An MCP server for Solana Watchdog and EVM Watchdog. It gives an agent the security checks it needs at the moment it decides: before signing for a program, before approving a contract, before adding a dependency. Each paid call costs cents in USDC and is paid automatically over x402, from a wallet you provide, within limits you set.

Results are checks, not audits.

Tools

Tool	Use it	Price
`solana_program_authority`	before signing for a Solana program: who can replace its code (single key, Squads multisig with threshold and time lock, DAO, immutable), last deploy, verified build, security.txt	$0.05 (Solana)
`evm_contract_control`	before approving or depositing on Base / Robinhood Chain: proxy kind, live implementation, who controls upgrades and ownership (key, Safe, timelock), Sourcify verification	$0.05 (Base)
`dependency_advisories`	before adding a dependency: advisories for a `Cargo.lock`, `package-lock.json` or `yarn.lock` on disk, or a package list	$0.01
`scan_repo`	before a release: a full scan of a public GitHub repo (Rust/Anchor or Solidity)	$0.50
`get_scan_report`	status and report of a scan	free
`watch_create`	to be alerted for 30 days when a program, contract or lockfile changes, by signed webhook	$0.90
`watch_status`	events of a watch, or cancel it	free
`watchdog_wallet`	which wallets are set, caps, what was spent	free

An address that holds no program or contract is not charged. A dependency check is settled only once its answer exists.

Install

Claude Code:

claude mcp add watchdog \
  -e WATCHDOG_SOLANA_PRIVATE_KEY=<base58 key of a Solana wallet holding a little USDC> \
  -e WATCHDOG_EVM_PRIVATE_KEY=<hex key of a Base wallet holding a little USDC> \
  -- npx -y watchdog-mcp

Claude Desktop, Cursor and other clients (mcpServers JSON):

{
  "mcpServers": {
    "watchdog": {
      "command": "npx",
      "args": ["-y", "watchdog-mcp"],
      "env": {
        "WATCHDOG_SOLANA_PRIVATE_KEY": "…",
        "WATCHDOG_EVM_PRIVATE_KEY": "…",
        "WATCHDOG_BUDGET_USD": "5"
      }
    }
  }
}

From a clone of this repository, scripts/add-to-claude-code.sh does the Claude Code step for you: it reads the Solana key from the clipboard, checks it without printing it, and registers the server.

Both keys are optional. Without a key for a chain, its tools return the price and how to pay instead of an answer.

Use a dedicated wallet that holds only what you are willing to spend on checks. No SOL or ETH is needed: the x402 facilitator pays the network fee.

Configuration

Variable	Default
`WATCHDOG_SOLANA_PRIVATE_KEY`	none	Solana wallet, base58 (as Phantom exports it)
`WATCHDOG_EVM_PRIVATE_KEY`	none	Base wallet, hex
`WATCHDOG_MAX_PER_CALL_USD`	`1`	refuse any single payment above this
`WATCHDOG_BUDGET_USD`	`5`	refuse payments beyond this total, per server process
`WATCHDOG_SOLANA_RPC_URL`	public mainnet	RPC used to build Solana payments

What protects your wallet

Every payment is screened before anything is signed:

it must go to the Watchdog merchant wallet of that service, in USDC, on the expected network. A server that asked to be paid elsewhere would be refused;
it must fit under the per-call cap and the remaining session budget;
scan and watch access tokens are only ever sent back to the Watchdog that issued them.

Keys never appear in tool output or errors, including when a key is malformed or of the wrong chain.