X402 MCP Server: Install & Setup

Install X402 in Claude Code

Claude Code

claude mcp add jannis-e-x402 -e BASE_PRIVATE_KEY=... -- npx -y x402-mcp-server_by_milza

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

{
  "mcpServers": {
    "jannis-e-x402": {
      "command": "npx",
      "args": [
        "-y",
        "x402-mcp-server_by_milza"
      ],
      "env": {
        "BASE_PRIVATE_KEY": "..."
      }
    }
  }
}

Replace each ... with your own value.

Frequently asked questions

What does the X402 MCP server do?

Pay-per-call x402 tools on Base: web extract/render, burn-once secret vault, chart, GeoTIFF

Is the X402 MCP server free?

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

Does 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 X402 to Claude Code?

Run: claude mcp add jannis-e-x402 -e BASE_PRIVATE_KEY=... -- npx -y x402-mcp-server_by_milza

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