As it stands now, any requests which reaches the backend API will be counted and charged on to the customer.
The problem with this is that if the backend returns an error (HTTP code 4XX or 5XX), the APICast will still count it as a hit and will include it in billing. In this scenario the customer is paying for something without receiving requested data.

Would like to have a feature which can be opt-in, if the service provider do not want the hits to be counted when the backend returns an error.