Nonprofit Explorer Mcp Server

cyanheads/nonprofit-explorer-mcp-server

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.

GitHub stars: 2
tools: 3
transport: STDIO, HTTP
env vars: 7
last updated: Nov 3, 2026

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Install

From registry metadata

$ npx add-mcp https://nonprofit-explorer.caseyjhand.com/mcp --name nonprofit-explorer

Run in your terminal. add-mcp asks which agents to add it to (Claude Code, Codex, Cursor and more). Add -g to install it for every project.

Review the command, arguments and environment values before installing. MCP servers run with your local permissions.

Other ways

Claude Code

$ claude mcp add --transport http nonprofit-explorer https://nonprofit-explorer.caseyjhand.com/mcp

Run in your terminal. Add --scope user to make it available in every project.

Tools

Verified live · 3 tools

Verified live against the running server on Nov 6, 2026.

nonprofit_search_organizationsSearch 1.8M+ IRS-recognized tax-exempt organizations by name, keyword, city, or phrase. Optionally narrow by US state, NTEE major sector (1–10), or 501(c) subsection type. Returns EINs — pass them to nonprofit_get_organization or nonprofit_get_filings for details. Results are...5 params

Search 1.8M+ IRS-recognized tax-exempt organizations by name, keyword, city, or phrase. Optionally narrow by US state, NTEE major sector (1–10), or 501(c) subsection type. Returns EINs — pass them to nonprofit_get_organization or nonprofit_get_filings for details. Results are...

Parameters* required

ntee_categorystring

NTEE major group digit string (1–10) or case-insensitive major letter: A→1 Arts/Culture/Humanities, B→2 Education, C–D→3 Environment/Animals, E–H→4 Health, I–P→5 Human Services, Q→6 International/F...one of 1 · 2 · 3 · 4 · 5 · 6

pageinteger

Zero-indexed page number. 25 results per page. Total pages is in num_pages. Increment to paginate large result sets.default: 0

query*string

Keyword search string. Searched against org name, the secondary name line, and city in order of relevance. Supports: quoted phrases ("Red Cross"), required terms (+evanston), excluded terms (-denta...

statestring

US state or territory name (e.g., "Washington", "Puerto Rico") or two-letter state, territory, or military postal code. Trimmed and case-insensitive; normalized to a postal code before filtering. U...

subsection_codestring

501(c) subsection code. "3" = charitable/religious/educational organization (most common — includes both public charities and private foundations; nonprofit_get_organization returns foundation_type...one of 2 · 3 · 4 · 5 · 6 · 7

nonprofit_get_organizationFull profile for a tax-exempt org by EIN: legal identity, IRS classification and BMF filing requirements, latest extracted financial snapshot, and latest return metadata across extracted and PDF-only histories. Use nonprofit_search_organizations first to resolve a name to an E...1 params

Full profile for a tax-exempt org by EIN: legal identity, IRS classification and BMF filing requirements, latest extracted financial snapshot, and latest return metadata across extracted and PDF-only histories. Use nonprofit_search_organizations first to resolve a name to an E...

Parameters* required

ein*value

Employer Identification Number. Accepts integer (530196605) or string with optional hyphen ("53-0196605"). Obtain from nonprofit_search_organizations results.

nonprofit_get_filingsForm 990 history by EIN with extracted financials, form-specific compensation, and PDF-only returns. Optional inclusive from_year/to_year bounds select fiscal years across both histories; omitted bounds return full history. Unfiltered totals remain available. Records are sorte...3 params

Form 990 history by EIN with extracted financials, form-specific compensation, and PDF-only returns. Optional inclusive from_year/to_year bounds select fiscal years across both histories; omitted bounds return full history. Unfiltered totals remain available. Records are sorte...

Parameters* required

ein*value

Employer Identification Number. Use nonprofit_search_organizations to resolve an org name to its EIN.

from_yearinteger

Inclusive minimum fiscal year (tax_prd_yr). Omit for no lower bound.

to_yearinteger

Inclusive maximum fiscal year (tax_prd_yr). Omit for no upper bound.