Connects Claude to ProPublica's Nonprofit Explorer API for IRS Form 990 data on 1.8 million U.S. tax-exempt organizations. Three tools: search by name or location with state and NTEE filters, fetch full org profiles with financials from the latest 990, and pull complete filing histories with year-by-year revenue, expenses, and program-expense ratios. No API key needed. Returns EINs, ruling dates, executive compensation summaries, and direct links to source PDFs and XML. Useful for grant research, due diligence, or any workflow that needs verified nonprofit financials. Data lags one to two years behind current filings. Built on the mcp-ts-core framework with stdio and streamable HTTP transports.
claude mcp add --transport stdio cyanheads-nonprofit-explorer-mcp-server uvx nonprofit-explorer-mcp-server