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Preflight Checks (x402)

Official registry Security

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

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 @joserobles/preflight-mcp
Claude Code 
claude mcp add preflight-checks-x402 -e 'PREFLIGHT_BUYER_PRIVATE_KEY=<your preflight_buyer_private_key>' -e 'PREFLIGHT_BASE_URL=<PREFLIGHT_BASE_URL>' -- npx -y @joserobles/preflight-mcp@0.4.0
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "preflight-checks-x402": {
            "command": "npx",
            "args": [
                "-y",
                "@joserobles/preflight-mcp@0.4.0"
            ],
            "env": {
                "PREFLIGHT_BUYER_PRIVATE_KEY": "<your preflight_buyer_private_key>",
                "PREFLIGHT_BASE_URL": "<PREFLIGHT_BASE_URL>"
            }
        }
    }
}

Environment variables

  • 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 API base URL. Defaults to https://preflight402.com.

Frequently asked questions

What is Preflight Checks (x402)?

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

How do I install Preflight Checks (x402)?

It runs on your machine. In Claude Code: claude mcp add preflight-checks-x402 -e 'PREFLIGHT_BUYER_PRIVATE_KEY=<your preflight_buyer_private_key>' -e 'PREFLIGHT_BASE_URL=<PREFLIGHT_BASE_URL>' -- npx -y @joserobles/preflight-mcp@0.4.0. For other clients, paste the JSON configuration from this page into their MCP settings.

Does Preflight Checks (x402) need an API key?

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

Is Preflight Checks (x402) open source?

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

Who maintains Preflight Checks (x402)?

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

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.