Summary: Gold Volatility Guard EA is an MQL4 expert advisor for XAUUSD that uses MACD trend filter, multi-tier position scaling (max 3 positions), and equity-based stop loss management. Suitable for H4 timeframe stable operation.




Gold Volatility Guard EA is engineered specifically for XAUUSD with a focus on capital preservation. Unlike aggressive grid systems, this EA employs a disciplined trend-following approach with MACD(12,26,9) confirming trend direction and EMA cross validation. The EA uses a multi-tier position system where each additional tier must meet stricter entry conditions. An equity-based trailing stop protects profits while allowing trend continuation. The EA includes daily loss limits, spread filters, and Friday close mechanisms.

Recommended Timeframe: H4
Trading Logic:
  • Trend Detection: MACD main line above signal line for uptrend; below for downtrend. EMA(20) and EMA(50) cross for additional confirmation.

  • Entry Signal: Price retraces to EMA(50) and closes beyond it in trend direction, with MACD momentum confirmation.

  • Multi-Tier Scaling: Additional positions allowed only when existing position is profitable by 1.5x ATR (max 3 total).

  • Risk Management: ATR-based dynamic stop loss, equity-based trailing, daily loss limit 5%.


    • ``mql4
    //+------------------------------------------------------------------+
    //| GoldVolatilityGuardEA.mq4 |
    //+------------------------------------------------------------------+
    #property copyright ""
    #property link ""
    #property version "1.00"
    #property strict

    //--- input parameters with comments
    input double BaseLotSize = 0.01; // Base lot size for first position
    input int FastEMAPeriod = 20; // Fast EMA period for trend confirmation
    input int SlowEMAPeriod = 50; // Slow EMA period for trend filter
    input int MACDFast = 12; // MACD fast EMA period
    input int MACDSlow = 26; // MACD slow EMA period
    input int MACDSignal = 9; // MACD signal line period
    input int ATRPeriod = 14; // ATR period for volatility
    input double ATRStopMultiplier = 1.5; // Stop loss as multiple of ATR
    input double ATRTakeMultiplier = 2.8; // Take profit as multiple of ATR
    input double TierProfitThreshold = 1.5; // Profit required (x ATR) to add next tier
    input int MaxTiers = 3; // Maximum number of position tiers
    input double TrailingStart = 0.8; // Trailing activates at profit (x ATR)
    input double TrailingStep = 0.4; // Trailing step (x ATR)
    input int MagicNumber = 202421; // Unique EA identifier
    input int MaxSpread = 35; // Maximum allowed spread in points
    input double DailyLossLimit = 5.0; // Daily loss limit as percentage
    input bool UseFridayClose = true; // Close trades before Friday 21:00 GMT

    //--- global variables
    double dailyStartBalance = 0;
    datetime lastBarTime = 0;
    bool fridayCloseExecuted = false;
    double avgATR = 0;
    int currentTier = 0;

    //+------------------------------------------------------------------+
    //| Expert initialization function |
    //+------------------------------------------------------------------+
    int OnInit()
    {
    dailyStartBalance = AccountBalance();
    lastBarTime = 0;
    fridayCloseExecuted = false;
    avgATR = iATR(Symbol(), PERIOD_H4, ATRPeriod, 1);
    if(avgATR <= 0) avgATR = 250 Point;
    return(INIT_SUCCEEDED);
    }

    //+------------------------------------------------------------------+
    //| Expert deinitialization function |
    //+------------------------------------------------------------------+
    void OnDeinit(const int reason)
    {
    Comment("");
    }

    //+------------------------------------------------------------------+
    //| Get MACD trend direction |
    //+------------------------------------------------------------------+
    int GetMACDTrend()
    {
    double macdMain = iMACD(Symbol(), PERIOD_H4, MACDFast, MACDSlow, MACDSignal, PRICE_CLOSE, MODE_MAIN, 1);
    double macdSignal = iMACD(Symbol(), PERIOD_H4, MACDFast, MACDSlow, MACDSignal, PRICE_CLOSE, MODE_SIGNAL, 1);
    double macdHist = macdMain - macdSignal;

    if(macdHist > 0) return 1; // Bullish
    if(macdHist < 0) return -1; // Bearish
    return 0;
    }

    //+------------------------------------------------------------------+
    //| Check EMA alignment |
    //+------------------------------------------------------------------+
    int GetEMAAlignment()
    {
    double emaFast = iMA(Symbol(), PERIOD_H4, FastEMAPeriod, 0, MODE_EMA, PRICE_CLOSE, 1);
    double emaSlow = iMA(Symbol(), PERIOD_H4, SlowEMAPeriod, 0, MODE_EMA, PRICE_CLOSE, 1);
    double close = iClose(Symbol(), PERIOD_H4, 1);

    bool bullish = (close > emaSlow && emaFast > emaSlow);
    bool bearish = (close < emaSlow && emaFast < emaSlow);

    if(bullish) return 1;
    if(bearish) return -1;
    return 0;
    }

    //+------------------------------------------------------------------+
    //| Calculate current tier count for this EA |
    //+------------------------------------------------------------------+
    int GetCurrentTierCount()
    {
    int count = 0;
    for(int i = OrdersTotal()-1; i >= 0; i--)
    {
    if(OrderSelect(i, SELECT_BY_POS, MODE_TRADES))
    {
    if(OrderSymbol() == Symbol() && OrderMagicNumber() == MagicNumber)
    count++;
    }
    }
    return count;
    }

    //+------------------------------------------------------------------+
    //| Get average profit per position (in points) |
    //+------------------------------------------------------------------+
    double GetAverageProfitInATR(double atr)
    {
    if(atr <= 0) return 0;

    double totalProfitPoints = 0;
    int count = 0;

    for(int i = OrdersTotal()-1; i >= 0; i--)
    {
    if(OrderSelect(i, SELECT_BY_POS, MODE_TRADES))
    {
    if(OrderSymbol() == Symbol() && OrderMagicNumber() == MagicNumber)
    {
    double profitPoints = 0;
    if(OrderType() == OP_BUY)
    profitPoints = (Bid - OrderOpenPrice()) / Point;
    else if(OrderType() == OP_SELL)
    profitPoints = (OrderOpenPrice() - Ask) / Point;

    totalProfitPoints += profitPoints;
    count++;
    }
    }
    }

    if(count == 0) return 0;
    return (totalProfitPoints / count)     Point;
    }

    //+------------------------------------------------------------------+
    //| Check if we can add another tier |
    //+------------------------------------------------------------------+
    bool CanAddTier(double atr)
    {
    int currentCount = GetCurrentTierCount();
    if(currentCount >= MaxTiers) return false;
    if(currentCount == 0) return true;

    double avgProfit = GetAverageProfitInATR(atr);
    double requiredProfit = atr TierProfitThreshold;

    return (avgProfit >= requiredProfit);
    }

    //+------------------------------------------------------------------+
    //| Check pullback entry condition |
    //+------------------------------------------------------------------+
    bool CheckPullbackEntry(int direction, double &entryPrice, double &sl, double &tp, double atr)
    {
    double emaSlow = iMA(Symbol(), PERIOD_H4, SlowEMAPeriod, 0, MODE_EMA, PRICE_CLOSE, 1);
    double close1 = iClose(Symbol(), PERIOD_H4, 1);
    double open1 = iOpen(Symbol(), PERIOD_H4, 1);
    double low1 = iLow(Symbol(), PERIOD_H4, 1);
    double high1 = iHigh(Symbol(), PERIOD_H4, 1);

    if(direction == 1) // Long: pullback to EMA50 then close above
    {
    bool pulledToEMA = (low1 <= emaSlow && close1 > emaSlow);
    bool bullishClose = (close1 > open1);
    bool belowPreviousHigh = (high1 < iHigh(Symbol(), PERIOD_H4, 2));

    if(pulledToEMA && bullishClose && belowPreviousHigh)
    {
    entryPrice = Ask;
    sl = entryPrice - (atr     ATRStopMultiplier);
    tp = entryPrice + (atr ATRTakeMultiplier);
    return true;
    }
    }
    else if(direction == -1) // Short: pullback to EMA50 then close below
    {
    bool pulledToEMA = (high1 >= emaSlow && close1 < emaSlow);
    bool bearishClose = (close1 < open1);
    bool abovePreviousLow = (low1 > iLow(Symbol(), PERIOD_H4, 2));

    if(pulledToEMA && bearishClose && abovePreviousLow)
    {
    entryPrice = Bid;
    sl = entryPrice + (atr     ATRStopMultiplier);
    tp = entryPrice - (atr ATRTakeMultiplier);
    return true;
    }
    }
    return false;
    }

    //+------------------------------------------------------------------+
    //| Manage trailing stop for all positions |
    //+------------------------------------------------------------------+
    void ManageTrailingStop(double atr)
    {
    if(atr <= 0) atr = avgATR;
    double activate = atr     TrailingStart;
    double step = atr TrailingStep;

    for(int i = OrdersTotal()-1; i >= 0; i--)
    {
    if(OrderSelect(i, SELECT_BY_POS, MODE_TRADES))
    {
    if(OrderSymbol() == Symbol() && OrderMagicNumber() == MagicNumber)
    {
    double newSL = 0;
    if(OrderType() == OP_BUY)
    {
    double profit = Bid - OrderOpenPrice();
    if(profit >= activate)
    {
    newSL = Bid - step;
    if(newSL > OrderStopLoss())
    OrderModify(OrderTicket(), OrderOpenPrice(), newSL, OrderTakeProfit(), 0, clrNONE);
    }
    }
    else if(OrderType() == OP_SELL)
    {
    double profit = OrderOpenPrice() - Ask;
    if(profit >= activate)
    {
    newSL = Ask + step;
    if(newSL < OrderStopLoss() || OrderStopLoss() == 0)
    OrderModify(OrderTicket(), OrderOpenPrice(), newSL, OrderTakeProfit(), 0, clrNONE);
    }
    }
    }
    }
    }
    }

    //+------------------------------------------------------------------+
    //| Calculate lot size for new tier |
    //+------------------------------------------------------------------+
    double GetTierLotSize()
    {
    int tier = GetCurrentTierCount();
    if(tier == 0) return BaseLotSize;
    return NormalizeDouble(BaseLotSize     (1.0 + tier 0.2), 2); // Slight increase but controlled
    }

    //+------------------------------------------------------------------+
    //| Expert tick function |
    //+------------------------------------------------------------------+
    void OnTick()
    {
    // Daily equity protection
    double currentEquity = AccountEquity();
    double lossPercent = (dailyStartBalance - currentEquity) / dailyStartBalance     100;
    if(lossPercent >= DailyLossLimit)
    {
    Comment("Daily loss limit reached. No new trades.");
    return;
    }

    // Friday close before weekend
    if(UseFridayClose && !fridayCloseExecuted)
    {
    datetime currentTime = TimeCurrent();
    if(TimeDayOfWeek(currentTime) == 5 && TimeHour(currentTime) >= 21)
    {
    CloseAllOrders();
    fridayCloseExecuted = true;
    return;
    }
    if(TimeDayOfWeek(currentTime) != 5)
    fridayCloseExecuted = false;
    }

    // Spread filter
    if(MarketInfo(Symbol(), MODE_SPREAD) > MaxSpread)
    {
    Comment("Spread too high: ", MarketInfo(Symbol(), MODE_SPREAD));
    return;
    }

    // New bar logic (H4)
    if(Time[0] == lastBarTime)
    return;
    lastBarTime = Time[0];

    // Get ATR for volatility
    double atr = iATR(Symbol(), PERIOD_H4, ATRPeriod, 1);
    if(atr > 0) avgATR = (avgATR 0.95) + (atr 0.05);

    // Volatility guard
    if(atr > avgATR * 1.7 && avgATR > 0)
    {
    Comment("Volatility too high. ATR: ", atr);
    return;
    }

    // Manage existing positions (trailing stop)
    int posCount = GetCurrentTierCount();
    if(posCount > 0)
    {
    ManageTrailingStop(atr);
    }

    // Check trend direction
    int macdTrend = GetMACDTrend();
    int emaAlign = GetEMAAlignment();

    if(macdTrend == 0 || emaAlign == 0 || macdTrend != emaAlign)
    {
    Comment("Trend not aligned. MACD: ", macdTrend, " EMA: ", emaAlign);
    return;
    }

    // Check if we can add a new tier
    if(!CanAddTier(atr))
    {
    Comment("Cannot add tier. Profit threshold not met.");
    return;
    }

    // Check entry condition
    double entryPrice = 0, sl = 0, tp = 0;
    if(CheckPullbackEntry(macdTrend, entryPrice, sl, tp, atr))
    {
    double lotSize = GetTierLotSize();
    int cmd = (macdTrend == 1) ? OP_BUY : OP_SELL;
    int ticket = OrderSend(Symbol(), cmd, lotSize, entryPrice, 5, sl, tp, "Volatility Guard", MagicNumber, 0, clrNONE);
    if(ticket < 0)
    Print("OrderSend failed: ", GetLastError());
    else
    Print("Tier ", GetCurrentTierCount(), " opened. Direction: ", cmd==OP_BUY?"BUY":"SELL");
    }
    }

    //+------------------------------------------------------------------+
    //| Close all orders for this symbol and magic |
    //+------------------------------------------------------------------+
    void CloseAllOrders()
    {
    for(int i = OrdersTotal()-1; i >= 0; i--)
    {
    if(OrderSelect(i, SELECT_BY_POS, MODE_TRADES))
    {
    if(OrderSymbol() == Symbol() && OrderMagicNumber() == MagicNumber)
    {
    if(OrderType() == OP_BUY)
    OrderClose(OrderTicket(), OrderLots(), Bid, 5, clrNONE);
    else if(OrderType() == OP_SELL)
    OrderClose(OrderTicket(), OrderLots(), Ask, 5, clrNONE);
    }
    }
    }
    }
    //+------------------------------------------------------------------+
    ``
    Reference: Original MQL4 code inspired by institutional trend-following principles for XAUUSD .
    Disclaimer: Gold trading involves significant risk due to high volatility and leverage. This EA is provided as-is without any guarantee of profit. Test thoroughly on a demo account before live deployment. Past performance does not guarantee future results.