The C# (.NET) library for Windows is for use with the Bloomberg API. The Bloomberg API provides free, unrestricted access to raw financial data and is 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 file, documentation, and programming examples. Extensive documentation, including code examples, is available in the Developer Documentation and at the API website.
After it was revealed that over 143 million Americans may have been impacted when their personally identifiable information may have been breached through the credit reporting agency Equifax, there were further revelations that the so-called secret PINs issued by Equifax were actually timestamps.
A few weeks ago we reported on the release of the Kiva API, which provides access to the Kiva.org global microlending database. Not long after the API's release, blog posts from Bill Zimmerman and the Kiva team report that several developers are already working on Kiva mashups:
Business models were nascent in 2005, when ProgrammableWeb listed only 105 APIs in our directory. There were only four basic models, according to John Musser's talk this morning at Glue. Fast forward six years and those same business models exist, but there's a lot more detail, as the now 3,000+ APIs have refined the ways an API can make money.