US Money HQ

Developers: give AI agents 99 finance calculators

Every calculator on US Money HQ is computable by machines — MCP tools, llms.txt discovery, and a CORS-open REST API. Free, no API key.

1. MCP Server (for AI agents)

Connect Claude Desktop, Cursor, or any MCP-aware agent to https://usmoneyhq.com/api/mcp — all 99 calculators appear as native tools.

"mcpServers": {
  "usmoneyhq": {
    "url": "https://usmoneyhq.com/api/mcp"
  }
}

Try it:

curl -s -X POST https://usmoneyhq.com/api/mcp \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/list"}'

Then call any tool: tools/call with {"name":"mortgage-calculator","arguments":{"amount":300000,"rate":6.5,"years":30}}

2. llms.txt (for agent discovery)

https://usmoneyhq.com/llms.txt follows the llmstxt.org standard so browsing agents can find and cite our tools.

3. REST API (for apps)

Every calculator has a JSON endpoint — no key, CORS-open for any origin:

# Schema
GET  https://usmoneyhq.com/api/calc/mortgage-calculator

# Compute
POST https://usmoneyhq.com/api/calc/mortgage-calculator
{"amount": 300000, "rate": 6.5, "years": 30}

Full tool list: all 99 calculators.

Data provenance

Every result is computed server-side from the same engine as the interactive pages, using current federal and state tax tables. See Methodology & Data Sources.

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