The USAePay Java Library provides a Java interface for running server to server processing. The Library is for developing websites using Java using the client side method, which provides a stable UI. This library is written in Java.
Stronghold has released a set of APIs that developers can use to add to apps a variety of payment instruments including Bitcoin, Ethereum, and Lumens. The APIs also allow apps to leverage Stronghold platform capabilities such as generate quotes, trade cryptocurrencies, and get available venues.