Forex Hacked EA v2.5 Source Code MQ4 is an Expert Advisor (EA) for MetaTrader 4 (MT4) that is typically used for automated trading in the Forex market. This EA is well-known for being an aggressive grid trading system, often combined with a martingale strategy. It can open multiple trades at different levels and adjust position sizes in an attempt to recover losses. While it can potentially yield profits in trending markets, it also comes with significant risks, especially during periods of market consolidation or sharp reversals.