What ActiveCampaign exposes
I run ActiveCampaign through an official MCP server, a REST API, and native ChatGPT and Claude integrations, which is most of what I need for agent-driven email workflows. My API covers contacts, lists, campaigns, automations, deals, and tracking, with auth via either API key or OAuth depending on the use case. The MCP server is built and maintained by ActiveCampaign directly, so I can wire Claude or ChatGPT into my account without a middleware layer. For no-code glue, Zapier and Make both have full connectors. Webhook availability isn't documented in the data I have, so I'd confirm event triggers against the developer docs before building anything that depends on push notifications.
Pricing, limits, and integration
Auth is a single Api-Token passed as an HTTP header, so there is no OAuth dance to set up. The catch worth flagging early: your base URL is account and region specific, of the form https://{youraccount}.api-us1.com/api/3/. Grab it from your account rather than hardcoding a shared host, or every call 404s.
The rate limit is 5 requests per second per account. Cross it and you get a 429 with a Retry-After header telling you how long to wait, so the API is honest about backoff rather than failing silently. Five per second is fine for event-driven and interactive work, but plan real throttling and retry logic before you fire a bulk contact sync or a full pipeline export. On top of REST you get webhooks for event-driven flows, which means you can react to a new contact or a stage change without polling, and native Zapier and Make connectors that cover a large share of integrations with no code at all.
How much does the ActiveCampaign API actually cost?
ActiveCampaign publishes an API, but per-tier gating wasn't extracted automatically.
- Most likely scenario: API access is either included in all paid plans, or it's gated to higher tiers and we need to verify on the live docs page.
- Until verified, treat the question "which plan unlocks the API" as open. Don't budget on the assumption it's free with the cheapest paid plan.
API at a glance
Which AI clients can read ActiveCampaign data?
Not every AI assistant supports MCP natively. Here's the per-client picture for ActiveCampaign specifically.
| Client | Support | Notes |
|---|---|---|
| Claude (Desktop/Web) | Native MCP | Paste the Remote MCP URL from ActiveCampaign Developer settings into Claude. ActiveCampaign was the first marketing platform in Claude's official connector directory. |
| ChatGPT | Native MCP | Connect via the Remote MCP URL; works with ChatGPT MCP-compatible connectors. |
| Cursor | Native MCP | Add the Remote MCP URL to Cursor's MCP config. Any MCP-compatible client works the same way. |
ActiveCampaign also has an MCP server
If you're wiring ActiveCampaign into Claude / Cursor / Codex, the MCP server is usually less code than the REST API.
See ActiveCampaign MCP pageWhat you can build with the ActiveCampaign API
Three personas, three different shapes of build. Pick the row that matches how you actually ship.
Glue ActiveCampaign into your daily workflow
- Pull a digest of fresh activity into your morning Slack
- Trigger a one-off backfill when something looks off
- Pipe data into your own SQLite for ad-hoc queries
Sell ActiveCampaign reporting at scale
- White-label ActiveCampaign data into client-branded dashboards
- Run scheduled multi-account reports without logging into the ActiveCampaign UI
- Cross-reference with the rest of the client's stack (CRM, analytics, ad spend)
Production pipelines for ActiveCampaign
- Real-time sync into your warehouse via webhooks
- Custom alerts the dashboard's built-in alerting can't express
- Backfill + idempotency handling for ActiveCampaign data older than the dashboard exposes
Quickstart template
# Starter template — endpoint paths and SDK package names come from # the ActiveCampaign API docs: https://developers.activecampaign.com/reference/overview curl -X GET "https://developers.activecampaign.com/<your-endpoint>" \ -H "Authorization: Bearer $TOKEN" \ -H "Accept: application/json" | jq .
Template only. Endpoint paths, exact base URL, and auth header format come from developers.activecampaign.com/reference/overview.
Limits and gotchas
- No OpenAPI spec — you write typed clients by hand or use a third-party generator on the docs HTML.
- Webhooks available — react to ActiveCampaign events in real time instead of polling.
- No official SDK detected. Plan on hitting the API directly with your HTTP client of choice.
- Rate limits: always read the docs page before scaling — the published limit is usually lower than the practical one and overages can be expensive.
- No-code fallback: Zapier and Make.com cover the common triggers if you want to skip writing API code for simple flows.
Agent-readiness verdict
Score: 8/10 on API-readiness. The v3 REST API covers contacts, deals, automations, campaigns, lists, tags, custom fields, and ecommerce with simple Api-Token header auth, webhooks for event-driven flows, and native Zapier and Make connectors. That is a complete and practical surface. The two things keeping it at an 8: the account and region specific base URL means you have to read it out of the app rather than assume a global endpoint, and the 5 requests per second per account rate limit is workable but tight enough that bulk syncs need real backoff handling.
Solid agent-fit with official MCP support and documented API access. ActiveCampaign's official MCP server and native Claude integration create a direct path for agents to manage email campaigns and automation workflows. The lack of published OpenAPI specs and structured outputs will require more manual prompt engineering to ensure reliable data handling.
ActiveCampaign API FAQ
Does ActiveCampaign have a public API?+
Does ActiveCampaign support webhooks?+
Should I use the API or the MCP server for Claude / Cursor / Codex?+
Sources
- ActiveCampaign official site: https://www.activecampaign.com/
- API docs: https://developers.activecampaign.com/reference/overview
- MCP server: https://www.activecampaign.com/platform/ai-mcp
10+ years in digital marketing. I review marketing software for AI-stack fit: real pricing, MCP and API support, and how cleanly each tool drops into an AI agent workflow, cross-checked against verified data and real user feedback.