The Groupon Java Library by Jessica Chung interacts with the API, that allows to build Groupon applications. Developers can improve, add extensions, and create multiple platform interfaces considering groups of clients who want to find the best deals nearby. Groupon official site offers an API developer forum.
Thread Genius recently launched with the goal of mapping the world's visual taste. Thread Genius believes that web recommendations based on text fall short of capturing consumers' true taste. Its computer vision technology captures taste on visual input. Its API opens the service to others.
Blippy and Swipely both launched fairly recently with the hopes of making spending a social experience. Both services are very similar in that they both allow you to connect your bank and credit card info, as well as other accounts like iTunes and Amazon. After you've set everything up, as you start spending, you have the option to share these purchases with everyone. And now you can extend that sharing with the Blippy API.
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.