This type of service is used to the place where client needs fast development and secure interaction. We have implemented so many WCF services and created even wrapper custom service which clients actually using to sell it further.
When client wants a multi-device service platform, we use this to interact a single portfolio for pc, ipad and mobile application. We are also having experience on making hybrid phone applications which uses this kind of data
This is useful when client want to create an api service which they need to build fast and stable. It could be from a single function to thousand of modules integrated. We prepare some of the renowned web api services which are commercially very successful to our clients.