X402 Extract

Overview

X402 Extract is a Model Context Protocol (MCP) server: Pay-per-call MCP server. $0.01 USDC extracts schema.org/Product JSON from any URL via x402. In practice that means any MCP-compatible AI assistant can call X402 Extract's tools directly — the model decides when to use them in a conversation or agent run.

It runs locally: the npm package x402-extract-mcp speaks MCP over stdio on your machine. Configuration happens through environment variables — you'll need BUYER_PRIVATE_KEY. The current release is v0.1.2, with source at UltraStarz/x402-extract-mcp on GitHub.

X402 Extract is listed under Development on mcp.site and works with any MCP client — Claude Desktop, Claude Code, Cursor, VS Code, Windsurf, Zed and the rest of the ecosystem — using the install snippets below. If you maintain X402 Extract for UltraStarz, claim this listing to verify ownership, earn the Verified badge, and keep the details current.

Installation

// claude_desktop_config.json
{
  "mcpServers": {
    "x402_extract": {
      "command": "npx",
      "args": [
        "-y",
        "x402-extract-mcp"
      ],
      "env": {
        "BUYER_PRIVATE_KEY": "<buyer-private-key>"
      }
    }
  }
}

Requires BUYER_PRIVATE_KEY