{
  "markdown": "# tollbooth-x402\n\nFree **MCP server** for [x402toll.com](https://x402toll.com) — a toll plaza of **verified,\npay-per-call calculators for AI agents**. Discover the catalog, run free coarse previews, verify any\npaid response's provenance hash, and learn how to pay. The paid endpoints charge a few cents of USDC\nper call over the **x402** protocol on Base — no account, no API key.\n\nWhy agents pay: the answers depend on exact **2026** data (tax brackets, contribution limits, state\nfees) a model can't reliably know, every answer is checked against hand-verified reference values,\nand each ships with a formula trace and a reproducible SHA-256 hash.\n\n## Install\n\n```bash\nnpx -y tollbooth-x402\n```\n\nAdd to an MCP client (e.g. Claude Desktop / Cursor):\n\n```json\n{\n  \"mcpServers\": {\n    \"tollbooth\": { \"command\": \"npx\", \"args\": [\"-y\", \"tollbooth-x402\"] }\n  }\n}\n```\n\n## Tools (all free, no wallet)\n\n- **`tollbooth_catalog`** — every endpoint with prices, input schemas, methods, and golden-vector evidence.\n- **`tollbooth_preview`** — a free rounded preview of a tool (paycheck, self-employment tax, capital gains, mortgage affordability, LLC cost, debt plan, impermanent loss).\n- **`tollbooth_verify_hash`** — re-derive a paid response's hash to confirm it wasn't altered.\n- **`tollbooth_how_to_pay`** — the x402 payment flow for the paid endpoints.\n\nPaid calls are made directly against `https://x402toll.com` by an x402-capable wallet/client. Set\n`TOLLBOOTH_URL` to point at a different gateway.\n\n## Categories\n\nTax & payroll · Crypto & DeFi · Lending · Real estate · Retirement · Business.\n\nMIT licensed. Estimates only — not financial, legal, or tax advice.\n",
  "bytes": 1659,
  "sha": "e33b7235b47c28ae7b6c105d6b3fda11df3179d5d2bb67eb013335bceca05e09",
  "repo_slug": "solomonisblack/tollbooth-x402",
  "fonte": "repo",
  "truncated": false,
  "api": "https://agentalog.com/api/listings/mcp_io_github_solomonisblack_tollbooth_x402_35775999/readme"
}