So many of the cooler services out there have have free APIs. The data from those APIs can add considerable value to your application. Using these APIs can vary in complexity quite a bit. I have implemented a lot of these recently, and thought I would share the Yelp REST API version 1.
Yelp gives out developer keys for free. All you have to do is navigate to here and create an account, verify your email, and request an API key. When you do, you’re going to want your APP v1.0 key. A key looks like this: grwU5qatvNzGcbCR8ODWfg – but you will need your own to use the API in your application.