Well, because it is not free.
Every day the daily quota is reset to the fixed amount without any compounds.
In case of an error (either with status 400 or 500 ) there will not be any units charge.
Our Cloud infrastracture is able to handle hundreds of requests together at the same time.
Everyday at 00.00 (midnight) Coordinated Universal Time (UTC)
Since the computational complexity of an API call greatly varies depending on the query parameters, it is not possible to assign a fixed cost to each endpoint.
Should none of the listed solutions be well suited for your needs, we are happy to have a chat about it.