Nonprofit Explorer MCP server

online · 100% uptime

by cyanheads·io.github.cyanheads/nonprofit-explorer-mcp-server·v0.3.0·2 stars

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

A93/100grade A

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Safety scan

A93/100

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Adoption

Growing

2 stars606 downloads/wk

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Nonprofit Explorer tools

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How Nonprofit Explorer compares

Against every graded MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score: 93/100; higher than 96% of 48,255 servers
Uptime: 100%; of our recent checks; the typical remote server answers 100%
Response time: 508 ms; faster than 29% of 30,031 servers
GitHub stars: 2; more than 75% of 28,688 servers
Downloads a week: 606; more than 90% of 12,191 servers with a package

Release history: 5 versions in the registry since 2026-08-25, latest 2026-11-03, typically one every 19 days.

Install Nonprofit Explorer in Claude Code, Cursor or VS Code

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

Add to Cursor

What the publisher says

From the Nonprofit Explorer repository's README, as published. We do not edit it. Read it on GitHub

@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. 3 Tools

Public Hosted Server: https://nonprofit-explorer.caseyjhand.com/mcp

Overview

IRS Form 990 data for 1.8M+ tax-exempt organizations, via the ProPublica Nonprofit Explorer API. Search by name, fetch an org's financial snapshot, and pull its full filing history from any MCP client. Runs as a stdio process, a local Streamable HTTP server, or the public hosted endpoint above.

Tools

Capability reference

nonprofit_search tool

Shortened. The full README is on GitHub.

Nothing above is checked by us. What we check is on the safety report.

Nonprofit Explorer: common questions

Is Nonprofit Explorer MCP server safe?: Yes, by our scan: it is graded A (93/100). Read the Nonprofit Explorer safety report
How do I install Nonprofit Explorer?: It runs remotely at nonprofit-explorer.caseyjhand.com. Add it to Claude Code, Cursor, VS Code or Claude Desktop with the snippets above, or call it through the mcp.market gateway without installing anything.
Does Nonprofit Explorer need an API key?: No secret keys are declared. It reads 8 settings from the environment.
Is Nonprofit Explorer maintained?: The last commit was 26 days ago (2026-10-09). The latest release is v0.3.0.
Is Nonprofit Explorer up?: 100% of our last 28 checks got an answer. We check remote servers about four times a day.
How does Nonprofit Explorer compare with other MCP servers?: safety score 93/100 (higher than 96% of 48,255 servers); uptime 100% (of our recent checks; the typical remote server answers 100%); response time 508 ms (faster than 29% of 30,031 servers). Full comparison.

Run it through the gateway

With the gateway added, ask your agent for it by name:

agent prompt

call io.github.cyanheads/nonprofit-explorer-mcp-server → <tool>

Free per call. Metered, capped by your key, logged for reliability.

Add the gateway (gw.mcp.market)

Rating: —
Safety grade: A · 93/100
Stars: 2
Downloads/wk: 606
Price: Free
Licence: Apache-2.0
Transport: Remote · mixed
Uptime: 100% · 28/28 checks
Version: 0.3.0
Category: Everything else
Last release: 2026-10-09

Credentials it needs

MCP_LOG_LEVELSets the minimum log level for output (e.g., 'debug', 'info', 'warn').
MCP_TRANSPORT_TYPESelects the HTTP transport.
MCP_HTTP_HOSTThe hostname for the HTTP server.
MCP_HTTP_PORTThe port to run the HTTP server on.
MCP_HTTP_ENDPOINT_PATHThe endpoint path for the MCP server.
MCP_PUBLIC_URLPublic origin override for deployments behind a TLS-terminating reverse proxy.
MCP_AUTH_MODEAuthentication mode to use: 'none', 'jwt', or 'oauth'.
MCP_LOG_LEVELSets the minimum log level for output (e.g., 'debug', 'info', 'warn').

Endpoint

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

streamable-http

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