Base URL
The Resend API is built on REST principles. We enforce HTTPS in every request to improve data security, integrity, and privacy. The API does not support HTTP. All requests contain the following base URL:Authentication
To authenticate you need to add an Authorization header with the contents of the header beingBearer gm_xxxxxxxxx where gm_xxxxxxxxx is your API Key.
Response codes
Resend uses standard HTTP codes to indicate the success or failure of your requests. In general,2xx HTTP codes correspond to success, 4xx codes are for user-related failures, and 5xx codes are for infrastructure issues.
| Status | Description |
|---|---|
200 | Successful request. |
400 | Check that the parameters were correct. |
401 | The API key used was missing. |
403 | The API key used was invalid. |
404 | The resource was not found. |
429 | The rate limit was exceeded. |
5xx | Indicates an error with Getmany servers. |
Check Error Codes for a comprehensive breakdown of
all possible API errors.
Rate limit
The default maximum rate limit is 20 requests per minute. This number can be increased for trusted senders by request. After that, you’ll hit the rate limit and receive a429 response error code.
Learn more about our rate limits.