is a collection of Java libraries and tools dealing with the Financial Information Exchange protocol (FIX), an "electronic communications protocol initiated in 1992 for international real-time exchange of information related to the securities transactions and markets" (source:

All our projects are available on github:


fix4j-assert is an open source library designed to assist in testing of applications using FIX protocol. (homepage) (github)


fix4j-fixpad is a simple GUI which allows you to view fix messages in a human readable format. (github)


NOTE: This project has moved to fix4j-assert.