MCP servers · ActiveCampaign · connector · GPT action
Connect ChatGPT to ActiveCampaign
One line gives ChatGPT your ActiveCampaign account as tools: 10 endpoints, contacts, tags, automations, called with your own connection. No key in the prompt, a receipt for every call, revoke ChatGPT's access alone any time.
Three steps
- Create a free 0n3 account and connect ActiveCampaign. Paste a key or sign in; it lands in your vault, encrypted.
- Install 0n3 into ChatGPT. A custom connector in Developer mode, or an Action on a custom GPT from the OpenAPI spec.
- Ask ChatGPT: whoami. Then: "Create a contact in ActiveCampaign".
Custom connector (needs Developer mode)
- Settings → Connectors (or Apps) → Advanced → Developer mode on
- Create → name 0n3 · MCP server URL https://0n3.app/mcp · Authentication: OAuth
- Finish the sign-in with your 0n account
- Enable the connector in a chat and ask: "whoami"
ChatGPT connectors cannot send a static header, so 0n3 signs you in through its OAuth door (dynamic client registration is on).
The line above carries a placeholder; 0n3.app/install mints a real key named for ChatGPT and fills it in.
What ChatGPT can then do in ActiveCampaign
Contacts · Manage contacts4
Create a contact
POST /contactsList contacts
GET /contactsGet a contact
GET /contacts/{id}Update a contact
PUT /contacts/{id}Tags · Tag contacts2
Add a tag
POST /contactTagsList tags
GET /tagsAutomations · List automations1
List automations
GET /automationsDeals · Manage CRM deals2
Create a deal
POST /dealsList deals
GET /dealsMore · Everything else this app exposes.1
List lists
GET /listsActiveCampaign in other AI clients
Claude Code + ActiveCampaignMCP server + skillClaude (desktop & claude.ai) + ActiveCampaignconnectorCodex CLI + ActiveCampaignMCP serverGemini CLI + ActiveCampaignMCP serverCursor + ActiveCampaignMCP serverVS Code (Copilot) + ActiveCampaignMCP serverWindsurf + ActiveCampaignMCP server