概要
What is CalcFi MCP?
CalcFi MCP is a free, open-source server exposing 24 personal-finance and macroeconomic tools to LLM agents. It covers mortgage calculations, paycheck withholding, tax brackets, FRED data, BLS labor statistics, and more without requiring any API keys.
How to use CalcFi MCP?
Install the server via npm (npx -y calcfi-mcp-server) or pip (pip install calcfi-mcp), then add the configuration to any MCP client (Claude Desktop, Cursor, Cline, etc.). The server uses stdio transport.
Key features of CalcFi MCP
- 24 deterministic calculators across personal finance and macro data
- No API keys, no signup, MIT licensed
- Source-cited outputs (IRS, Fed, BLS, Treasury, Census, HUD, Freddie Mac)
- Live FRED, BLS, mortgage rate, and Treasury yield data
- Tools run in code, not LLM‑predicted
Use cases of CalcFi MCP
- Calculate mortgage payments and amortization schedules with current rates
- Estimate take‑home pay including federal and state withholding
- Look up FRED economic series or BLS labor statistics
- Plan retirement savings with Monte Carlo simulations
- Compare debt payoff strategies (snowball vs. avalanche)
FAQ from CalcFi MCP
Does CalcFi MCP require an API key?
No. All tools are free and work without any API keys or signup. The server uses public financial data updated daily.
What data sources power the calculations?
Every tool references primary sources: IRS publications, Federal Reserve Economic Data (FRED), BLS tables, Treasury yield curves, Census ACS, HUD FMR, and Freddie Mac PMMS.
How is CalcFi MCP different from an LLM answering financial questions?
All calculations are deterministic and run in code, not predicted by the model. Outputs include the specific source reference, eliminating hallucinated tax brackets or mortgage rates.
What transport does CalcFi MCP use?
The server communicates over stdio transport, making it compatible with any MCP client that supports stdin/stdout.
Is CalcFi MCP free to use?
Yes, it is completely free and open source under the MIT license. No paid tiers or usage limits are mentioned.
