Swing Trader EA v1.0 Source Code MQ4 for MetaTrader 4 (MT4) is likely an Expert Advisor (EA) designed to automate swing trading strategies. Swing trading involves taking advantage of price "swings" or trends in the market, typically over a period of several days or weeks. The goal is to enter trades at the beginning of a price move (swing) and exit once the price has moved sufficiently in the desired direction.