StrikeIron Web Services Marketplace API

The StrikeIron Web Services Marketplace provides online services for selling (publishing) and buying (subscribing to) commercial Web services from multiple providers. Developers can start making money instantly by integrating their applications with multiple Web services from the StrikeIron Marketplace to be seamlessly integrated on-the-fly without ever having to leave their application. This free API includes functionality such as registering a new user to the Marketplace, providing free trials in real-time to desired Web services, providing on-demand usage information, and creating customized WSDLs for each Web service in the Marketplace for usage tracking and providing transaction-based commissions to the partner. And best of all, StrikeIron takes care of all the Web services commercialization infrastructure and process, minimizing the effort and cost so the partner can focus on selling their applications.

http://www.strikeiron.com/partners/isv.aspx