Samsung and the Tizen Association recently made the Tizen Software Development Kit for Wearables available from the Tizen developer web site. The SDK supports any wearable running Samsung's Tizen operating system, but that's an extremely limited number of devices at the moment, with just the Samsung Gear 2 and Gear 2 Neo smartwatches filling the space.
Have a look at the APIs that peaked the interest of developers, readers, and our own researchers. APIs were chosen according to web traffic, social media mentions, picks from our API directory research team, and hot categories. These interesting APIs were all added to our directory during 2017.