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.
Everybody likes money, but nobody likes the inconvenience of having to visit different sites to manage all their accounts. Redwood City-based Yodlee has been aggregating financial data for its MoneyCenter users and partner companies since 1999, and is now expanding its developer services to include "Accelerator" and "Incubator" programs, both of which augment its existing API offerings.
Our API directory now includes 46 bitcoin APIs. The newest is the Btc.to API. The most popular, in terms of page visits, is the BitStamp API. Below you'll find some more stats from the directory, including the entire list of bitcoin APIs.