Hi,

thanks for your interest in our API we appreciate this a lot as things like these make us more committed about making this API even better.

As for the clarification you asked, to use our API you have to subscribe a plan. Once subscribed you can issue calls till the limit for that plan, each call over the limit will be charged for the extra quota price.
You can find more about the mashape API price police here.
Let us know for any other doubt or problem.
We hope to have you aboard soon.
bye