Web APIs are a enterprise's external persona that enable them to connect more easily  with partners, and allow other companies to build businesses on top of the enterprise. WebSphere Cast Iron Live Web API Services provides a complete set of web API capabilities.

• The new Web API allows rapid creation of new APIs from existing business assets or cloud services through configuration.

• You can attract more partners and innovative application developers, both internally and externally.

• The web API services provide capabilities for web API assembly,  securing and scaling web APIs, analytics for business operations, and a developer portal to socialize the APIs. 

You can try out a 90day free trial here http://webapi.castiron.com.