5$ free use are restricted?

Hello,
I tried to use the 5$ free use for the API. I wanted to call the API several thousands times, but I get only few responses in an hour.

Are the API-calls restricted to 50 calls per 3 hours, if one uses the free use 5$?

Hi and welcome to the Developer Forum!

You need to add a valid payment method to your account in the billing and payments section (linked below) before your rate limits will be unlocked.

Thanks.

That confirms what I have thought.

To the best of my knowledge, this 5$ quota is also not available for fine-tuning.