Wishpot typically brings "lists" to mind. With Wishpot's original service, users could create a single wish list from multiple sites. The service eliminated the need for a new list for every site in which a shopper was interested. Wishpot has now expanded the wish list experience into a full shopping experience with a new API framework that provides true social commerce (shopping/browsing through checkout from the same platform).
PayPal has officially released PayPal X, its next generation platform that includes a variety of APIs and other resources for developers. Primarily aimed at allowing developers to embed payment processing in a wider array of applications and environments, this is a major expansion of PayPal's APIs.