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.
Diffbot, a startup known for its data mining services, released a new API that will scan an e-commerce shopping page and parse information on a particular product. Developers can use the API in their web and mobile apps to find the best price on different sites, track merchandise availability or even migrate shopping sites to new platforms without having to deal with backend integration.
Our API directory now includes 116 retail APIs. The newest is the Leaf API. The most popular, in terms of mashups, is the Shopping.com API. We list 60 Shopping.com mashups. Below you'll find some more stats from the directory, including the entire list of retail APIs.