Conventional HTTP response codes are used to indicate if a request failed or was successful. Codes in the 2xx range indicate success. Codes in the 4xx range indicate that the request failed. In that case, the JSON response will hold an error code and human-readable error message.

authentication_error string, solvable	The `X-ApiKey` header was not added or the key was incorrect. Contact support if you need help.
invalid_endpoint string, solvable	An incorrect endpoint URL was used. Check for typos and make sure to use the endpoints from this documentation.
payload_error string, solvable	The payload contained missing parameters or had an incorrect format. See the error message for details.
quota_error string, solvable	Your monthly quota limit has been reached. Get in touch if you need a higher quota.
processing_error string, not solvable	The worker nodes weren't able to process your request. Please contact support to see if the issue can be fixed.

Example of an error

{
"error_type": "payload_error",
"message": "There was an error."
}