RESTful services that underpin many Web APIs today should follow design patterns that make any Web API a good Web API. Such design patterns are all about respecting HTTP protocol specifications, respecting good URI design principles, or taking the full advantage of underlying Web infrastructure for Web API's good performance and scalability. If you are interested in such practices or in a cutting-edge research that may impact the future of Web APIs developments, you should look into the series of workshops on RESTful Design.
eHive, online collection management system, grants access to its web-based organization system via the eHive API. Museums can integrate the API with third party applications, or developers can build mobile and custom apps that leverage eHive technology. eHive allows museums and curators to gather, share, and manage collections of all flavors and sizes directly through a web interface. API integration enables eHive users to gain traction through mobile, social, and existing networks.