Если это RESTful HTTP API, особенно разновидность HATEOAS, то вы можете использовать Spring rest-shell
https://github.com/spring-projects/rest-shell
Пример использования:
http://localhost:8080:> discover
rel href
========================================================
address http://localhost:8080/address
family http://localhost:8080/family
people http://localhost:8080/person
profile http://localhost:8080/profile
http://localhost:8080:> follow people
http://localhost:8080/person:> list
rel href
===================================================
people.Person http://localhost:8080/person/1
people.Person http://localhost:8080/person/2
people.search http://localhost:8080/person/search
http://localhost:8080/person:> get 1
...