501c3.HELP Nonprofit Compliance
Look up nonprofit compliance rules for any US state with official citations and verification status.
Provides nonprofit formation, governance, solicitation, reporting, tax and employment compliance requirements for all 50 US states. Each rule includes official citations and verification status. Compare requirements across states or check filing deadlines and fees.
Try asking Muse: "What are the charitable solicitation registration requirements for nonprofits in California and New York?"
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Source: Found in the official MCP Registry (help.501c3/compliance) · First listed October 28, 2026
Last 24 hours
Each bar is one check, every 15 minutes. Green means it answered. Last checked 3 h ago.
Is it safe to connect?
What Muse can see: It does not ask you to sign in, so it cannot see your accounts. It only sees what Muse sends it from your request.
Before it acts: Read what Muse plans to do before you approve it, and remove the app from Muse when you stop using it.
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How to add it to Muse
Not in Muse's Connectors list yet, but Muse can still use it. Copy the request below and paste it into Muse. Muse asks before it shares anything with the app's site. Meta does not review apps used this way, so only use ones you trust. We tested this in the Muse app on September 24, 2026: Muse used an app's link directly this way and returned a live answer.
https://mcp.501c3.help/Not in Muse's Connectors list yet. Muse can still use it: its page gives you a request to paste into Muse.
Also use it in ChatGPT or Claude
501c3.HELP Nonprofit Compliance is a remote MCP server, so any assistant that can add a custom connector by link can use it. Same link, same tools.
Add it to ChatGPT
- 1
Open ChatGPT settings
In ChatGPT, open Settings, then Connectors (called Apps & Connectors on some accounts).
- 2
Turn on developer mode
Under Advanced settings, switch on Developer mode. That is what lets you add a connector by link.
- 3
Create the connector
Choose Create, give it a name, paste the link as the MCP server URL, and save. If it needs a sign-in, ChatGPT asks for it here.
- 4
Use it in a chat
Start a chat, open the tools menu, pick the connector, and ask. ChatGPT asks before it runs a tool the first time.
Custom connectors need a paid ChatGPT plan, and on Team, Enterprise and Edu accounts only an admin can add them. Our "Working" label means the server answered us; it cannot tell whether your plan lets you add it. All connectors that work in ChatGPT
Add it to Claude
- 1
Open Claude settings
In Claude, open Settings, then Connectors.
- 2
Add a custom connector
Choose Add custom connector, give it a name, and paste the link.
- 3
Connect and use it
If it needs a sign-in, Claude sends you to it. Then turn the connector on in a chat from the tools menu and ask.
Custom connectors are available on paid Claude plans; on Team and Enterprise accounts an admin may need to add them. Our "Working" label means the server answered us; it cannot tell whether your plan lets you add it. All connectors that work in Claude
https://mcp.501c3.help/What people ask Muse to do
Technical details: safety screening, tools, response time and recent checks
Response time at the last check: 70ms. Worked in 100% of checks over 30 days.
Screening · October 28, 2026
Screened, no issues found
Screening looks for known threats and hidden instructions at the time of the check, and runs again weekly and whenever the tool list changes. It cannot see the server's code, so only connect what you need and review what Muse asks to do. How screening works.
Tools · 3
get_state_requirementsNonprofit compliance requirements for one US state, from 501c3.help's sourced records: formation, governance, charitable solicitation registration, reporting, tax and employment. Every record carries its official citation and a verification status. Records marked review_required compare_statesThe same compliance topic across several US states, for deciding where to incorporate or for an organization that operates in more than one state. Each state's records carry their own citation and verification status; a record marked review_required is unsettled and must not be pget_filing_deadlinesEvery 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. Use this for 'what is due and when'. Deadlines on records marked review_required are not settled and must be shown as uRecent checks
Link
https://mcp.501c3.help/Questions about 501c3.HELP Nonprofit Compliance in Muse
How do I connect 501c3.HELP Nonprofit Compliance to Muse?
Not in Muse's Connectors list yet, but Muse can still use it. Paste this into Muse: "Use 501c3.HELP Nonprofit Compliance to help me. It is a free service with an MCP server at https://mcp.501c3.help/. It does not need an API key. Ask me before you share anything with it." Muse asks before it shares anything with the app's site. Meta does not review apps used this way, so only use ones you trust. We tested this in the Muse app on September 24, 2026: Muse used an app's link directly this way and returned a live answer.
Is 501c3.HELP Nonprofit Compliance working right now?
At the last check (October 29, 2026, 09:16 UTC) the endpoint was working, answering in 70ms. Over the last 7 days it answered 100% of health checks. It is checked every 15 minutes.
Is 501c3.HELP Nonprofit Compliance safe to connect to Muse?
It was screened on October 28, 2026 with the result "screened, no issues found". Screening checks the domain against threat feeds and reads the tools for hidden instructions and requests for passwords or card numbers. It cannot see the server's code, so grant only the access you need.
What can 501c3.HELP Nonprofit Compliance do in Muse?
It exposes 3 tools, including get_state_requirements, compare_states, get_filing_deadlines. For example, you could ask Muse: "What are the charitable solicitation registration requirements for nonprofits in California and New York?"
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