There is no shortage of great tools out there to help you get in shape and keep track of your progress. You may be familiar with Nike's Nike+ system, that is heavily integrated with the iOS platform. It offers a great deal of data, but if you're like me, it wasn't enough to really rave about. Helpful, yes. Impressive, potentially. But FitBit, with its new FitBit API, has the potential to be much more.
HopStop announced to its developer community and posted on its website that it will discontinue its free API model. HopStop's announcement shouldn't shock API junkies as HopStop joins an ever growing list of free API gone pay-to-play (i.e. Bing, Google Maps, etc.). Instead, HopStop's move should make us consider business models surrounding an API offering.