The Alpha Vantage Java SDK by Patrik Nygren allows you to deploy the Java language when building real time financial apps using the Alpha Vintage API. The API’s access requires an API key available through a URL provided in the SDK documentation.
Our API directory now includes 180 finance APIs. The newest is the TTAGG Stock API. The most popular, in terms of mashups, is the PayPal API. We list 33 PayPal mashups. Below you'll find some more stats from the directory, including the entire list of finance APIs.