMutability: \"view\",\n  },\n  {\n    type: \"function\",\n    name: \"WITNESS_TYPE_STRING\",\n    inputs: [],\n    outputs: [{ name: \"\", type: \"string\", internalType: \"string\" }],\n    stateMutability: \"view\",\n  },\n  {\n    type: \"function\",\n    name: \"initialize\",\n    inputs: [{ name: \"_permit2\", type: \"address\", internalType: \"address\" }],\n    outputs: [],\n    stateMutability: \"nonpayable\",\n  },\n  {\n    type: \"function\",\n    name: \"settle\",\n    inputs: [\n      {\n        name: \"permit\",\n        type: \"tuple\",\n        internalType: \"struct ISignatureTransfer.PermitTransferFrom\",\n        components: [\n          {\n            name: \"permitted\",\n            type: \"tuple\",\n            internalType: \"struct ISignatureTransfer.TokenPermissions\",\n            components: [\n              { name: \"token\", type: \"address\", internalType: \"address\" },\n              { name: \"amount\", type: \"uint256\", internalType: \"uint256\" },\n            ],\n          },\n          { name: \"nonce\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"deadline\", type: \"uint256\", internalType: \"uint256\" },\n        ],\n      },\n      { name: \"owner\", type: \"address\", internalType: \"address\" },\n      {\n        name: \"witness\",\n        type: \"tuple\",\n        internalType: \"struct x402BasePermit2Proxy.Witness\",\n        components: [\n          { name: \"to\", type: \"address\", internalType: \"address\" },\n          { name: \"validAfter\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"extra\", type: \"bytes\", internalType: \"bytes\" },\n        ],\n      },\n      { name: \"signature\", type: \"bytes\", internalType: \"bytes\" },\n    ],\n    outputs: [],\n    stateMutability: \"nonpayable\",\n  },\n  {\n    type: \"function\",\n    name: \"settleWithPermit\",\n    inputs: [\n      {\n        name: \"permit2612\",\n        type: \"tuple\",\n        internalType: \"struct x402BasePermit2Proxy.EIP2612Permit\",\n        components: [\n          { name: \"value\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"deadline\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"r\", type: \"bytes32\", internalType: \"bytes32\" },\n          { name: \"s\", type: \"bytes32\", internalType: \"bytes32\" },\n          { name: \"v\", type: \"uint8\", internalType: \"uint8\" },\n        ],\n      },\n      {\n        name: \"permit\",\n        type: \"tuple\",\n        internalType: \"struct ISignatureTransfer.PermitTransferFrom\",\n        components: [\n          {\n            name: \"permitted\",\n            type: \"tuple\",\n            internalType: \"struct ISignatureTransfer.TokenPermissions\",\n            components: [\n              { name: \"token\", type: \"address\", internalType: \"address\" },\n              { name: \"amount\", type: \"uint256\", internalType: \"uint256\" },\n            ],\n          },\n          { name: \"nonce\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"deadline\", type: \"uint256\", internalType: \"uint256\" },\n        ],\n      },\n      { name: \"owner\", type: \"address\", internalType: \"address\" },\n      {\n        name: \"witness\",\n        type: \"tuple\",\n        internalType: \"struct x402BasePermit2Proxy.Witness\",\n        components: [\n          { name: \"to\", type: \"address\", internalType: \"address\" },\n          { name: \"validAfter\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"extra\", type: \"bytes\", internalType: \"bytes\" },\n        ],\n      },\n      { name: \"signature\", type: \"bytes\", internalType: \"bytes\" },\n    ],\n    outputs: [],\n    stateMutability: \"nonpayable\",\n  },\n  { type: \"event\", name: \"Settled\", inputs: [], anonymous: false },\n  { type: \"event\", name: \"SettledWithPermit\", inputs: [], anonymous: false },\n  { type: \"error\", name: \"AlreadyInitialized\", inputs: [] },\n  { type: \"error\", name: \"AmountExceedsPermitted\", inputs: [] },\n  { type: \"error\", name: \"InvalidDestination\", inputs: [] },\n  { type: \"error\", name: \"InvalidOwner\", inputs: [] },\n  { type: \"error\", name: \"InvalidPermit2Address\", inputs: [] },\n  { type: \"error\", name: \"PaymentTooEarly\", inputs: [] },\n  { type: \"error\", name: \"ReentrancyGuardReentrantCall\", inputs: [] },\n] as const;\n\n/**\n * x402ExactPermit2Proxy ABI - settle function for exact payment scheme.\n */\nexport const x402ExactPermit2ProxyABI = [\n  {\n    type: \"function\",\n    name: \"PERMIT2\",\n    inputs: [],\n    outputs: [{ name: \"\", type: \"address\", internalType: \"contract ISignatureTransfer\" }],\n    stateMutability: \"view\",\n  },\n  {\n    type: \"function\",\n    name: \"WITNESS_TYPEHASH\",\n    inputs: [],\n    outputs: [{ name: \"\", type: \"bytes32\", internalType: \"bytes32\" }],\n    stateMutability: \"view\",\n  },\n  {\n    type: \"function\",\n    name: \"WITNESS_TYPE_STRING\",\n    inputs: [],\n    outputs: [{ name: \"\", type: \"string\", internalType: \"string\" }],\n    stateMutability: \"view\",\n  },\n  {\n    type: \"function\",\n    name: \"initialize\",\n    inputs: [{ name: \"_permit2\", type: \"address\", internalType: \"address\" }],\n    outputs: [],\n    stateMutability: \"nonpayable\",\n  },\n  {\n    type: \"function\",\n    name: \"settle\",\n    inputs: [\n      {\n        name: \"permit\",\n        type: \"tuple\",\n        internalType: \"struct ISignatureTransfer.PermitTransferFrom\",\n        components: [\n          {\n            name: \"permitted\",\n            type: \"tuple\",\n            internalType: \"struct ISignatureTransfer.TokenPermissions\",\n            components: [\n              { name: \"token\", type: \"address\", internalType: \"address\" },\n              { name: \"amount\", type: \"uint256\", internalType: \"uint256\" },\n            ],\n          },\n          { name: \"nonce\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"deadline\", type: \"uint256\", internalType: \"uint256\" },\n        ],\n      },\n      { name: \"owner\", type: \"address\", internalType: \"address\" },\n      {\n        name: \"witness\",\n        type: \"tuple\",\n        internalType: \"struct x402BasePermit2Proxy.Witness\",\n        components: [\n          { name: \"to\", type: \"address\", internalType: \"address\" },\n          { name: \"validAfter\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"extra\", type: \"bytes\", internalType: \"bytes\" },\n        ],\n      },\n      { name: \"signature\", type: \"bytes\", internalType: \"bytes\" },\n    ],\n    outputs: [],\n    stateMutability: \"nonpayable\",\n  },\n  {\n    type: \"function\",\n    name: \"settleWithPermit\",\n    inputs: [\n      {\n        name: \"permit2612\",\n        type: \"tuple\",\n        internalType: \"struct x402BasePermit2Proxy.EIP2612Permit\",\n        components: [\n          { name: \"value\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"deadline\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"r\", type: \"bytes32\", internalType: \"bytes32\" },\n          { name: \"s\", type: \"bytes32\", internalType: \"bytes32\" },\n          { name: \"v\", type: \"uint8\", internalType: \"uint8\" },\n        ],\n      },\n      {\n        name: \"permit\",\n        type: \"tuple\",\n        internalType: \"struct ISignatureTransfer.PermitTransferFrom\",\n        components: [\n          {\n            name: \"permitted\",\n            type: \"tuple\",\n            internalType: \"struct ISignatureTransfer.TokenPermissions\",\n            components: [\n              { name: \"token\", type: \"address\", internalType: \"address\" },\n              { name: \"amount\", type: \"uint256\", internalType: \"uint256\" },\n            ],\n          },\n          { name: \"nonce\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"deadline\", type: \"uint256\", internalType: \"uint256\" },\n        ],\n      },\n      { name: \"owner\", type: \"address\", internalType: \"address\" },\n      {\n        name: \"witness\",\n        type: \"tuple\",\n        internalType: \"struct x402BasePermit2Proxy.Witness\",\n        components: [\n          { name: \"to\", type: \"address\", internalType: \"address\" },\n          { name: \"validAfter\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"extra\", type: \"bytes\", internalType: \"bytes\" },\n        ],\n      },\n      { name: \"signature\", type: \"bytes\", internalType: \"bytes\" },\n    ],\n    outputs: [],\n    stateMutability: \"nonpayable\",\n  },\n  { type: \"event\", name: \"Settled\", inputs: [], anonymous: false },\n  { type: \"event\", name: \"SettledWithPermit\", inputs: [], anonymous: false },\n  { type: \"error\", name: \"AlreadyInitialized\", inputs: [] },\n  { type: \"error\", name: \"InvalidDestination\", inputs: [] },\n  { type: \"error\", name: \"InvalidOwner\", inputs: [] },\n  { type: \"error\", name: \"InvalidPermit2Address\", inputs: [] },\n  { type: \"error\", name: \"PaymentTooEarly\", inputs: [] },\n  { type: \"error\", name: \"ReentrancyGuardReentrantCall\", inputs: [] },\n] as const;\n","import { toHex } from \"viem\";\nimport { EVM_NETWORK_CHAIN_ID_MAP, EvmNetworkV1 } from \"./v1\";\n\n/**\n * Extract chain ID from network string (e.g., \"base-sepolia\" -> 84532)\n * Used by v1 implementations\n *\n * @param network - The network identifier\n * @returns The numeric chain ID\n * @throws Error if the network is not supported\n */\nexport function getEvmChainId(network: EvmNetworkV1): number {\n  const chainId = EVM_NETWORK_CHAIN_ID_MAP[network];\n  if (!chainId) {\n    throw new Error(`Unsupported network: ${network}`);\n  }\n  return chainId;\n}\n\n/**\n * Get the crypto object from the global scope.\n *\n * @returns The crypto object\n * @throws Error if crypto API is not available\n */\nfunction getCrypto(): Crypto {\n  const cryptoObj = globalThis.crypto as Crypto | undefined;\n  if (!cryptoObj) {\n    throw new Error(\"Crypto API not available\");\n  }\n  return cryptoObj;\n}\n\n/**\n * Create a random 32-byte nonce for EIP-3009 authorization.\n *\n * @returns A hex-encoded 32-byte nonce\n */\nexport function createNonce(): `0x${string}` {\n  return toHex(getCrypto().getRandomValues(new Uint8Array(32)));\n}\n\n/**\n * Creates a random 256-bit nonce for Permit2.\n * Permit2 uses uint256 nonces (not bytes32 like EIP-3009).\n *\n * @returns A string representation of the random nonce\n */\nexport function createPermit2Nonce(): string {\n  const randomBytes = getCrypto().getRandomValues(new Uint8Array(32));\n  return BigInt(toHex(randomBytes)).toString();\n}\n","import {\n  PaymentPayload,\n  PaymentPayloadV1,\n  PaymentRequirements,\n  SchemeNetworkFacilitator,\n  SettleResponse,\n  VerifyResponse,\n} from \"@x402/core/types\";\nimport { PaymentRequirementsV1 } from \"@x402/core/types/v1\";\nimport { getAddress, Hex, isAddressEqual, parseErc6492Signature, parseSignature } from \"viem\";\nimport { authorizationTypes, eip3009ABI } from \"../../../constants\";\nimport { FacilitatorEvmSigner } from \"../../../signer\";\nimport { ExactEvmPayloadV1 } from \"../../../types\";\nimport { getEvmChainId } from \"../../../utils\";\nimport { EvmNetworkV1 } from \"../../../v1\";\n\nexport interface ExactEvmSchemeV1Config {\n  /**\n   * If enabled, the facilitator will deploy ERC-4337 smart wallets\n   * via EIP-6492 when encountering undeployed contract signatures.\n   *\n   * @default false\n   */\n  deployERC4337WithEIP6492?: boolean;\n}\n\n/**\n * EVM facilitator implementation for the Exact payment scheme (V1).\n */\nexport class ExactEvmSchemeV1 implements SchemeNetworkFacilitator {\n  readonly scheme = \"exact\";\n  readonly caipFamily = \"eip155:*\";\n  private readonly config: Required<ExactEvmSchemeV1Config>;\n\n  /**\n   * Creates a new ExactEvmFacilitatorV1 instance.\n   *\n   * @param signer - The EVM signer for facilitator operations\n   * @param config - Optional configuration for the facilitator\n   */\n  constructor(\n    private readonly signer: FacilitatorEvmSigner,\n    config?: ExactEvmSchemeV1Config,\n  ) {\n    this.config = {\n      deployERC4337WithEIP6492: config?.deployERC4337WithEIP6492 ?? false,\n    };\n  }\n\n  /**\n   * Get mechanism-specific extra data for the supported kinds endpoint.\n   * For EVM, no extra data is needed.\n   *\n   * @param _ - The network identifier (unused for EVM)\n   * @returns undefined (EVM has no extra data)\n   */\n  getExtra(_: string): Record<string, unknown> | undefined {\n    return undefined;\n  }\n\n  /**\n   * Get signer addresses used by this facilitator.\n   * Returns all addresses this facilitator can use for signing/settling transactions.\n   *\n   * @param _ - The network identifier (unused for EVM, addresses are network-agnostic)\n   * @returns Array of facilitator wallet addresses\n   */\n  getSigners(_: string): string[] {\n    return [...this.signer.getAddresses()];\n  }\n\n  /**\n   * Verifies a payment payload (V1).\n   *\n   * @param payload - The payment payload to verify\n   * @param requirements - The payment requirements\n   * @returns Promise resolving to verification response\n   */\n  async verify(\n    payload: PaymentPayload,\n    requirements: PaymentRequirements,\n  ): Promise<VerifyResponse> {\n    const requirementsV1 = requirements as unknown as PaymentRequirementsV1;\n    const payloadV1 = payload as unknown as PaymentPayloadV1;\n    const exactEvmPayload = payload.payload as ExactEvmPayloadV1;\n\n    // Verify scheme matches\n    if (payloadV1.scheme !== \"exact\" || requirements.scheme !== \"exact\") {\n      return {\n        isValid: false,\n        invalidReason: \"unsupported_scheme\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    // Get chain configuration\n    let chainId: number;\n    try {\n      chainId = getEvmChainId(payloadV1.network as EvmNetworkV1);\n    } catch {\n      return {\n        isValid: false,\n        invalidReason: `invalid_network`,\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    if (!requirements.extra?.name || !requirements.extra?.version) {\n      return {\n        isValid: false,\n        invalidReason: \"missing_eip712_domain\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    const { name, version } = requirements.extra;\n    const erc20Address = getAddress(requirements.asset);\n\n    // Verify network matches\n    if (payloadV1.network !== requirements.network) {\n      return {\n        isValid: false,\n        invalidReason: \"network_mismatch\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    // Build typed data for signature verification\n    const permitTypedData = {\n      types: authorizationTypes,\n      primaryType: \"TransferWithAuthorization\" as const,\n      domain: {\n        name,\n        version,\n        chainId,\n        verifyingContract: erc20Address,\n      },\n      message: {\n        from: exactEvmPayload.authorization.from,\n        to: exactEvmPayload.authorization.to,\n        value: BigInt(exactEvmPayload.authorization.value),\n        validAfter: BigInt(exactEvmPayload.authorization.validAfter),\n        validBefore: BigInt(exactEvmPayload.authorization.validBefore),\n        nonce: exactEvmPayload.authorization.nonce,\n      },\n    };\n\n    // Verify signature\n    try {\n      const recoveredAddress = await this.signer.verifyTypedData({\n        address: exactEvmPayload.authorization.from,\n        ...permitTypedData,\n        signature: exactEvmPayload.signature!,\n      });\n\n      if (!recoveredAddress) {\n        return {\n          isValid: false,\n          invalidReason: \"invalid_exact_evm_payload_signature\",\n          payer: exactEvmPayload.authorization.from,\n        };\n      }\n    } catch {\n      // Signature verification failed - could be an undeployed smart wallet\n      // Check if smart wallet is deployed\n      const signature = exactEvmPayload.signature!;\n      const signatureLength = signature.startsWith(\"0x\") ? signature.length - 2 : signature.length;\n      const isSmartWallet = signatureLength > 130; // 65 bytes = 130 hex chars for EOA\n\n      if (isSmartWallet) {\n        const payerAddress = exactEvmPayload.authorization.from;\n        const bytecode = await this.signer.getCode({ address: payerAddress });\n\n        if (!bytecode || bytecode === \"0x\") {\n          // Wallet is not deployed. Check if it's EIP-6492 with deployment info.\n          // EIP-6492 signatures contain factory address and calldata needed for deployment.\n          // Non-EIP-6492 undeployed wallets cannot succeed (no way to deploy them).\n          const erc6492Data = parseErc6492Signature(signature);\n          const hasDeploymentInfo =\n            erc6492Data.address &&\n            erc6492Data.data &&\n            !isAddressEqual(erc6492Data.address, \"0x0000000000000000000000000000000000000000\");\n\n          if (!hasDeploymentInfo) {\n            // Non-EIP-6492 undeployed smart wallet - will always fail at settlement\n            // since EIP-3009 requires on-chain EIP-1271 validation\n            return {\n              isValid: false,\n              invalidReason: \"invalid_exact_evm_payload_undeployed_smart_wallet\",\n              payer: payerAddress,\n            };\n          }\n          // EIP-6492 signature with deployment info - allow through\n          // Facilitators with sponsored deployment support can handle this in settle()\n        } else {\n          // Wallet is deployed but signature still failed - invalid signature\n          return {\n            isValid: false,\n            invalidReason: \"invalid_exact_evm_payload_signature\",\n            payer: exactEvmPayload.authorization.from,\n          };\n        }\n      } else {\n        // EOA signature failed\n        return {\n          isValid: false,\n          invalidReason: \"invalid_exact_evm_payload_signature\",\n          payer: exactEvmPayload.authorization.from,\n        };\n      }\n    }\n\n    // Verify payment recipient matches\n    if (getAddress(exactEvmPayload.authorization.to) !== getAddress(requirements.payTo)) {\n      return {\n        isValid: false,\n        invalidReason: \"invalid_exact_evm_payload_recipient_mismatch\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    // Verify validBefore is in the future (with 6 second buffer for block time)\n    const now = Math.floor(Date.now() / 1000);\n    if (BigInt(exactEvmPayload.authorization.validBefore) < BigInt(now + 6)) {\n      return {\n        isValid: false,\n        invalidReason: \"invalid_exact_evm_payload_authorization_valid_before\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    // Verify validAfter is not in the future\n    if (BigInt(exactEvmPayload.authorization.validAfter) > BigInt(now)) {\n      return {\n        isValid: false,\n        invalidReason: \"invalid_exact_evm_payload_authorization_valid_after\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    // Check balance\n    try {\n      const balance = (await this.signer.readContract({\n        address: erc20Address,\n        abi: eip3009ABI,\n        functionName: \"balanceOf\",\n        args: [exactEvmPayload.authorization.from],\n      })) as bigint;\n\n      if (BigInt(balance) < BigInt(requirementsV1.maxAmountRequired)) {\n        return {\n          isValid: false,\n          invalidReason: \"insufficient_funds\",\n          invalidMessage: `Insufficient funds to complete the payment. Required: ${requirementsV1.maxAmountRequired} ${requirements.asset}, Available: ${balance.toString()} ${requirements.asset}. Please add funds to your wallet and try again.`,\n          payer: exactEvmPayload.authorization.from,\n        };\n      }\n    } catch {\n      // If we can't check balance, continue with other validations\n    }\n\n    // Verify amount is sufficient\n    if (BigInt(exactEvmPayload.authorization.value) < BigInt(requirementsV1.maxAmountRequired)) {\n      return {\n        isValid: false,\n        invalidReason: \"invalid_exact_evm_payload_authorization_value\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    return {\n      isValid: true,\n      invalidReason: undefined,\n      payer: exactEvmPayload.authorization.from,\n    };\n  }\n\n  /**\n   * Settles a payment by executing the transfer (V1).\n   *\n   * @param payload - The payment payload to settle\n   * @param requirements - The payment requirements\n   * @returns Promise resolving to settlement response\n   */\n  async settle(\n    payload: PaymentPayload,\n    requirements: PaymentRequirements,\n  ): Promise<SettleResponse> {\n    const payloadV1 = payload as unknown as PaymentPayloadV1;\n    const exactEvmPayload = payload.payload as ExactEvmPayloadV1;\n\n    // Re-verify before settling\n    const valid = await this.verify(payload, requirements);\n    if (!valid.isValid) {\n      return {\n        success: false,\n        network: payloadV1.network,\n        transaction: \"\",\n        errorReason: valid.invalidReason ?? \"invalid_scheme\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    try {\n      // Parse ERC-6492 signature if applicable\n      const parseResult = parseErc6492Signature(exactEvmPayload.signature!);\n      const { signature, address: factoryAddress, data: factoryCalldata } = parseResult;\n\n      // Deploy ERC-4337 smart wallet via EIP-6492 if configured and needed\n      if (\n        this.config.deployERC4337WithEIP6492 &&\n        factoryAddress &&\n        factoryCalldata &&\n        !isAddressEqual(factoryAddress, \"0x0000000000000000000000000000000000000000\")\n      ) {\n        // Check if smart wallet is already deployed\n        const payerAddress = exactEvmPayload.authorization.from;\n        const bytecode = await this.signer.getCode({ address: payerAddress });\n\n        if (!bytecode || bytecode === \"0x\") {\n          // Wallet not deployed - attempt deployment\n          try {\n            console.log(`Deploying ERC-4337 smart wallet for ${payerAddress} via EIP-6492`);\n\n            // Send the factory calldata directly as a transaction\n            // The factoryCalldata already contains the complete encoded function call\n            const deployTx = await this.signer.sendTransaction({\n              to: factoryAddress as Hex,\n              data: factoryCalldata as Hex,\n            });\n\n            // Wait for deployment transaction\n            await this.signer.waitForTransactionReceipt({ hash: deployTx });\n            console.log(`Successfully deployed smart wallet for ${payerAddress}`);\n          } catch (deployError) {\n            console.error(\"Smart wallet deployment failed:\", deployError);\n            // Deployment failed - cannot proceed\n            throw deployError;\n          }\n        } else {\n          console.log(`Smart wallet for ${payerAddress} already deployed, skipping deployment`);\n        }\n      }\n\n      // Determine if this is an ECDSA signature (EOA) or smart wallet signature\n      // ECDSA signatures are exactly 65 bytes (130 hex chars without 0x)\n      const signatureLength = signature.startsWith(\"0x\") ? signature.length - 2 : signature.length;\n      const isECDSA = signatureLength === 130;\n\n      let tx: Hex;\n      if (isECDSA) {\n        // For EOA wallets, parse signature into v, r, s and use that overload\n        const parsedSig = parseSignature(signature);\n\n        tx = await this.signer.writeContract({\n          address: getAddress(requirements.asset),\n          abi: eip3009ABI,\n          functionName: \"transferWithAuthorization\",\n          args: [\n            getAddress(exactEvmPayload.authorization.from),\n            getAddress(exactEvmPayload.authorization.to),\n            BigInt(exactEvmPayload.authorization.value),\n            BigInt(exactEvmPayload.authorization.validAfter),\n            BigInt(exactEvmPayload.authorization.validBefore),\n            exactEvmPayload.authorization.nonce,\n            (parsedSig.v as number | undefined) || parsedSig.yParity,\n            parsedSig.r,\n            parsedSig.s,\n          ],\n        });\n      } else {\n        // For smart wallets, use the bytes signature overload\n        // The signature contains WebAuthn/P256 or other ERC-1271 compatible signature data\n        tx = await this.signer.writeContract({\n          address: getAddress(requirements.asset),\n          abi: eip3009ABI,\n          functionName: \"transferWithAuthorization\",\n          args: [\n            getAddress(exactEvmPayload.authorization.from),\n            getAddress(exactEvmPayload.authorization.to),\n            BigInt(exactEvmPayload.authorization.value),\n            BigInt(exactEvmPayload.authorization.validAfter),\n            BigInt(exactEvmPayload.authorization.validBefore),\n            exactEvmPayload.authorization.nonce,\n            signature,\n          ],\n        });\n      }\n\n      // Wait for transaction confirmation\n      const receipt = await this.signer.waitForTransactionReceipt({ hash: tx });\n\n      if (receipt.status !== \"success\") {\n        return {\n          success: false,\n          errorReason: \"invalid_transaction_state\",\n          transaction: tx,\n          network: payloadV1.network,\n          payer: exactEvmPayload.authorization.from,\n        };\n      }\n\n      return {\n        success: true,\n        transaction: tx,\n        network: payloadV1.network,\n        payer: exactEvmPayload.authorization.from,\n      };\n    } catch (error) {\n      console.error(\"Failed to settle transaction:\", error);\n      return {\n        success: false,\n        errorReason: \"transaction_failed\",\n        transaction: \"\",\n        network: payloadV1.network,\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n  }\n}\n"],"mappings":";;;;;;;;;;;;;;;;;;;;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;;;ACOA,IAAAA,eAA2B;;;ACNpB,IAAM,qBAAqB;AAAA,EAChC,2BAA2B;AAAA,IACzB,EAAE,MAAM,QAAQ,MAAM,UAAU;AAAA,IAChC,EAAE,MAAM,MAAM,MAAM,UAAU;AAAA,IAC9B,EAAE,MAAM,SAAS,MAAM,UAAU;AAAA,IACjC,EAAE,MAAM,cAAc,MAAM,UAAU;AAAA,IACtC,EAAE,MAAM,eAAe,MAAM,UAAU;AAAA,IACvC,EAAE,MAAM,SAAS,MAAM,UAAU;AAAA,EACnC;AACF;;;ACVA,kBAAsB;AAWf,SAAS,cAAc,SAA+B;AAC3D,QAAM,UAAU,yBAAyB,OAAO;AAChD,MAAI,CAAC,SAAS;AACZ,UAAM,IAAI,MAAM,wBAAwB,OAAO,EAAE;AAAA,EACnD;AACA,SAAO;AACT;AAQA,SAAS,YAAoB;AAC3B,QAAM,YAAY,WAAW;AAC7B,MAAI,CAAC,WAAW;AACd,UAAM,IAAI,MAAM,0BAA0B;AAAA,EAC5C;AACA,SAAO;AACT;AAOO,SAAS,cAA6B;AAC3C,aAAO,mBAAM,UAAU,EAAE,gBAAgB,IAAI,WAAW,EAAE,CAAC,CAAC;AAC9D;;;AFvBO,IAAM,mBAAN,MAAsD;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA,EAQ3D,YAA6B,QAAyB;AAAzB;AAP7B,SAAS,SAAS;AAAA,EAOqC;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA,EASvD,MAAM,qBACJ,aACA,qBAGA;AACA,UAAM,aAAa;AACnB,UAAM,QAAQ,YAAY;AAC1B,UAAM,MAAM,KAAK,MAAM,KAAK,IAAI,IAAI,GAAI;AAExC,UAAM,gBAAoD;AAAA,MACxD,MAAM,KAAK,OAAO;AAAA,MAClB,QAAI,yBAAW,WAAW,KAAK;AAAA,MAC/B,OAAO,WAAW;AAAA,MAClB,aAAa,MAAM,KAAK,SAAS;AAAA;AAAA,MACjC,cAAc,MAAM,WAAW,mBAAmB,SAAS;AAAA,MAC3D;AAAA,IACF;AAGA,UAAM,YAAY,MAAM,KAAK,kBAAkB,eAAe,UAAU;AAExE,UAAM,UAA6B;AAAA,MACjC;AAAA,MACA;AAAA,IACF;AAEA,WAAO;AAAA,MACL;AAAA,MACA,QAAQ,WAAW;AAAA,MACnB,SAAS,WAAW;AAAA,MACpB;AAAA,IACF;AAAA,EACF;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA,EASA,MAAc,kBACZ,eACA,cACwB;AACxB,UAAM,UAAU,cAAc,aAAa,OAAuB;AAElE,QAAI,CAAC,aAAa,OAAO,QAAQ,CAAC,aAAa,OAAO,SAAS;AAC7D,YAAM,IAAI;AAAA,QACR,4FAA4F,aAAa,KAAK;AAAA,MAChH;AAAA,IACF;AAEA,UAAM,EAAE,MAAM,QAAQ,IAAI,aAAa;AAEvC,UAAM,SAAS;AAAA,MACb;AAAA,MACA;AAAA,MACA;AAAA,MACA,uBAAmB,yBAAW,aAAa,KAAK;AAAA,IAClD;AAEA,UAAM,UAAU;AAAA,MACd,UAAM,yBAAW,cAAc,IAAI;AAAA,MACnC,QAAI,yBAAW,cAAc,EAAE;AAAA,MAC/B,OAAO,OAAO,cAAc,KAAK;AAAA,MACjC,YAAY,OAAO,cAAc,UAAU;AAAA,MAC3C,aAAa,OAAO,cAAc,WAAW;AAAA,MAC7C,OAAO,cAAc;AAAA,IACvB;AAEA,WAAO,MAAM,KAAK,OAAO,cAAc;AAAA,MACrC;AAAA,MACA,OAAO;AAAA,MACP,aAAa;AAAA,MACb;AAAA,IACF,CAAC;AAAA,EACH;AACF;;;AGxGA,IAAAC,eAAuF;;;AJPhF,IAAM,2BAA2B;AAAA,EACtC,UAAU;AAAA,EACV,SAAS;AAAA,EACT,UAAU;AAAA,EACV,oBAAoB;AAAA,EACpB,gBAAgB;AAAA,EAChB,MAAM;AAAA,EACN,kBAAkB;AAAA,EAClB,WAAW;AAAA,EACX,OAAO;AAAA,EACP,KAAK;AAAA,EACL,eAAe;AAAA,EACf,SAAS;AAAA,EACT,gBAAgB;AAAA,EAChB,MAAM;AAAA,EACN,OAAO;AAAA,EACP,UAAU;AAAA,EACV,sBAAsB;AAAA,EACtB,SAAS;AACX;AAIO,IAAM,WAAqB,OAAO,KAAK,wBAAwB;","names":["import_viem","import_viem"]}

dist/esm/exact/client/index.d.mts

@@ -1,5 +0,5 @@
-export { E as ExactEvmScheme, P as Permit2AllowanceParams, c as createPermit2ApprovalTx, e as erc20AllowanceAbi, g as getPermit2AllowanceReadParams } from '../../permit2-BsAoJiWD.mjs';
+export { E as ExactEvmScheme, P as Permit2AllowanceParams, c as createPermit2ApprovalTx, e as erc20AllowanceAbi, g as getPermit2AllowanceReadParams } from '../../permit2-C2FkNEHT.mjs';
 import { SelectPaymentRequirements, PaymentPolicy, x402Client } from '@x402/core/client';
 import { Network } from '@x402/core/types';
-import { C as ClientEvmSigner } from '../../signer-5OVDxViv.mjs';
+import { C as ClientEvmSigner } from '../../signer-3KGwtdNT.mjs';
 
@@ -6,0 +6,0 @@ /**

dist/esm/exact/client/index.mjs

@@ -7,4 +7,4 @@ import {
   registerExactEvmScheme
-} from "../../chunk-E2YMUI3X.mjs";
-import "../../chunk-RPL6OFJL.mjs";
+} from "../../chunk-CJHYX7BQ.mjs";
+import "../../chunk-GSU4DHTC.mjs";
 export {
@@ -11,0 +11,0 @@ ExactEvmScheme,

dist/esm/exact/facilitator/index.d.mts

 import { SchemeNetworkFacilitator, PaymentPayload, PaymentRequirements, VerifyResponse, SettleResponse, Network } from '@x402/core/types';
-import { F as FacilitatorEvmSigner } from '../../signer-5OVDxViv.mjs';
+import { F as FacilitatorEvmSigner } from '../../signer-3KGwtdNT.mjs';
 import { x402Facilitator } from '@x402/core/facilitator';
@@ -4,0 +4,0 @@

dist/esm/exact/facilitator/index.mjs

@@ -13,3 +13,3 @@ import {
   x402ExactPermit2ProxyAddress
-} from "../../chunk-RPL6OFJL.mjs";
+} from "../../chunk-GSU4DHTC.mjs";
 
@@ -248,2 +248,6 @@ // src/exact/facilitator/eip3009.ts
 // src/exact/facilitator/permit2.ts
+import {
+  extractEip2612GasSponsoringInfo,
+  validateEip2612GasSponsoringInfo
+} from "@x402/extensions";
 import { getAddress as getAddress2 } from "viem";
@@ -374,9 +378,32 @@ var erc20AllowanceABI = [
     if (allowance < BigInt(requirements.amount)) {
-      return {
-        isValid: false,
-        invalidReason: "permit2_allowance_required",
-        payer
-      };
+      const eip2612Info = extractEip2612GasSponsoringInfo(payload);
+      if (eip2612Info) {
+        const validationResult = validateEip2612PermitForPayment(eip2612Info, payer, tokenAddress);
+        if (!validationResult.isValid) {
+          return {
+            isValid: false,
+            invalidReason: validationResult.invalidReason,
+            payer
+          };
+        }
+      } else {
+        return {
+          isValid: false,
+          invalidReason: "permit2_allowance_required",
+          payer
+        };
+      }
     }
   } catch {
+    const eip2612Info = extractEip2612GasSponsoringInfo(payload);
+    if (eip2612Info) {
+      const validationResult = validateEip2612PermitForPayment(eip2612Info, payer, tokenAddress);
+      if (!validationResult.isValid) {
+        return {
+          isValid: false,
+          invalidReason: validationResult.invalidReason,
+          payer
+        };
+      }
+    }
   }
@@ -419,24 +446,59 @@ try {
   try {
-    const tx = await signer.writeContract({
-      address: x402ExactPermit2ProxyAddress,
-      abi: x402ExactPermit2ProxyABI,
-      functionName: "settle",
-      args: [
-        {
-          permitted: {
-            token: getAddress2(permit2Payload.permit2Authorization.permitted.token),
-            amount: BigInt(permit2Payload.permit2Authorization.permitted.amount)
+    const eip2612Info = extractEip2612GasSponsoringInfo(payload);
+    let tx;
+    if (eip2612Info) {
+      const { v, r, s } = splitEip2612Signature(eip2612Info.signature);
+      tx = await signer.writeContract({
+        address: x402ExactPermit2ProxyAddress,
+        abi: x402ExactPermit2ProxyABI,
+        functionName: "settleWithPermit",
+        args: [
+          {
+            value: BigInt(eip2612Info.amount),
+            deadline: BigInt(eip2612Info.deadline),
+            r,
+            s,
+            v
           },
-          nonce: BigInt(permit2Payload.permit2Authorization.nonce),
-          deadline: BigInt(permit2Payload.permit2Authorization.deadline)
-        },
-        getAddress2(payer),
-        {
-          to: getAddress2(permit2Payload.permit2Authorization.witness.to),
-          validAfter: BigInt(permit2Payload.permit2Authorization.witness.validAfter),
-          extra: permit2Payload.permit2Authorization.witness.extra
-        },
-        permit2Payload.signature
-      ]
-    });
+          {
+            permitted: {
+              token: getAddress2(permit2Payload.permit2Authorization.permitted.token),
+              amount: BigInt(permit2Payload.permit2Authorization.permitted.amount)
+            },
+            nonce: BigInt(permit2Payload.permit2Authorization.nonce),
+            deadline: BigInt(permit2Payload.permit2Authorization.deadline)
+          },
+          getAddress2(payer),
+          {
+            to: getAddress2(permit2Payload.permit2Authorization.witness.to),
+            validAfter: BigInt(permit2Payload.permit2Authorization.witness.validAfter),
+            extra: permit2Payload.permit2Authorization.witness.extra
+          },
+          permit2Payload.signature
+        ]
+      });
+    } else {
+      tx = await signer.writeContract({
+        address: x402ExactPermit2ProxyAddress,
+        abi: x402ExactPermit2ProxyABI,
+        functionName: "settle",
+        args: [
+          {
+            permitted: {
+              token: getAddress2(permit2Payload.permit2Authorization.permitted.token),
+              amount: BigInt(permit2Payload.permit2Authorization.permitted.amount)
+            },
+            nonce: BigInt(permit2Payload.permit2Authorization.nonce),
+            deadline: BigInt(permit2Payload.permit2Authorization.deadline)
+          },
+          getAddress2(payer),
+          {
+            to: getAddress2(permit2Payload.permit2Authorization.witness.to),
+            validAfter: BigInt(permit2Payload.permit2Authorization.witness.validAfter),
+            extra: permit2Payload.permit2Authorization.witness.extra
+          },
+          permit2Payload.signature
+        ]
+      });
+    }
     const receipt = await signer.waitForTransactionReceipt({ hash: tx });
@@ -487,2 +549,33 @@ if (receipt.status !== "success") {
 }
+function validateEip2612PermitForPayment(info, payer, tokenAddress) {
+  if (!validateEip2612GasSponsoringInfo(info)) {
+    return { isValid: false, invalidReason: "invalid_eip2612_extension_format" };
+  }
+  if (getAddress2(info.from) !== getAddress2(payer)) {
+    return { isValid: false, invalidReason: "eip2612_from_mismatch" };
+  }
+  if (getAddress2(info.asset) !== tokenAddress) {
+    return { isValid: false, invalidReason: "eip2612_asset_mismatch" };
+  }
+  if (getAddress2(info.spender) !== getAddress2(PERMIT2_ADDRESS)) {
+    return { isValid: false, invalidReason: "eip2612_spender_not_permit2" };
+  }
+  const now = Math.floor(Date.now() / 1e3);
+  if (BigInt(info.deadline) < BigInt(now + 6)) {
+    return { isValid: false, invalidReason: "eip2612_deadline_expired" };
+  }
+  return { isValid: true };
+}
+function splitEip2612Signature(signature) {
+  const sig = signature.startsWith("0x") ? signature.slice(2) : signature;
+  if (sig.length !== 130) {
+    throw new Error(
+      `invalid EIP-2612 signature length: expected 65 bytes (130 hex chars), got ${sig.length / 2} bytes`
+    );
+  }
+  const r = `0x${sig.slice(0, 64)}`;
+  const s = `0x${sig.slice(64, 128)}`;
+  const v = parseInt(sig.slice(128, 130), 16);
+  return { v, r, s };
+}
 
@@ -489,0 +582,0 @@ // src/exact/facilitator/scheme.ts

dist/esm/exact/facilitator/index.mjs.map

@@ -1,1 +0,1 @@
-{"version":3,"sources":["../../../../src/exact/facilitator/eip3009.ts","../../../../src/exact/facilitator/permit2.ts","../../../../src/exact/facilitator/scheme.ts","../../../../src/exact/facilitator/register.ts"],"sourcesContent":["import {\n  PaymentPayload,\n  PaymentRequirements,\n  SettleResponse,\n  VerifyResponse,\n} from \"@x402/core/types\";\nimport { getAddress, Hex, isAddressEqual, parseErc6492Signature, parseSignature } from \"viem\";\nimport { authorizationTypes, eip3009ABI } from \"../../constants\";\nimport { FacilitatorEvmSigner } from \"../../signer\";\nimport { ExactEIP3009Payload } from \"../../types\";\n\nexport interface EIP3009FacilitatorConfig {\n  /**\n   * If enabled, the facilitator will deploy ERC-4337 smart wallets\n   * via EIP-6492 when encountering undeployed contract signatures.\n   *\n   * @default false\n   */\n  deployERC4337WithEIP6492: boolean;\n}\n\n/**\n * Verifies an EIP-3009 payment payload.\n *\n * @param signer - The facilitator signer for contract reads\n * @param payload - The payment payload to verify\n * @param requirements - The payment requirements\n * @param eip3009Payload - The EIP-3009 specific payload\n * @returns Promise resolving to verification response\n */\nexport async function verifyEIP3009(\n  signer: FacilitatorEvmSigner,\n  payload: PaymentPayload,\n  requirements: PaymentRequirements,\n  eip3009Payload: ExactEIP3009Payload,\n): Promise<VerifyResponse> {\n  const payer = eip3009Payload.authorization.from;\n\n  // Verify scheme matches\n  if (payload.accepted.scheme !== \"exact\" || requirements.scheme !== \"exact\") {\n    return {\n      isValid: false,\n      invalidReason: \"unsupported_scheme\",\n      payer,\n    };\n  }\n\n  // Get chain configuration\n  if (!requirements.extra?.name || !requirements.extra?.version) {\n    return {\n      isValid: false,\n      invalidReason: \"missing_eip712_domain\",\n      payer,\n    };\n  }\n\n  const { name, version } = requirements.extra;\n  const erc20Address = getAddress(requirements.asset);\n\n  // Verify network matches\n  if (payload.accepted.network !== requirements.network) {\n    return {\n      isValid: false,\n      invalidReason: \"network_mismatch\",\n      payer,\n    };\n  }\n\n  // Build typed data for signature verification\n  const permitTypedData = {\n    types: authorizationTypes,\n    primaryType: \"TransferWithAuthorization\" as const,\n    domain: {\n      name,\n      version,\n      chainId: parseInt(requirements.network.split(\":\")[1]),\n      verifyingContract: erc20Address,\n    },\n    message: {\n      from: eip3009Payload.authorization.from,\n      to: eip3009Payload.authorization.to,\n      value: BigInt(eip3009Payload.authorization.value),\n      validAfter: BigInt(eip3009Payload.authorization.validAfter),\n      validBefore: BigInt(eip3009Payload.authorization.validBefore),\n      nonce: eip3009Payload.authorization.nonce,\n    },\n  };\n\n  // Verify signature\n  try {\n    const recoveredAddress = await signer.verifyTypedData({\n      address: eip3009Payload.authorization.from,\n      ...permitTypedData,\n      signature: eip3009Payload.signature!,\n    });\n\n    if (!recoveredAddress) {\n      return {\n        isValid: false,\n        invalidReason: \"invalid_exact_evm_payload_signature\",\n        payer,\n      };\n    }\n  } catch {\n    // Signature verification failed - could be an undeployed smart wallet\n    // Check if smart wallet is deployed\n    const signature = eip3009Payload.signature!;\n    const signatureLength = signature.startsWith(\"0x\") ? signature.length - 2 : signature.length;\n    const isSmartWallet = signatureLength > 130; // 65 bytes = 130 hex chars for EOA\n\n    if (isSmartWallet) {\n      const payerAddress = eip3009Payload.authorization.from;\n      const bytecode = await signer.getCode({ address: payerAddress });\n\n      if (!bytecode || bytecode === \"0x\") {\n        // Wallet is not deployed. Check if it's EIP-6492 with deployment info.\n        const erc6492Data = parseErc6492Signature(signature);\n        const hasDeploymentInfo =\n          erc6492Data.address &&\n          erc6492Data.data &&\n          !isAddressEqual(erc6492Data.address, \"0x0000000000000000000000000000000000000000\");\n\n        if (!hasDeploymentInfo) {\n          // Non-EIP-6492 undeployed smart wallet - will always fail at settlement\n          return {\n            isValid: false,\n            invalidReason: \"invalid_exact_evm_payload_undeployed_smart_wallet\",\n            payer: payerAddress,\n          };\n        }\n        // EIP-6492 signature with deployment info - allow through\n      } else {\n        // Wallet is deployed but signature still failed - invalid signature\n        return {\n          isValid: false,\n          invalidReason: \"invalid_exact_evm_payload_signature\",\n          payer,\n        };\n      }\n    } else {\n      // EOA signature failed\n      return {\n        isValid: false,\n        invalidReason: \"invalid_exact_evm_payload_signature\",\n        payer,\n      };\n    }\n  }\n\n  // Verify payment recipient matches\n  if (getAddress(eip3009Payload.authorization.to) !== getAddress(requirements.payTo)) {\n    return {\n      isValid: false,\n      invalidReason: \"invalid_exact_evm_payload_recipient_mismatch\",\n      payer,\n    };\n  }\n\n  // Verify validBefore is in the future (with 6 second buffer for block time)\n  const now = Math.floor(Date.now() / 1000);\n  if (BigInt(eip3009Payload.authorization.validBefore) < BigInt(now + 6)) {\n    return {\n      isValid: false,\n      invalidReason: \"invalid_exact_evm_payload_authorization_valid_before\",\n      payer,\n    };\n  }\n\n  // Verify validAfter is not in the future\n  if (BigInt(eip3009Payload.authorization.validAfter) > BigInt(now)) {\n    return {\n      isValid: false,\n      invalidReason: \"invalid_exact_evm_payload_authorization_valid_after\",\n      payer,\n    };\n  }\n\n  // Check balance\n  try {\n    const balance = (await signer.readContract({\n      address: erc20Address,\n      abi: eip3009ABI,\n      functionName: \"balanceOf\",\n      args: [eip3009Payload.authorization.from],\n    })) as bigint;\n\n    if (BigInt(balance) < BigInt(requirements.amount)) {\n      return {\n        isValid: false,\n        invalidReason: \"insufficient_funds\",\n        invalidMessage: `Insufficient funds to complete the payment. Required: ${requirements.amount} ${requirements.asset}, Available: ${balance.toString()} ${requirements.asset}. Please add funds to your wallet and try again.`,\n        payer,\n      };\n    }\n  } catch {\n    // If we can't check balance, continue with other validations\n  }\n\n  // Verify amount is sufficient\n  if (BigInt(eip3009Payload.authorization.value) < BigInt(requirements.amount)) {\n    return {\n      isValid: false,\n      invalidReason: \"invalid_exact_evm_payload_authorization_value\",\n      payer,\n    };\n  }\n\n  return {\n    isValid: true,\n    invalidReason: undefined,\n    payer,\n  };\n}\n\n/**\n * Settles an EIP-3009 payment by executing transferWithAuthorization.\n *\n * @param signer - The facilitator signer for contract writes\n * @param payload - The payment payload to settle\n * @param requirements - The payment requirements\n * @param eip3009Payload - The EIP-3009 specific payload\n * @param config - Facilitator configuration\n * @returns Promise resolving to settlement response\n */\nexport async function settleEIP3009(\n  signer: FacilitatorEvmSigner,\n  payload: PaymentPayload,\n  requirements: PaymentRequirements,\n  eip3009Payload: ExactEIP3009Payload,\n  config: EIP3009FacilitatorConfig,\n): Promise<SettleResponse> {\n  const payer = eip3009Payload.authorization.from;\n\n  // Re-verify before settling\n  const valid = await verifyEIP3009(signer, payload, requirements, eip3009Payload);\n  if (!valid.isValid) {\n    return {\n      success: false,\n      network: payload.accepted.network,\n      transaction: \"\",\n      errorReason: valid.invalidReason ?? \"invalid_scheme\",\n      payer,\n    };\n  }\n\n  try {\n    // Parse ERC-6492 signature if applicable\n    const parseResult = parseErc6492Signature(eip3009Payload.signature!);\n    const { signature, address: factoryAddress, data: factoryCalldata } = parseResult;\n\n    // Deploy ERC-4337 smart wallet via EIP-6492 if configured and needed\n    if (\n      config.deployERC4337WithEIP6492 &&\n      factoryAddress &&\n      factoryCalldata &&\n      !isAddressEqual(factoryAddress, \"0x0000000000000000000000000000000000000000\")\n    ) {\n      // Check if smart wallet is already deployed\n      const bytecode = await signer.getCode({ address: payer });\n\n      if (!bytecode || bytecode === \"0x\") {\n        // Wallet not deployed - attempt deployment\n        const deployTx = await signer.sendTransaction({\n          to: factoryAddress as Hex,\n          data: factoryCalldata as Hex,\n        });\n\n        // Wait for deployment transaction\n        await signer.waitForTransactionReceipt({ hash: deployTx });\n      }\n    }\n\n    // Determine if this is an ECDSA signature (EOA) or smart wallet signature\n    const signatureLength = signature.startsWith(\"0x\") ? signature.length - 2 : signature.length;\n    const isECDSA = signatureLength === 130;\n\n    let tx: Hex;\n    if (isECDSA) {\n      // For EOA wallets, parse signature into v, r, s and use that overload\n      const parsedSig = parseSignature(signature);\n\n      tx = await signer.writeContract({\n        address: getAddress(requirements.asset),\n        abi: eip3009ABI,\n        functionName: \"transferWithAuthorization\",\n        args: [\n          getAddress(eip3009Payload.authorization.from),\n          getAddress(eip3009Payload.authorization.to),\n          BigInt(eip3009Payload.authorization.value),\n          BigInt(eip3009Payload.authorization.validAfter),\n          BigInt(eip3009Payload.authorization.validBefore),\n          eip3009Payload.authorization.nonce,\n          (parsedSig.v as number | undefined) || parsedSig.yParity,\n          parsedSig.r,\n          parsedSig.s,\n        ],\n      });\n    } else {\n      // For smart wallets, use the bytes signature overload\n      tx = await signer.writeContract({\n        address: getAddress(requirements.asset),\n        abi: eip3009ABI,\n        functionName: \"transferWithAuthorization\",\n        args: [\n          getAddress(eip3009Payload.authorization.from),\n          getAddress(eip3009Payload.authorization.to),\n          BigInt(eip3009Payload.authorization.value),\n          BigInt(eip3009Payload.authorization.validAfter),\n          BigInt(eip3009Payload.authorization.validBefore),\n          eip3009Payload.authorization.nonce,\n          signature,\n        ],\n      });\n    }\n\n    // Wait for transaction confirmation\n    const receipt = await signer.waitForTransactionReceipt({ hash: tx });\n\n    if (receipt.status !== \"success\") {\n      return {\n        success: false,\n        errorReason: \"invalid_transaction_state\",\n        transaction: tx,\n        network: payload.accepted.network,\n        payer,\n      };\n    }\n\n    return {\n      success: true,\n      transaction: tx,\n      network: payload.accepted.network,\n      payer,\n    };\n  } catch {\n    return {\n      success: false,\n      errorReason: \"transaction_failed\",\n      transaction: \"\",\n      network: payload.accepted.network,\n      payer,\n    };\n  }\n}\n","import {\n  PaymentPayload,\n  PaymentRequirements,\n  SettleResponse,\n  VerifyResponse,\n} from \"@x402/core/types\";\nimport { getAddress } from \"viem\";\nimport {\n  eip3009ABI,\n  PERMIT2_ADDRESS,\n  permit2WitnessTypes,\n  x402ExactPermit2ProxyABI,\n  x402ExactPermit2ProxyAddress,\n} from \"../../constants\";\nimport { FacilitatorEvmSigner } from \"../../signer\";\nimport { ExactPermit2Payload } from \"../../types\";\n\n// ERC20 allowance ABI for checking Permit2 approval\nconst erc20AllowanceABI = [\n  {\n    type: \"function\",\n    name: \"allowance\",\n    inputs: [\n      { name: \"owner\", type: \"address\" },\n      { name: \"spender\", type: \"address\" },\n    ],\n    outputs: [{ type: \"uint256\" }],\n    stateMutability: \"view\",\n  },\n] as const;\n\n/**\n * Verifies a Permit2 payment payload.\n *\n * @param signer - The facilitator signer for contract reads\n * @param payload - The payment payload to verify\n * @param requirements - The payment requirements\n * @param permit2Payload - The Permit2 specific payload\n * @returns Promise resolving to verification response\n */\nexport async function verifyPermit2(\n  signer: FacilitatorEvmSigner,\n  payload: PaymentPayload,\n  requirements: PaymentRequirements,\n  permit2Payload: ExactPermit2Payload,\n): Promise<VerifyResponse> {\n  const payer = permit2Payload.permit2Authorization.from;\n\n  // Verify scheme matches\n  if (payload.accepted.scheme !== \"exact\" || requirements.scheme !== \"exact\") {\n    return {\n      isValid: false,\n      invalidReason: \"unsupported_scheme\",\n      payer,\n    };\n  }\n\n  // Verify network matches\n  if (payload.accepted.network !== requirements.network) {\n    return {\n      isValid: false,\n      invalidReason: \"network_mismatch\",\n      payer,\n    };\n  }\n\n  const chainId = parseInt(requirements.network.split(\":\")[1]);\n  const tokenAddress = getAddress(requirements.asset);\n\n  // Verify spender is the x402ExactPermit2Proxy\n  if (\n    getAddress(permit2Payload.permit2Authorization.spender) !==\n    getAddress(x402ExactPermit2ProxyAddress)\n  ) {\n    return {\n      isValid: false,\n      invalidReason: \"invalid_permit2_spender\",\n      payer,\n    };\n  }\n\n  // Verify witness.to matches payTo\n  if (\n    getAddress(permit2Payload.permit2Authorization.witness.to) !== getAddress(requirements.payTo)\n  ) {\n    return {\n      isValid: false,\n      invalidReason: \"invalid_permit2_recipient_mismatch\",\n      payer,\n    };\n  }\n\n  // Verify deadline not expired (with 6 second buffer for block time)\n  const now = Math.floor(Date.now() / 1000);\n  if (BigInt(permit2Payload.permit2Authorization.deadline) < BigInt(now + 6)) {\n    return {\n      isValid: false,\n      invalidReason: \"permit2_deadline_expired\",\n      payer,\n    };\n  }\n\n  // Verify validAfter is not in the future\n  if (BigInt(permit2Payload.permit2Authorization.witness.validAfter) > BigInt(now)) {\n    return {\n      isValid: false,\n      invalidReason: \"permit2_not_yet_valid\",\n      payer,\n    };\n  }\n\n  // Verify amount is sufficient\n  if (BigInt(permit2Payload.permit2Authorization.permitted.amount) < BigInt(requirements.amount)) {\n    return {\n      isValid: false,\n      invalidReason: \"permit2_insufficient_amount\",\n      payer,\n    };\n  }\n\n  // Verify token matches\n  if (getAddress(permit2Payload.permit2Authorization.permitted.token) !== tokenAddress) {\n    return {\n      isValid: false,\n      invalidReason: \"permit2_token_mismatch\",\n      payer,\n    };\n  }\n\n  // Build typed data for Permit2 signature verification\n  const permit2TypedData = {\n    types: permit2WitnessTypes,\n    primaryType: \"PermitWitnessTransferFrom\" as const,\n    domain: {\n      name: \"Permit2\",\n      chainId,\n      verifyingContract: PERMIT2_ADDRESS,\n    },\n    message: {\n      permitted: {\n        token: getAddress(permit2Payload.permit2Authorization.permitted.token),\n        amount: BigInt(permit2Payload.permit2Authorization.permitted.amount),\n      },\n      spender: getAddress(permit2Payload.permit2Authorization.spender),\n      nonce: BigInt(permit2Payload.permit2Authorization.nonce),\n      deadline: BigInt(permit2Payload.permit2Authorization.deadline),\n      witness: {\n        to: getAddress(permit2Payload.permit2Authorization.witness.to),\n        validAfter: BigInt(permit2Payload.permit2Authorization.witness.validAfter),\n        extra: permit2Payload.permit2Authorization.witness.extra,\n      },\n    },\n  };\n\n  // Verify signature\n  try {\n    const isValid = await signer.verifyTypedData({\n      address: payer,\n      ...permit2TypedData,\n      signature: permit2Payload.signature,\n    });\n\n    if (!isValid) {\n      return {\n        isValid: false,\n        invalidReason: \"invalid_permit2_signature\",\n        payer,\n      };\n    }\n  } catch {\n    return {\n      isValid: false,\n      invalidReason: \"invalid_permit2_signature\",\n      payer,\n    };\n  }\n\n  // Check Permit2 allowance\n  try {\n    const allowance = (await signer.readContract({\n      address: tokenAddress,\n      abi: erc20AllowanceABI,\n      functionName: \"allowance\",\n      args: [payer, PERMIT2_ADDRESS],\n    })) as bigint;\n\n    if (allowance < BigInt(requirements.amount)) {\n      return {\n        isValid: false,\n        invalidReason: \"permit2_allowance_required\",\n        payer,\n      };\n    }\n  } catch {\n    // If we can't check allowance, continue - settlement will fail if insufficient\n  }\n\n  // Check balance\n  try {\n    const balance = (await signer.readContract({\n      address: tokenAddress,\n      abi: eip3009ABI,\n      functionName: \"balanceOf\",\n      args: [payer],\n    })) as bigint;\n\n    if (balance < BigInt(requirements.amount)) {\n      return {\n        isValid: false,\n        invalidReason: \"insufficient_funds\",\n        invalidMessage: `Insufficient funds to complete the payment. Required: ${requirements.amount} ${requirements.asset}, Available: ${balance.toString()} ${requirements.asset}. Please add funds to your wallet and try again.`,\n        payer,\n      };\n    }\n  } catch {\n    // If we can't check balance, continue with other validations\n  }\n\n  return {\n    isValid: true,\n    invalidReason: undefined,\n    payer,\n  };\n}\n\n/**\n * Settles a Permit2 payment by calling the x402ExactPermit2Proxy.\n *\n * @param signer - The facilitator signer for contract writes\n * @param payload - The payment payload to settle\n * @param requirements - The payment requirements\n * @param permit2Payload - The Permit2 specific payload\n * @returns Promise resolving to settlement response\n */\nexport async function settlePermit2(\n  signer: FacilitatorEvmSigner,\n  payload: PaymentPayload,\n  requirements: PaymentRequirements,\n  permit2Payload: ExactPermit2Payload,\n): Promise<SettleResponse> {\n  const payer = permit2Payload.permit2Authorization.from;\n\n  // Re-verify before settling\n  const valid = await verifyPermit2(signer, payload, requirements, permit2Payload);\n  if (!valid.isValid) {\n    return {\n      success: false,\n      network: payload.accepted.network,\n      transaction: \"\",\n      errorReason: valid.invalidReason ?? \"invalid_scheme\",\n      payer,\n    };\n  }\n\n  try {\n    // Call x402ExactPermit2Proxy.settle()\n    const tx = await signer.writeContract({\n      address: x402ExactPermit2ProxyAddress,\n      abi: x402ExactPermit2ProxyABI,\n      functionName: \"settle\",\n      args: [\n        {\n          permitted: {\n            token: getAddress(permit2Payload.permit2Authorization.permitted.token),\n            amount: BigInt(permit2Payload.permit2Authorization.permitted.amount),\n          },\n          nonce: BigInt(permit2Payload.permit2Authorization.nonce),\n          deadline: BigInt(permit2Payload.permit2Authorization.deadline),\n        },\n        getAddress(payer),\n        {\n          to: getAddress(permit2Payload.permit2Authorization.witness.to),\n          validAfter: BigInt(permit2Payload.permit2Authorization.witness.validAfter),\n          extra: permit2Payload.permit2Authorization.witness.extra as `0x${string}`,\n        },\n        permit2Payload.signature,\n      ],\n    });\n\n    // Wait for transaction confirmation\n    const receipt = await signer.waitForTransactionReceipt({ hash: tx });\n\n    if (receipt.status !== \"success\") {\n      return {\n        success: false,\n        errorReason: \"invalid_transaction_state\",\n        transaction: tx,\n        network: payload.accepted.network,\n        payer,\n      };\n    }\n\n    return {\n      success: true,\n      transaction: tx,\n      network: payload.accepted.network,\n      payer,\n    };\n  } catch (error) {\n    // Extract meaningful error message from the contract revert\n    let errorReason = \"transaction_failed\";\n    if (error instanceof Error) {\n      // Check for common contract revert patterns\n      const message = error.message;\n      if (message.includes(\"AmountExceedsPermitted\")) {\n        errorReason = \"permit2_amount_exceeds_permitted\";\n      } else if (message.includes(\"InvalidDestination\")) {\n        errorReason = \"permit2_invalid_destination\";\n      } else if (message.includes(\"InvalidOwner\")) {\n        errorReason = \"permit2_invalid_owner\";\n      } else if (message.includes(\"PaymentTooEarly\")) {\n        errorReason = \"permit2_payment_too_early\";\n      } else if (message.includes(\"InvalidSignature\") || message.includes(\"SignatureExpired\")) {\n        errorReason = \"permit2_invalid_signature\";\n      } else if (message.includes(\"InvalidNonce\")) {\n        errorReason = \"permit2_invalid_nonce\";\n      } else {\n        // Include error message for debugging (longer for better visibility)\n        errorReason = `transaction_failed: ${message.slice(0, 500)}`;\n      }\n    }\n    return {\n      success: false,\n      errorReason,\n      transaction: \"\",\n      network: payload.accepted.network,\n      payer,\n    };\n  }\n}\n","import {\n  PaymentPayload,\n  PaymentRequirements,\n  SchemeNetworkFacilitator,\n  SettleResponse,\n  VerifyResponse,\n} from \"@x402/core/types\";\nimport { FacilitatorEvmSigner } from \"../../signer\";\nimport { ExactEvmPayloadV2, ExactEIP3009Payload, isPermit2Payload } from \"../../types\";\nimport { verifyEIP3009, settleEIP3009 } from \"./eip3009\";\nimport { verifyPermit2, settlePermit2 } from \"./permit2\";\n\nexport interface ExactEvmSchemeConfig {\n  /**\n   * If enabled, the facilitator will deploy ERC-4337 smart wallets\n   * via EIP-6492 when encountering undeployed contract signatures.\n   *\n   * @default false\n   */\n  deployERC4337WithEIP6492?: boolean;\n}\n\n/**\n * EVM facilitator implementation for the Exact payment scheme.\n * Routes between EIP-3009 and Permit2 based on payload type.\n */\nexport class ExactEvmScheme implements SchemeNetworkFacilitator {\n  readonly scheme = \"exact\";\n  readonly caipFamily = \"eip155:*\";\n  private readonly config: Required<ExactEvmSchemeConfig>;\n\n  /**\n   * Creates a new ExactEvmFacilitator instance.\n   *\n   * @param signer - The EVM signer for facilitator operations\n   * @param config - Optional configuration for the facilitator\n   */\n  constructor(\n    private readonly signer: FacilitatorEvmSigner,\n    config?: ExactEvmSchemeConfig,\n  ) {\n    this.config = {\n      deployERC4337WithEIP6492: config?.deployERC4337WithEIP6492 ?? false,\n    };\n  }\n\n  /**\n   * Get mechanism-specific extra data for the supported kinds endpoint.\n   * For EVM, no extra data is needed.\n   *\n   * @param _ - The network identifier (unused for EVM)\n   * @returns undefined (EVM has no extra data)\n   */\n  getExtra(_: string): Record<string, unknown> | undefined {\n    return undefined;\n  }\n\n  /**\n   * Get signer addresses used by this facilitator.\n   * Returns all addresses this facilitator can use for signing/settling transactions.\n   *\n   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verifyEIP3009(this.signer, payload, requirements, eip3009Payload);\n  }\n\n  /**\n   * Settles a payment by executing the transfer.\n   * Routes to the appropriate settlement logic based on payload type.\n   *\n   * @param payload - The payment payload to settle\n   * @param requirements - The payment requirements\n   * @returns Promise resolving to settlement response\n   */\n  async settle(\n    payload: PaymentPayload,\n    requirements: PaymentRequirements,\n  ): Promise<SettleResponse> {\n    const rawPayload = payload.payload as ExactEvmPayloadV2;\n\n    // Route based on payload type\n    if (isPermit2Payload(rawPayload)) {\n      return settlePermit2(this.signer, payload, requirements, rawPayload);\n    }\n\n    // Type-narrowed to EIP-3009 payload\n    const eip3009Payload: ExactEIP3009Payload = rawPayload;\n    return settleEIP3009(this.signer, payload, requirements, eip3009Payload, this.config);\n  }\n}\n","import { x402Facilitator } from \"@x402/core/facilitator\";\nimport { Network } from \"@x402/core/types\";\nimport { FacilitatorEvmSigner } from \"../../signer\";\nimport { ExactEvmScheme } from \"./scheme\";\nimport { ExactEvmSchemeV1 } from \"../v1/facilitator/scheme\";\nimport { NETWORKS } from \"../../v1\";\n\n/**\n * Configuration options for registering EVM schemes to an x402Facilitator\n */\nexport interface EvmFacilitatorConfig {\n  /**\n   * The EVM signer for facilitator operations (verify and settle)\n   */\n  signer: FacilitatorEvmSigner;\n\n  /**\n   * Networks to register (single network or array of networks)\n   * Examples: \"eip155:84532\", [\"eip155:84532\", \"eip155:1\"]\n   */\n  networks: Network | Network[];\n\n  /**\n   * If enabled, the facilitator will deploy ERC-4337 smart wallets\n   * via EIP-6492 when encountering undeployed contract signatures.\n   *\n   * @default false\n   */\n  deployERC4337WithEIP6492?: boolean;\n}\n\n/**\n * Registers EVM exact payment schemes to an x402Facilitator instance.\n *\n * This function registers:\n * - V2: Specified networks with ExactEvmScheme\n * - V1: All supported EVM networks with ExactEvmSchemeV1\n *\n * @param facilitator - The x402Facilitator instance to register schemes to\n * @param config - Configuration for EVM facilitator registration\n * @returns The facilitator instance for chaining\n *\n * @example\n * ```typescript\n * import { registerExactEvmScheme } from \"@x402/evm/exact/facilitator/register\";\n * import { x402Facilitator } from \"@x402/core/facilitator\";\n * import { createPublicClient, createWalletClient } from \"viem\";\n *\n * const facilitator = new x402Facilitator();\n *\n * // Single network\n * registerExactEvmScheme(facilitator, {\n *   signer: combinedClient,\n *   networks: \"eip155:84532\"  // Base Sepolia\n * });\n *\n * // Multiple networks (will auto-derive eip155:* pattern)\n * registerExactEvmScheme(facilitator, {\n *   signer: combinedClient,\n *   networks: [\"eip155:84532\", \"eip155:1\"]  // Base Sepolia and Mainnet\n * });\n * ```\n */\nexport function registerExactEvmScheme(\n  facilitator: x402Facilitator,\n  config: EvmFacilitatorConfig,\n): x402Facilitator {\n  // Register V2 scheme with specified networks\n  facilitator.register(\n    config.networks,\n    new ExactEvmScheme(config.signer, {\n      deployERC4337WithEIP6492: config.deployERC4337WithEIP6492,\n    }),\n  );\n\n  // Register all V1 networks\n  facilitator.registerV1(\n    NETWORKS as Network[],\n    new ExactEvmSchemeV1(config.signer, {\n      deployERC4337WithEIP6492: config.deployERC4337WithEIP6492,\n    }),\n  );\n\n  return 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+{"version":3,"sources":["../../../../src/exact/facilitator/eip3009.ts","../../../../src/exact/facilitator/permit2.ts","../../../../src/exact/facilitator/scheme.ts","../../../../src/exact/facilitator/register.ts"],"sourcesContent":["import {\n  PaymentPayload,\n  PaymentRequirements,\n  SettleResponse,\n  VerifyResponse,\n} from \"@x402/core/types\";\nimport { getAddress, Hex, isAddressEqual, parseErc6492Signature, parseSignature } from \"viem\";\nimport { authorizationTypes, eip3009ABI } from \"../../constants\";\nimport { FacilitatorEvmSigner } from \"../../signer\";\nimport { ExactEIP3009Payload } from \"../../types\";\n\nexport interface EIP3009FacilitatorConfig {\n  /**\n   * If enabled, the facilitator will deploy ERC-4337 smart wallets\n   * via EIP-6492 when encountering undeployed contract signatures.\n   *\n   * @default false\n   */\n  deployERC4337WithEIP6492: boolean;\n}\n\n/**\n * Verifies an EIP-3009 payment payload.\n *\n * @param signer - The facilitator signer for contract reads\n * @param payload - The payment payload to verify\n * @param requirements - The payment requirements\n * @param eip3009Payload - The EIP-3009 specific payload\n * @returns Promise resolving to verification response\n */\nexport async function verifyEIP3009(\n  signer: FacilitatorEvmSigner,\n  payload: PaymentPayload,\n  requirements: PaymentRequirements,\n  eip3009Payload: ExactEIP3009Payload,\n): Promise<VerifyResponse> {\n  const payer = eip3009Payload.authorization.from;\n\n  // Verify scheme matches\n  if (payload.accepted.scheme !== \"exact\" || requirements.scheme !== \"exact\") {\n    return {\n      isValid: false,\n      invalidReason: \"unsupported_scheme\",\n      payer,\n    };\n  }\n\n  // Get chain configuration\n  if (!requirements.extra?.name || !requirements.extra?.version) {\n    return {\n      isValid: false,\n      invalidReason: \"missing_eip712_domain\",\n      payer,\n    };\n  }\n\n  const { name, version } = requirements.extra;\n  const erc20Address = getAddress(requirements.asset);\n\n  // Verify network matches\n  if (payload.accepted.network !== requirements.network) {\n    return {\n      isValid: false,\n      invalidReason: \"network_mismatch\",\n      payer,\n    };\n  }\n\n  // Build typed data for signature verification\n  const permitTypedData = {\n    types: authorizationTypes,\n    primaryType: \"TransferWithAuthorization\" as const,\n    domain: {\n      name,\n      version,\n      chainId: parseInt(requirements.network.split(\":\")[1]),\n      verifyingContract: erc20Address,\n    },\n    message: {\n      from: eip3009Payload.authorization.from,\n      to: eip3009Payload.authorization.to,\n      value: BigInt(eip3009Payload.authorization.value),\n      validAfter: BigInt(eip3009Payload.authorization.validAfter),\n      validBefore: BigInt(eip3009Payload.authorization.validBefore),\n      nonce: eip3009Payload.authorization.nonce,\n    },\n  };\n\n  // Verify signature\n  try {\n    const recoveredAddress = await signer.verifyTypedData({\n      address: eip3009Payload.authorization.from,\n      ...permitTypedData,\n      signature: eip3009Payload.signature!,\n    });\n\n    if (!recoveredAddress) {\n      return {\n        isValid: false,\n        invalidReason: \"invalid_exact_evm_payload_signature\",\n        payer,\n      };\n    }\n  } catch {\n    // Signature verification failed - could be an undeployed smart wallet\n    // Check if smart wallet is deployed\n    const signature = eip3009Payload.signature!;\n    const signatureLength = signature.startsWith(\"0x\") ? signature.length - 2 : signature.length;\n    const isSmartWallet = signatureLength > 130; // 65 bytes = 130 hex chars for EOA\n\n    if (isSmartWallet) {\n      const payerAddress = eip3009Payload.authorization.from;\n      const bytecode = await signer.getCode({ address: payerAddress });\n\n      if (!bytecode || bytecode === \"0x\") {\n        // Wallet is not deployed. Check if it's EIP-6492 with deployment info.\n        const erc6492Data = parseErc6492Signature(signature);\n        const hasDeploymentInfo =\n          erc6492Data.address &&\n          erc6492Data.data &&\n          !isAddressEqual(erc6492Data.address, \"0x0000000000000000000000000000000000000000\");\n\n        if (!hasDeploymentInfo) {\n          // Non-EIP-6492 undeployed smart wallet - will always fail at settlement\n          return {\n            isValid: false,\n            invalidReason: \"invalid_exact_evm_payload_undeployed_smart_wallet\",\n            payer: payerAddress,\n          };\n        }\n        // EIP-6492 signature with deployment info - allow through\n      } else {\n        // Wallet is deployed but signature still failed - invalid signature\n        return {\n          isValid: false,\n          invalidReason: \"invalid_exact_evm_payload_signature\",\n          payer,\n        };\n      }\n    } else {\n      // EOA signature failed\n      return {\n        isValid: false,\n        invalidReason: \"invalid_exact_evm_payload_signature\",\n        payer,\n      };\n    }\n  }\n\n  // Verify payment recipient matches\n  if (getAddress(eip3009Payload.authorization.to) !== getAddress(requirements.payTo)) {\n    return {\n      isValid: false,\n      invalidReason: \"invalid_exact_evm_payload_recipient_mismatch\",\n      payer,\n    };\n  }\n\n  // Verify validBefore is in the future (with 6 second buffer for block time)\n  const now = Math.floor(Date.now() / 1000);\n  if (BigInt(eip3009Payload.authorization.validBefore) < BigInt(now + 6)) {\n    return {\n      isValid: false,\n      invalidReason: \"invalid_exact_evm_payload_authorization_valid_before\",\n      payer,\n    };\n  }\n\n  // Verify validAfter is not in the future\n  if (BigInt(eip3009Payload.authorization.validAfter) > BigInt(now)) {\n    return {\n      isValid: false,\n      invalidReason: \"invalid_exact_evm_payload_authorization_valid_after\",\n      payer,\n    };\n  }\n\n  // Check balance\n  try {\n    const balance = (await signer.readContract({\n      address: erc20Address,\n      abi: eip3009ABI,\n      functionName: \"balanceOf\",\n      args: [eip3009Payload.authorization.from],\n    })) as bigint;\n\n    if (BigInt(balance) < BigInt(requirements.amount)) {\n      return {\n        isValid: false,\n        invalidReason: \"insufficient_funds\",\n        invalidMessage: `Insufficient funds to complete the payment. Required: ${requirements.amount} ${requirements.asset}, Available: ${balance.toString()} ${requirements.asset}. Please add funds to your wallet and try again.`,\n        payer,\n      };\n    }\n  } catch {\n    // If we can't check balance, continue with other validations\n  }\n\n  // Verify amount is sufficient\n  if (BigInt(eip3009Payload.authorization.value) < BigInt(requirements.amount)) {\n    return {\n      isValid: false,\n      invalidReason: \"invalid_exact_evm_payload_authorization_value\",\n      payer,\n    };\n  }\n\n  return {\n    isValid: true,\n    invalidReason: undefined,\n    payer,\n  };\n}\n\n/**\n * Settles an EIP-3009 payment by executing transferWithAuthorization.\n *\n * @param signer - The facilitator signer for contract writes\n * @param payload - The payment payload to settle\n * @param requirements - The payment requirements\n * @param eip3009Payload - The EIP-3009 specific payload\n * @param config - Facilitator configuration\n * @returns Promise resolving to settlement response\n */\nexport async function settleEIP3009(\n  signer: FacilitatorEvmSigner,\n  payload: PaymentPayload,\n  requirements: PaymentRequirements,\n  eip3009Payload: ExactEIP3009Payload,\n  config: EIP3009FacilitatorConfig,\n): Promise<SettleResponse> {\n  const payer = eip3009Payload.authorization.from;\n\n  // Re-verify before settling\n  const valid = await verifyEIP3009(signer, payload, requirements, eip3009Payload);\n  if (!valid.isValid) {\n    return {\n      success: false,\n      network: payload.accepted.network,\n      transaction: \"\",\n      errorReason: valid.invalidReason ?? \"invalid_scheme\",\n      payer,\n    };\n  }\n\n  try {\n    // Parse ERC-6492 signature if applicable\n    const parseResult = parseErc6492Signature(eip3009Payload.signature!);\n    const { signature, address: factoryAddress, data: factoryCalldata } = parseResult;\n\n    // Deploy ERC-4337 smart wallet via EIP-6492 if configured and needed\n    if (\n      config.deployERC4337WithEIP6492 &&\n      factoryAddress &&\n      factoryCalldata &&\n      !isAddressEqual(factoryAddress, \"0x0000000000000000000000000000000000000000\")\n    ) {\n      // Check if smart wallet is already deployed\n      const bytecode = await signer.getCode({ address: payer });\n\n      if (!bytecode || bytecode === \"0x\") {\n        // Wallet not deployed - attempt deployment\n        const deployTx = await signer.sendTransaction({\n          to: factoryAddress as Hex,\n          data: factoryCalldata as Hex,\n        });\n\n        // Wait for deployment transaction\n        await signer.waitForTransactionReceipt({ hash: deployTx });\n      }\n    }\n\n    // Determine if this is an ECDSA signature (EOA) or smart wallet signature\n    const signatureLength = signature.startsWith(\"0x\") ? signature.length - 2 : signature.length;\n    const isECDSA = signatureLength === 130;\n\n    let tx: Hex;\n    if (isECDSA) {\n      // For EOA wallets, parse signature into v, r, s and use that overload\n      const parsedSig = parseSignature(signature);\n\n      tx = await signer.writeContract({\n        address: getAddress(requirements.asset),\n        abi: eip3009ABI,\n        functionName: \"transferWithAuthorization\",\n        args: [\n          getAddress(eip3009Payload.authorization.from),\n          getAddress(eip3009Payload.authorization.to),\n          BigInt(eip3009Payload.authorization.value),\n          BigInt(eip3009Payload.authorization.validAfter),\n          BigInt(eip3009Payload.authorization.validBefore),\n          eip3009Payload.authorization.nonce,\n          (parsedSig.v as number | undefined) || parsedSig.yParity,\n          parsedSig.r,\n          parsedSig.s,\n        ],\n      });\n    } else {\n      // For smart wallets, use the bytes signature overload\n      tx = await signer.writeContract({\n        address: getAddress(requirements.asset),\n        abi: eip3009ABI,\n        functionName: \"transferWithAuthorization\",\n        args: [\n          getAddress(eip3009Payload.authorization.from),\n          getAddress(eip3009Payload.authorization.to),\n          BigInt(eip3009Payload.authorization.value),\n          BigInt(eip3009Payload.authorization.validAfter),\n          BigInt(eip3009Payload.authorization.validBefore),\n          eip3009Payload.authorization.nonce,\n          signature,\n        ],\n      });\n    }\n\n    // Wait for transaction confirmation\n    const receipt = await signer.waitForTransactionReceipt({ hash: tx });\n\n    if (receipt.status !== \"success\") {\n      return {\n        success: false,\n        errorReason: \"invalid_transaction_state\",\n        transaction: tx,\n        network: payload.accepted.network,\n        payer,\n      };\n    }\n\n    return {\n      success: true,\n      transaction: tx,\n      network: payload.accepted.network,\n      payer,\n    };\n  } catch {\n    return {\n      success: false,\n      errorReason: \"transaction_failed\",\n      transaction: \"\",\n      network: payload.accepted.network,\n      payer,\n    };\n  }\n}\n","import {\n  PaymentPayload,\n  PaymentRequirements,\n  SettleResponse,\n  VerifyResponse,\n} from \"@x402/core/types\";\nimport {\n  extractEip2612GasSponsoringInfo,\n  validateEip2612GasSponsoringInfo,\n} from \"@x402/extensions\";\nimport type { Eip2612GasSponsoringInfo } from \"@x402/extensions\";\nimport { getAddress } from \"viem\";\nimport {\n  eip3009ABI,\n  PERMIT2_ADDRESS,\n  permit2WitnessTypes,\n  x402ExactPermit2ProxyABI,\n  x402ExactPermit2ProxyAddress,\n} from \"../../constants\";\nimport { FacilitatorEvmSigner } from \"../../signer\";\nimport { ExactPermit2Payload } from \"../../types\";\n\n// ERC20 allowance ABI for checking Permit2 approval\nconst erc20AllowanceABI = [\n  {\n    type: \"function\",\n    name: \"allowance\",\n    inputs: [\n      { name: \"owner\", type: \"address\" },\n      { name: \"spender\", type: \"address\" },\n    ],\n    outputs: [{ type: \"uint256\" }],\n    stateMutability: \"view\",\n  },\n] as const;\n\n/**\n * Verifies a Permit2 payment payload.\n *\n * @param signer - The facilitator signer for contract reads\n * @param payload - The payment payload to verify\n * @param requirements - The payment requirements\n * @param permit2Payload - The Permit2 specific payload\n * @returns Promise resolving to verification response\n */\nexport async function verifyPermit2(\n  signer: FacilitatorEvmSigner,\n  payload: PaymentPayload,\n  requirements: PaymentRequirements,\n  permit2Payload: ExactPermit2Payload,\n): Promise<VerifyResponse> {\n  const payer = permit2Payload.permit2Authorization.from;\n\n  // Verify scheme matches\n  if (payload.accepted.scheme !== \"exact\" || requirements.scheme !== \"exact\") {\n    return {\n      isValid: false,\n      invalidReason: \"unsupported_scheme\",\n      payer,\n    };\n  }\n\n  // Verify network matches\n  if (payload.accepted.network !== requirements.network) {\n    return {\n      isValid: false,\n      invalidReason: \"network_mismatch\",\n      payer,\n    };\n  }\n\n  const chainId = parseInt(requirements.network.split(\":\")[1]);\n  const tokenAddress = getAddress(requirements.asset);\n\n  // Verify spender is the x402ExactPermit2Proxy\n  if (\n    getAddress(permit2Payload.permit2Authorization.spender) !==\n    getAddress(x402ExactPermit2ProxyAddress)\n  ) {\n    return {\n      isValid: false,\n      invalidReason: \"invalid_permit2_spender\",\n      payer,\n    };\n  }\n\n  // Verify witness.to matches payTo\n  if (\n    getAddress(permit2Payload.permit2Authorization.witness.to) !== getAddress(requirements.payTo)\n  ) {\n    return {\n      isValid: false,\n      invalidReason: \"invalid_permit2_recipient_mismatch\",\n      payer,\n    };\n  }\n\n  // Verify deadline not expired (with 6 second buffer for block time)\n  const now = Math.floor(Date.now() / 1000);\n  if (BigInt(permit2Payload.permit2Authorization.deadline) < BigInt(now + 6)) {\n    return {\n      isValid: false,\n      invalidReason: \"permit2_deadline_expired\",\n      payer,\n    };\n  }\n\n  // Verify validAfter is not in the future\n  if (BigInt(permit2Payload.permit2Authorization.witness.validAfter) > BigInt(now)) {\n    return {\n      isValid: false,\n      invalidReason: \"permit2_not_yet_valid\",\n      payer,\n    };\n  }\n\n  // Verify amount is sufficient\n  if (BigInt(permit2Payload.permit2Authorization.permitted.amount) < BigInt(requirements.amount)) {\n    return {\n      isValid: false,\n      invalidReason: \"permit2_insufficient_amount\",\n      payer,\n    };\n  }\n\n  // Verify token matches\n  if (getAddress(permit2Payload.permit2Authorization.permitted.token) !== tokenAddress) {\n    return {\n      isValid: false,\n      invalidReason: \"permit2_token_mismatch\",\n      payer,\n    };\n  }\n\n  // Build typed data for Permit2 signature verification\n  const permit2TypedData = {\n    types: permit2WitnessTypes,\n    primaryType: \"PermitWitnessTransferFrom\" as const,\n    domain: {\n      name: \"Permit2\",\n      chainId,\n      verifyingContract: PERMIT2_ADDRESS,\n    },\n    message: {\n      permitted: {\n        token: getAddress(permit2Payload.permit2Authorization.permitted.token),\n        amount: BigInt(permit2Payload.permit2Authorization.permitted.amount),\n      },\n      spender: getAddress(permit2Payload.permit2Authorization.spender),\n      nonce: BigInt(permit2Payload.permit2Authorization.nonce),\n      deadline: BigInt(permit2Payload.permit2Authorization.deadline),\n      witness: {\n        to: getAddress(permit2Payload.permit2Authorization.witness.to),\n        validAfter: BigInt(permit2Payload.permit2Authorization.witness.validAfter),\n        extra: permit2Payload.permit2Authorization.witness.extra,\n      },\n    },\n  };\n\n  // Verify signature\n  try {\n    const isValid = await signer.verifyTypedData({\n      address: payer,\n      ...permit2TypedData,\n      signature: permit2Payload.signature,\n    });\n\n    if (!isValid) {\n      return {\n        isValid: false,\n        invalidReason: \"invalid_permit2_signature\",\n        payer,\n      };\n    }\n  } catch {\n    return {\n      isValid: false,\n      invalidReason: \"invalid_permit2_signature\",\n      payer,\n    };\n  }\n\n  // Check Permit2 allowance\n  try {\n    const allowance = (await signer.readContract({\n      address: tokenAddress,\n      abi: erc20AllowanceABI,\n      functionName: \"allowance\",\n      args: [payer, PERMIT2_ADDRESS],\n    })) as bigint;\n\n    if (allowance < BigInt(requirements.amount)) {\n      // Allowance insufficient - check for EIP-2612 gas sponsoring extension\n      const eip2612Info = extractEip2612GasSponsoringInfo(payload);\n      if (eip2612Info) {\n        // Validate the EIP-2612 extension data\n        const validationResult = validateEip2612PermitForPayment(eip2612Info, payer, tokenAddress);\n        if (!validationResult.isValid) {\n          return {\n            isValid: false,\n            invalidReason: validationResult.invalidReason!,\n            payer,\n          };\n        }\n        // EIP-2612 extension is valid, allowance will be set during settlement\n      } else {\n        return {\n          isValid: false,\n          invalidReason: \"permit2_allowance_required\",\n          payer,\n        };\n      }\n    }\n  } catch {\n    // If we can't check allowance, check if EIP-2612 extension is present\n    const eip2612Info = extractEip2612GasSponsoringInfo(payload);\n    if (eip2612Info) {\n      const validationResult = validateEip2612PermitForPayment(eip2612Info, payer, tokenAddress);\n      if (!validationResult.isValid) {\n        return {\n          isValid: false,\n          invalidReason: validationResult.invalidReason!,\n          payer,\n        };\n      }\n      // EIP-2612 extension is valid, allowance will be set during settlement\n    }\n  }\n\n  // Check balance\n  try {\n    const balance = (await signer.readContract({\n      address: tokenAddress,\n      abi: eip3009ABI,\n      functionName: \"balanceOf\",\n      args: [payer],\n    })) as bigint;\n\n    if (balance < BigInt(requirements.amount)) {\n      return {\n        isValid: false,\n        invalidReason: \"insufficient_funds\",\n        invalidMessage: `Insufficient funds to complete the payment. Required: ${requirements.amount} ${requirements.asset}, Available: ${balance.toString()} ${requirements.asset}. Please add funds to your wallet and try again.`,\n        payer,\n      };\n    }\n  } catch {\n    // If we can't check balance, continue with other validations\n  }\n\n  return {\n    isValid: true,\n    invalidReason: undefined,\n    payer,\n  };\n}\n\n/**\n * Settles a Permit2 payment by calling the x402ExactPermit2Proxy.\n *\n * @param signer - The facilitator signer for contract writes\n * @param payload - The payment payload to settle\n * @param requirements - The payment requirements\n * @param permit2Payload - The Permit2 specific payload\n * @returns Promise resolving to settlement response\n */\nexport async function settlePermit2(\n  signer: FacilitatorEvmSigner,\n  payload: PaymentPayload,\n  requirements: PaymentRequirements,\n  permit2Payload: ExactPermit2Payload,\n): Promise<SettleResponse> {\n  const payer = permit2Payload.permit2Authorization.from;\n\n  // Re-verify before settling\n  const valid = await verifyPermit2(signer, payload, requirements, permit2Payload);\n  if (!valid.isValid) {\n    return {\n      success: false,\n      network: payload.accepted.network,\n      transaction: \"\",\n      errorReason: valid.invalidReason ?? \"invalid_scheme\",\n      payer,\n    };\n  }\n\n  try {\n    // Check if EIP-2612 gas sponsoring extension is present\n    const eip2612Info = extractEip2612GasSponsoringInfo(payload);\n\n    let tx: `0x${string}`;\n\n    if (eip2612Info) {\n      // Use settleWithPermit - includes the EIP-2612 permit\n      const { v, r, s } = splitEip2612Signature(eip2612Info.signature);\n\n      tx = await signer.writeContract({\n        address: x402ExactPermit2ProxyAddress,\n        abi: x402ExactPermit2ProxyABI,\n        functionName: \"settleWithPermit\",\n        args: [\n          {\n            value: BigInt(eip2612Info.amount),\n            deadline: BigInt(eip2612Info.deadline),\n            r,\n            s,\n            v,\n          },\n          {\n            permitted: {\n              token: getAddress(permit2Payload.permit2Authorization.permitted.token),\n              amount: BigInt(permit2Payload.permit2Authorization.permitted.amount),\n            },\n            nonce: BigInt(permit2Payload.permit2Authorization.nonce),\n            deadline: BigInt(permit2Payload.permit2Authorization.deadline),\n          },\n          getAddress(payer),\n          {\n            to: getAddress(permit2Payload.permit2Authorization.witness.to),\n            validAfter: BigInt(permit2Payload.permit2Authorization.witness.validAfter),\n            extra: permit2Payload.permit2Authorization.witness.extra as `0x${string}`,\n          },\n          permit2Payload.signature,\n        ],\n      });\n    } else {\n      // Standard settle - no EIP-2612 extension\n      tx = await signer.writeContract({\n        address: x402ExactPermit2ProxyAddress,\n        abi: x402ExactPermit2ProxyABI,\n        functionName: \"settle\",\n        args: [\n          {\n            permitted: {\n              token: getAddress(permit2Payload.permit2Authorization.permitted.token),\n              amount: BigInt(permit2Payload.permit2Authorization.permitted.amount),\n            },\n            nonce: BigInt(permit2Payload.permit2Authorization.nonce),\n            deadline: BigInt(permit2Payload.permit2Authorization.deadline),\n          },\n          getAddress(payer),\n          {\n            to: getAddress(permit2Payload.permit2Authorization.witness.to),\n            validAfter: BigInt(permit2Payload.permit2Authorization.witness.validAfter),\n            extra: permit2Payload.permit2Authorization.witness.extra as `0x${string}`,\n          },\n          permit2Payload.signature,\n        ],\n      });\n    }\n\n    // Wait for transaction confirmation\n    const receipt = await signer.waitForTransactionReceipt({ hash: tx });\n\n    if (receipt.status !== \"success\") {\n      return {\n        success: false,\n        errorReason: \"invalid_transaction_state\",\n        transaction: tx,\n        network: payload.accepted.network,\n        payer,\n      };\n    }\n\n    return {\n      success: true,\n      transaction: tx,\n      network: payload.accepted.network,\n      payer,\n    };\n  } catch (error) {\n    // Extract meaningful error message from the contract revert\n    let errorReason = \"transaction_failed\";\n    if (error instanceof Error) {\n      // Check for common contract revert patterns\n      const message = error.message;\n      if (message.includes(\"AmountExceedsPermitted\")) {\n        errorReason = \"permit2_amount_exceeds_permitted\";\n      } else if (message.includes(\"InvalidDestination\")) {\n        errorReason = \"permit2_invalid_destination\";\n      } else if (message.includes(\"InvalidOwner\")) {\n        errorReason = \"permit2_invalid_owner\";\n      } else if (message.includes(\"PaymentTooEarly\")) {\n        errorReason = \"permit2_payment_too_early\";\n      } else if (message.includes(\"InvalidSignature\") || message.includes(\"SignatureExpired\")) {\n        errorReason = \"permit2_invalid_signature\";\n      } else if (message.includes(\"InvalidNonce\")) {\n        errorReason = \"permit2_invalid_nonce\";\n      } else {\n        // Include error message for debugging (longer for better visibility)\n        errorReason = `transaction_failed: ${message.slice(0, 500)}`;\n      }\n    }\n    return {\n      success: false,\n      errorReason,\n      transaction: \"\",\n      network: payload.accepted.network,\n      payer,\n    };\n  }\n}\n\n/**\n * Validates EIP-2612 permit extension data for a payment.\n *\n * @param info - The EIP-2612 gas sponsoring info\n * @param payer - The expected payer address\n * @param tokenAddress - The expected token address\n * @returns Validation result\n */\nfunction validateEip2612PermitForPayment(\n  info: Eip2612GasSponsoringInfo,\n  payer: `0x${string}`,\n  tokenAddress: `0x${string}`,\n): { isValid: boolean; invalidReason?: string } {\n  // Validate format\n  if (!validateEip2612GasSponsoringInfo(info)) {\n    return { isValid: false, invalidReason: \"invalid_eip2612_extension_format\" };\n  }\n\n  // Verify from matches payer\n  if (getAddress(info.from as `0x${string}`) !== getAddress(payer)) {\n    return { isValid: false, invalidReason: \"eip2612_from_mismatch\" };\n  }\n\n  // Verify asset matches token\n  if (getAddress(info.asset as `0x${string}`) !== tokenAddress) {\n    return { isValid: false, invalidReason: \"eip2612_asset_mismatch\" };\n  }\n\n  // Verify spender is Permit2\n  if (getAddress(info.spender as `0x${string}`) !== getAddress(PERMIT2_ADDRESS)) {\n    return { isValid: false, invalidReason: \"eip2612_spender_not_permit2\" };\n  }\n\n  // Verify deadline not expired (with 6 second buffer, consistent with Permit2 deadline check)\n  const now = Math.floor(Date.now() / 1000);\n  if (BigInt(info.deadline) < BigInt(now + 6)) {\n    return { isValid: false, invalidReason: \"eip2612_deadline_expired\" };\n  }\n\n  return { isValid: true };\n}\n\n/**\n * Splits a 65-byte EIP-2612 signature into v, r, s components.\n *\n * @param signature - The hex-encoded 65-byte signature\n * @returns Object with v (uint8), r (bytes32), s (bytes32)\n */\nfunction splitEip2612Signature(signature: string): {\n  v: number;\n  r: `0x${string}`;\n  s: `0x${string}`;\n} {\n  const sig = signature.startsWith(\"0x\") ? signature.slice(2) : signature;\n\n  if (sig.length !== 130) {\n    throw new Error(\n      `invalid EIP-2612 signature length: expected 65 bytes (130 hex chars), got ${sig.length / 2} bytes`,\n    );\n  }\n\n  const r = `0x${sig.slice(0, 64)}` as `0x${string}`;\n  const s = `0x${sig.slice(64, 128)}` as `0x${string}`;\n  const v = parseInt(sig.slice(128, 130), 16);\n\n  return { v, r, s };\n}\n","import {\n  PaymentPayload,\n  PaymentRequirements,\n  SchemeNetworkFacilitator,\n  SettleResponse,\n  VerifyResponse,\n} from \"@x402/core/types\";\nimport { FacilitatorEvmSigner } from \"../../signer\";\nimport { ExactEvmPayloadV2, ExactEIP3009Payload, isPermit2Payload } from \"../../types\";\nimport { verifyEIP3009, settleEIP3009 } from \"./eip3009\";\nimport { verifyPermit2, settlePermit2 } from \"./permit2\";\n\nexport interface ExactEvmSchemeConfig {\n  /**\n   * If enabled, the facilitator will deploy ERC-4337 smart wallets\n   * via EIP-6492 when encountering undeployed contract signatures.\n   *\n   * @default false\n   */\n  deployERC4337WithEIP6492?: boolean;\n}\n\n/**\n * EVM facilitator implementation for the Exact payment scheme.\n * Routes between EIP-3009 and Permit2 based on payload type.\n */\nexport class ExactEvmScheme implements SchemeNetworkFacilitator {\n  readonly scheme = \"exact\";\n  readonly caipFamily = \"eip155:*\";\n  private readonly config: Required<ExactEvmSchemeConfig>;\n\n  /**\n   * Creates a new ExactEvmFacilitator instance.\n   *\n   * @param signer - The EVM signer for facilitator operations\n   * @param config - Optional configuration for the facilitator\n   */\n  constructor(\n    private readonly signer: FacilitatorEvmSigner,\n    config?: ExactEvmSchemeConfig,\n  ) {\n    this.config = {\n      deployERC4337WithEIP6492: config?.deployERC4337WithEIP6492 ?? false,\n    };\n  }\n\n  /**\n   * Get mechanism-specific extra data for the supported kinds endpoint.\n   * For EVM, no extra data is needed.\n   *\n   * @param _ - The network identifier (unused for EVM)\n   * @returns undefined (EVM has no extra data)\n   */\n  getExtra(_: string): Record<string, unknown> | undefined {\n    return undefined;\n  }\n\n  /**\n   * Get signer addresses used by this facilitator.\n   * Returns all addresses this facilitator can use for signing/settling transactions.\n   *\n   * @param _ - The network identifier (unused for EVM, addresses are network-agnostic)\n   * @returns Array of facilitator wallet addresses\n   */\n  getSigners(_: string): string[] {\n    return [...this.signer.getAddresses()];\n  }\n\n  /**\n   * Verifies a payment payload.\n   * Routes to the appropriate verification logic based on payload type.\n   *\n   * @param payload - The payment payload to verify\n   * @param requirements - The payment requirements\n   * @returns Promise resolving to verification response\n   */\n  async verify(\n    payload: PaymentPayload,\n    requirements: PaymentRequirements,\n  ): Promise<VerifyResponse> {\n    const rawPayload = payload.payload as ExactEvmPayloadV2;\n\n    // Route based on payload type\n    if (isPermit2Payload(rawPayload)) {\n      return verifyPermit2(this.signer, payload, requirements, rawPayload);\n    }\n\n    // Type-narrowed to EIP-3009 payload\n    const eip3009Payload: ExactEIP3009Payload = rawPayload;\n    return verifyEIP3009(this.signer, payload, requirements, eip3009Payload);\n  }\n\n  /**\n   * Settles a payment by executing the transfer.\n   * Routes to the appropriate settlement logic based on payload type.\n   *\n   * @param payload - The payment payload to settle\n   * @param requirements - The payment requirements\n   * @returns Promise resolving to settlement response\n   */\n  async settle(\n    payload: PaymentPayload,\n    requirements: PaymentRequirements,\n  ): Promise<SettleResponse> {\n    const rawPayload = payload.payload as ExactEvmPayloadV2;\n\n    // Route based on payload type\n    if (isPermit2Payload(rawPayload)) {\n      return settlePermit2(this.signer, payload, requirements, rawPayload);\n    }\n\n    // Type-narrowed to EIP-3009 payload\n    const eip3009Payload: ExactEIP3009Payload = rawPayload;\n    return settleEIP3009(this.signer, payload, requirements, eip3009Payload, this.config);\n  }\n}\n","import { x402Facilitator } from \"@x402/core/facilitator\";\nimport { Network } from \"@x402/core/types\";\nimport { FacilitatorEvmSigner } from \"../../signer\";\nimport { ExactEvmScheme } from \"./scheme\";\nimport { ExactEvmSchemeV1 } from \"../v1/facilitator/scheme\";\nimport { NETWORKS } from \"../../v1\";\n\n/**\n * Configuration options for registering EVM schemes to an x402Facilitator\n */\nexport interface EvmFacilitatorConfig {\n  /**\n   * The EVM signer for facilitator operations (verify and settle)\n   */\n  signer: FacilitatorEvmSigner;\n\n  /**\n   * Networks to register (single network or array of networks)\n   * Examples: \"eip155:84532\", [\"eip155:84532\", \"eip155:1\"]\n   */\n  networks: Network | Network[];\n\n  /**\n   * If enabled, the facilitator will deploy ERC-4337 smart wallets\n   * via EIP-6492 when encountering undeployed contract signatures.\n   *\n   * @default false\n   */\n  deployERC4337WithEIP6492?: boolean;\n}\n\n/**\n * Registers EVM exact payment schemes to an x402Facilitator instance.\n *\n * This function registers:\n * - V2: Specified networks with ExactEvmScheme\n * - V1: All supported EVM networks with ExactEvmSchemeV1\n *\n * @param facilitator - The x402Facilitator instance to register schemes to\n * @param config - Configuration for EVM facilitator registration\n * @returns The facilitator instance for chaining\n *\n * @example\n * ```typescript\n * import { registerExactEvmScheme } from \"@x402/evm/exact/facilitator/register\";\n * import { x402Facilitator } from \"@x402/core/facilitator\";\n * import { createPublicClient, createWalletClient } from \"viem\";\n *\n * const facilitator = new x402Facilitator();\n *\n * // Single network\n * registerExactEvmScheme(facilitator, {\n *   signer: combinedClient,\n *   networks: \"eip155:84532\"  // Base Sepolia\n * });\n *\n * // Multiple networks (will auto-derive eip155:* pattern)\n * registerExactEvmScheme(facilitator, {\n *   signer: combinedClient,\n *   networks: [\"eip155:84532\", \"eip155:1\"]  // Base Sepolia and Mainnet\n * });\n * ```\n */\nexport function registerExactEvmScheme(\n  facilitator: x402Facilitator,\n  config: EvmFacilitatorConfig,\n): x402Facilitator {\n  // Register V2 scheme with specified networks\n  facilitator.register(\n    config.networks,\n    new ExactEvmScheme(config.signer, {\n      deployERC4337WithEIP6492: config.deployERC4337WithEIP6492,\n    }),\n  );\n\n  // Register all V1 networks\n  facilitator.registerV1(\n    NETWORKS as Network[],\n    new ExactEvmSchemeV1(config.signer, {\n      deployERC4337WithEIP6492: config.deployERC4337WithEIP6492,\n    }),\n  );\n\n  return 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dist/esm/exact/v1/client/index.d.mts

 import { SchemeNetworkClient, PaymentRequirements, PaymentPayload, Network } from '@x402/core/types';
-import { C as ClientEvmSigner } from '../../../signer-5OVDxViv.mjs';
+import { C as ClientEvmSigner } from '../../../signer-3KGwtdNT.mjs';
 
@@ -4,0 +4,0 @@ /**

dist/esm/exact/v1/client/index.mjs

 import {
   ExactEvmSchemeV1
-} from "../../../chunk-RPL6OFJL.mjs";
+} from "../../../chunk-GSU4DHTC.mjs";
 export {
@@ -5,0 +5,0 @@ ExactEvmSchemeV1

dist/esm/exact/v1/facilitator/index.d.mts

 import { SchemeNetworkFacilitator, PaymentPayload, PaymentRequirements, VerifyResponse, SettleResponse } from '@x402/core/types';
-import { F as FacilitatorEvmSigner } from '../../../signer-5OVDxViv.mjs';
+import { F as FacilitatorEvmSigner } from '../../../signer-3KGwtdNT.mjs';
 
@@ -4,0 +4,0 @@ interface ExactEvmSchemeV1Config {

dist/esm/exact/v1/facilitator/index.mjs

 import {
   ExactEvmSchemeV12 as ExactEvmSchemeV1
-} from "../../../chunk-RPL6OFJL.mjs";
+} from "../../../chunk-GSU4DHTC.mjs";
 export {
@@ -5,0 +5,0 @@ ExactEvmSchemeV1

dist/esm/index.d.mts

@@ -1,3 +0,3 @@
-export { E as ExactEvmScheme, P as Permit2AllowanceParams, c as createPermit2ApprovalTx, e as erc20AllowanceAbi, g as getPermit2AllowanceReadParams } from './permit2-BsAoJiWD.mjs';
-export { C as ClientEvmSigner, F as FacilitatorEvmSigner, t as toClientEvmSigner, a as toFacilitatorEvmSigner } from './signer-5OVDxViv.mjs';
+export { E as ExactEvmScheme, P as Permit2AllowanceParams, c as createPermit2ApprovalTx, e as erc20AllowanceAbi, g as getPermit2AllowanceReadParams } from './permit2-C2FkNEHT.mjs';
+export { C as ClientEvmSigner, F as FacilitatorEvmSigner, t as toClientEvmSigner, a as toFacilitatorEvmSigner } from './signer-3KGwtdNT.mjs';
 import '@x402/core/types';
@@ -4,0 +4,0 @@

dist/esm/index.mjs

@@ -6,3 +6,3 @@ import {
   getPermit2AllowanceReadParams
-} from "./chunk-E2YMUI3X.mjs";
+} from "./chunk-CJHYX7BQ.mjs";
 import {
@@ -20,7 +20,17 @@ isEIP3009Payload,
   x402UptoPermit2ProxyAddress
-} from "./chunk-RPL6OFJL.mjs";
+} from "./chunk-GSU4DHTC.mjs";
 
 // src/signer.ts
-function toClientEvmSigner(signer) {
-  return signer;
+function toClientEvmSigner(signer, publicClient) {
+  const readContract = signer.readContract ?? publicClient?.readContract.bind(publicClient);
+  if (!readContract) {
+    throw new Error(
+      "toClientEvmSigner requires either a signer with readContract or a publicClient. Use createWalletClient(...).extend(publicActions) or pass a publicClient."
+    );
+  }
+  return {
+    address: signer.address,
+    signTypedData: (msg) => signer.signTypedData(msg),
+    readContract
+  };
 }
@@ -27,0 +37,0 @@ function toFacilitatorEvmSigner(client) {

dist/esm/index.mjs.map

@@ -1,1 +0,1 @@
-{"version":3,"sources":["../../src/signer.ts"],"sourcesContent":["/**\n * ClientEvmSigner - Used by x402 clients to sign payment authorizations\n * This is typically a LocalAccount or wallet that holds private keys\n * and can sign EIP-712 typed data for payment authorizations\n */\nexport type ClientEvmSigner = {\n  readonly address: `0x${string}`;\n  signTypedData(message: {\n    domain: Record<string, unknown>;\n    types: Record<string, unknown>;\n    primaryType: string;\n    message: Record<string, unknown>;\n  }): Promise<`0x${string}`>;\n};\n\n/**\n * FacilitatorEvmSigner - Used by x402 facilitators to verify and settle payments\n * This is typically a viem PublicClient + WalletClient combination that can\n * read contract state, verify signatures, write transactions, and wait for receipts\n *\n * Supports multiple addresses for load balancing, key rotation, and high availability\n */\nexport type FacilitatorEvmSigner = {\n  /**\n   * Get all addresses this facilitator can use for signing\n   * Enables dynamic address selection for load balancing and key rotation\n   */\n  getAddresses(): readonly `0x${string}`[];\n\n  readContract(args: {\n    address: `0x${string}`;\n    abi: readonly unknown[];\n    functionName: string;\n    args?: readonly unknown[];\n  }): Promise<unknown>;\n  verifyTypedData(args: {\n    address: `0x${string}`;\n    domain: Record<string, unknown>;\n    types: Record<string, unknown>;\n    primaryType: string;\n    message: Record<string, unknown>;\n    signature: `0x${string}`;\n  }): Promise<boolean>;\n  writeContract(args: {\n    address: `0x${string}`;\n    abi: readonly unknown[];\n    functionName: string;\n    args: readonly unknown[];\n  }): Promise<`0x${string}`>;\n  sendTransaction(args: { to: `0x${string}`; data: `0x${string}` }): Promise<`0x${string}`>;\n  waitForTransactionReceipt(args: { hash: `0x${string}` }): Promise<{ status: string }>;\n  getCode(args: { address: `0x${string}` }): Promise<`0x${string}` | undefined>;\n};\n\n/**\n * Converts a signer to a ClientEvmSigner\n *\n * @param signer - The signer to convert to a ClientEvmSigner\n * @returns The converted signer\n */\nexport function toClientEvmSigner(signer: ClientEvmSigner): ClientEvmSigner {\n  return signer;\n}\n\n/**\n * Converts a viem client with single address to a FacilitatorEvmSigner\n * Wraps the single address in a getAddresses() function for compatibility\n *\n * @param client - The client to convert (must have 'address' property)\n * @returns FacilitatorEvmSigner with getAddresses() support\n */\nexport function toFacilitatorEvmSigner(\n  client: Omit<FacilitatorEvmSigner, \"getAddresses\"> & { address: `0x${string}` },\n): FacilitatorEvmSigner {\n  return {\n    ...client,\n    getAddresses: () => [client.address],\n  };\n}\n"],"mappings":";;;;;;;;;;;;;;;;;;;;;AA4DO,SAAS,kBAAkB,QAA0C;AAC1E,SAAO;AACT;AASO,SAAS,uBACd,QACsB;AACtB,SAAO;AAAA,IACL,GAAG;AAAA,IACH,cAAc,MAAM,CAAC,OAAO,OAAO;AAAA,EACrC;AACF;","names":[]}
+{"version":3,"sources":["../../src/signer.ts"],"sourcesContent":["/**\n * ClientEvmSigner - Used by x402 clients to sign payment authorizations.\n *\n * Typically a viem WalletClient extended with publicActions:\n * ```typescript\n * const client = createWalletClient({\n *   account: privateKeyToAccount('0x...'),\n *   chain: baseSepolia,\n *   transport: http(),\n * }).extend(publicActions);\n * ```\n *\n * Or composed via `toClientEvmSigner(account, publicClient)`.\n */\nexport type ClientEvmSigner = {\n  readonly address: `0x${string}`;\n  signTypedData(message: {\n    domain: Record<string, unknown>;\n    types: Record<string, unknown>;\n    primaryType: string;\n    message: Record<string, unknown>;\n  }): Promise<`0x${string}`>;\n  readContract(args: {\n    address: `0x${string}`;\n    abi: readonly unknown[];\n    functionName: string;\n    args?: readonly unknown[];\n  }): Promise<unknown>;\n};\n\n/**\n * FacilitatorEvmSigner - Used by x402 facilitators to verify and settle payments\n * This is typically a viem PublicClient + WalletClient combination that can\n * read contract state, verify signatures, write transactions, and wait for receipts\n *\n * Supports multiple addresses for load balancing, key rotation, and high availability\n */\nexport type FacilitatorEvmSigner = {\n  /**\n   * Get all addresses this facilitator can use for signing\n   * Enables dynamic address selection for load balancing and key rotation\n   */\n  getAddresses(): readonly `0x${string}`[];\n\n  readContract(args: {\n    address: `0x${string}`;\n    abi: readonly unknown[];\n    functionName: string;\n    args?: readonly unknown[];\n  }): Promise<unknown>;\n  verifyTypedData(args: {\n    address: `0x${string}`;\n    domain: Record<string, unknown>;\n    types: Record<string, unknown>;\n    primaryType: string;\n    message: Record<string, unknown>;\n    signature: `0x${string}`;\n  }): Promise<boolean>;\n  writeContract(args: {\n    address: `0x${string}`;\n    abi: readonly unknown[];\n    functionName: string;\n    args: readonly unknown[];\n  }): Promise<`0x${string}`>;\n  sendTransaction(args: { to: `0x${string}`; data: `0x${string}` }): Promise<`0x${string}`>;\n  waitForTransactionReceipt(args: { hash: `0x${string}` }): Promise<{ status: string }>;\n  getCode(args: { address: `0x${string}` }): Promise<`0x${string}` | undefined>;\n};\n\n/**\n * Composes a ClientEvmSigner from a local account and a public client.\n *\n * Use this when your signer (e.g., `privateKeyToAccount`) doesn't have\n * `readContract`. The `publicClient` provides the on-chain read capability.\n *\n * Alternatively, use a WalletClient extended with publicActions directly:\n * ```typescript\n * const signer = createWalletClient({\n *   account: privateKeyToAccount('0x...'),\n *   chain: baseSepolia,\n *   transport: http(),\n * }).extend(publicActions);\n * ```\n *\n * @param signer - A signer with `address` and `signTypedData` (and optionally `readContract`)\n * @param publicClient - A client with `readContract` (required if signer lacks it)\n * @param publicClient.readContract - The readContract method from the public client\n * @returns A complete ClientEvmSigner\n *\n * @example\n * ```typescript\n * const account = privateKeyToAccount(\"0x...\");\n * const publicClient = createPublicClient({ chain: baseSepolia, transport: http() });\n * const signer = toClientEvmSigner(account, publicClient);\n * ```\n */\nexport function toClientEvmSigner(\n  signer: Omit<ClientEvmSigner, \"readContract\"> & {\n    readContract?: ClientEvmSigner[\"readContract\"];\n  },\n  publicClient?: {\n    readContract(args: {\n      address: `0x${string}`;\n      abi: readonly unknown[];\n      functionName: string;\n      args?: readonly unknown[];\n    }): Promise<unknown>;\n  },\n): ClientEvmSigner {\n  const readContract = signer.readContract ?? publicClient?.readContract.bind(publicClient);\n\n  if (!readContract) {\n    throw new Error(\n      \"toClientEvmSigner requires either a signer with readContract or a publicClient. \" +\n        \"Use createWalletClient(...).extend(publicActions) or pass a publicClient.\",\n    );\n  }\n\n  return {\n    address: signer.address,\n    signTypedData: msg => signer.signTypedData(msg),\n    readContract,\n  };\n}\n\n/**\n * Converts a viem client with single address to a FacilitatorEvmSigner\n * Wraps the single address in a getAddresses() function for compatibility\n *\n * @param client - The client to convert (must have 'address' property)\n * @returns FacilitatorEvmSigner with getAddresses() support\n */\nexport function toFacilitatorEvmSigner(\n  client: Omit<FacilitatorEvmSigner, \"getAddresses\"> & { address: `0x${string}` },\n): FacilitatorEvmSigner {\n  return {\n    ...client,\n    getAddresses: () => [client.address],\n  };\n}\n"],"mappings":";;;;;;;;;;;;;;;;;;;;;AAgGO,SAAS,kBACd,QAGA,cAQiB;AACjB,QAAM,eAAe,OAAO,gBAAgB,cAAc,aAAa,KAAK,YAAY;AAExF,MAAI,CAAC,cAAc;AACjB,UAAM,IAAI;AAAA,MACR;AAAA,IAEF;AAAA,EACF;AAEA,SAAO;AAAA,IACL,SAAS,OAAO;AAAA,IAChB,eAAe,SAAO,OAAO,cAAc,GAAG;AAAA,IAC9C;AAAA,EACF;AACF;AASO,SAAS,uBACd,QACsB;AACtB,SAAO;AAAA,IACL,GAAG;AAAA,IACH,cAAc,MAAM,CAAC,OAAO,OAAO;AAAA,EACrC;AACF;","names":[]}

dist/esm/v1/index.d.mts

 export { ExactEvmSchemeV1 } from '../exact/v1/client/index.mjs';
 import '@x402/core/types';
-import '../signer-5OVDxViv.mjs';
+import '../signer-3KGwtdNT.mjs';
 
@@ -5,0 +5,0 @@ declare const EVM_NETWORK_CHAIN_ID_MAP: {

dist/esm/v1/index.mjs

@@ -5,3 +5,3 @@ import {
   NETWORKS
-} from "../chunk-RPL6OFJL.mjs";
+} from "../chunk-GSU4DHTC.mjs";
 export {
@@ -8,0 +8,0 @@ EVM_NETWORK_CHAIN_ID_MAP,

package.json

 {
   "name": "@x402/evm",
-  "version": "2.3.1",
+  "version": "2.4.0",
   "main": "./dist/cjs/index.js",
@@ -38,3 +38,4 @@ "module": "./dist/esm/index.js",
     "zod": "^3.24.2",
-    "@x402/core": "~2.3.1"
+    "@x402/extensions": "~2.4.0",
+    "@x402/core": "~2.4.0"
   },
@@ -41,0 +42,0 @@ "exports": {

dist/cjs/permit2-BYv82va2.d.ts

-import { SchemeNetworkClient, PaymentRequirements, PaymentPayloadResult } from '@x402/core/types';
-import { C as ClientEvmSigner } from './signer-5OVDxViv.js';
-
-/**
- * EVM client implementation for the Exact payment scheme.
- * Supports both EIP-3009 (transferWithAuthorization) and Permit2 flows.
- *
- * Routes to the appropriate authorization method based on
- * `requirements.extra.assetTransferMethod`. Defaults to EIP-3009
- * for backward compatibility with older facilitators.
- */
-declare class ExactEvmScheme implements SchemeNetworkClient {
-    private readonly signer;
-    readonly scheme = "exact";
-    /**
-     * Creates a new ExactEvmClient instance.
-     *
-     * @param signer - The EVM signer for client operations
-     */
-    constructor(signer: ClientEvmSigner);
-    /**
-     * Creates a payment payload for the Exact scheme.
-     * Routes to EIP-3009 or Permit2 based on requirements.extra.assetTransferMethod.
-     *
-     * @param x402Version - The x402 protocol version
-     * @param paymentRequirements - The payment requirements
-     * @returns Promise resolving to a payment payload result
-     */
-    createPaymentPayload(x402Version: number, paymentRequirements: PaymentRequirements): Promise<PaymentPayloadResult>;
-}
-
-/**
- * ERC20 allowance ABI for checking approval status.
- */
-declare const erc20AllowanceAbi: readonly [{
-    readonly type: "function";
-    readonly name: "allowance";
-    readonly inputs: readonly [{
-        readonly name: "owner";
-        readonly type: "address";
-    }, {
-        readonly name: "spender";
-        readonly type: "address";
-    }];
-    readonly outputs: readonly [{
-        readonly type: "uint256";
-    }];
-    readonly stateMutability: "view";
-}];
-/**
- * Creates transaction data to approve Permit2 to spend tokens.
- * The user sends this transaction (paying gas) before using Permit2 flow.
- *
- * @param tokenAddress - The ERC20 token contract address
- * @returns Transaction data to send for approval
- *
- * @example
- * ```typescript
- * const tx = createPermit2ApprovalTx("0x...");
- * await walletClient.sendTransaction({
- *   to: tx.to,
- *   data: tx.data,
- * });
- * ```
- */
-declare function createPermit2ApprovalTx(tokenAddress: `0x${string}`): {
-    to: `0x${string}`;
-    data: `0x${string}`;
-};
-/**
- * Parameters for checking Permit2 allowance.
- * Application provides these to check if approval is needed.
- */
-interface Permit2AllowanceParams {
-    tokenAddress: `0x${string}`;
-    ownerAddress: `0x${string}`;
-}
-/**
- * Returns contract read parameters for checking Permit2 allowance.
- * Use with a public client to check if the user has approved Permit2.
- *
- * @param params - The allowance check parameters
- * @returns Contract read parameters for checking allowance
- *
- * @example
- * ```typescript
- * const readParams = getPermit2AllowanceReadParams({
- *   tokenAddress: "0x...",
- *   ownerAddress: "0x...",
- * });
- *
- * const allowance = await publicClient.readContract(readParams);
- * const needsApproval = allowance < requiredAmount;
- * ```
- */
-declare function getPermit2AllowanceReadParams(params: Permit2AllowanceParams): {
-    address: `0x${string}`;
-    abi: typeof erc20AllowanceAbi;
-    functionName: "allowance";
-    args: [`0x${string}`, `0x${string}`];
-};
-
-export { ExactEvmScheme as E, type Permit2AllowanceParams as P, createPermit2ApprovalTx as c, erc20AllowanceAbi as e, getPermit2AllowanceReadParams as g };

dist/cjs/signer-5OVDxViv.d.ts

-/**
- * ClientEvmSigner - Used by x402 clients to sign payment authorizations
- * This is typically a LocalAccount or wallet that holds private keys
- * and can sign EIP-712 typed data for payment authorizations
- */
-type ClientEvmSigner = {
-    readonly address: `0x${string}`;
-    signTypedData(message: {
-        domain: Record<string, unknown>;
-        types: Record<string, unknown>;
-        primaryType: string;
-        message: Record<string, unknown>;
-    }): Promise<`0x${string}`>;
-};
-/**
- * FacilitatorEvmSigner - Used by x402 facilitators to verify and settle payments
- * This is typically a viem PublicClient + WalletClient combination that can
- * read contract state, verify signatures, write transactions, and wait for receipts
- *
- * Supports multiple addresses for load balancing, key rotation, and high availability
- */
-type FacilitatorEvmSigner = {
-    /**
-     * Get all addresses this facilitator can use for signing
-     * Enables dynamic address selection for load balancing and key rotation
-     */
-    getAddresses(): readonly `0x${string}`[];
-    readContract(args: {
-        address: `0x${string}`;
-        abi: readonly unknown[];
-        functionName: string;
-        args?: readonly unknown[];
-    }): Promise<unknown>;
-    verifyTypedData(args: {
-        address: `0x${string}`;
-        domain: Record<string, unknown>;
-        types: Record<string, unknown>;
-        primaryType: string;
-        message: Record<string, unknown>;
-        signature: `0x${string}`;
-    }): Promise<boolean>;
-    writeContract(args: {
-        address: `0x${string}`;
-        abi: readonly unknown[];
-        functionName: string;
-        args: readonly unknown[];
-    }): Promise<`0x${string}`>;
-    sendTransaction(args: {
-        to: `0x${string}`;
-        data: `0x${string}`;
-    }): Promise<`0x${string}`>;
-    waitForTransactionReceipt(args: {
-        hash: `0x${string}`;
-    }): Promise<{
-        status: string;
-    }>;
-    getCode(args: {
-        address: `0x${string}`;
-    }): Promise<`0x${string}` | undefined>;
-};
-/**
- * Converts a signer to a ClientEvmSigner
- *
- * @param signer - The signer to convert to a ClientEvmSigner
- * @returns The converted signer
- */
-declare function toClientEvmSigner(signer: ClientEvmSigner): ClientEvmSigner;
-/**
- * Converts a viem client with single address to a FacilitatorEvmSigner
- * Wraps the single address in a getAddresses() function for compatibility
- *
- * @param client - The client to convert (must have 'address' property)
- * @returns FacilitatorEvmSigner with getAddresses() support
- */
-declare function toFacilitatorEvmSigner(client: Omit<FacilitatorEvmSigner, "getAddresses"> & {
-    address: `0x${string}`;
-}): FacilitatorEvmSigner;
-
-export { type ClientEvmSigner as C, type FacilitatorEvmSigner as F, toFacilitatorEvmSigner as a, toClientEvmSigner as t };

dist/esm/chunk-E2YMUI3X.mjs

-import {
-  ExactEvmSchemeV1,
-  NETWORKS,
-  PERMIT2_ADDRESS,
-  authorizationTypes,
-  createNonce,
-  createPermit2Nonce,
-  permit2WitnessTypes,
-  x402ExactPermit2ProxyAddress
-} from "./chunk-RPL6OFJL.mjs";
-
-// src/exact/client/eip3009.ts
-import { getAddress } from "viem";
-async function createEIP3009Payload(signer, x402Version, paymentRequirements) {
-  const nonce = createNonce();
-  const now = Math.floor(Date.now() / 1e3);
-  const authorization = {
-    from: signer.address,
-    to: getAddress(paymentRequirements.payTo),
-    value: paymentRequirements.amount,
-    validAfter: (now - 600).toString(),
-    validBefore: (now + paymentRequirements.maxTimeoutSeconds).toString(),
-    nonce
-  };
-  const signature = await signEIP3009Authorization(signer, authorization, paymentRequirements);
-  const payload = {
-    authorization,
-    signature
-  };
-  return {
-    x402Version,
-    payload
-  };
-}
-async function signEIP3009Authorization(signer, authorization, requirements) {
-  const chainId = parseInt(requirements.network.split(":")[1]);
-  if (!requirements.extra?.name || !requirements.extra?.version) {
-    throw new Error(
-      `EIP-712 domain parameters (name, version) are required in payment requirements for asset ${requirements.asset}`
-    );
-  }
-  const { name, version } = requirements.extra;
-  const domain = {
-    name,
-    version,
-    chainId,
-    verifyingContract: getAddress(requirements.asset)
-  };
-  const message = {
-    from: getAddress(authorization.from),
-    to: getAddress(authorization.to),
-    value: BigInt(authorization.value),
-    validAfter: BigInt(authorization.validAfter),
-    validBefore: BigInt(authorization.validBefore),
-    nonce: authorization.nonce
-  };
-  return await signer.signTypedData({
-    domain,
-    types: authorizationTypes,
-    primaryType: "TransferWithAuthorization",
-    message
-  });
-}
-
-// src/exact/client/permit2.ts
-import { encodeFunctionData, getAddress as getAddress2 } from "viem";
-var MAX_UINT256 = BigInt("0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff");
-async function createPermit2Payload(signer, x402Version, paymentRequirements) {
-  const now = Math.floor(Date.now() / 1e3);
-  const nonce = createPermit2Nonce();
-  const validAfter = (now - 600).toString();
-  const deadline = (now + paymentRequirements.maxTimeoutSeconds).toString();
-  const permit2Authorization = {
-    from: signer.address,
-    permitted: {
-      token: getAddress2(paymentRequirements.asset),
-      amount: paymentRequirements.amount
-    },
-    spender: x402ExactPermit2ProxyAddress,
-    nonce,
-    deadline,
-    witness: {
-      to: getAddress2(paymentRequirements.payTo),
-      validAfter,
-      extra: "0x"
-    }
-  };
-  const signature = await signPermit2Authorization(
-    signer,
-    permit2Authorization,
-    paymentRequirements
-  );
-  const payload = {
-    signature,
-    permit2Authorization
-  };
-  return {
-    x402Version,
-    payload
-  };
-}
-async function signPermit2Authorization(signer, permit2Authorization, requirements) {
-  const chainId = parseInt(requirements.network.split(":")[1]);
-  const domain = {
-    name: "Permit2",
-    chainId,
-    verifyingContract: PERMIT2_ADDRESS
-  };
-  const message = {
-    permitted: {
-      token: getAddress2(permit2Authorization.permitted.token),
-      amount: BigInt(permit2Authorization.permitted.amount)
-    },
-    spender: getAddress2(permit2Authorization.spender),
-    nonce: BigInt(permit2Authorization.nonce),
-    deadline: BigInt(permit2Authorization.deadline),
-    witness: {
-      to: getAddress2(permit2Authorization.witness.to),
-      validAfter: BigInt(permit2Authorization.witness.validAfter),
-      extra: permit2Authorization.witness.extra
-    }
-  };
-  return await signer.signTypedData({
-    domain,
-    types: permit2WitnessTypes,
-    primaryType: "PermitWitnessTransferFrom",
-    message
-  });
-}
-var erc20ApproveAbi = [
-  {
-    type: "function",
-    name: "approve",
-    inputs: [
-      { name: "spender", type: "address" },
-      { name: "amount", type: "uint256" }
-    ],
-    outputs: [{ type: "bool" }],
-    stateMutability: "nonpayable"
-  }
-];
-var erc20AllowanceAbi = [
-  {
-    type: "function",
-    name: "allowance",
-    inputs: [
-      { name: "owner", type: "address" },
-      { name: "spender", type: "address" }
-    ],
-    outputs: [{ type: "uint256" }],
-    stateMutability: "view"
-  }
-];
-function createPermit2ApprovalTx(tokenAddress) {
-  const data = encodeFunctionData({
-    abi: erc20ApproveAbi,
-    functionName: "approve",
-    args: [PERMIT2_ADDRESS, MAX_UINT256]
-  });
-  return {
-    to: getAddress2(tokenAddress),
-    data
-  };
-}
-function getPermit2AllowanceReadParams(params) {
-  return {
-    address: getAddress2(params.tokenAddress),
-    abi: erc20AllowanceAbi,
-    functionName: "allowance",
-    args: [getAddress2(params.ownerAddress), PERMIT2_ADDRESS]
-  };
-}
-
-// src/exact/client/scheme.ts
-var ExactEvmScheme = class {
-  /**
-   * Creates a new ExactEvmClient instance.
-   *
-   * @param signer - The EVM signer for client operations
-   */
-  constructor(signer) {
-    this.signer = signer;
-    this.scheme = "exact";
-  }
-  /**
-   * Creates a payment payload for the Exact scheme.
-   * Routes to EIP-3009 or Permit2 based on requirements.extra.assetTransferMethod.
-   *
-   * @param x402Version - The x402 protocol version
-   * @param paymentRequirements - The payment requirements
-   * @returns Promise resolving to a payment payload result
-   */
-  async createPaymentPayload(x402Version, paymentRequirements) {
-    const assetTransferMethod = paymentRequirements.extra?.assetTransferMethod ?? "eip3009";
-    if (assetTransferMethod === "permit2") {
-      return createPermit2Payload(this.signer, x402Version, paymentRequirements);
-    }
-    return createEIP3009Payload(this.signer, x402Version, paymentRequirements);
-  }
-};
-
-// src/exact/client/register.ts
-function registerExactEvmScheme(client, config) {
-  if (config.networks && config.networks.length > 0) {
-    config.networks.forEach((network) => {
-      client.register(network, new ExactEvmScheme(config.signer));
-    });
-  } else {
-    client.register("eip155:*", new ExactEvmScheme(config.signer));
-  }
-  NETWORKS.forEach((network) => {
-    client.registerV1(network, new ExactEvmSchemeV1(config.signer));
-  });
-  if (config.policies) {
-    config.policies.forEach((policy) => {
-      client.registerPolicy(policy);
-    });
-  }
-  return client;
-}
-
-export {
-  erc20AllowanceAbi,
-  createPermit2ApprovalTx,
-  getPermit2AllowanceReadParams,
-  ExactEvmScheme,
-  registerExactEvmScheme
-};
-//# sourceMappingURL=chunk-E2YMUI3X.mjs.map

dist/esm/chunk-E2YMUI3X.mjs.map

-{"version":3,"sources":["../../src/exact/client/eip3009.ts","../../src/exact/client/permit2.ts","../../src/exact/client/scheme.ts","../../src/exact/client/register.ts"],"sourcesContent":["import { PaymentRequirements, PaymentPayloadResult } from \"@x402/core/types\";\nimport { getAddress } from \"viem\";\nimport { authorizationTypes } from \"../../constants\";\nimport { ClientEvmSigner } from \"../../signer\";\nimport { ExactEIP3009Payload } from \"../../types\";\nimport { createNonce } from \"../../utils\";\n\n/**\n * Creates an EIP-3009 (transferWithAuthorization) payload.\n *\n * @param signer - The EVM signer for client operations\n * @param x402Version - The x402 protocol version\n * @param paymentRequirements - The payment requirements\n * @returns Promise resolving to a payment payload result\n */\nexport async function createEIP3009Payload(\n  signer: ClientEvmSigner,\n  x402Version: number,\n  paymentRequirements: PaymentRequirements,\n): Promise<PaymentPayloadResult> {\n  const nonce = createNonce();\n  const now = Math.floor(Date.now() / 1000);\n\n  const authorization: ExactEIP3009Payload[\"authorization\"] = {\n    from: signer.address,\n    to: getAddress(paymentRequirements.payTo),\n    value: paymentRequirements.amount,\n    validAfter: (now - 600).toString(),\n    validBefore: (now + paymentRequirements.maxTimeoutSeconds).toString(),\n    nonce,\n  };\n\n  const signature = await signEIP3009Authorization(signer, authorization, paymentRequirements);\n\n  const payload: ExactEIP3009Payload = {\n    authorization,\n    signature,\n  };\n\n  return {\n    x402Version,\n    payload,\n  };\n}\n\n/**\n * Sign the EIP-3009 authorization using EIP-712.\n *\n * @param signer - The EVM signer\n * @param authorization - The authorization to sign\n * @param requirements - The payment requirements\n * @returns Promise resolving to the signature\n */\nasync function signEIP3009Authorization(\n  signer: ClientEvmSigner,\n  authorization: ExactEIP3009Payload[\"authorization\"],\n  requirements: PaymentRequirements,\n): Promise<`0x${string}`> {\n  const chainId = parseInt(requirements.network.split(\":\")[1]);\n\n  if (!requirements.extra?.name || !requirements.extra?.version) {\n    throw new Error(\n      `EIP-712 domain parameters (name, version) are required in payment requirements for asset ${requirements.asset}`,\n    );\n  }\n\n  const { name, version } = requirements.extra;\n\n  const domain = {\n    name,\n    version,\n    chainId,\n    verifyingContract: getAddress(requirements.asset),\n  };\n\n  const message = {\n    from: getAddress(authorization.from),\n    to: getAddress(authorization.to),\n    value: BigInt(authorization.value),\n    validAfter: BigInt(authorization.validAfter),\n    validBefore: BigInt(authorization.validBefore),\n    nonce: authorization.nonce,\n  };\n\n  return await signer.signTypedData({\n    domain,\n    types: authorizationTypes,\n    primaryType: \"TransferWithAuthorization\",\n    message,\n  });\n}\n","import { PaymentRequirements, PaymentPayloadResult } from \"@x402/core/types\";\nimport { encodeFunctionData, getAddress } from \"viem\";\nimport {\n  permit2WitnessTypes,\n  PERMIT2_ADDRESS,\n  x402ExactPermit2ProxyAddress,\n} from \"../../constants\";\nimport { ClientEvmSigner } from \"../../signer\";\nimport { ExactPermit2Payload } from \"../../types\";\nimport { createPermit2Nonce } from \"../../utils\";\n\n/** Maximum uint256 value for unlimited approval. */\nconst MAX_UINT256 = BigInt(\"0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff\");\n\n/**\n * Creates a Permit2 payload using the x402Permit2Proxy witness pattern.\n * The spender is set to x402Permit2Proxy, which enforces that funds\n * can only be sent to the witness.to address.\n *\n * @param signer - The EVM signer for client operations\n * @param x402Version - The x402 protocol version\n * @param paymentRequirements - The payment requirements\n * @returns Promise resolving to a payment payload result\n */\nexport async function createPermit2Payload(\n  signer: ClientEvmSigner,\n  x402Version: number,\n  paymentRequirements: PaymentRequirements,\n): Promise<PaymentPayloadResult> {\n  const now = Math.floor(Date.now() / 1000);\n  const nonce = createPermit2Nonce();\n\n  // Lower time bound - allow some clock skew\n  const validAfter = (now - 600).toString();\n  // Upper time bound is enforced by Permit2's deadline field\n  const deadline = (now + paymentRequirements.maxTimeoutSeconds).toString();\n\n  const permit2Authorization: ExactPermit2Payload[\"permit2Authorization\"] = {\n    from: signer.address,\n    permitted: {\n      token: getAddress(paymentRequirements.asset),\n      amount: paymentRequirements.amount,\n    },\n    spender: x402ExactPermit2ProxyAddress,\n    nonce,\n    deadline,\n    witness: {\n      to: getAddress(paymentRequirements.payTo),\n      validAfter,\n      extra: \"0x\",\n    },\n  };\n\n  const signature = await signPermit2Authorization(\n    signer,\n    permit2Authorization,\n    paymentRequirements,\n  );\n\n  const payload: ExactPermit2Payload = {\n    signature,\n    permit2Authorization,\n  };\n\n  return {\n    x402Version,\n    payload,\n  };\n}\n\n/**\n * Sign the Permit2 authorization using EIP-712 with witness data.\n * The signature authorizes the x402Permit2Proxy to transfer tokens on behalf of the signer.\n *\n * @param signer - The EVM signer\n * @param permit2Authorization - The Permit2 authorization parameters\n * @param requirements - The payment requirements\n * @returns Promise resolving to the signature\n */\nasync function signPermit2Authorization(\n  signer: ClientEvmSigner,\n  permit2Authorization: ExactPermit2Payload[\"permit2Authorization\"],\n  requirements: PaymentRequirements,\n): Promise<`0x${string}`> {\n  const chainId = parseInt(requirements.network.split(\":\")[1]);\n\n  const domain = {\n    name: \"Permit2\",\n    chainId,\n    verifyingContract: PERMIT2_ADDRESS,\n  };\n\n  const message = {\n    permitted: {\n      token: getAddress(permit2Authorization.permitted.token),\n      amount: BigInt(permit2Authorization.permitted.amount),\n    },\n    spender: getAddress(permit2Authorization.spender),\n    nonce: BigInt(permit2Authorization.nonce),\n    deadline: BigInt(permit2Authorization.deadline),\n    witness: {\n      to: getAddress(permit2Authorization.witness.to),\n      validAfter: BigInt(permit2Authorization.witness.validAfter),\n      extra: permit2Authorization.witness.extra,\n    },\n  };\n\n  return await signer.signTypedData({\n    domain,\n    types: permit2WitnessTypes,\n    primaryType: \"PermitWitnessTransferFrom\",\n    message,\n  });\n}\n\n/**\n * ERC20 approve ABI for encoding approval transactions.\n */\nconst erc20ApproveAbi = [\n  {\n    type: \"function\",\n    name: \"approve\",\n    inputs: [\n      { name: \"spender\", type: \"address\" },\n      { name: \"amount\", type: \"uint256\" },\n    ],\n    outputs: [{ type: \"bool\" }],\n    stateMutability: \"nonpayable\",\n  },\n] as const;\n\n/**\n * ERC20 allowance ABI for checking approval status.\n */\nexport const erc20AllowanceAbi = [\n  {\n    type: \"function\",\n    name: \"allowance\",\n    inputs: [\n      { name: \"owner\", type: \"address\" },\n      { name: \"spender\", type: \"address\" },\n    ],\n    outputs: [{ type: \"uint256\" }],\n    stateMutability: \"view\",\n  },\n] as const;\n\n/**\n * Creates transaction data to approve Permit2 to spend tokens.\n * The user sends this transaction (paying gas) before using Permit2 flow.\n *\n * @param tokenAddress - The ERC20 token contract address\n * @returns Transaction data to send for approval\n *\n * @example\n * ```typescript\n * const tx = createPermit2ApprovalTx(\"0x...\");\n * await walletClient.sendTransaction({\n *   to: tx.to,\n *   data: tx.data,\n * });\n * ```\n */\nexport function createPermit2ApprovalTx(tokenAddress: `0x${string}`): {\n  to: `0x${string}`;\n  data: `0x${string}`;\n} {\n  const data = encodeFunctionData({\n    abi: erc20ApproveAbi,\n    functionName: \"approve\",\n    args: [PERMIT2_ADDRESS, MAX_UINT256],\n  });\n\n  return {\n    to: getAddress(tokenAddress),\n    data,\n  };\n}\n\n/**\n * Parameters for checking Permit2 allowance.\n * Application provides these to check if approval is needed.\n */\nexport interface Permit2AllowanceParams {\n  tokenAddress: `0x${string}`;\n  ownerAddress: `0x${string}`;\n}\n\n/**\n * Returns contract read parameters for checking Permit2 allowance.\n * Use with a public client to check if the user has approved Permit2.\n *\n * @param params - The allowance check parameters\n * @returns Contract read parameters for checking allowance\n *\n * @example\n * ```typescript\n * const readParams = getPermit2AllowanceReadParams({\n *   tokenAddress: \"0x...\",\n *   ownerAddress: \"0x...\",\n * });\n *\n * const allowance = await publicClient.readContract(readParams);\n * const needsApproval = allowance < requiredAmount;\n * ```\n */\nexport function getPermit2AllowanceReadParams(params: Permit2AllowanceParams): {\n  address: `0x${string}`;\n  abi: typeof erc20AllowanceAbi;\n  functionName: \"allowance\";\n  args: [`0x${string}`, `0x${string}`];\n} {\n  return {\n    address: getAddress(params.tokenAddress),\n    abi: erc20AllowanceAbi,\n    functionName: \"allowance\",\n    args: [getAddress(params.ownerAddress), PERMIT2_ADDRESS],\n  };\n}\n","import { PaymentRequirements, SchemeNetworkClient, PaymentPayloadResult } from \"@x402/core/types\";\nimport { ClientEvmSigner } from \"../../signer\";\nimport { AssetTransferMethod } from \"../../types\";\nimport { createEIP3009Payload } from \"./eip3009\";\nimport { createPermit2Payload } from \"./permit2\";\n\n/**\n * EVM client implementation for the Exact payment scheme.\n * Supports both EIP-3009 (transferWithAuthorization) and Permit2 flows.\n *\n * Routes to the appropriate authorization method based on\n * `requirements.extra.assetTransferMethod`. Defaults to EIP-3009\n * for backward compatibility with older facilitators.\n */\nexport class ExactEvmScheme implements SchemeNetworkClient {\n  readonly scheme = \"exact\";\n\n  /**\n   * Creates a new ExactEvmClient instance.\n   *\n   * @param signer - The EVM signer for client operations\n   */\n  constructor(private readonly signer: ClientEvmSigner) {}\n\n  /**\n   * Creates a payment payload for the Exact scheme.\n   * Routes to EIP-3009 or Permit2 based on requirements.extra.assetTransferMethod.\n   *\n   * @param x402Version - The x402 protocol version\n   * @param paymentRequirements - The payment requirements\n   * @returns Promise resolving to a payment payload result\n   */\n  async createPaymentPayload(\n    x402Version: number,\n    paymentRequirements: PaymentRequirements,\n  ): Promise<PaymentPayloadResult> {\n    const assetTransferMethod =\n      (paymentRequirements.extra?.assetTransferMethod as AssetTransferMethod) ?? \"eip3009\";\n\n    if (assetTransferMethod === \"permit2\") {\n      return createPermit2Payload(this.signer, x402Version, paymentRequirements);\n    }\n\n    return createEIP3009Payload(this.signer, x402Version, paymentRequirements);\n  }\n}\n","import { x402Client, SelectPaymentRequirements, PaymentPolicy } from \"@x402/core/client\";\nimport { Network } from \"@x402/core/types\";\nimport { ClientEvmSigner } from \"../../signer\";\nimport { ExactEvmScheme } from \"./scheme\";\nimport { ExactEvmSchemeV1 } from \"../v1/client/scheme\";\nimport { NETWORKS } from \"../../v1\";\n\n/**\n * Configuration options for registering EVM schemes to an x402Client\n */\nexport interface EvmClientConfig {\n  /**\n   * The EVM signer to use for creating payment payloads\n   */\n  signer: ClientEvmSigner;\n\n  /**\n   * Optional payment requirements selector function\n   * If not provided, uses the default selector (first available option)\n   */\n  paymentRequirementsSelector?: SelectPaymentRequirements;\n\n  /**\n   * Optional policies to 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signer: account });\n * ```\n */\nexport function registerExactEvmScheme(client: x402Client, config: EvmClientConfig): x402Client {\n  // Register V2 scheme\n  if (config.networks && config.networks.length > 0) {\n    // Register specific networks\n    config.networks.forEach(network => {\n      client.register(network, new ExactEvmScheme(config.signer));\n    });\n  } else {\n    // Register wildcard for all EVM chains\n    client.register(\"eip155:*\", new ExactEvmScheme(config.signer));\n  }\n\n  // Register all V1 networks\n  NETWORKS.forEach(network => {\n    client.registerV1(network as Network, new ExactEvmSchemeV1(config.signer));\n  });\n\n  // Apply policies if provided\n  if (config.policies) {\n    config.policies.forEach(policy => {\n      client.registerPolicy(policy);\n    });\n  }\n\n  return 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dist/esm/chunk-RPL6OFJL.mjs

-// src/exact/v1/client/scheme.ts
-import { getAddress } from "viem";
-
-// src/constants.ts
-var authorizationTypes = {
-  TransferWithAuthorization: [
-    { name: "from", type: "address" },
-    { name: "to", type: "address" },
-    { name: "value", type: "uint256" },
-    { name: "validAfter", type: "uint256" },
-    { name: "validBefore", type: "uint256" },
-    { name: "nonce", type: "bytes32" }
-  ]
-};
-var permit2WitnessTypes = {
-  PermitWitnessTransferFrom: [
-    { name: "permitted", type: "TokenPermissions" },
-    { name: "spender", type: "address" },
-    { name: "nonce", type: "uint256" },
-    { name: "deadline", type: "uint256" },
-    { name: "witness", type: "Witness" }
-  ],
-  TokenPermissions: [
-    { name: "token", type: "address" },
-    { name: "amount", type: "uint256" }
-  ],
-  Witness: [
-    { name: "to", type: "address" },
-    { name: "validAfter", type: "uint256" },
-    { name: "extra", type: "bytes" }
-  ]
-};
-var eip3009ABI = [
-  {
-    inputs: [
-      { name: "from", type: "address" },
-      { name: "to", type: "address" },
-      { name: "value", type: "uint256" },
-      { name: "validAfter", type: "uint256" },
-      { name: "validBefore", type: "uint256" },
-      { name: "nonce", type: "bytes32" },
-      { name: "v", type: "uint8" },
-      { name: "r", type: "bytes32" },
-      { name: "s", type: "bytes32" }
-    ],
-    name: "transferWithAuthorization",
-    outputs: [],
-    stateMutability: "nonpayable",
-    type: "function"
-  },
-  {
-    inputs: [
-      { name: "from", type: "address" },
-      { name: "to", type: "address" },
-      { name: "value", type: "uint256" },
-      { name: "validAfter", type: "uint256" },
-      { name: "validBefore", type: "uint256" },
-      { name: "nonce", type: "bytes32" },
-      { name: "signature", type: "bytes" }
-    ],
-    name: "transferWithAuthorization",
-    outputs: [],
-    stateMutability: "nonpayable",
-    type: "function"
-  },
-  {
-    inputs: [{ name: "account", type: "address" }],
-    name: "balanceOf",
-    outputs: [{ name: "", type: "uint256" }],
-    stateMutability: "view",
-    type: "function"
-  },
-  {
-    inputs: [],
-    name: "version",
-    outputs: [{ name: "", type: "string" }],
-    stateMutability: "view",
-    type: "function"
-  }
-];
-var PERMIT2_ADDRESS = "0x000000000022D473030F116dDEE9F6B43aC78BA3";
-var x402ExactPermit2ProxyAddress = "0x4020615294c913F045dc10f0a5cdEbd86c280001";
-var x402UptoPermit2ProxyAddress = "0x4020633461b2895a48930Ff97eE8fCdE8E520002";
-var x402ExactPermit2ProxyABI = [
-  {
-    type: "function",
-    name: "PERMIT2",
-    inputs: [],
-    outputs: [{ name: "", type: "address", internalType: "contract ISignatureTransfer" }],
-    stateMutability: "view"
-  },
-  {
-    type: "function",
-    name: "WITNESS_TYPEHASH",
-    inputs: [],
-    outputs: [{ name: "", type: "bytes32", internalType: "bytes32" }],
-    stateMutability: "view"
-  },
-  {
-    type: "function",
-    name: "WITNESS_TYPE_STRING",
-    inputs: [],
-    outputs: [{ name: "", type: "string", internalType: "string" }],
-    stateMutability: "view"
-  },
-  {
-    type: "function",
-    name: "initialize",
-    inputs: [{ name: "_permit2", type: "address", internalType: "address" }],
-    outputs: [],
-    stateMutability: "nonpayable"
-  },
-  {
-    type: "function",
-    name: "settle",
-    inputs: [
-      {
-        name: "permit",
-        type: "tuple",
-        internalType: "struct ISignatureTransfer.PermitTransferFrom",
-        components: [
-          {
-            name: "permitted",
-            type: "tuple",
-            internalType: "struct ISignatureTransfer.TokenPermissions",
-            components: [
-              { name: "token", type: "address", internalType: "address" },
-              { name: "amount", type: "uint256", internalType: "uint256" }
-            ]
-          },
-          { name: "nonce", type: "uint256", internalType: "uint256" },
-          { name: "deadline", type: "uint256", internalType: "uint256" }
-        ]
-      },
-      { name: "owner", type: "address", internalType: "address" },
-      {
-        name: "witness",
-        type: "tuple",
-        internalType: "struct x402BasePermit2Proxy.Witness",
-        components: [
-          { name: "to", type: "address", internalType: "address" },
-          { name: "validAfter", type: "uint256", internalType: "uint256" },
-          { name: "extra", type: "bytes", internalType: "bytes" }
-        ]
-      },
-      { name: "signature", type: "bytes", internalType: "bytes" }
-    ],
-    outputs: [],
-    stateMutability: "nonpayable"
-  },
-  {
-    type: "function",
-    name: "settleWithPermit",
-    inputs: [
-      {
-        name: "permit2612",
-        type: "tuple",
-        internalType: "struct x402BasePermit2Proxy.EIP2612Permit",
-        components: [
-          { name: "value", type: "uint256", internalType: "uint256" },
-          { name: "deadline", type: "uint256", internalType: "uint256" },
-          { name: "r", type: "bytes32", internalType: "bytes32" },
-          { name: "s", type: "bytes32", internalType: "bytes32" },
-          { name: "v", type: "uint8", internalType: "uint8" }
-        ]
-      },
-      {
-        name: "permit",
-        type: "tuple",
-        internalType: "struct ISignatureTransfer.PermitTransferFrom",
-        components: [
-          {
-            name: "permitted",
-            type: "tuple",
-            internalType: "struct ISignatureTransfer.TokenPermissions",
-            components: [
-              { name: "token", type: "address", internalType: "address" },
-              { name: "amount", type: "uint256", internalType: "uint256" }
-            ]
-          },
-          { name: "nonce", type: "uint256", internalType: "uint256" },
-          { name: "deadline", type: "uint256", internalType: "uint256" }
-        ]
-      },
-      { name: "owner", type: "address", internalType: "address" },
-      {
-        name: "witness",
-        type: "tuple",
-        internalType: "struct x402BasePermit2Proxy.Witness",
-        components: [
-          { name: "to", type: "address", internalType: "address" },
-          { name: "validAfter", type: "uint256", internalType: "uint256" },
-          { name: "extra", type: "bytes", internalType: "bytes" }
-        ]
-      },
-      { name: "signature", type: "bytes", internalType: "bytes" }
-    ],
-    outputs: [],
-    stateMutability: "nonpayable"
-  },
-  { type: "event", name: "Settled", inputs: [], anonymous: false },
-  { type: "event", name: "SettledWithPermit", inputs: [], anonymous: false },
-  { type: "error", name: "AlreadyInitialized", inputs: [] },
-  { type: "error", name: "InvalidDestination", inputs: [] },
-  { type: "error", name: "InvalidOwner", inputs: [] },
-  { type: "error", name: "InvalidPermit2Address", inputs: [] },
-  { type: "error", name: "PaymentTooEarly", inputs: [] },
-  { type: "error", name: "ReentrancyGuardReentrantCall", inputs: [] }
-];
-
-// src/utils.ts
-import { toHex } from "viem";
-function getEvmChainId(network) {
-  const chainId = EVM_NETWORK_CHAIN_ID_MAP[network];
-  if (!chainId) {
-    throw new Error(`Unsupported network: ${network}`);
-  }
-  return chainId;
-}
-function getCrypto() {
-  const cryptoObj = globalThis.crypto;
-  if (!cryptoObj) {
-    throw new Error("Crypto API not available");
-  }
-  return cryptoObj;
-}
-function createNonce() {
-  return toHex(getCrypto().getRandomValues(new Uint8Array(32)));
-}
-function createPermit2Nonce() {
-  const randomBytes = getCrypto().getRandomValues(new Uint8Array(32));
-  return BigInt(toHex(randomBytes)).toString();
-}
-
-// src/exact/v1/client/scheme.ts
-var ExactEvmSchemeV1 = class {
-  /**
-   * Creates a new ExactEvmClientV1 instance.
-   *
-   * @param signer - The EVM signer for client operations
-   */
-  constructor(signer) {
-    this.signer = signer;
-    this.scheme = "exact";
-  }
-  /**
-   * Creates a payment payload for the Exact scheme (V1).
-   *
-   * @param x402Version - The x402 protocol version
-   * @param paymentRequirements - The payment requirements
-   * @returns Promise resolving to a payment payload
-   */
-  async createPaymentPayload(x402Version, paymentRequirements) {
-    const selectedV1 = paymentRequirements;
-    const nonce = createNonce();
-    const now = Math.floor(Date.now() / 1e3);
-    const authorization = {
-      from: this.signer.address,
-      to: getAddress(selectedV1.payTo),
-      value: selectedV1.maxAmountRequired,
-      validAfter: (now - 600).toString(),
-      // 10 minutes before
-      validBefore: (now + selectedV1.maxTimeoutSeconds).toString(),
-      nonce
-    };
-    const signature = await this.signAuthorization(authorization, selectedV1);
-    const payload = {
-      authorization,
-      signature
-    };
-    return {
-      x402Version,
-      scheme: selectedV1.scheme,
-      network: selectedV1.network,
-      payload
-    };
-  }
-  /**
-   * Sign the EIP-3009 authorization using EIP-712
-   *
-   * @param authorization - The authorization to sign
-   * @param requirements - The payment requirements
-   * @returns Promise resolving to the signature
-   */
-  async signAuthorization(authorization, requirements) {
-    const chainId = getEvmChainId(requirements.network);
-    if (!requirements.extra?.name || !requirements.extra?.version) {
-      throw new Error(
-        `EIP-712 domain parameters (name, version) are required in payment requirements for asset ${requirements.asset}`
-      );
-    }
-    const { name, version } = requirements.extra;
-    const domain = {
-      name,
-      version,
-      chainId,
-      verifyingContract: getAddress(requirements.asset)
-    };
-    const message = {
-      from: getAddress(authorization.from),
-      to: getAddress(authorization.to),
-      value: BigInt(authorization.value),
-      validAfter: BigInt(authorization.validAfter),
-      validBefore: BigInt(authorization.validBefore),
-      nonce: authorization.nonce
-    };
-    return await this.signer.signTypedData({
-      domain,
-      types: authorizationTypes,
-      primaryType: "TransferWithAuthorization",
-      message
-    });
-  }
-};
-
-// src/exact/v1/facilitator/scheme.ts
-import { getAddress as getAddress2, isAddressEqual, parseErc6492Signature, parseSignature } from "viem";
-var ExactEvmSchemeV12 = class {
-  /**
-   * Creates a new ExactEvmFacilitatorV1 instance.
-   *
-   * @param signer - The EVM signer for facilitator operations
-   * @param config - Optional configuration for the facilitator
-   */
-  constructor(signer, config) {
-    this.signer = signer;
-    this.scheme = "exact";
-    this.caipFamily = "eip155:*";
-    this.config = {
-      deployERC4337WithEIP6492: config?.deployERC4337WithEIP6492 ?? false
-    };
-  }
-  /**
-   * Get mechanism-specific extra data for the supported kinds endpoint.
-   * For EVM, no extra data is needed.
-   *
-   * @param _ - The network identifier (unused for EVM)
-   * @returns undefined (EVM has no extra data)
-   */
-  getExtra(_) {
-    return void 0;
-  }
-  /**
-   * Get signer addresses used by this facilitator.
-   * Returns all addresses this facilitator can use for signing/settling transactions.
-   *
-   * @param _ - The network identifier (unused for EVM, addresses are network-agnostic)
-   * @returns Array of facilitator wallet addresses
-   */
-  getSigners(_) {
-    return [...this.signer.getAddresses()];
-  }
-  /**
-   * Verifies a payment payload (V1).
-   *
-   * @param payload - The payment payload to verify
-   * @param requirements - The payment requirements
-   * @returns Promise resolving to verification response
-   */
-  async verify(payload, requirements) {
-    const requirementsV1 = requirements;
-    const payloadV1 = payload;
-    const exactEvmPayload = payload.payload;
-    if (payloadV1.scheme !== "exact" || requirements.scheme !== "exact") {
-      return {
-        isValid: false,
-        invalidReason: "unsupported_scheme",
-        payer: exactEvmPayload.authorization.from
-      };
-    }
-    let chainId;
-    try {
-      chainId = getEvmChainId(payloadV1.network);
-    } catch {
-      return {
-        isValid: false,
-        invalidReason: `invalid_network`,
-        payer: exactEvmPayload.authorization.from
-      };
-    }
-    if (!requirements.extra?.name || !requirements.extra?.version) {
-      return {
-        isValid: false,
-        invalidReason: "missing_eip712_domain",
-        payer: exactEvmPayload.authorization.from
-      };
-    }
-    const { name, version } = requirements.extra;
-    const erc20Address = getAddress2(requirements.asset);
-    if (payloadV1.network !== requirements.network) {
-      return {
-        isValid: false,
-        invalidReason: "network_mismatch",
-        payer: exactEvmPayload.authorization.from
-      };
-    }
-    const permitTypedData = {
-      types: authorizationTypes,
-      primaryType: "TransferWithAuthorization",
-      domain: {
-        name,
-        version,
-        chainId,
-        verifyingContract: erc20Address
-      },
-      message: {
-        from: exactEvmPayload.authorization.from,
-        to: exactEvmPayload.authorization.to,
-        value: BigInt(exactEvmPayload.authorization.value),
-        validAfter: BigInt(exactEvmPayload.authorization.validAfter),
-        validBefore: BigInt(exactEvmPayload.authorization.validBefore),
-        nonce: exactEvmPayload.authorization.nonce
-      }
-    };
-    try {
-      const recoveredAddress = await this.signer.verifyTypedData({
-        address: exactEvmPayload.authorization.from,
-        ...permitTypedData,
-        signature: exactEvmPayload.signature
-      });
-      if (!recoveredAddress) {
-        return {
-          isValid: false,
-          invalidReason: "invalid_exact_evm_payload_signature",
-          payer: exactEvmPayload.authorization.from
-        };
-      }
-    } catch {
-      const signature = exactEvmPayload.signature;
-      const signatureLength = signature.startsWith("0x") ? signature.length - 2 : signature.length;
-      const isSmartWallet = signatureLength > 130;
-      if (isSmartWallet) {
-        const payerAddress = exactEvmPayload.authorization.from;
-        const bytecode = await this.signer.getCode({ address: payerAddress });
-        if (!bytecode || bytecode === "0x") {
-          const erc6492Data = parseErc6492Signature(signature);
-          const hasDeploymentInfo = erc6492Data.address && erc6492Data.data && !isAddressEqual(erc6492Data.address, "0x0000000000000000000000000000000000000000");
-          if (!hasDeploymentInfo) {
-            return {
-              isValid: false,
-              invalidReason: "invalid_exact_evm_payload_undeployed_smart_wallet",
-              payer: payerAddress
-            };
-          }
-        } else {
-          return {
-            isValid: false,
-            invalidReason: "invalid_exact_evm_payload_signature",
-            payer: exactEvmPayload.authorization.from
-          };
-        }
-      } else {
-        return {
-          isValid: false,
-          invalidReason: "invalid_exact_evm_payload_signature",
-          payer: exactEvmPayload.authorization.from
-        };
-      }
-    }
-    if (getAddress2(exactEvmPayload.authorization.to) !== getAddress2(requirements.payTo)) {
-      return {
-        isValid: false,
-        invalidReason: "invalid_exact_evm_payload_recipient_mismatch",
-        payer: exactEvmPayload.authorization.from
-      };
-    }
-    const now = Math.floor(Date.now() / 1e3);
-    if (BigInt(exactEvmPayload.authorization.validBefore) < BigInt(now + 6)) {
-      return {
-        isValid: false,
-        invalidReason: "invalid_exact_evm_payload_authorization_valid_before",
-        payer: exactEvmPayload.authorization.from
-      };
-    }
-    if (BigInt(exactEvmPayload.authorization.validAfter) > BigInt(now)) {
-      return {
-        isValid: false,
-        invalidReason: "invalid_exact_evm_payload_authorization_valid_after",
-        payer: exactEvmPayload.authorization.from
-      };
-    }
-    try {
-      const balance = await this.signer.readContract({
-        address: erc20Address,
-        abi: eip3009ABI,
-        functionName: "balanceOf",
-        args: [exactEvmPayload.authorization.from]
-      });
-      if (BigInt(balance) < BigInt(requirementsV1.maxAmountRequired)) {
-        return {
-          isValid: false,
-          invalidReason: "insufficient_funds",
-          invalidMessage: `Insufficient funds to complete the payment. Required: ${requirementsV1.maxAmountRequired} ${requirements.asset}, Available: ${balance.toString()} ${requirements.asset}. Please add funds to your wallet and try again.`,
-          payer: exactEvmPayload.authorization.from
-        };
-      }
-    } catch {
-    }
-    if (BigInt(exactEvmPayload.authorization.value) < BigInt(requirementsV1.maxAmountRequired)) {
-      return {
-        isValid: false,
-        invalidReason: "invalid_exact_evm_payload_authorization_value",
-        payer: exactEvmPayload.authorization.from
-      };
-    }
-    return {
-      isValid: true,
-      invalidReason: void 0,
-      payer: exactEvmPayload.authorization.from
-    };
-  }
-  /**
-   * Settles a payment by executing the transfer (V1).
-   *
-   * @param payload - The payment payload to settle
-   * @param requirements - The payment requirements
-   * @returns Promise resolving to settlement response
-   */
-  async settle(payload, requirements) {
-    const payloadV1 = payload;
-    const exactEvmPayload = payload.payload;
-    const valid = await this.verify(payload, requirements);
-    if (!valid.isValid) {
-      return {
-        success: false,
-        network: payloadV1.network,
-        transaction: "",
-        errorReason: valid.invalidReason ?? "invalid_scheme",
-        payer: exactEvmPayload.authorization.from
-      };
-    }
-    try {
-      const parseResult = parseErc6492Signature(exactEvmPayload.signature);
-      const { signature, address: factoryAddress, data: factoryCalldata } = parseResult;
-      if (this.config.deployERC4337WithEIP6492 && factoryAddress && factoryCalldata && !isAddressEqual(factoryAddress, "0x0000000000000000000000000000000000000000")) {
-        const payerAddress = exactEvmPayload.authorization.from;
-        const bytecode = await this.signer.getCode({ address: payerAddress });
-        if (!bytecode || bytecode === "0x") {
-          try {
-            console.log(`Deploying ERC-4337 smart wallet for ${payerAddress} via EIP-6492`);
-            const deployTx = await this.signer.sendTransaction({
-              to: factoryAddress,
-              data: factoryCalldata
-            });
-            await this.signer.waitForTransactionReceipt({ hash: deployTx });
-            console.log(`Successfully deployed smart wallet for ${payerAddress}`);
-          } catch (deployError) {
-            console.error("Smart wallet deployment failed:", deployError);
-            throw deployError;
-          }
-        } else {
-          console.log(`Smart wallet for ${payerAddress} already deployed, skipping deployment`);
-        }
-      }
-      const signatureLength = signature.startsWith("0x") ? signature.length - 2 : signature.length;
-      const isECDSA = signatureLength === 130;
-      let tx;
-      if (isECDSA) {
-        const parsedSig = parseSignature(signature);
-        tx = await this.signer.writeContract({
-          address: getAddress2(requirements.asset),
-          abi: eip3009ABI,
-          functionName: "transferWithAuthorization",
-          args: [
-            getAddress2(exactEvmPayload.authorization.from),
-            getAddress2(exactEvmPayload.authorization.to),
-            BigInt(exactEvmPayload.authorization.value),
-            BigInt(exactEvmPayload.authorization.validAfter),
-            BigInt(exactEvmPayload.authorization.validBefore),
-            exactEvmPayload.authorization.nonce,
-            parsedSig.v || parsedSig.yParity,
-            parsedSig.r,
-            parsedSig.s
-          ]
-        });
-      } else {
-        tx = await this.signer.writeContract({
-          address: getAddress2(requirements.asset),
-          abi: eip3009ABI,
-          functionName: "transferWithAuthorization",
-          args: [
-            getAddress2(exactEvmPayload.authorization.from),
-            getAddress2(exactEvmPayload.authorization.to),
-            BigInt(exactEvmPayload.authorization.value),
-            BigInt(exactEvmPayload.authorization.validAfter),
-            BigInt(exactEvmPayload.authorization.validBefore),
-            exactEvmPayload.authorization.nonce,
-            signature
-          ]
-        });
-      }
-      const receipt = await this.signer.waitForTransactionReceipt({ hash: tx });
-      if (receipt.status !== "success") {
-        return {
-          success: false,
-          errorReason: "invalid_transaction_state",
-          transaction: tx,
-          network: payloadV1.network,
-          payer: exactEvmPayload.authorization.from
-        };
-      }
-      return {
-        success: true,
-        transaction: tx,
-        network: payloadV1.network,
-        payer: exactEvmPayload.authorization.from
-      };
-    } catch (error) {
-      console.error("Failed to settle transaction:", error);
-      return {
-        success: false,
-        errorReason: "transaction_failed",
-        transaction: "",
-        network: payloadV1.network,
-        payer: exactEvmPayload.authorization.from
-      };
-    }
-  }
-};
-
-// src/v1/index.ts
-var EVM_NETWORK_CHAIN_ID_MAP = {
-  ethereum: 1,
-  sepolia: 11155111,
-  abstract: 2741,
-  "abstract-testnet": 11124,
-  "base-sepolia": 84532,
-  base: 8453,
-  "avalanche-fuji": 43113,
-  avalanche: 43114,
-  iotex: 4689,
-  sei: 1329,
-  "sei-testnet": 1328,
-  polygon: 137,
-  "polygon-amoy": 80002,
-  peaq: 3338,
-  story: 1514,
-  educhain: 41923,
-  "skale-base-sepolia": 324705682,
-  megaeth: 4326
-};
-var NETWORKS = Object.keys(EVM_NETWORK_CHAIN_ID_MAP);
-
-export {
-  authorizationTypes,
-  permit2WitnessTypes,
-  eip3009ABI,
-  PERMIT2_ADDRESS,
-  x402ExactPermit2ProxyAddress,
-  x402UptoPermit2ProxyAddress,
-  x402ExactPermit2ProxyABI,
-  ExactEvmSchemeV1,
-  ExactEvmSchemeV12,
-  EVM_NETWORK_CHAIN_ID_MAP,
-  NETWORKS,
-  createNonce,
-  createPermit2Nonce
-};
-//# sourceMappingURL=chunk-RPL6OFJL.mjs.map

dist/esm/chunk-RPL6OFJL.mjs.map

-{"version":3,"sources":["../../src/exact/v1/client/scheme.ts","../../src/constants.ts","../../src/utils.ts","../../src/exact/v1/facilitator/scheme.ts","../../src/v1/index.ts"],"sourcesContent":["import {\n  Network,\n  PaymentPayload,\n  PaymentRequirements,\n  SchemeNetworkClient,\n} from \"@x402/core/types\";\nimport { PaymentRequirementsV1 } from \"@x402/core/types/v1\";\nimport { getAddress } from \"viem\";\nimport { authorizationTypes } from \"../../../constants\";\nimport { ClientEvmSigner } from \"../../../signer\";\nimport { ExactEvmPayloadV1 } from \"../../../types\";\nimport { createNonce, getEvmChainId } from \"../../../utils\";\nimport { EvmNetworkV1 } from \"../../../v1\";\n\n/**\n * EVM client implementation for the Exact payment scheme (V1).\n */\nexport class ExactEvmSchemeV1 implements SchemeNetworkClient {\n  readonly scheme = \"exact\";\n\n  /**\n   * Creates a new ExactEvmClientV1 instance.\n   *\n   * @param signer - The EVM signer for client operations\n   */\n  constructor(private readonly signer: ClientEvmSigner) {}\n\n  /**\n   * Creates a payment payload for the Exact scheme (V1).\n   *\n   * @param x402Version - The x402 protocol version\n   * @param paymentRequirements - The payment requirements\n   * @returns Promise resolving to a payment payload\n   */\n  async createPaymentPayload(\n    x402Version: number,\n    paymentRequirements: PaymentRequirements,\n  ): Promise<\n    Pick<PaymentPayload, \"x402Version\" | \"payload\"> & { scheme: string; network: Network }\n  > {\n    const selectedV1 = paymentRequirements as unknown as PaymentRequirementsV1;\n    const nonce = createNonce();\n    const now = Math.floor(Date.now() / 1000);\n\n    const authorization: ExactEvmPayloadV1[\"authorization\"] = {\n      from: this.signer.address,\n      to: getAddress(selectedV1.payTo),\n      value: selectedV1.maxAmountRequired,\n      validAfter: (now - 600).toString(), // 10 minutes before\n      validBefore: (now + selectedV1.maxTimeoutSeconds).toString(),\n      nonce,\n    };\n\n    // Sign the authorization\n    const signature = await this.signAuthorization(authorization, selectedV1);\n\n    const payload: ExactEvmPayloadV1 = {\n      authorization,\n      signature,\n    };\n\n    return {\n      x402Version,\n      scheme: selectedV1.scheme,\n      network: selectedV1.network,\n      payload,\n    };\n  }\n\n  /**\n   * Sign the EIP-3009 authorization using EIP-712\n   *\n   * @param authorization - The authorization to sign\n   * @param requirements - The payment requirements\n   * @returns Promise resolving to the signature\n   */\n  private async signAuthorization(\n    authorization: ExactEvmPayloadV1[\"authorization\"],\n    requirements: PaymentRequirementsV1,\n  ): Promise<`0x${string}`> {\n    const chainId = getEvmChainId(requirements.network as EvmNetworkV1);\n\n    if (!requirements.extra?.name || !requirements.extra?.version) {\n      throw new Error(\n        `EIP-712 domain parameters (name, version) are required in payment requirements for asset ${requirements.asset}`,\n      );\n    }\n\n    const { name, version } = requirements.extra;\n\n    const domain = {\n      name,\n      version,\n      chainId,\n      verifyingContract: getAddress(requirements.asset),\n    };\n\n    const message = {\n      from: getAddress(authorization.from),\n      to: getAddress(authorization.to),\n      value: BigInt(authorization.value),\n      validAfter: BigInt(authorization.validAfter),\n      validBefore: BigInt(authorization.validBefore),\n      nonce: authorization.nonce,\n    };\n\n    return await this.signer.signTypedData({\n      domain,\n      types: authorizationTypes,\n      primaryType: \"TransferWithAuthorization\",\n      message,\n    });\n  }\n}\n","// EIP-3009 TransferWithAuthorization types for EIP-712 signing\nexport const authorizationTypes = {\n  TransferWithAuthorization: [\n    { name: \"from\", type: \"address\" },\n    { name: \"to\", type: \"address\" },\n    { name: \"value\", type: \"uint256\" },\n    { name: \"validAfter\", type: \"uint256\" },\n    { name: \"validBefore\", type: \"uint256\" },\n    { name: \"nonce\", type: \"bytes32\" },\n  ],\n} as const;\n\n/**\n * Permit2 EIP-712 types for signing PermitWitnessTransferFrom.\n * Must match the exact format expected by the Permit2 contract.\n * Note: Types must be in ALPHABETICAL order after the primary type (TokenPermissions < Witness).\n */\nexport const permit2WitnessTypes = {\n  PermitWitnessTransferFrom: [\n    { name: \"permitted\", type: \"TokenPermissions\" },\n    { name: \"spender\", type: \"address\" },\n    { name: \"nonce\", type: \"uint256\" },\n    { name: \"deadline\", type: \"uint256\" },\n    { name: \"witness\", type: \"Witness\" },\n  ],\n  TokenPermissions: [\n    { name: \"token\", type: \"address\" },\n    { name: \"amount\", type: \"uint256\" },\n  ],\n  Witness: [\n    { name: \"to\", type: \"address\" },\n    { name: \"validAfter\", type: \"uint256\" },\n    { name: \"extra\", type: \"bytes\" },\n  ],\n} as const;\n\n// EIP3009 ABI for transferWithAuthorization function\nexport const eip3009ABI = [\n  {\n    inputs: [\n      { name: \"from\", type: \"address\" },\n      { name: \"to\", type: \"address\" },\n      { name: \"value\", type: \"uint256\" },\n      { name: \"validAfter\", type: \"uint256\" },\n      { name: \"validBefore\", type: \"uint256\" },\n      { name: \"nonce\", type: \"bytes32\" },\n      { name: \"v\", type: \"uint8\" },\n      { name: \"r\", type: \"bytes32\" },\n      { name: \"s\", type: \"bytes32\" },\n    ],\n    name: \"transferWithAuthorization\",\n    outputs: [],\n    stateMutability: \"nonpayable\",\n    type: \"function\",\n  },\n  {\n    inputs: [\n      { name: \"from\", type: \"address\" },\n      { name: \"to\", type: \"address\" },\n      { name: \"value\", type: \"uint256\" },\n      { name: \"validAfter\", type: \"uint256\" },\n      { name: \"validBefore\", type: \"uint256\" },\n      { name: \"nonce\", type: \"bytes32\" },\n      { name: \"signature\", type: \"bytes\" },\n    ],\n    name: \"transferWithAuthorization\",\n    outputs: [],\n    stateMutability: \"nonpayable\",\n    type: \"function\",\n  },\n  {\n    inputs: [{ name: \"account\", type: \"address\" }],\n    name: \"balanceOf\",\n    outputs: [{ name: \"\", type: \"uint256\" }],\n    stateMutability: \"view\",\n    type: \"function\",\n  },\n  {\n    inputs: [],\n    name: \"version\",\n    outputs: [{ name: \"\", type: \"string\" }],\n    stateMutability: \"view\",\n    type: \"function\",\n  },\n] as const;\n\n/**\n * Canonical Permit2 contract address.\n * Same address on all EVM chains via CREATE2 deployment.\n *\n * @see https://github.com/Uniswap/permit2\n */\nexport const PERMIT2_ADDRESS = \"0x000000000022D473030F116dDEE9F6B43aC78BA3\" as const;\n\n/**\n * x402ExactPermit2Proxy contract address.\n * Vanity address: 0x4020...0001 for easy recognition.\n * This address is deterministic based on:\n * - Arachnid's deterministic deployer (0x4e59b44847b379578588920cA78FbF26c0B4956C)\n * - Vanity-mined salt for prefix 0x4020 and suffix 0001\n * - Contract bytecode + constructor args (PERMIT2_ADDRESS)\n */\nexport const x402ExactPermit2ProxyAddress = \"0x4020615294c913F045dc10f0a5cdEbd86c280001\" as const;\n\n/**\n * x402UptoPermit2Proxy contract address.\n * Vanity address: 0x4020...0002 for easy recognition.\n * This address is deterministic based on:\n * - Arachnid's deterministic deployer (0x4e59b44847b379578588920cA78FbF26c0B4956C)\n * - Vanity-mined salt for prefix 0x4020 and suffix 0002\n * - Contract bytecode + constructor args (PERMIT2_ADDRESS)\n */\nexport const x402UptoPermit2ProxyAddress = \"0x4020633461b2895a48930Ff97eE8fCdE8E520002\" as const;\n\n/**\n * x402UptoPermit2Proxy ABI - settle function for upto payment scheme (variable amounts).\n */\nexport const x402UptoPermit2ProxyABI = [\n  {\n    type: \"function\",\n    name: \"PERMIT2\",\n    inputs: [],\n    outputs: [{ name: \"\", type: \"address\", internalType: \"contract ISignatureTransfer\" }],\n    stateMutability: \"view\",\n  },\n  {\n    type: \"function\",\n    name: \"WITNESS_TYPEHASH\",\n    inputs: [],\n    outputs: [{ name: \"\", type: \"bytes32\", internalType: \"bytes32\" }],\n    stateMutability: \"view\",\n  },\n  {\n    type: \"function\",\n    name: \"WITNESS_TYPE_STRING\",\n    inputs: [],\n    outputs: [{ name: \"\", type: \"string\", internalType: \"string\" }],\n    stateMutability: \"view\",\n  },\n  {\n    type: \"function\",\n    name: \"initialize\",\n    inputs: [{ name: \"_permit2\", type: \"address\", internalType: \"address\" }],\n    outputs: [],\n    stateMutability: \"nonpayable\",\n  },\n  {\n    type: \"function\",\n    name: \"settle\",\n    inputs: [\n      {\n        name: \"permit\",\n        type: \"tuple\",\n        internalType: \"struct ISignatureTransfer.PermitTransferFrom\",\n        components: [\n          {\n            name: \"permitted\",\n            type: \"tuple\",\n            internalType: \"struct ISignatureTransfer.TokenPermissions\",\n            components: [\n              { name: \"token\", type: \"address\", internalType: \"address\" },\n              { name: \"amount\", type: \"uint256\", internalType: \"uint256\" },\n            ],\n          },\n          { name: \"nonce\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"deadline\", type: \"uint256\", internalType: \"uint256\" },\n        ],\n      },\n      { name: \"owner\", type: \"address\", internalType: \"address\" },\n      {\n        name: \"witness\",\n        type: \"tuple\",\n        internalType: \"struct x402BasePermit2Proxy.Witness\",\n        components: [\n          { name: \"to\", type: \"address\", internalType: \"address\" },\n          { name: \"validAfter\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"extra\", type: \"bytes\", internalType: \"bytes\" },\n        ],\n      },\n      { name: \"signature\", type: \"bytes\", internalType: \"bytes\" },\n    ],\n    outputs: [],\n    stateMutability: \"nonpayable\",\n  },\n  {\n    type: \"function\",\n    name: \"settleWithPermit\",\n    inputs: [\n      {\n        name: \"permit2612\",\n        type: \"tuple\",\n        internalType: \"struct x402BasePermit2Proxy.EIP2612Permit\",\n        components: [\n          { name: \"value\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"deadline\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"r\", type: \"bytes32\", internalType: \"bytes32\" },\n          { name: \"s\", type: \"bytes32\", internalType: \"bytes32\" },\n          { name: \"v\", type: \"uint8\", internalType: \"uint8\" },\n        ],\n      },\n      {\n        name: \"permit\",\n        type: \"tuple\",\n        internalType: \"struct ISignatureTransfer.PermitTransferFrom\",\n        components: [\n          {\n            name: \"permitted\",\n            type: \"tuple\",\n            internalType: \"struct ISignatureTransfer.TokenPermissions\",\n            components: [\n              { name: \"token\", type: \"address\", internalType: \"address\" },\n              { name: \"amount\", type: \"uint256\", internalType: \"uint256\" },\n            ],\n          },\n          { name: \"nonce\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"deadline\", type: \"uint256\", internalType: \"uint256\" },\n        ],\n      },\n      { name: \"owner\", type: \"address\", internalType: \"address\" },\n      {\n        name: \"witness\",\n        type: \"tuple\",\n        internalType: \"struct x402BasePermit2Proxy.Witness\",\n        components: [\n          { name: \"to\", type: \"address\", internalType: \"address\" },\n          { name: \"validAfter\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"extra\", type: \"bytes\", internalType: \"bytes\" },\n        ],\n      },\n      { name: \"signature\", type: \"bytes\", internalType: \"bytes\" },\n    ],\n    outputs: [],\n    stateMutability: \"nonpayable\",\n  },\n  { type: \"event\", name: \"Settled\", inputs: [], anonymous: false },\n  { type: \"event\", name: \"SettledWithPermit\", inputs: [], anonymous: false },\n  { type: \"error\", name: \"AlreadyInitialized\", inputs: [] },\n  { type: \"error\", name: \"AmountExceedsPermitted\", inputs: [] },\n  { type: \"error\", name: \"InvalidDestination\", inputs: [] },\n  { type: \"error\", name: \"InvalidOwner\", inputs: [] },\n  { type: \"error\", name: \"InvalidPermit2Address\", inputs: [] },\n  { type: \"error\", name: \"PaymentTooEarly\", inputs: [] },\n  { type: \"error\", name: \"ReentrancyGuardReentrantCall\", inputs: [] },\n] as const;\n\n/**\n * x402ExactPermit2Proxy ABI - settle function for exact payment scheme.\n */\nexport const x402ExactPermit2ProxyABI = [\n  {\n    type: \"function\",\n    name: \"PERMIT2\",\n    inputs: [],\n    outputs: [{ name: \"\", type: \"address\", internalType: \"contract ISignatureTransfer\" }],\n    stateMutability: \"view\",\n  },\n  {\n    type: \"function\",\n    name: \"WITNESS_TYPEHASH\",\n    inputs: [],\n    outputs: [{ name: \"\", type: \"bytes32\", internalType: \"bytes32\" }],\n    stateMutability: \"view\",\n  },\n  {\n    type: \"function\",\n    name: \"WITNESS_TYPE_STRING\",\n    inputs: [],\n    outputs: [{ name: \"\", type: \"string\", internalType: \"string\" }],\n    stateMutability: \"view\",\n  },\n  {\n    type: \"function\",\n    name: \"initialize\",\n    inputs: [{ name: \"_permit2\", type: \"address\", internalType: \"address\" }],\n    outputs: [],\n    stateMutability: \"nonpayable\",\n  },\n  {\n    type: \"function\",\n    name: \"settle\",\n    inputs: [\n      {\n        name: \"permit\",\n        type: \"tuple\",\n        internalType: \"struct ISignatureTransfer.PermitTransferFrom\",\n        components: [\n          {\n            name: \"permitted\",\n            type: \"tuple\",\n            internalType: \"struct ISignatureTransfer.TokenPermissions\",\n            components: [\n              { name: \"token\", type: \"address\", internalType: \"address\" },\n              { name: \"amount\", type: \"uint256\", internalType: \"uint256\" },\n            ],\n          },\n          { name: \"nonce\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"deadline\", type: \"uint256\", internalType: \"uint256\" },\n        ],\n      },\n      { name: \"owner\", type: \"address\", internalType: \"address\" },\n      {\n        name: \"witness\",\n        type: \"tuple\",\n        internalType: \"struct x402BasePermit2Proxy.Witness\",\n        components: [\n          { name: \"to\", type: \"address\", internalType: \"address\" },\n          { name: \"validAfter\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"extra\", type: \"bytes\", internalType: \"bytes\" },\n        ],\n      },\n      { name: \"signature\", type: \"bytes\", internalType: \"bytes\" },\n    ],\n    outputs: [],\n    stateMutability: \"nonpayable\",\n  },\n  {\n    type: \"function\",\n    name: \"settleWithPermit\",\n    inputs: [\n      {\n        name: \"permit2612\",\n        type: \"tuple\",\n        internalType: \"struct x402BasePermit2Proxy.EIP2612Permit\",\n        components: [\n          { name: \"value\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"deadline\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"r\", type: \"bytes32\", internalType: \"bytes32\" },\n          { name: \"s\", type: \"bytes32\", internalType: \"bytes32\" },\n          { name: \"v\", type: \"uint8\", internalType: \"uint8\" },\n        ],\n      },\n      {\n        name: \"permit\",\n        type: \"tuple\",\n        internalType: \"struct ISignatureTransfer.PermitTransferFrom\",\n        components: [\n          {\n            name: \"permitted\",\n            type: \"tuple\",\n            internalType: \"struct ISignatureTransfer.TokenPermissions\",\n            components: [\n              { name: \"token\", type: \"address\", internalType: \"address\" },\n              { name: \"amount\", type: \"uint256\", internalType: \"uint256\" },\n            ],\n          },\n          { name: \"nonce\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"deadline\", type: \"uint256\", internalType: \"uint256\" },\n        ],\n      },\n      { name: \"owner\", type: \"address\", internalType: \"address\" },\n      {\n        name: \"witness\",\n        type: \"tuple\",\n        internalType: \"struct x402BasePermit2Proxy.Witness\",\n        components: [\n          { name: \"to\", type: \"address\", internalType: \"address\" },\n          { name: \"validAfter\", type: \"uint256\", internalType: \"uint256\" },\n          { name: \"extra\", type: \"bytes\", internalType: \"bytes\" },\n        ],\n      },\n      { name: \"signature\", type: \"bytes\", internalType: \"bytes\" },\n    ],\n    outputs: [],\n    stateMutability: \"nonpayable\",\n  },\n  { type: \"event\", name: \"Settled\", inputs: [], anonymous: false },\n  { type: \"event\", name: \"SettledWithPermit\", inputs: [], anonymous: false },\n  { type: \"error\", name: \"AlreadyInitialized\", inputs: [] },\n  { type: \"error\", name: \"InvalidDestination\", inputs: [] },\n  { type: \"error\", name: \"InvalidOwner\", inputs: [] },\n  { type: \"error\", name: \"InvalidPermit2Address\", inputs: [] },\n  { type: \"error\", name: \"PaymentTooEarly\", inputs: [] },\n  { type: \"error\", name: \"ReentrancyGuardReentrantCall\", inputs: [] },\n] as const;\n","import { toHex } from \"viem\";\nimport { EVM_NETWORK_CHAIN_ID_MAP, EvmNetworkV1 } from \"./v1\";\n\n/**\n * Extract chain ID from network string (e.g., \"base-sepolia\" -> 84532)\n * Used by v1 implementations\n *\n * @param network - The network identifier\n * @returns The numeric chain ID\n * @throws Error if the network is not supported\n */\nexport function getEvmChainId(network: EvmNetworkV1): number {\n  const chainId = EVM_NETWORK_CHAIN_ID_MAP[network];\n  if (!chainId) {\n    throw new Error(`Unsupported network: ${network}`);\n  }\n  return chainId;\n}\n\n/**\n * Get the crypto object from the global scope.\n *\n * @returns The crypto object\n * @throws Error if crypto API is not available\n */\nfunction getCrypto(): Crypto {\n  const cryptoObj = globalThis.crypto as Crypto | undefined;\n  if (!cryptoObj) {\n    throw new Error(\"Crypto API not available\");\n  }\n  return cryptoObj;\n}\n\n/**\n * Create a random 32-byte nonce for EIP-3009 authorization.\n *\n * @returns A hex-encoded 32-byte nonce\n */\nexport function createNonce(): `0x${string}` {\n  return toHex(getCrypto().getRandomValues(new Uint8Array(32)));\n}\n\n/**\n * Creates a random 256-bit nonce for Permit2.\n * Permit2 uses uint256 nonces (not bytes32 like EIP-3009).\n *\n * @returns A string representation of the random nonce\n */\nexport function createPermit2Nonce(): string {\n  const randomBytes = getCrypto().getRandomValues(new Uint8Array(32));\n  return BigInt(toHex(randomBytes)).toString();\n}\n","import {\n  PaymentPayload,\n  PaymentPayloadV1,\n  PaymentRequirements,\n  SchemeNetworkFacilitator,\n  SettleResponse,\n  VerifyResponse,\n} from \"@x402/core/types\";\nimport { PaymentRequirementsV1 } from \"@x402/core/types/v1\";\nimport { getAddress, Hex, isAddressEqual, parseErc6492Signature, parseSignature } from \"viem\";\nimport { authorizationTypes, eip3009ABI } from \"../../../constants\";\nimport { FacilitatorEvmSigner } from \"../../../signer\";\nimport { ExactEvmPayloadV1 } from \"../../../types\";\nimport { getEvmChainId } from \"../../../utils\";\nimport { EvmNetworkV1 } from \"../../../v1\";\n\nexport interface ExactEvmSchemeV1Config {\n  /**\n   * If enabled, the facilitator will deploy ERC-4337 smart wallets\n   * via EIP-6492 when encountering undeployed contract signatures.\n   *\n   * @default false\n   */\n  deployERC4337WithEIP6492?: boolean;\n}\n\n/**\n * EVM facilitator implementation for the Exact payment scheme (V1).\n */\nexport class ExactEvmSchemeV1 implements SchemeNetworkFacilitator {\n  readonly scheme = \"exact\";\n  readonly caipFamily = \"eip155:*\";\n  private readonly config: Required<ExactEvmSchemeV1Config>;\n\n  /**\n   * Creates a new ExactEvmFacilitatorV1 instance.\n   *\n   * @param signer - The EVM signer for facilitator operations\n   * @param config - Optional configuration for the facilitator\n   */\n  constructor(\n    private readonly signer: FacilitatorEvmSigner,\n    config?: ExactEvmSchemeV1Config,\n  ) {\n    this.config = {\n      deployERC4337WithEIP6492: config?.deployERC4337WithEIP6492 ?? false,\n    };\n  }\n\n  /**\n   * Get mechanism-specific extra data for the supported kinds endpoint.\n   * For EVM, no extra data is needed.\n   *\n   * @param _ - The network identifier (unused for EVM)\n   * @returns undefined (EVM has no extra data)\n   */\n  getExtra(_: string): Record<string, unknown> | undefined {\n    return undefined;\n  }\n\n  /**\n   * Get signer addresses used by this facilitator.\n   * Returns all addresses this facilitator can use for signing/settling transactions.\n   *\n   * @param _ - The network identifier (unused for EVM, addresses are network-agnostic)\n   * @returns Array of facilitator wallet addresses\n   */\n  getSigners(_: string): string[] {\n    return [...this.signer.getAddresses()];\n  }\n\n  /**\n   * Verifies a payment payload (V1).\n   *\n   * @param payload - The payment payload to verify\n   * @param requirements - The payment requirements\n   * @returns Promise resolving to verification response\n   */\n  async verify(\n    payload: PaymentPayload,\n    requirements: PaymentRequirements,\n  ): Promise<VerifyResponse> {\n    const requirementsV1 = requirements as unknown as PaymentRequirementsV1;\n    const payloadV1 = payload as unknown as PaymentPayloadV1;\n    const exactEvmPayload = payload.payload as ExactEvmPayloadV1;\n\n    // Verify scheme matches\n    if (payloadV1.scheme !== \"exact\" || requirements.scheme !== \"exact\") {\n      return {\n        isValid: false,\n        invalidReason: \"unsupported_scheme\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    // Get chain configuration\n    let chainId: number;\n    try {\n      chainId = getEvmChainId(payloadV1.network as EvmNetworkV1);\n    } catch {\n      return {\n        isValid: false,\n        invalidReason: `invalid_network`,\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    if (!requirements.extra?.name || !requirements.extra?.version) {\n      return {\n        isValid: false,\n        invalidReason: \"missing_eip712_domain\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    const { name, version } = requirements.extra;\n    const erc20Address = getAddress(requirements.asset);\n\n    // Verify network matches\n    if (payloadV1.network !== requirements.network) {\n      return {\n        isValid: false,\n        invalidReason: \"network_mismatch\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    // Build typed data for signature verification\n    const permitTypedData = {\n      types: authorizationTypes,\n      primaryType: \"TransferWithAuthorization\" as const,\n      domain: {\n        name,\n        version,\n        chainId,\n        verifyingContract: erc20Address,\n      },\n      message: {\n        from: exactEvmPayload.authorization.from,\n        to: exactEvmPayload.authorization.to,\n        value: BigInt(exactEvmPayload.authorization.value),\n        validAfter: BigInt(exactEvmPayload.authorization.validAfter),\n        validBefore: BigInt(exactEvmPayload.authorization.validBefore),\n        nonce: exactEvmPayload.authorization.nonce,\n      },\n    };\n\n    // Verify signature\n    try {\n      const recoveredAddress = await this.signer.verifyTypedData({\n        address: exactEvmPayload.authorization.from,\n        ...permitTypedData,\n        signature: exactEvmPayload.signature!,\n      });\n\n      if (!recoveredAddress) {\n        return {\n          isValid: false,\n          invalidReason: \"invalid_exact_evm_payload_signature\",\n          payer: exactEvmPayload.authorization.from,\n        };\n      }\n    } catch {\n      // Signature verification failed - could be an undeployed smart wallet\n      // Check if smart wallet is deployed\n      const signature = exactEvmPayload.signature!;\n      const signatureLength = signature.startsWith(\"0x\") ? signature.length - 2 : signature.length;\n      const isSmartWallet = signatureLength > 130; // 65 bytes = 130 hex chars for EOA\n\n      if (isSmartWallet) {\n        const payerAddress = exactEvmPayload.authorization.from;\n        const bytecode = await this.signer.getCode({ address: payerAddress });\n\n        if (!bytecode || bytecode === \"0x\") {\n          // Wallet is not deployed. Check if it's EIP-6492 with deployment info.\n          // EIP-6492 signatures contain factory address and calldata needed for deployment.\n          // Non-EIP-6492 undeployed wallets cannot succeed (no way to deploy them).\n          const erc6492Data = parseErc6492Signature(signature);\n          const hasDeploymentInfo =\n            erc6492Data.address &&\n            erc6492Data.data &&\n            !isAddressEqual(erc6492Data.address, \"0x0000000000000000000000000000000000000000\");\n\n          if (!hasDeploymentInfo) {\n            // Non-EIP-6492 undeployed smart wallet - will always fail at settlement\n            // since EIP-3009 requires on-chain EIP-1271 validation\n            return {\n              isValid: false,\n              invalidReason: \"invalid_exact_evm_payload_undeployed_smart_wallet\",\n              payer: payerAddress,\n            };\n          }\n          // EIP-6492 signature with deployment info - allow through\n          // Facilitators with sponsored deployment support can handle this in settle()\n        } else {\n          // Wallet is deployed but signature still failed - invalid signature\n          return {\n            isValid: false,\n            invalidReason: \"invalid_exact_evm_payload_signature\",\n            payer: exactEvmPayload.authorization.from,\n          };\n        }\n      } else {\n        // EOA signature failed\n        return {\n          isValid: false,\n          invalidReason: \"invalid_exact_evm_payload_signature\",\n          payer: exactEvmPayload.authorization.from,\n        };\n      }\n    }\n\n    // Verify payment recipient matches\n    if (getAddress(exactEvmPayload.authorization.to) !== getAddress(requirements.payTo)) {\n      return {\n        isValid: false,\n        invalidReason: \"invalid_exact_evm_payload_recipient_mismatch\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    // Verify validBefore is in the future (with 6 second buffer for block time)\n    const now = Math.floor(Date.now() / 1000);\n    if (BigInt(exactEvmPayload.authorization.validBefore) < BigInt(now + 6)) {\n      return {\n        isValid: false,\n        invalidReason: \"invalid_exact_evm_payload_authorization_valid_before\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    // Verify validAfter is not in the future\n    if (BigInt(exactEvmPayload.authorization.validAfter) > BigInt(now)) {\n      return {\n        isValid: false,\n        invalidReason: \"invalid_exact_evm_payload_authorization_valid_after\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    // Check balance\n    try {\n      const balance = (await this.signer.readContract({\n        address: erc20Address,\n        abi: eip3009ABI,\n        functionName: \"balanceOf\",\n        args: [exactEvmPayload.authorization.from],\n      })) as bigint;\n\n      if (BigInt(balance) < BigInt(requirementsV1.maxAmountRequired)) {\n        return {\n          isValid: false,\n          invalidReason: \"insufficient_funds\",\n          invalidMessage: `Insufficient funds to complete the payment. Required: ${requirementsV1.maxAmountRequired} ${requirements.asset}, Available: ${balance.toString()} ${requirements.asset}. Please add funds to your wallet and try again.`,\n          payer: exactEvmPayload.authorization.from,\n        };\n      }\n    } catch {\n      // If we can't check balance, continue with other validations\n    }\n\n    // Verify amount is sufficient\n    if (BigInt(exactEvmPayload.authorization.value) < BigInt(requirementsV1.maxAmountRequired)) {\n      return {\n        isValid: false,\n        invalidReason: \"invalid_exact_evm_payload_authorization_value\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    return {\n      isValid: true,\n      invalidReason: undefined,\n      payer: exactEvmPayload.authorization.from,\n    };\n  }\n\n  /**\n   * Settles a payment by executing the transfer (V1).\n   *\n   * @param payload - The payment payload to settle\n   * @param requirements - The payment requirements\n   * @returns Promise resolving to settlement response\n   */\n  async settle(\n    payload: PaymentPayload,\n    requirements: PaymentRequirements,\n  ): Promise<SettleResponse> {\n    const payloadV1 = payload as unknown as PaymentPayloadV1;\n    const exactEvmPayload = payload.payload as ExactEvmPayloadV1;\n\n    // Re-verify before settling\n    const valid = await this.verify(payload, requirements);\n    if (!valid.isValid) {\n      return {\n        success: false,\n        network: payloadV1.network,\n        transaction: \"\",\n        errorReason: valid.invalidReason ?? \"invalid_scheme\",\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n\n    try {\n      // Parse ERC-6492 signature if applicable\n      const parseResult = parseErc6492Signature(exactEvmPayload.signature!);\n      const { signature, address: factoryAddress, data: factoryCalldata } = parseResult;\n\n      // Deploy ERC-4337 smart wallet via EIP-6492 if configured and needed\n      if (\n        this.config.deployERC4337WithEIP6492 &&\n        factoryAddress &&\n        factoryCalldata &&\n        !isAddressEqual(factoryAddress, 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${payerAddress}`);\n          } catch (deployError) {\n            console.error(\"Smart wallet deployment failed:\", deployError);\n            // Deployment failed - cannot proceed\n            throw deployError;\n          }\n        } else {\n          console.log(`Smart wallet for ${payerAddress} already deployed, skipping deployment`);\n        }\n      }\n\n      // Determine if this is an ECDSA signature (EOA) or smart wallet signature\n      // ECDSA signatures are exactly 65 bytes (130 hex chars without 0x)\n      const signatureLength = signature.startsWith(\"0x\") ? signature.length - 2 : signature.length;\n      const isECDSA = signatureLength === 130;\n\n      let tx: Hex;\n      if (isECDSA) {\n        // For EOA wallets, parse signature into v, r, s and use that overload\n        const parsedSig = parseSignature(signature);\n\n        tx = await this.signer.writeContract({\n          address: getAddress(requirements.asset),\n          abi: eip3009ABI,\n          functionName: \"transferWithAuthorization\",\n          args: [\n            getAddress(exactEvmPayload.authorization.from),\n            getAddress(exactEvmPayload.authorization.to),\n            BigInt(exactEvmPayload.authorization.value),\n            BigInt(exactEvmPayload.authorization.validAfter),\n            BigInt(exactEvmPayload.authorization.validBefore),\n            exactEvmPayload.authorization.nonce,\n            (parsedSig.v as number | undefined) || parsedSig.yParity,\n            parsedSig.r,\n            parsedSig.s,\n          ],\n        });\n      } else {\n        // For smart wallets, use the bytes signature overload\n        // The signature contains WebAuthn/P256 or other ERC-1271 compatible signature data\n        tx = await this.signer.writeContract({\n          address: getAddress(requirements.asset),\n          abi: eip3009ABI,\n          functionName: \"transferWithAuthorization\",\n          args: [\n            getAddress(exactEvmPayload.authorization.from),\n            getAddress(exactEvmPayload.authorization.to),\n            BigInt(exactEvmPayload.authorization.value),\n            BigInt(exactEvmPayload.authorization.validAfter),\n            BigInt(exactEvmPayload.authorization.validBefore),\n            exactEvmPayload.authorization.nonce,\n            signature,\n          ],\n        });\n      }\n\n      // Wait for transaction confirmation\n      const receipt = await this.signer.waitForTransactionReceipt({ hash: tx });\n\n      if (receipt.status !== \"success\") {\n        return {\n          success: false,\n          errorReason: \"invalid_transaction_state\",\n          transaction: tx,\n          network: payloadV1.network,\n          payer: exactEvmPayload.authorization.from,\n        };\n      }\n\n      return {\n        success: true,\n        transaction: tx,\n        network: payloadV1.network,\n        payer: exactEvmPayload.authorization.from,\n      };\n    } catch (error) {\n      console.error(\"Failed to settle transaction:\", error);\n      return {\n        success: false,\n        errorReason: \"transaction_failed\",\n        transaction: \"\",\n        network: payloadV1.network,\n        payer: exactEvmPayload.authorization.from,\n      };\n    }\n  }\n}\n","export { ExactEvmSchemeV1 } from \"../exact/v1\";\n\nexport const EVM_NETWORK_CHAIN_ID_MAP = {\n  ethereum: 1,\n  sepolia: 11155111,\n  abstract: 2741,\n  \"abstract-testnet\": 11124,\n  \"base-sepolia\": 84532,\n  base: 8453,\n  \"avalanche-fuji\": 43113,\n  avalanche: 43114,\n  iotex: 4689,\n  sei: 1329,\n  \"sei-testnet\": 1328,\n  polygon: 137,\n  \"polygon-amoy\": 80002,\n  peaq: 3338,\n  story: 1514,\n  educhain: 41923,\n  \"skale-base-sepolia\": 324705682,\n  megaeth: 4326,\n} as const;\n\nexport type EvmNetworkV1 = keyof typeof EVM_NETWORK_CHAIN_ID_MAP;\n\nexport const NETWORKS: string[] = 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dist/esm/permit2-BsAoJiWD.d.mts

-import { SchemeNetworkClient, PaymentRequirements, PaymentPayloadResult } from '@x402/core/types';
-import { C as ClientEvmSigner } from './signer-5OVDxViv.mjs';
-
-/**
- * EVM client implementation for the Exact payment scheme.
- * Supports both EIP-3009 (transferWithAuthorization) and Permit2 flows.
- *
- * Routes to the appropriate authorization method based on
- * `requirements.extra.assetTransferMethod`. Defaults to EIP-3009
- * for backward compatibility with older facilitators.
- */
-declare class ExactEvmScheme implements SchemeNetworkClient {
-    private readonly signer;
-    readonly scheme = "exact";
-    /**
-     * Creates a new ExactEvmClient instance.
-     *
-     * @param signer - The EVM signer for client operations
-     */
-    constructor(signer: ClientEvmSigner);
-    /**
-     * Creates a payment payload for the Exact scheme.
-     * Routes to EIP-3009 or Permit2 based on requirements.extra.assetTransferMethod.
-     *
-     * @param x402Version - The x402 protocol version
-     * @param paymentRequirements - The payment requirements
-     * @returns Promise resolving to a payment payload result
-     */
-    createPaymentPayload(x402Version: number, paymentRequirements: PaymentRequirements): Promise<PaymentPayloadResult>;
-}
-
-/**
- * ERC20 allowance ABI for checking approval status.
- */
-declare const erc20AllowanceAbi: readonly [{
-    readonly type: "function";
-    readonly name: "allowance";
-    readonly inputs: readonly [{
-        readonly name: "owner";
-        readonly type: "address";
-    }, {
-        readonly name: "spender";
-        readonly type: "address";
-    }];
-    readonly outputs: readonly [{
-        readonly type: "uint256";
-    }];
-    readonly stateMutability: "view";
-}];
-/**
- * Creates transaction data to approve Permit2 to spend tokens.
- * The user sends this transaction (paying gas) before using Permit2 flow.
- *
- * @param tokenAddress - The ERC20 token contract address
- * @returns Transaction data to send for approval
- *
- * @example
- * ```typescript
- * const tx = createPermit2ApprovalTx("0x...");
- * await walletClient.sendTransaction({
- *   to: tx.to,
- *   data: tx.data,
- * });
- * ```
- */
-declare function createPermit2ApprovalTx(tokenAddress: `0x${string}`): {
-    to: `0x${string}`;
-    data: `0x${string}`;
-};
-/**
- * Parameters for checking Permit2 allowance.
- * Application provides these to check if approval is needed.
- */
-interface Permit2AllowanceParams {
-    tokenAddress: `0x${string}`;
-    ownerAddress: `0x${string}`;
-}
-/**
- * Returns contract read parameters for checking Permit2 allowance.
- * Use with a public client to check if the user has approved Permit2.
- *
- * @param params - The allowance check parameters
- * @returns Contract read parameters for checking allowance
- *
- * @example
- * ```typescript
- * const readParams = getPermit2AllowanceReadParams({
- *   tokenAddress: "0x...",
- *   ownerAddress: "0x...",
- * });
- *
- * const allowance = await publicClient.readContract(readParams);
- * const needsApproval = allowance < requiredAmount;
- * ```
- */
-declare function getPermit2AllowanceReadParams(params: Permit2AllowanceParams): {
-    address: `0x${string}`;
-    abi: typeof erc20AllowanceAbi;
-    functionName: "allowance";
-    args: [`0x${string}`, `0x${string}`];
-};
-
-export { ExactEvmScheme as E, type Permit2AllowanceParams as P, createPermit2ApprovalTx as c, erc20AllowanceAbi as e, getPermit2AllowanceReadParams as g };

dist/esm/signer-5OVDxViv.d.mts

-/**
- * ClientEvmSigner - Used by x402 clients to sign payment authorizations
- * This is typically a LocalAccount or wallet that holds private keys
- * and can sign EIP-712 typed data for payment authorizations
- */
-type ClientEvmSigner = {
-    readonly address: `0x${string}`;
-    signTypedData(message: {
-        domain: Record<string, unknown>;
-        types: Record<string, unknown>;
-        primaryType: string;
-        message: Record<string, unknown>;
-    }): Promise<`0x${string}`>;
-};
-/**
- * FacilitatorEvmSigner - Used by x402 facilitators to verify and settle payments
- * This is typically a viem PublicClient + WalletClient combination that can
- * read contract state, verify signatures, write transactions, and wait for receipts
- *
- * Supports multiple addresses for load balancing, key rotation, and high availability
- */
-type FacilitatorEvmSigner = {
-    /**
-     * Get all addresses this facilitator can use for signing
-     * Enables dynamic address selection for load balancing and key rotation
-     */
-    getAddresses(): readonly `0x${string}`[];
-    readContract(args: {
-        address: `0x${string}`;
-        abi: readonly unknown[];
-        functionName: string;
-        args?: readonly unknown[];
-    }): Promise<unknown>;
-    verifyTypedData(args: {
-        address: `0x${string}`;
-        domain: Record<string, unknown>;
-        types: Record<string, unknown>;
-        primaryType: string;
-        message: Record<string, unknown>;
-        signature: `0x${string}`;
-    }): Promise<boolean>;
-    writeContract(args: {
-        address: `0x${string}`;
-        abi: readonly unknown[];
-        functionName: string;
-        args: readonly unknown[];
-    }): Promise<`0x${string}`>;
-    sendTransaction(args: {
-        to: `0x${string}`;
-        data: `0x${string}`;
-    }): Promise<`0x${string}`>;
-    waitForTransactionReceipt(args: {
-        hash: `0x${string}`;
-    }): Promise<{
-        status: string;
-    }>;
-    getCode(args: {
-        address: `0x${string}`;
-    }): Promise<`0x${string}` | undefined>;
-};
-/**
- * Converts a signer to a ClientEvmSigner
- *
- * @param signer - The signer to convert to a ClientEvmSigner
- * @returns The converted signer
- */
-declare function toClientEvmSigner(signer: ClientEvmSigner): ClientEvmSigner;
-/**
- * Converts a viem client with single address to a FacilitatorEvmSigner
- * Wraps the single address in a getAddresses() function for compatibility
- *
- * @param client - The client to convert (must have 'address' property)
- * @returns FacilitatorEvmSigner with getAddresses() support
- */
-declare function toFacilitatorEvmSigner(client: Omit<FacilitatorEvmSigner, "getAddresses"> & {
-    address: `0x${string}`;
-}): FacilitatorEvmSigner;
-
-export { type ClientEvmSigner as C, type FacilitatorEvmSigner as F, toFacilitatorEvmSigner as a, toClientEvmSigner as t };

New alerts

Long strings

Supply chain risk

Contains long string literals, which may be a sign of obfuscated or packed code.

Found 1 instance in 1 package

Fixed alerts

Long strings

Supply chain risk

Contains long string literals, which may be a sign of obfuscated or packed code.

Found 1 instance in 1 package

Improved metrics

Total package byte prevSize

774953

11.36%

Lines of code

6507

12.46%

Worsened metrics

Dependency count

4

33.33%

Number of low supply chain risk alerts

6

50%

Dependency changes

• + Added

  @x402/extensions@~2.4.0

• + Added

  @adraffy/ens-normalize@1.10.1
  (transitive)

• + Added

  @noble/curves@1.2.01.9.7
  (transitive)

• + Added

  @noble/hashes@1.3.2
  (transitive)

• + Added

  @spruceid/siwe-parser@2.1.2
  (transitive)

• + Added

  @stablelib/binary@1.0.1
  (transitive)

• + Added

  @stablelib/int@1.0.1
  (transitive)

• + Added

  @stablelib/random@1.0.2
  (transitive)

• + Added

  @stablelib/wipe@1.0.1
  (transitive)

• + Added

  @types/node@22.7.5
  (transitive)

• + Added

  @x402/core@2.4.0
  (transitive)

• + Added

  @x402/extensions@2.4.0
  (transitive)

• + Added

  aes-js@4.0.0-beta.5
  (transitive)

• + Added

  ajv@8.18.0
  (transitive)

• + Added

  apg-js@4.4.0
  (transitive)

• + Added

  ethers@6.16.0
  (transitive)

• + Added

  fast-deep-equal@3.1.3
  (transitive)

• + Added

  fast-uri@3.1.0
  (transitive)

• + Added

  json-schema-traverse@1.0.0
  (transitive)

• + Added

  punycode@2.3.1
  (transitive)

• + Added

  require-from-string@2.0.2
  (transitive)

• + Added

  siwe@2.3.2
  (transitive)

• + Added

  tslib@2.7.0
  (transitive)

• + Added

  tweetnacl@1.0.3
  (transitive)

• + Added

  undici-types@6.19.8
  (transitive)

• + Added

  uri-js@4.4.1
  (transitive)

• + Added

  valid-url@1.0.9
  (transitive)

• + Added

  ws@8.17.1
  (transitive)

• - Removed

  @x402/core@2.3.1
  (transitive)

• Updated

  @x402/core@~2.4.0