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Preflight Checks (x402)

io.github.josediegorobles/preflight-checks ยท v0.4.1

Deterministic pre-execution verification tools for AI agents with x402 USDC pay-per-call on Base

Website Source code Set it up

Connect Runs on your machine

Terminal
claude mcp add preflight-checks -e PREFLIGHT_BUYER_PRIVATE_KEY=<PREFLIGHT_BUYER_PRIVATE_KEY> -e PREFLIGHT_BASE_URL=<PREFLIGHT_BASE_URL> -- npx -y @joserobles/[email protected]
claude_desktop_config.json
{
  "mcpServers": {
    "preflight-checks": {
      "command": "npx",
      "args": [
        "-y",
        "@joserobles/[email protected]"
      ],
      "env": {
        "PREFLIGHT_BUYER_PRIVATE_KEY": "<PREFLIGHT_BUYER_PRIVATE_KEY>",
        "PREFLIGHT_BASE_URL": "<PREFLIGHT_BASE_URL>"
      }
    }
  }
}
~/.cursor/mcp.json
{
  "mcpServers": {
    "preflight-checks": {
      "command": "npx",
      "args": [
        "-y",
        "@joserobles/[email protected]"
      ],
      "env": {
        "PREFLIGHT_BUYER_PRIVATE_KEY": "<PREFLIGHT_BUYER_PRIVATE_KEY>",
        "PREFLIGHT_BASE_URL": "<PREFLIGHT_BASE_URL>"
      }
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "preflight-checks": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@joserobles/[email protected]"
      ],
      "env": {
        "PREFLIGHT_BUYER_PRIVATE_KEY": "<PREFLIGHT_BUYER_PRIVATE_KEY>",
        "PREFLIGHT_BASE_URL": "<PREFLIGHT_BASE_URL>"
      }
    }
  }
}

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

NameDescription
PREFLIGHT_BUYER_PRIVATE_KEY
Required, secret		Private key of a Base wallet holding USDC, used to pay each call via x402 (0.05 USDC per check).
PREFLIGHT_BASE_URL
Optional		API base URL. Defaults to https://preflight402.com.

Details

Package@joserobles/[email protected] (NPM, stdio)
First published16 Oct 2026
Last updated16 Oct 2026
Registry nameio.github.josediegorobles/preflight-checks

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