The Mobpartner API allows this global affiliate marketing platform to monetize you unfilled traffic in over 200 countries. Working with advertisers, marketers and publishers, Mobpartner has both REST and S2S HTTP APIs. Mobpartner uses as CPA model that allows for CPS, CPL and CPI actions. Responses are XML, JSON and XHTML, or directly through an XML feed.
With Lemonade Stand, users can search for things to buy in a location-based manner, or add their own listings of things they wish to sell. The application is currently available as a client for Android, with a possible Windows Phone 7 version on the way soon as well, from a 3rd party developer that released an early version. Its Lemonade Stand API allows other developers to either code their own clients or use it in mashups.