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Home/Servers/Tollbooth X402

Tollbooth X402

by io.github.SolomonisBlack

Discover, quote, verify & self-check 56 x402 pay-per-call finance/tax calculators for AI agents.

Power your agent

Add this server

The publisher's own command. Not a PlugMCP endpoint.

Local command
npx -y [email protected]
Provider
Claude Code
claude mcp add io.github.solomonisblack-tollbooth-x402 -- npx -y [email protected]

Run in a terminal.

Claude Desktop
{
  "mcpServers": {
    "io.github.solomonisblack-tollbooth-x402": {
      "command": "npx",
      "args": [
        "-y",
        "[email protected]"
      ]
    }
  }
}

claude_desktop_config.json

Step-by-step: add this in Claude

Remote URL or a command on your machine? How the two installs differ

Run on PlugMCP

Host a copy with our keys and logs.

A new server you create. It is not this listing's official endpoint. Use the publisher install when you want their URL and their credentials.

Launch

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Questions

How do I install Tollbooth X402?
Copy the stdio config for Cursor, Claude Desktop, Claude Code, or VS Code on this page. It uses the publisher's install, not a PlugMCP proxy.
Does Tollbooth X402 need an API key?
No required environment variable is listed on this record.
What transport does Tollbooth X402 use?
Tollbooth X402 runs locally over stdio.
When was Tollbooth X402 last checked?
Last checked 2026-10-16. Discover, quote, verify & self-check 56 x402 pay-per-call finance/tax calculators for AI agents.

Discover, quote, verify & self-check 56 x402 pay-per-call finance/tax calculators for AI agents.

tollbooth-x402

Free MCP server for x402toll.com — a toll plaza of verified, pay-per-call calculators for AI agents. Discover the catalog, run free coarse previews, verify any paid response's provenance hash, and learn how to pay. The paid endpoints charge a few cents of USDC per call over the x402 protocol on Base — no account, no API key.

Why agents pay: the answers depend on exact 2026 data (tax brackets, contribution limits, state fees) a model can't reliably know, every answer is checked against hand-verified reference values, and each ships with a formula trace and a reproducible SHA-256 hash.

Install

npx -y tollbooth-x402

Add to an MCP client (e.g. Claude Desktop / Cursor):

{
  "mcpServers": {
    "tollbooth": { "command": "npx", "args": ["-y", "tollbooth-x402"] }
  }
}

Tools (all free, no wallet)

  • tollbooth_catalog — every endpoint with prices, input schemas, methods, and golden-vector evidence.
  • tollbooth_preview — a free rounded preview of a tool (paycheck, self-employment tax, capital gains, mortgage affordability, LLC cost, debt plan, impermanent loss).
  • tollbooth_verify_hash — re-derive a paid response's hash to confirm it wasn't altered.
  • tollbooth_how_to_pay — the x402 payment flow for the paid endpoints.

Paid calls are made directly against https://x402toll.com by an x402-capable wallet/client. Set TOLLBOOTH_URL to point at a different gateway.

Categories

Tax & payroll · Crypto & DeFi · Lending · Real estate · Retirement · Business.

MIT licensed. Estimates only — not financial, legal, or tax advice.

How do I install Tollbooth X402?
Copy the stdio config for Cursor, Claude Desktop, Claude Code, or VS Code on this page. It uses the publisher's install, not a PlugMCP proxy.
Does Tollbooth X402 need an API key?
No required environment variable is listed on this record.
What transport does Tollbooth X402 use?
Tollbooth X402 runs locally over stdio.
When was Tollbooth X402 last checked?
Last checked 2026-10-16. Discover, quote, verify & self-check 56 x402 pay-per-call finance/tax calculators for AI agents.

No tool list yet. Remote servers get one after the first health check.

plugmcp

Plug any tool into any agent. MCP servers for people who do not write servers. Gateway for volume, n8n for apps.

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