API Testing framework

I am looking for a way to test our APIs. Our APIs are C# MVC but all our front end tests are in Jasmine / Karma and ran from Gulp / Node.

Ideally any solution we come up with would use Jasmine / Karma or be fairly similar. It would also ideally be on the simpler side to write as I was hoping a test engineer would be able to write and maintain these tests.

Is there anything better to use than Jasmine and Karma? One problem I can foresee is that sometimes we'll want to test our production APIs, sometimes our local (staging) ones. The point being that the endpoint will likely change but the machine running the tests may not, which may incur CORS issues if being done using javascript / web browser.

Can anyone offer some advice?