What public api can be used for test requests from any service?

Question

API

For verification, I need to be able to check how everything will look in the end. It is desirable, of course, that approximately according to my data, and not fish-texts.
Tell me what services you use, which ones are better, is it worth using them?

Answer 1

https://httpbin.org/ and Postman
you won’t understand if you need a server or a client