Buttondown
Manage your Buttondown newsletter subscribers, emails, tags, automations and analytics.
Connect to Buttondown to read and manage subscribers, create and edit email drafts, view analytics, manage tags and automations, and track survey responses. Muse can help you add subscribers, update subscriber information, and draft newsletters.
Try asking Muse: "Add a new subscriber to my newsletter and tag them as a premium member."
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Source: Found in the official MCP Registry (io.usefulapi/buttondown) · First listed October 29, 2026
Last 24 hours
Each bar is one check, every 15 minutes. Green means it answered. Last checked 1 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://buttondown.usefulapi.io/mcpNot 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
Buttondown 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://buttondown.usefulapi.io/mcpWhat people ask Muse to do
Technical details: safety screening, tools, response time and recent checks
Response time at the last check: 341ms. Worked in 100% of checks over 30 days.
Screening · October 29, 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 · 25
buttondown_get_accountThe Buttondown account this API key belongs to: username and e-mail address. GET /accounts/me.buttondown_list_newslettersList the newsletters on the account with name, username, domains, sender, locale and timezone. The newsletter's API key, custom CSS and e-mail templates are never returned. GET /newsletters.buttondown_get_newsletterOne newsletter by id (settings and identity only; no API key, CSS or templates). GET /newsletters/{id}.buttondown_list_subscribersList or search subscribers (newest first by default) with e-mail, type (regular, unactivated, unsubscribed, premium, ...), tags, notes, metadata, source, open/click rates and dates. Filter by e-mail text, type, tag, signup date or domain. GET /subscribers.buttondown_get_subscriberOne subscriber by id or by e-mail address: type, tags, notes, metadata, source, engagement and lifecycle dates. GET /subscribers/{id_or_email}.buttondown_add_subscriberWRITE: add ONE subscriber by e-mail address. No subscriber type is set, so Buttondown applies the newsletter's normal sign-up rules (double opt-in: the subscriber is typically created as unactivated and Buttondown e-mails THAT ONE address a confirmation message; opt-in is never bbuttondown_update_subscriberWRITE: change ONE subscriber's tags, private note or metadata. Tags are merged (add_tags / remove_tags change only those names; the others stay). A given note or metadata replaces the existing value (destructive for that field). The subscriber's type (unsubscribe, block, ...) andbuttondown_list_emailsList emails (drafts, scheduled and sent), newest first by default, with subject, status, publish date, slug, archive URL and analytics summary. The body is left out unless include_body is set. Filter by status, subject text or date. GET /emails.buttondown_get_emailOne email by id with its full body, subject, status, publish date, slug, archive settings and analytics summary. GET /emails/{id}.buttondown_get_email_analyticsDelivery and engagement numbers for one sent email: recipients, deliveries, opens, clicks, failures, unsubscriptions, complaints, replies, page views. GET /emails/{id}/analytics.buttondown_create_email_draftWRITE: create a DRAFT email (status always "draft"). Nothing is sent or scheduled and no subscriber is e-mailed; to send it, the user must open the draft in Buttondown and send it there. This server has no tool that sends or schedules email. Body is Markdown or HTML. POST /emailsbuttondown_update_email_draftWRITE: edit the subject, body, description, slug or preview image of an email that is still a DRAFT (replaces those fields; the previous text is lost unless Buttondown's email history is used). Refuses any email that is not a draft, and never changes status or publish date, so nobuttondown_list_tagsList subscriber tags with name, color, descriptions and whether subscribers can edit them. GET /tags.buttondown_get_tag_analyticsSubscribers created, open rate and click rate for one tag. GET /tags/{id}/analytics.buttondown_create_tagWRITE: create a subscriber tag (needs a Buttondown plan with tags). An existing tag with the same name is returned as an error and not changed. POST /tags.buttondown_list_automationsList automations (welcome sequences and other triggered e-mails) with name, status, trigger, actions and filters (webhook URLs in actions are shown by host only). Read-only: automations are not started or changed. GET /automations.buttondown_get_automationOne automation by id with its trigger, actions and filters. GET /automations/{id}.buttondown_get_automation_analyticsPerformance numbers for one automation. GET /automations/{id}/analytics.buttondown_list_surveysList surveys with question, answers, status and response count. GET /surveys.buttondown_list_survey_responsesList survey responses (who answered what), optionally for one survey, email or subscriber. GET /survey_responses.buttondown_list_segmentsList saved subscriber segments with name, description and filters. GET /segments.buttondown_list_formsList sign-up forms with title, slug, status, tags and subscriber counts. GET /forms.buttondown_list_snippetsList reusable content snippets with identifier, name, mode and how often each is referenced. GET /snippets.buttondown_list_webhooksList configured webhooks with status and subscribed event types. The signing key is never returned and the URL is shown by host only. GET /webhooks.buttondown_list_eventsList delivery events (delivered, opened, clicked, bounced, unsubscribed, ...), newest first, optionally for one email or subscriber. GET /events.Recent checks
Link
https://buttondown.usefulapi.io/mcpQuestions about Buttondown in Muse
How do I connect Buttondown to Muse?
Not in Muse's Connectors list yet, but Muse can still use it. Paste this into Muse: "Use Buttondown to help me. It is a free service with an MCP server at https://buttondown.usefulapi.io/mcp. 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 Buttondown working right now?
At the last check (October 29, 2026, 10:45 UTC) the endpoint was working, answering in 341ms. Over the last 7 days it answered 100% of health checks. It is checked every 15 minutes.
Is Buttondown safe to connect to Muse?
It was screened on October 29, 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 Buttondown do in Muse?
It exposes 25 tools, including buttondown_get_account, buttondown_list_newsletters, buttondown_get_newsletter, buttondown_list_subscribers. For example, you could ask Muse: "Add a new subscriber to my newsletter and tag them as a premium member."
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