Jasmine Martingale EA v1.0 source Code MQ5 for MetaTrader 5 (MT5) refers to an Expert Advisor (EA) built using the Martingale strategy. The Martingale strategy is a betting system that involves doubling the position size after each loss to recover previous losses with a single winning trade. It is popular in trading, especially in forex and binary options, due to its high-risk, high-reward potential.