zero cost failed requests

https://future-wiki.win/index.php/Why_Developers_Are_Moving_to_One_API_Key_for_All_Models

When you get charged for server errors that never reached your users, it stings even more. 'Zero cost failed requests' means exactly that: if our system fails to process something, you don't pay a cent for it. No hidden costs, no surprise bills from errors that weren't your fault. This approach is fair, transparent, and gives you peace of mind knowing that failure doesn't come with a penalty.