Manual Gird EA v1.0 Source Code MQ4 is an Expert Advisor (EA) designed to implement a grid trading strategy. Grid trading is a type of automated trading system where buy and sell orders are placed at predefined intervals above and below a starting point, creating a “grid” of orders. The idea is to profit from price movements in either direction by capturing the profits from these incremental price changes. This strategy works best in markets with volatility and ranging price action.