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. This library, for use with Windows OS, allows users to interface with the API from within Java. As part of their Open Market Data Initiative both the API and library are offered under a "free-use" license, which allows unrestricted access to the interface's header files, along with documentation and programming examples. Extensive documentation, including code examples, is available in the Developer Documentation and at the API website.
More than ever, websites are seeking out revenue opportunities. And for services that provide value, customers are willing to pay. However, if creating an e-commerce system is too much distraction for your development team, try to get yourself in on the Chargify beta.
Open Banking has launched two API specifications; Accounts and Transaction Information and Payments Initiation. These API specifications will allow banking customers and small business to share their financial data with third-party applications, and will be live from January next year.