# Error codes All API responses are in JSON format. A `result` field, with a value of `success` or `error` is returned with each request. In the event of an error, a `message` field will provide an error message. **HTTP error codes** The Kaiko platform API uses the following error codes: | Error Code | Meaning | | ---------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | 400 | Bad Request | | 401 | Unauthorized -- You are not authenticated properly. See [Authentication](https://docs.kaiko.com/#authentication)[.](https://docs.kaiko.com/rest-api/general/getting-started/authentication) | | 403 | Forbidden -- You don't have access to the requested resource. | | 404 | Not Found | | 405 | Method Not Allowed | | 406 | Not Acceptable | | 429 | Rate limit reached | | 500 | Internal Server Error -- We had a problem with our service. Try again later. | | 503 | Service Unavailable -- We're temporarily offline for maintenance. |