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x402 Notary MCP

Official registry Finance and payments

Cryptographic receipts for AI outputs on Base or Solana via x402.

Source code Website

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

NPM package @forgemeshlabs/x402-notary-mcp
Claude Code 
claude mcp add x402-notary-mcp -e 'WALLET_PRIVATE_KEY=<your wallet_private_key>' -e 'NOTARY_RAIL=<NOTARY_RAIL>' -- npx -y @forgemeshlabs/x402-notary-mcp@0.1.10
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "x402-notary-mcp": {
            "command": "npx",
            "args": [
                "-y",
                "@forgemeshlabs/x402-notary-mcp@0.1.10"
            ],
            "env": {
                "WALLET_PRIVATE_KEY": "<your wallet_private_key>",
                "NOTARY_RAIL": "<NOTARY_RAIL>"
            }
        }
    }
}

Environment variables

  • WALLET_PRIVATE_KEY secret Dedicated low-balance Base wallet private key for x402 USDC micropayments. Optional — verification tools work without it. Never use your primary wallet.
  • NOTARY_RAIL Payment rail: base or solana. Defaults to base, or solana when NOTARY_BASE_URL contains notary-solana.

Frequently asked questions

What is x402 Notary MCP?

Cryptographic receipts for AI outputs on Base or Solana via x402.

How do I install x402 Notary MCP?

It runs on your machine. In Claude Code: claude mcp add x402-notary-mcp -e 'WALLET_PRIVATE_KEY=<your wallet_private_key>' -e 'NOTARY_RAIL=<NOTARY_RAIL>' -- npx -y @forgemeshlabs/x402-notary-mcp@0.1.10. For other clients, paste the JSON configuration from this page into their MCP settings.

Does x402 Notary MCP need an API key?

Yes. It expects WALLET_PRIVATE_KEY, which you set in its configuration.

Is x402 Notary MCP open source?

Its code is public on GitHub, but the repository does not declare a standard license.

Who maintains x402 Notary MCP?

It is published by forgemeshlabs. AI.tn lists it but does not maintain or endorse it.

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