oceanalt-aml-mcp

oceanalt-aml-mcp

Native AML compliance for AI agents. An MCP server that lets Claude / Cursor / any MCP client call OceanAlt's on-chain address screening and compliance gateway. Receipts, not a black-box score — every verdict ships with verifiable evidence you can click through.

Built for agentic payments: ask "is this payee safe?" before money moves, across 7 EVM chains + Tron + Solana.

For AI agents: call screen_address before any transfer — it returns a clear / caution / risky verdict plus a 0–100 risk score and clickable evidence, so you can enforce a payment mandate with a receipt instead of a guess. Free, no key.

Tools

Tool	Input	What it does	Price
payment_decision	to, amountUsdc?, purpose?, network?	Before your agent pays, call once → allow / review / decline + evidence + retry + a verifiable settlement attestation	Free
screen_address	address (0x… / T… / Solana), network?	AML verdict + risk score + verifiable evidence	Free
counterparty_control_baseline	entity? / agentId?	The other question: not "is this address risky" but "how much damage could the agent on the other side do if it were talked into something". Returns their control-baseline attestation, splitting what OceanAlt enforces from what they merely claim	Free
resolve_agent_identity	agentId	Chain of accountability: agent → principal → mandate → credential → wallet. Wherever it breaks is where accountability stops	Free
recent_flagged	—	Recently flagged high-risk addresses	Free
check_calldata_intent	intent, EVM: contract, data · Solana: network:"solana", transaction (base64)	Anti blind-signing: decode what the transaction really does (ERC-20 approve dressed as a payment; SPL Approve / SetAuthority / CloseAccount) and compare with the declared payment → match / mismatch / unknown (unknown ≠ safe)	Free
verify_payment_requirements	payment_required (decoded 402 JSON or raw base64), expect?	Was this x402 402 response tampered with in transit? Ed25519 check of the seller's signed requirements → ok / digest_mismatch / …	Free
evidence_bundle	address, network?	One signed bundle of everything public OceanAlt can say about an address (screening + evidence + freshness, profile signals, one-hop relations, receipt stats); witness, not plaintiff	Free
compliance_decision	to, amountUsdc?, purpose?, network?	Full gateway verdict (allow / review / decline) + evidence	$0.30
deep_trace	address (T…)	Tron multi-hop USDT taint trace (depth ≤3)	$0.20
batch_screen	addresses[] (≤25)	Batch screening	$0.10

network (for 0x addresses): ethereum · base · bsc · polygon · arbitrum · optimism · avalanche (auto-detected if omitted). Tron & Solana are auto-detected.

Output language

Human-readable fields (signals, note, advice) come back in English by default; pass lang: "zh" for Chinese. Every response also carries signal_keys — language-independent keys such as list.mixer or taint.onehop. Branch on those, not on the prose: wording changes, keys do not.

Two of these tools answer "found: false" a lot

counterparty_control_baseline and resolve_agent_identity return found: false for most parties, because publishing is voluntary. That means no information — it is not a negative signal, and an agent should never decline a payment on that basis alone. Fall back to payment_decision.

Quick start (free tools)

Add to your MCP client config (Claude Desktop, Claude Code, Cursor, …):

{
  "mcpServers": {
    "oceanalt-aml": { "command": "npx", "args": ["-y", "oceanalt-aml-mcp"] }
  }
}

The free tools need no API key and no signup.

Enabling the paid (x402) tools

The paid tools pay per call over x402 — HTTP 402 → sign one USDC authorization → 200. Add a payer wallet key to env and install the x402 peer deps:

{
  "mcpServers": {
    "oceanalt-aml": {
      "command": "npx", "args": ["-y", "oceanalt-aml-mcp"],
      "env": { "OCEANALT_PAYER_KEY": "0x<your payer wallet private key>" }
    }
  }
}

npm i @x402/core @x402/evm viem   # in the MCP's environment

⚠️ Real money — Base mainnet. The paid endpoints settle real USDC on Base mainnet (eip155:8453); the $ prices above are charged in real USDC. Always confirm the live network/pricing manifest at https://oceanalt.com/api/x402 before paying, and use a dedicated low-balance payer wallet.

🔐 Wallet safety. OCEANALT_PAYER_KEY is used only in your local process to sign one EIP-3009 authorization. It is never bundled in this package, never uploaded, never logged. The facilitator pays gas and never custodies your funds. Use a dedicated low-balance payer wallet, not your main funds.

Environment variables

Var	Purpose	Default
OCEANALT_BASE	Backend base URL	https://oceanalt.com (production)
OCEANALT_PAYER_KEY	Payer wallet key — enables the paid tools	unset (free tools only)

What it is (and isn't)

This package is a thin (~9KB) client that calls OceanAlt's public API. It contains no proprietary logic and no data — the AML engine, scoring, and address-intelligence all run server-side at oceanalt.com. Every query still enriches OceanAlt's own address-intelligence DB (it grows with use).

• Programmatic SDK (same capabilities, for Node / browser / Deno / Bun): oceanalt-aml
• API docs & examples: https://oceanalt.com/en/api-docs
• RAP — the compliance standard behind the verdicts: https://oceanalt.com/en/rap

MIT © OceanAlt

中文

让 Claude / Cursor / 任意 MCP 客户端原生调用 OceanAlt 的链上地址合规筛查 + 合规网关。给收据,不给黑箱分:每条判决都带可点开核验的证据。覆盖 7 条 EVM 链 + 波场 TRON + Solana,付款前先问一句「这个收款方安不安全」。

• 免费工具:payment_decision(付款前调一次 → allow/review/decline + 证据 + 可核验结算凭证)、screen_address(单查 + 证据)、payee_decide(收款方三态决策)、counterparty_control_baseline / resolve_agent_identity(对方的控制基线与责任链)、recent_flagged(近期被标记)、check_calldata_intent(盲签检查,EVM calldata 或整笔 Solana 交易)、verify_payment_requirements(402 应答验签)、evidence_bundle(签名证据包)。无需 key、无需注册。
• 付费三工具(x402):compliance_decision(网关判决)、deep_trace(波场深度追踪)、batch_screen(批量)。按需加载 @x402+viem,设置 OCEANALT_PAYER_KEY 才启用。
• ⚠️ 真钱:付费端点当前在 Base 主网结算,USDC 为真实资金(eip155:8453),上表 $ 价按真实 USDC 收取。付款前务必以实时清单 https://oceanalt.com/api/x402 为准,并使用小额专用付款钱包。
• 🔐 钱包安全:OCEANALT_PAYER_KEY 只在本地签一次 EIP-3009 授权,绝不随包发布/上传/打日志;facilitator 代付 gas、不托管资金。建议用小额专用钱包,别用主资金钱包私钥。
• 编程 SDK:oceanalt-aml;在线文档:https://oceanalt.com/en/api-docs;合规标准:https://oceanalt.com/en/rap。