EMA Crossover + Trend Filter Overview An overlay indicator that plots three Exponential Moving Averages on the price chart and marks buy/sell signals when the fast EMA crosses the slow EMA. A long-term EMA can optionally act as a trend filter, so signals only fire in the direction of the prevailing trend. Signal logic BUY triggers when the fast EMA crosses above the slow EMA and the close is above the trend EMA. SELL triggers when the fast EMA crosses below the slow EMA and the close is below