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.
It is not uncommon for e-shoppers to create a cart on a website without the intention of making an immediate purchase. The motives behind abandoning a cart can vary; what matters is how companies take advantage of the information that can be gained with each cart that is left behind. Rejoiner is a company that helps online retailers capture, analyze and recover abandoned shopping carts. The company accomplishes this with their Rejoiner API.
It's often said that in New York City everything comes down to real estate. The tenth API to emerge from the New York Times developer network addresses this topic with pricing data for the five borough's residential properties.