propublica-npo-mcp

MCP server exposing the ProPublica Nonprofit Explorer API with curated nonprofit and filing summaries.

Install

npm install

Related MCP server: Charity MCP Server

Run

npm run start

For local development:

npm run dev

Claude Desktop / Cline config

{
  "mcpServers": {
    "propublica-npo": {
      "command": "npx",
      "args": ["tsx", "/absolute/path/to/propublica-npo-mcp/src/index.ts"]
    }
  }
}

Tools

search_nonprofits searches the ProPublica Nonprofit Explorer index by name or keyword, with optional state, NTEE major category, 501(c) subtype, and page filters.

get_organization returns organization metadata plus a curated summary of up to five most recent filings by default. Pass verbose: true to get the raw upstream payload.

list_organization_filings returns all filings for an EIN, newest first. The default output is curated; verbose: true returns the raw filing arrays.

compare_nonprofits compares 2-5 organizations side by side using their latest filing with data, while preserving per-EIN 404s as row-level errors.

Notes

The server uses a 100-entry in-memory LRU cache with a 1-hour TTL. Each upstream request has a 15-second timeout and retries once on network or 5xx failures. ProPublica is public but still rate-limited; if you hit a 429, wait and retry rather than looping.

Support

If this project helps you research nonprofits or build cool agents, consider buying me a coffee! It helps keep the updates coming.

https://paypal.me/2b3/5

License

MIT License - Created by Ian Shen.