This format is one of the most used to charge for access to an API. It is widely used by companies that provide their services via SaaS (Software as a Service) .
In this model, a value equivalent to the number of calls finland mobile database can be made to your API is usually created. It is a direct relationship between volume and the amount to be paid, and this amount may be fixed or not. Some companies reduce the cost of the call or provide free access for a period of time. This way, the developer can test the API .
One example of this is the Google Maps API. We all know that the service is free, but there is a limit to this free service, which is around 2,500 calls per day. For a large company, this number is very low, which is why Google sells call packages.