Limits on Gradio API (HF Spaces)

Hi,
I am unclear on the rules or pricing for the Spaces - Hugging Face API endpoints. When I send a cURL request, it returns fine, but unlike with https://api-inference.huggingface.co/… I don’t include an API key, so how would it charge me. Or if it is free, then what are the usage limits?

Re-asking the question from 2022. Thank you!

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Calling Gradio Spaces via the API is free and best effort. Only for Zero GPU Spaces, there is a benefit from a token with a Pro subscription. (There is a version-dependent bug.)
It is recommended that people who want stable operation use Endpoint API (dedicated) etc.

The fee is paid by the person hosting the Spaces.

If you’re worried, ask the following support.
Payment related: billing@huggingface.co
General: website@huggingface.co

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