Koskamo

US Nonprofit & Charity Check MCP

A remote MCP server that allows AI agents to check US charities and nonprofits by name or EIN. It provides basic nonprofit details for free and offers Form 990 financial history and prospect lists for subscribers. Data is sourced from ProPublica Nonprofit Explorer.

Endpoint and access

No sign-in to connect and list tools. Individual tools may still need a vendor account, credentials, or permissions; check the documented prerequisites.

US Nonprofit & Charity Check MCP logo, by Donnie MorrisonCommunity listingStreamable HTTPNo sign-inEndpoint checked 2026-11-01Published by Donnie Morrison
MCP endpoint (Streamable HTTP)
https://us-nonprofit-check-mcp.donniertf.workers.dev/mcp
Vendor documentation

What you can do with it

  • Find a US nonprofit or charity by name or EIN
  • Retrieve Form 990 financial history including revenue and expenses
  • Generate nonprofit prospect lists matching keywords in a state

Source and maintenance

Community listingRegistry 1.0.0
mcp-registry: io.github.donniertf-hub/us-nonprofit-check-mcp@1.0.0Source repositoryProject website
Maintenance checked

Protocol and capabilities

Server
us-nonprofit-check-mcp 1.0.0
MCP protocol
2025-06-18
Tools
3 advertised
Resources
Not advertised
Resource templates
Not advertised
Prompts
Not advertised
Server-advertised capabilities
{
  "tools": {
    "listChanged": false
  }
}

Server-provided instructions

Untrusted server output shown for inspection. It is not Koskamo guidance and is excluded from knowledge search.

US Nonprofit & Charity Check. nonprofit_check is free. Subscribe ($9/month, cancel anytime) at https://us-nonprofit-check-mcp.donniertf.workers.dev/buy for the paid tools, then pass access_token.

Tools

3 advertised

nonprofit_check
Advertised by the server during the last successful anonymous check.

FREE. Find a US nonprofit/charity by name or EIN — top 3 with city, state and 501(c) type.

nonprofit_check input schema
{
  "type": "object",
  "required": [
    "name"
  ],
  "properties": {
    "name": {
      "type": "string"
    },
    "state": {
      "type": "string"
    }
  }
}
financials
Advertised by the server during the last successful anonymous check.

PRO. Form 990 financial history for an EIN: revenue, expenses, assets, liabilities, officer compensation, program/overhead ratio by year.

financials input schema
{
  "type": "object",
  "required": [
    "ein"
  ],
  "properties": {
    "ein": {
      "type": "string"
    },
    "access_token": {
      "type": "string",
      "description": "Subscriber token from /success (or Authorization: Bearer)"
    }
  }
}
prospect_list
Advertised by the server during the last successful anonymous check.

PRO. Nonprofits matching a keyword in a state (e.g. 'food bank', 'hospital', 'school') — for fundraising consultants, SaaS and grant writers.

prospect_list input schema
{
  "type": "object",
  "required": [
    "keyword"
  ],
  "properties": {
    "page": {
      "type": "number"
    },
    "state": {
      "type": "string"
    },
    "keyword": {
      "type": "string"
    },
    "access_token": {
      "type": "string",
      "description": "Subscriber token from /success (or Authorization: Bearer)"
    }
  }
}

Prompts

Not advertised

No prompt definitions available.

Resources

Not advertised

No resource definitions available.

30-day availability

Aggregated from read-only remote checks; this is not a tool-execution or security guarantee.

Successful checks
1 of 1 (100%)
Average latency
474 ms
95th percentile latency
474 ms

Maintenance history

Public check and source-refresh events. Editorial and ownership records remain private.

  • · probe · passed · 474 ms · metadata changed · 3 tool(s)

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers the remote server. Use --scope project to write .mcp.json for the repo.
Claude Code configuration
claude mcp add --transport http us-nonprofit-charity-check-mcp https://us-nonprofit-check-mcp.donniertf.workers.dev/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).
Codex configuration
codex mcp add us-nonprofit-charity-check-mcp --url https://us-nonprofit-check-mcp.donniertf.workers.dev/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable us-nonprofit-charity-check-mcp in your MCP settings.
Cursor configuration
{
  "mcpServers": {
    "us-nonprofit-charity-check-mcp": {
      "url": "https://us-nonprofit-check-mcp.donniertf.workers.dev/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure).
Cline configuration
{
  "mcpServers": {
    "us-nonprofit-charity-check-mcp": {
      "type": "streamableHttp",
      "url": "https://us-nonprofit-check-mcp.donniertf.workers.dev/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start us-nonprofit-charity-check-mcp and inspect its tools.
VS Code configuration
{
  "servers": {
    "us-nonprofit-charity-check-mcp": {
      "type": "http",
      "url": "https://us-nonprofit-check-mcp.donniertf.workers.dev/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.
Gemini CLI configuration
gemini mcp add --transport http us-nonprofit-charity-check-mcp https://us-nonprofit-check-mcp.donniertf.workers.dev/mcp

Claude Desktop

Merge this into claude_desktop_config.json (macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\), then restart Claude Desktop.
Claude Desktop configuration
{
  "mcpServers": {
    "us-nonprofit-charity-check-mcp": {
      "url": "https://us-nonprofit-check-mcp.donniertf.workers.dev/mcp"
    }
  }
}

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.
Windsurf configuration
{
  "mcpServers": {
    "us-nonprofit-charity-check-mcp": {
      "serverUrl": "https://us-nonprofit-check-mcp.donniertf.workers.dev/mcp"
    }
  }
}

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