Smartlead offers an extremely flexible API infrastructure to help you automate your entire outbound email marketing system truly.
Smartlead has only 1 core Rate Limit:
60 requests Per 60 seconds per API key.
The response headers of GET requests will contain your pending limit, so you can auto-adjust your request frequency, look out for these 3 fields in the response headers:
- x-ratelimit-limit (will show 60 requests)
- x-ratelimit-remaining (how many requests left for the current 60s window)
- x-ratelimit-reset (when the next reset happens)
For uploading leads, you can batch leads upto 350 leads per upload allowing you to add 21k leads per minute.
This will be improved to accommodate for more.
Integration partners can reach out for custom limits.