Free-tier limits
Projects per user | 1 |
Subscribers per project | 5,000 |
Sends per project per UTC month | 10,000 |
Webhook delivery timeout | 5 s |
Subscribe / unsubscribe rate limit | 60 / min |
Event tracking rate limit | 600 / min |
Hard caps return 403 (subscribers) or 429 (sends). More on the FAQ.