Like in [this other thread][1] I would use "in the internet" in the context of **A** pplication **P** rogramming **I** nterfaces, because they pull information, which has a sense of depth. This is opposed to websites, which push information, not necessarily having the sense of depth.


  [1]: http://english.stackexchange.com/questions/82867/do-you-say-content-is-in-a-website-or-on-a-website