Power your agent
The publisher's own command. Not a PlugMCP endpoint.
Host a copy with our keys and logs.
npx -y [email protected]Claude Code has no install link for a local command. Copy the command below and run it in a terminal.
claude mcp add io.github.solomonisblack-tollbooth-x402 -- npx -y tollbooth-x402@0.6.0Run in a terminal.
{ "mcpServers": { "io.github.solomonisblack-tollbooth-x402": { "command": "npx", "args": [ "-y", "[email protected]" ] } }}claude_desktop_config.json
Remote URL or a command on your machine? How the two installs differ
Run on PlugMCP
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.
LaunchFrom the publisher
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.
Discover, quote, verify & self-check 56 x402 pay-per-call finance/tax calculators for AI agents.
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.
npx -y tollbooth-x402
Add to an MCP client (e.g. Claude Desktop / Cursor):
{
"mcpServers": {
"tollbooth": { "command": "npx", "args": ["-y", "tollbooth-x402"] }
}
}
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.
Tax & payroll · Crypto & DeFi · Lending · Real estate · Retirement · Business.
MIT licensed. Estimates only — not financial, legal, or tax advice.
© 2026 MCP Directory.
Discover, quote, verify & self-check 56 x402 pay-per-call finance/tax calculators for AI agents.
{ "mcpServers": { "io.github.solomonisblack-tollbooth-x402": { "command": "npx", "args": [ "-y", "[email protected]" ] } }}Tools
No tool list yet. Remote servers get one after the first health check.
FAQ
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.
No required environment variable is listed on this record.
Tollbooth X402 runs locally over stdio.
Last checked 2026-11-09. Discover, quote, verify & self-check 56 x402 pay-per-call finance/tax calculators for AI agents.