Rate limits apply only to Backend API requests.
API requests limit rate: 400 requests per 1 minute (period).
Rate limits will be returned with every request in the following headers:
X-Rate-Limit-Limit- The number of allowed requests in the current periodX-Rate-Limit-Remaining- The number of remaining requests in the current periodX-Rate-Limit-Reset- The number of seconds left in the current period
If you'll reach rate limit - you'll get 429 response.
API errors logs
All errors resulting from POST requests, with the exception of events errors, already exists errors and system-level errors, are recorded in the API Issues section, which you can access by navigating to Store Settings > API > API Issues in Omnisend app. If you encounter unexpected behavior and do not see an error response in your request flow, consult these logs to diagnose and resolve the issue. This logging mechanism helps troubleshooting for most POST operation failures.