EA XO v1.0 Source Code MQ4 is an Expert Advisor (EA) for the MetaTrader 4 (MT4) trading platform, designed for automated trading. The name “XO” may refer to a specific trading strategy or the use of certain technical indicators, but further details depend on the specific version of the EA. As the “v1.0” suggests, this is likely an initial release, and it may evolve over time based on user feedback and performance results.