Nonprofit Explorer MCP Server

@cyanheads/nonprofit-explorer-mcp-server Search and explore 1.8M+ US nonprofits, fetch Form 990 financials, and access IRS filing history via MCP. STDIO or Streamable HTTP. Its 4 documented tools cluster into nonprofit, per.

People who work with irs 990, nonprofit and philanthropy and want it reachable from Claude, Cursor, VS Code, or another MCP client. The project is written in TypeScript.

VERIFIED ACTIVE

LAST COMMIT 2026-08-25 · ★ 2 · #109 OF 318 MAINTAINED FINANCE · VERIFIED 2026-09-18

Apache-2.0 · TypeScript servers · how we verify → /methodology

01 · Install Nonprofit Explorer MCP Server

before you install - you'll need

Set MCP_TRANSPORT_TYPE, MCP_LOG_LEVEL before connecting.

Claude Code

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

Claude Desktop / Cursor / VS Code - add to config

{
  "mcpServers": {
    "cyanheads-nonprofit-explorer-mcp-server": {
      "url": "https://nonprofit-explorer.caseyjhand.com/mcp"
    }
  }
}

Same JSON for Cursor. For VS Code, rename the top-level key from `mcpServers` to `servers`.

Using another client? Same JSON, different key

Claude Desktop · mcpServers

Cursor · mcpServers

VS Code · servers

Windsurf · mcpServers

Zed · context_servers

Cline · mcpServers

Roo Code · mcpServers

Continue · mcpServers

LibreChat · mcpServers

Gemini CLI · mcpServers

Codex CLI · mcp_servers

Full setup guides: every client.

02 · Evidence

https://nonprofit-explorer.caseyjhand.com/mcp

transport: streamable-http

endpoint alive - responded to MCP initialize · probed 2026-09-17

Security posture

What to check before giving this server access to your agent - from the registry, GitHub, and our own probes. We don't score safety; we show what's verifiable.

runs as local process (stdio) - runs on your machine with your user's permissions · remote - your agent's requests go to nonprofit-explorer.caseyjhand.com

endpoint auth accepted our unauthenticated MCP initialize - no credentials needed to connect

license Apache-2.0 - declared in the repository

npm package @cyanheads/nonprofit-explorer-mcp-server - published under the repo owner's npm scope (@cyanheads)

registry namespace io.github.cyanheads is GitHub-verified and matches the repo owner

03 · What Nonprofit Explorer MCP Server can do

Prose above is summarized from the project's README and registry record - no invented capabilities.

What you can build

An agent gets 4 documented tools across nonprofit, per, including nonprofit_search, nonprofit_get_organization, nonprofit_get_filings, Per-filing.

Capability map

Tools grouped from the project's README - what Nonprofit Explorer MCP Server lets an agent do.

Nonprofit

3 tools - e.g. Search 1.8M+ IRS-recognized tax-exempt organizations by name, keyword, city, or phrase with optional state, NTEE sector, and 501(c) filters; Full profile for one org by EIN: legal identity, IRS…

nonprofit_search · nonprofit_get_organization · nonprofit_get_filings

Per

1 tool - e.g. revenue, expenses, assets, liabilities, net assets, revenue breakdown (contributions, program service, investment income)

Per-filing

Latest releases

v0.1.8 · 2026-08-25

mcp-ts-core 0.12.3 / MCP SDK v2 adoption · An unrecognized argument key is rejected by name instead of silently dropped, and every tool's outputSchema now declares the error envelope · HTTP endpoints serve protocol…

v0.1.7 · 2026-08-13

Non-nullable filing exec comp, single-line tool descriptions · Narrows nonprofit_get_filings's executive_compensation to a non-nullable, tightly-typed shape - form_type/field_name now match what the code emits (#12)…

v0.1.6 · 2026-08-13

Output accuracy and null-field rendering across all three tools · Adds IRS Business Master File classification (deductible, exempt_status, foundation_type, bmf_tax_period) to nonprofit_get_organization, decoded from…

04 · Who maintains Nonprofit Explorer MCP Server

nonprofit-explorer-mcp-server is maintained by cyanheads. We track 125 MCP servers from cyanheads - 119 actively maintained, 1,816 combined GitHub stars, oldest repo from Dec 2024. Full record: all servers from cyanheads.

05 · Facts

repository: github.com/cyanheads/nonprofit-explorer-mcp-server
category: finance - ranked #109 of 318 actively-maintained finance servers as of 2026-09-18.
release cadence: 5 releases in the last 90 days (latest 2026-08-25)
registry: io.github.cyanheads/nonprofit-explorer-mcp-server (active, first published 2026-06-01 · 8 versions)
packages: npm:@cyanheads/nonprofit-explorer-mcp-server · npm:@cyanheads/nonprofit-explorer-mcp-server

06 · Nonprofit Explorer MCP Server FAQ

Is Nonprofit Explorer MCP Server still maintained?

Yes - as of 2026-09-18, its last commit was 2026-08-25 and it shipped 5 releases in the last 90 days. We re-verify nightly.

What can Nonprofit Explorer MCP Server do?

An agent gets 4 documented tools across nonprofit, per, including nonprofit_search, nonprofit_get_organization, nonprofit_get_filings, Per-filing.

How do I install Nonprofit Explorer MCP Server?

Run `npx -y @cyanheads/nonprofit-explorer-mcp-server`. The README documents 2 environment variables (MCP_TRANSPORT_TYPE, MCP_LOG_LEVEL) to set first. Set MCP_TRANSPORT_TYPE, MCP_LOG_LEVEL before connecting. You can also paste the ready-made client config above.

Does Nonprofit Explorer MCP Server require authentication?

No - the endpoint accepted our unauthenticated MCP initialize when probed on 2026-09-17; you can connect without credentials.

07 · Alternatives to Nonprofit Explorer MCP Server

Alternatives to Nonprofit Explorer MCP Server

Maintained finance servers if Nonprofit Explorer MCP Server isn't the fit.

Pairs well with

Servers that cover what Nonprofit Explorer MCP Server doesn't - only shown when the pairing reason fits the companion.

More finance MCP servers · Openfec MCP Server · Toolkit MCP Server · Open Markets · Equibles · Yahoo Finance (danishashko)

More TypeScript MCP servers · Ntfy MCP Server · Obsidian MCP Server · Oecd MCP Server · Open Meteo MCP Server · Openalex MCP Server · see all