0n3
MCP servers · marketing

Mailchimp MCP server

Email marketing — audiences, campaigns, automations, templates, analytics. Hosted by 0n3: 12 endpoints your AI can call with your own Mailchimp account, from Claude, ChatGPT, Cursor, Claude Code, Codex or Gemini CLI. One sign-in, one key per AI, a receipt for every call.

Connect MailchimpInstall into your AIWatch it work

12 endpoints5 categoriesauth: api_keyhosted

What your AI can do with Mailchimp

Audiences · View and manage audiences/lists2
List audiencesGET /lists
Get an audienceGET /lists/{listId}
Members · Add and manage subscribers4
Add a memberPOST /lists/{listId}/members
Update a memberPATCH /lists/{listId}/members/{subscriberHash}
List membersGET /lists/{listId}/members
Search membersGET /search-members
Campaigns · Create and send email campaigns4
List campaignsGET /campaigns
Create a campaignPOST /campaigns
Send a campaignPOST /campaigns/{campaignId}/actions/send
Get a campaign reportGET /reports/{campaignId}
Templates · View email templates1
List templatesGET /templates
More · Everything else this app exposes.1
List automationsGET /automations

Install in three steps

  1. Create a free account at 0n3.app and connect Mailchimp: paste a key or sign in through a door. It lands in your vault, encrypted.
  2. Open 0n3.app/install, pick your AI. A key is made for that AI alone; copy the line it gives you.
  3. Ask your AI: whoami. It answers with your connected services. Then ask it to list audiences in Mailchimp.
Install (user scope — every project)
claude mcp add --transport http --scope user 0n3 https://0n3.app/mcp --header "Authorization: Bearer <your 0n token>"

Connect Mailchimp to

Claude Code + MailchimpMCP server + skillClaude (desktop & claude.ai) + MailchimpconnectorChatGPT + Mailchimpconnector · GPT actionCodex CLI + MailchimpMCP serverGemini CLI + MailchimpMCP serverCursor + MailchimpMCP serverVS Code (Copilot) + MailchimpMCP serverWindsurf + MailchimpMCP server

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Questions

What can an AI do with the Mailchimp MCP server?

12 things: audiences, members, campaigns, templates and more. Every call runs with your own Mailchimp connection and lands on a receipt.

Do I need to run anything on my computer?

No. 0n3 is hosted. Connect Mailchimp once, install 0n3 into your AI with one line, done.

Where does my Mailchimp key go?

Into your 0n3 vault, encrypted, one record per connection. The AI never sees it.