[voidUpdate]

We use it at my work because one team will create the backend, and another team will create the frontend, and its useful to be able to share a big list of all the endpoints, along with how to use them and the expected result that can all be run, as well as handling all the auth for you

[aiven]

OpenAPI also has examples and auth. But, like Postman, it is tied to your service, not some 3rd party.