Server data from the Official MCP Registry
Discover, quote, verify & self-check 56 x402 pay-per-call finance/tax calculators for AI agents.
About
Discover, quote, verify & self-check 56 x402 pay-per-call finance/tax calculators for AI agents.
Security Report
Valid MCP server (2 strong, 3 medium validity signals). No known CVEs in dependencies. Package registry verified. Imported from the Official MCP Registry.
3 files analyzed · 1 issue found
Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.
Permissions Required
This plugin requests these system permissions. Most are normal for its category.
How to Install
Add this to your MCP configuration file:
{
"mcpServers": {
"io-github-solomonisblack-tollbooth-x402": {
"args": [
"-y",
"tollbooth-x402"
],
"command": "npx"
}
}
}Documentation
View on GitHubFrom the project's GitHub README.
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.
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