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Nonprofit Explorer MCP Server

answering

Nonprofit Explorer MCP Server is answering right now. Last checked 14 min ago. 82 installs a week from npm. It exposes 3 tools. Last commit 25 Aug 2026.

MCP server for nonprofit financials via ProPublica — IRS Form 990 data for 1.8M+ nonprofits.

Installs per day peak 182 · avg 18 · +76% w/w
a month agotoday
Uptime history 47 days of history · worst day 0%
47 days agonow
100.0%
Uptime 24h
91 of 91 checks
3
Tools
read from the server
371 ms
Response time
average over 24h
82
Installs / week
npm and PyPI

What changed 12

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 13 August 2026. No other catalogue keeps this.

25 Aug 3 tools changed the parameters they ask for nonprofit_get_filings, nonprofit_get_organization, nonprofit_search
25 Aug a tool changed version
13 Aug 3 tool descriptions were rewritten nonprofit_get_filings, nonprofit_get_organization, nonprofit_search
13 Aug a tool changed version3 times that day
13 Aug a tool changed the parameters it asks for2 times that day nonprofit_search
and 3 more, back to 13 August 2026

Nothing serious here today

Today is the operative word: we check Nonprofit Explorer MCP Server every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Three servers free · no card

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 14 min ago.

run in your terminal
claude mcp add nonprofit-explorer-mcp-server --transport http https://nonprofit-explorer.caseyjhand.com/mcp
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "nonprofit-explorer-mcp-server": {
      "url": "https://nonprofit-explorer.caseyjhand.com/mcp"
    }
  }
}
~/.codex/config.toml
[mcp_servers.nonprofit-explorer-mcp-server]
url = "https://nonprofit-explorer.caseyjhand.com/mcp"
.cursor/mcp.json
{
  "mcpServers": {
    "nonprofit-explorer-mcp-server": {
      "url": "https://nonprofit-explorer.caseyjhand.com/mcp"
    }
  }
}
.vscode/mcp.json
{
  "mcpServers": {
    "nonprofit-explorer-mcp-server": {
      "url": "https://nonprofit-explorer.caseyjhand.com/mcp"
    }
  }
}

This one needs environment variables set before it will start: MCP_HTTP_HOST (The hostname for the HTTP server.), MCP_HTTP_PORT (The port to run the HTTP server on.), MCP_HTTP_ENDPOINT_PATH (The endpoint path for the MCP server.), MCP_PUBLIC_URL (Public origin override for deployments behind a TLS-terminating reverse proxy.), MCP_AUTH_MODE (Authentication mode to use: 'none', 'jwt', or 'oauth'.), MCP_LOG_LEVEL (Sets the minimum log level for output (e.g., 'debug', 'info', 'warn').). The author declared them in the registry entry; get the values from the project itself.

Available tools 3

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

nonprofit
nonprofit_get_filings
All Form 990 filings for a tax-exempt org by EIN: year-by-year revenue, expenses, assets, liabilities, net assets, revenue breakdown, executive compensation, and source PDF links. Use for trend analysis, due diligence, and accessing primary 990 documents. The filing year (tax_prd_yr) is the fiscal year of the return — data lags 1–2 years; always cite the year. An organization that resolves but has filed no 990 returns an empty filings array with a notice, not an error. Also returns filings_pdf_only — older filings with a PDF but no extracted financial data. Data from ProPublica Nonprofit Explorer, sourced from IRS Form 990 filings.
nonprofit_get_organization
Full profile for a single tax-exempt org by EIN: legal name, address, NTEE classification, 501(c) type, IRS ruling date, and a financial snapshot from the most recent Form 990 filing (revenue, expenses, assets, net assets, and the source PDF link). Also returns the IRS Business Master File standing — whether contributions are deductible, exemption status, and public-charity vs. private-foundation classification. Use nonprofit_search first if you only have an org name — this tool requires an EIN. Data lags 1–2 years; the tax year is shown prominently. Data from ProPublica Nonprofit Explorer, sourced from IRS Form 990 filings.
nonprofit_search
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 paginated at 25 per page; use the page parameter and num_pages to paginate. Total results cap at 10,000 in the API; if total_results === 10000 the actual count may be higher. A zero-match query and a page past the last one both return an empty organizations array with a notice rather than an error; only a page whose offset reaches that 10,000 cap is refused. Supports quoted phrases ("Red Cross"), required terms (+evanston), excluded terms (-dental). Data from ProPublica Nonprofit Explorer, sourced from IRS Form 990 filings.

Endpoints

URLTransportStateLatencyChecked
https://nonprofit-explorer.caseyjhand.com/mcp streamable-http answering 239 ms 14 min ago

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Nonprofit Explorer MCP Server — questions

Answers built from our own checks of this server.

What can Nonprofit Explorer MCP Server do?
It exposes 3 tools, read directly from the server on our last check. Among them: nonprofit_get_filings, nonprofit_get_organization, nonprofit_search. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →
Is Nonprofit Explorer MCP Server working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 91 checks got a reply (100.0%), average response time 371 ms. The bar chart above shows every period we have measured.
How do I connect Nonprofit Explorer MCP Server?
Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.
Does Nonprofit Explorer MCP Server need an API key?
No. Nonprofit Explorer MCP Server completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 3 of them are readable on this page. This is what we observed, not what the docs claim.
How fast is Nonprofit Explorer MCP Server?
It answers our handshake in 371 ms on average, which is faster than 41% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.
How many people use Nonprofit Explorer MCP Server?
The npm package @cyanheads/nonprofit-explorer-mcp-server was installed 82 times in the last week. Week over week that is +76%. We show installs rather than GitHub stars on purpose: a star is a bookmark, an install is someone actually running it.
Is Nonprofit Explorer MCP Server open source?
Yes — it is published under the Apache-2.0 licence, written in TypeScript, 2 stars on GitHub and 1 open issue. The source link is on this page, so you can read exactly what it does with your data before you connect it.