Apple revealed its intent to enter the healthcare market by adding two new components to iOS: Health, a separate companion app, and HealthKit, a hub for third-party apps related to health and well-being. Health is Apple's own application meant to help iPhone and iPad owners keep track of their health and fitness statistics, such as calories burned, weight fluctuations, and sleep patterns. HealthKit is for developers - who need to be careful about staying on the right side of the law when it comes to the privacy of healthcare information.
The growth of APIs owes a lot of thanks to mobile. The reverse is also true, as APIs make possible much of what happens on mobile devices. Along the way, popular API segments have grown with mobile-specific offerings. Perhaps predictably, mobile payments is one of those areas of hyper growth. The most recent crop of mobile payment APIs focuses on specific platforms much of the time, either in addition to or instead of a more universal RESTful API.