The C/C++ library for Linux is for use with the Bloomberg API. The Bloomberg API provides free, unrestricted access to raw financial data on current market trades (either real-time or delayed), reference data on historical information, and records of intraday trading. As part of their Open Market Data Initiative the library is offered under a "free-use" license, which allows unrestricted access to the interface's header files, documentation, and programming examples. Extensive documentation, including code examples, is available in the Developer Documentation and at the API website. Note that the Linux libraries can only be used with the Bloomberg Server API and B-Pipe data feed products, and are not available for desktop API users.
Dwolla, highly innovative payment network, celebrates its second anniversary by hosting a hackathon in its birthplace: Des Moines, Iowa. To complement the unusual choice of geography for a hackathon, Dwolla chose a name to fit the occasion: Old MacDonald Hackathon. Dwolla and co-host, Silicon Prairie News, aim for 50 developers to enjoy the scene and conjure up some disruptive applications utilizing Dwolla's APIs.
One of the questions that I am most frequently asked regarding content APIs is "how can I make money with my API?" Before answering that question, however, it is important to ask for whom the API is designed. After all, the audiences for your API will determine what business opportunities exist.