watchdog-mcp
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
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
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.
License
MIT