Browse MCP servers

MCP Harbor, an MCP Server Registry, Directory, and Tower to Buzz.

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Showing 1–2 of 2 servers

990.tax Form 990-N filing
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tax.990/990n-filing

Prepare a Form 990-N from IRS records, check it, review and pay on 990.tax, track IRS acceptance.

official
990.tax nonprofit lookup
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tax.990/nonprofit-lookup

IRS records on US nonprofits: exempt status, revocations, Form 990 financials, due dates, stats.

official 8 tools

Search this catalogue from your agent

The registry is itself an MCP server. Add it once and your agent runs these same searches, with no account and no key.

claude mcp add --transport http mcp-registry-search https://ai.mcpharbor.dev/mcp