Interesting APIs for training: without keys and payment. Do you know these?

Question

Android

The bottom line is that I want to practice parsing JSON and XML files. The ones I know require registration, a key, etc. But I want to find a high-quality, interesting API that is both free and does not require a key. Is there such a thing? If there is, please share?

Answer 1

Keys are often issued simply for registration. There is a large list here: https://www.publicapis.com/

Answer 2

Unlikely. A high-quality and interesting API implies authorization, or it becomes paid.
Practice on the VK API, the documentation is good. I think I will not be mistaken if I assume that you are registered there. The key is easy to get.