Learn how to authenticate and interact with the isend.ai API, including base URL, headers, error codes, and limits.

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Base URL

All requests to the isend.ai API must use HTTPS and follow RESTful conventions. Base URL: 
https://api.isend.ai
Requests over plain HTTP are rejected for security reasons.

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Authentication

Authenticate your requests by including your API key in the Authorization header using the Bearer token format. 
Authorization: Bearer is_xxxxxxxxxxxxxxxxxxxxx
You can generate an API key from the isend.ai dashboard.

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Response Codes

The API uses standard HTTP status codes to indicate the result of requests.
StatusDescription
200The request was successful.
400Invalid request. Check your parameters.
401Missing or malformed API key.
403API key is invalid or unauthorized.
404Resource not found.
429Rate limit exceeded.
5xxServer-side error. Try again later.
For a detailed list of possible API errors, see Error Codes.

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Rate Limits

The default rate limit is 2 requests per second per API key. If your integration requires a higher limit, contact support to request an increase. When you exceed the rate limit, you’ll receive a 429 Too Many Requests error. More details: Rate Limits

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FAQ