XINS is a technology used to define, create and invoke remote APIs. XINS is specification-oriented. When API specifications are written (in XML), XINS will transform them to HTML-based documentation and Java code for both the client- and the server-side. The communication is based on HTTP.

XINS competes with the overcomplex SOAP technology. Main design goals include simplicity, scalability and testability.

XINS is not only a specification technology, but also an application development framework. It offers transaction logging, unique log documentation and active code generation.