Tollbooth X402

Overview

Tollbooth X402 is a Model Context Protocol server that gives AI agents access to 56 x402 pay-per-call finance and tax calculators. You can discover available tools, request quotes, verify calculations, and run self-checks all through MCP, letting Claude, Cursor, and other AI assistants call these calculators directly instead of switching between applications.

The server runs locally on your machine via the npm package tollbooth-x402, which communicates over stdio. Installation is straightforward with no authentication required — just run npx -y tollbooth-x402 and start using it. The latest release is v0.6.0, maintained at SolomonisBlack/tollbooth-x402 on GitHub.

Tollbooth X402 belongs in the AI & Agents category on mcp.site and works with MCP clients including Claude Desktop, Claude Code, Cursor, VS Code, Windsurf, and Zed. If you maintain this server, claim this listing to verify ownership and keep details current.

Installation

// claude_desktop_config.json
{
  "mcpServers": {
    "tollbooth_x402": {
      "command": "npx",
      "args": [
        "-y",
        "tollbooth-x402"
      ]
    }
  }
}