Preflight Checks (x402) MCP Server: Install & Setup

Install Preflight Checks (x402) in Claude Code

Claude Code

claude mcp add preflight-checks-x402 -e PREFLIGHT_BUYER_PRIVATE_KEY=... -- npx -y @joserobles/preflight-mcp

mcp.json (Claude Desktop, Cursor, VS Code, Windsurf)

{
  "mcpServers": {
    "preflight-checks-x402": {
      "command": "npx",
      "args": [
        "-y",
        "@joserobles/preflight-mcp"
      ],
      "env": {
        "PREFLIGHT_BUYER_PRIVATE_KEY": "..."
      }
    }
  }
}

Replace each ... with your own value.

Frequently asked questions

What does the Preflight Checks (x402) MCP server do?

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

Is the Preflight Checks (x402) MCP server free?

Probably not entirely. The listing mentions pay-per-call, credits or a subscription. Check the provider for current pricing.

Does Preflight Checks (x402) run locally or remotely?

Local. Runs on your machine (stdio). You install it with npx, uvx, Docker or from source.

How do I add Preflight Checks (x402) to Claude Code?

Run: claude mcp add preflight-checks-x402 -e PREFLIGHT_BUYER_PRIVATE_KEY=... -- npx -y @joserobles/preflight-mcp

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