x402 Notary MCP Server

by forgemeshlabsio.github.forgemeshlabs/x402-notary-mcpv0.1.10

Notarize AI model outputs with signed Ed25519 attestations, SHA-256 content hashes and Merkle anchoring on Base or Solana, paid via x402.

0Node.jsstdioofficial registry

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Active2d ago

Install x402 Notary MCP server

claude mcp add x402-notary -e WALLET_PRIVATE_KEY='<wallet-private-key>' -- npx -y @forgemeshlabs/x402-notary-mcp

{
  "mcpServers": {
    "x402-notary": {
      "command": "npx",
      "args": [
        "-y",
        "@forgemeshlabs/x402-notary-mcp"
      ],
      "env": {
        "WALLET_PRIVATE_KEY": "<wallet-private-key>"
      }
    }
  }
}

Add to ~/.cursor/mcp.json (global) or .cursor/mcp.json (project).

{
  "mcpServers": {
    "x402-notary": {
      "command": "npx",
      "args": [
        "-y",
        "@forgemeshlabs/x402-notary-mcp"
      ],
      "env": {
        "WALLET_PRIVATE_KEY": "<wallet-private-key>"
      }
    }
  }
}

Settings → Developer → Edit Config (claude_desktop_config.json), then restart.

{
  "servers": {
    "x402-notary": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@forgemeshlabs/x402-notary-mcp"
      ],
      "env": {
        "WALLET_PRIVATE_KEY": "<wallet-private-key>"
      }
    }
  }
}

Add to .vscode/mcp.json in your workspace.

{
  "mcpServers": {
    "x402-notary": {
      "command": "npx",
      "args": [
        "-y",
        "@forgemeshlabs/x402-notary-mcp"
      ],
      "env": {
        "WALLET_PRIVATE_KEY": "<wallet-private-key>"
      }
    }
  }
}

Add to ~/.codeium/windsurf/mcp_config.json.

Configuration

Variable	Required	Secret	Description
WALLET_PRIVATE_KEY	—	yes	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.

Freshness

Active — last maintenance signal 2d ago. The newest of the signals below sets the band.

Last commit (default branch)
2026-10-08 · 2d ago · GitHub
Latest release
2026-10-08 · 2d ago · GitHub · v0.1.10
Package published
no data · npm/PyPI
Registry entry updated
2026-10-08 · 2d ago · official registry · v0.1.10

FAQ

›How do I install the x402 Notary MCP server in Claude Code?

Run: claude mcp add x402-notary -e WALLET_PRIVATE_KEY='<wallet-private-key>' -- npx -y @forgemeshlabs/x402-notary-mcp. For Cursor, VS Code, Claude Desktop and Windsurf, use the install tabs above.

›Does x402 Notary require an API key?

Yes. It expects WALLET_PRIVATE_KEY, of which 1 is a secret.

›Can I use x402 Notary as a remote (hosted) MCP server?

No hosted endpoint is published; it runs locally over stdio.

›Is x402 Notary in the official MCP registry?

Yes, as io.github.forgemeshlabs/x402-notary-mcp.