IoT announcements are routinely void of any discussion about developers or open APIs. It's as if the so-called IoT industry is destined to repeat the proprietary mistakes of its technology predecessors even when it's surrounded by current examples of the industry's commoditizing forces at work.
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.