URX is an API that allows developers to perform deep linking tactics. This tutorial, posted on URX's developer's site, shows how to use URX to let a user listen to a song using an Android device. The walkthrough will show one how to use the URX Search API to find a deeplink to a specific song or artist in an app like Spotify, which you can then display to your user.
One of the more intriguing aspects of RESTful APIs is that they make all kinds of computing platforms more accessible to developers than previously thought possible. Case in point is the machine learning platform (based on a math engine) that is being developed by Wise.io.