Common Error Codes

HTTP Status	Description
400	Bad Request - Invalid parameters
401	Unauthorized - Invalid or missing API key
404	Not Found - Model or resource not found
422	Unprocessable Entity - Validation error
429	Too Many Requests - Rate limit exceeded
500	Internal Server Error
503	Service Unavailable - Balance replenishing

Balance Replenishing (503): If you receive a balance_replenishing error, your account balance is being updated. Simply retry your request after a short delay.