facts402: x402 API finder + fact checks

com.facts402/facts402-mcp · v0.1.1

Find the right paid x402 API, plus fact checks: IBAN, EU VAT, OFAC sanctions, LEI, FX

Website Source code Set it up

Connect Runs on your machine

Terminal

claude mcp add facts402-mcp -e X402_PRIVATE_KEY=<X402_PRIVATE_KEY> -e X402_MAX_PER_CALL_USD=<X402_MAX_PER_CALL_USD> -e X402_SESSION_BUDGET_USD=<X402_SESSION_BUDGET_USD> -- uvx facts402-mcp==0.1.1

claude_desktop_config.json

{
  "mcpServers": {
    "facts402-mcp": {
      "command": "uvx",
      "args": [
        "facts402-mcp==0.1.1"
      ],
      "env": {
        "X402_PRIVATE_KEY": "<X402_PRIVATE_KEY>",
        "X402_MAX_PER_CALL_USD": "<X402_MAX_PER_CALL_USD>",
        "X402_SESSION_BUDGET_USD": "<X402_SESSION_BUDGET_USD>"
      }
    }
  }
}

~/.cursor/mcp.json

{
  "mcpServers": {
    "facts402-mcp": {
      "command": "uvx",
      "args": [
        "facts402-mcp==0.1.1"
      ],
      "env": {
        "X402_PRIVATE_KEY": "<X402_PRIVATE_KEY>",
        "X402_MAX_PER_CALL_USD": "<X402_MAX_PER_CALL_USD>",
        "X402_SESSION_BUDGET_USD": "<X402_SESSION_BUDGET_USD>"
      }
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "facts402-mcp": {
      "type": "stdio",
      "command": "uvx",
      "args": [
        "facts402-mcp==0.1.1"
      ],
      "env": {
        "X402_PRIVATE_KEY": "<X402_PRIVATE_KEY>",
        "X402_MAX_PER_CALL_USD": "<X402_MAX_PER_CALL_USD>",
        "X402_SESSION_BUDGET_USD": "<X402_SESSION_BUDGET_USD>"
      }
    }
  }
}

Replace the values in angle brackets with your own. Keys stay on your machine; we never see them.

Tools

This server runs locally, so its tools are listed by your MCP client once it starts.

Environment variables

Name	Description
`X402_PRIVATE_KEY` Optional, secret	Private key of your own Base mainnet wallet holding a little USDC. Optional: without it only the free tools work.
`X402_MAX_PER_CALL_USD` Optional	Most a single tool call may pay, in USD
`X402_SESSION_BUDGET_USD` Optional	Most the server may spend until it restarts, in USD

Details

Package	`[email protected]` (PYPI, stdio)
First published	1 Nov 2026
Last updated	1 Nov 2026
Registry name	`com.facts402/facts402-mcp`

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Live status

Local install

Installed and run on your own machine, so there is no public endpoint to check.

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