API Reference
Rate Limit
API Reference
Rate Limit
Understand rate limits and how to increase them.
The response headers describe your current rate limit following every request in conformance with the IETF standard:
| Header name | Description |
|---|---|
ratelimit-limit | Maximum number of requests allowed within a window. |
ratelimit-remaining | How many requests you have left within the current window. |
ratelimit-reset | How many seconds until the limits are reset. |
retry-after | How many seconds you should wait before making a follow-up request. |
The default maximum rate limit is 2 requests per second. This number can be increased for trusted senders upon request.
After that, you’ll hit the rate limit and receive a 429 response error code. You can find all 429 responses by filtering for 429 at the Resend Logs page.
To prevent this, we recommend reducing the rate at which you request the API. This can be done by introducing a queue mechanism or reducing the number of concurrent requests per second. If you have specific requirements, contact support to request a rate increase.
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