The Google Shopping Content Objective-C Library by Google can access API data to sell products on Google, list ads, drive traffic, and increase sales. Developers can interact with the JSON API, working with iOS 3+ and Mac OS X 10.5+. Available introduction and example applications.
eBay completely revamped its API portfolio to create a seamless experience across the eBay developer experience. The launch includes 10 APIs in total, on both the buy and sell side. The APIs replace some legacy APIs and include a number of completely new features for enhanced integration.
Customer service-driven company Zappos, which first launched its developer program in June, is showing it's still focused on its Zappos API. The platform for platform shoes has been hard at work on a new version, according to Zappos' Will Young, though developers won't notice much difference quite yet.