Databases

501c3.help

Provides 501(c)(3) nonprofit compliance requirements, filing deadlines, and multi-state comparisons by US state.

1 endpoint3 known toolsFirst detected October 2, 2026Last detected October 2, 2026

ENDPOINT 1

https://mcp.501c3.help

No auth detected

MCP server metadata

Name: 501c3help-compliance
Version: 0.1.0

Capabilities

tools

Server instructions

US nonprofit compliance requirements for all fifty states, sourced to official government citations. Always show the citation and the verification status alongside any requirement you repeat. Data licence and free API keys: https://501c3.help/license/

Known tools 3

get_state_requirements

Nonprofit compliance requirements for one US state, from 501c3.

Inferred read-only

compare_states

The same compliance topic across several US states, for deciding where to incorporate or for an organization that operates in more than one state.

Inferred read-only

get_filing_deadlines

Every requirement in one US state that has a filing deadline attached, with the deadline in plain words, the form or portal, the fee, and the official citation.

Inferred read-only

CONNECT WITH APPROVAL

Client installation

Review this server and its permissions before adding it. Secret placeholders must be set locally.

Codex

~/.codex/config.toml

[mcp_servers.501c3help-compliance]
url = "https://mcp.501c3.help"
enabled = true

Claude Code

.mcp.json

{
  "mcpServers": {
    "501c3help-compliance": {
      "type": "http",
      "url": "https://mcp.501c3.help"
    }
  }
}

Claude Desktop

Settings → Connectors → Add custom connector

Name: 501c3help-compliance
Remote MCP URL: https://mcp.501c3.help

Add this remote URL as a custom connector in Claude Desktop. Availability depends on the user plan and workspace policy.

Cursor

.cursor/mcp.json

{
  "mcpServers": {
    "501c3help-compliance": {
      "url": "https://mcp.501c3.help"
    }
  }
}

Visual Studio Code

.vscode/mcp.json

Add to Visual Studio Code

{
  "servers": {
    "501c3help-compliance": {
      "type": "http",
      "url": "https://mcp.501c3.help"
    }
  }
}

Generic MCP

Client-specific MCP configuration

{
  "name": "501c3help-compliance",
  "transport": "streamable-http",
  "url": "https://mcp.501c3.help"
}

MCP Inspector

Run the official MCP Inspector locally and enter the indexed Streamable HTTP endpoint.

TRUST AND VERIFICATION EVIDENCE

Loading Trust v2 evidence…

Checking the associated registrable domain. The BuiltWith key remains server-side.

Indexed

Evidence is source-attributed and does not guarantee that a third-party server is safe. Risk labels are conservative metadata heuristics.