Is there a Way to Limit the Response in the API?

Also another question not related with the above one. Is there a way to limit the response in the API? i mean, if i want to hide "unpublished" documents in the API response? (havent tested, is a question my colleagues made me)

The drafts only show up using authenticated requests, but you can filter them with GROQ. See this article https://www.sanity.io/docs/drafts

Thank you , but if using authenticated requests, all the data of my document Studio will be available, right?

Yes, that's correct. Drafts don't show in the unauthenticated API by default though, only published documents.