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Fxscalper Strategy

Bollinger Band breakout scalping strategy translated from the MQL4 "fxscalper" expert. The strategy subscribes to candle data and Bollinger Bands. When the closing price breaks above the upper band it opens a long position; when the closing price breaks below the lower band it opens a short position. Positions are protected by stop-loss and take-profit levels.

Details

  • Entry Criteria:
    • Long: Close > Upper Band
    • Short: Close < Lower Band
  • Long/Short: Both
  • Exit Criteria: Opposite signal or protective stops
  • Stops: Stop loss and take profit
  • Default Values:
    • CandleType = TimeSpan.FromMinutes(5).TimeFrame()
    • BollingerPeriod = 20
    • BollingerDeviation = 2
    • StopLoss = 200m
    • TakeProfit = 150m
  • Filters:
    • Category: Bollinger Bands
    • Direction: Both
    • Indicators: Bollinger Bands
    • Stops: Yes
    • Complexity: Basic
    • Timeframe: Intraday
    • Seasonality: No
    • Neural Networks: No
    • Divergence: No
    • Risk Level: Medium
using System;
using System.Collections.Generic;

using Ecng.Common;

using StockSharp.Algo.Indicators;
using StockSharp.Algo.Strategies;
using StockSharp.BusinessEntities;
using StockSharp.Messages;

namespace StockSharp.Samples.Strategies;

/// <summary>
/// Bollinger Band breakout scalping strategy.
/// </summary>
public class FxscalperStrategy : Strategy
{
	private readonly StrategyParam<int> _bollingerPeriod;
	private readonly StrategyParam<decimal> _bollingerDeviation;
	private readonly StrategyParam<DataType> _candleType;

	private decimal _entryPrice;

	public int BollingerPeriod { get => _bollingerPeriod.Value; set => _bollingerPeriod.Value = value; }
	public decimal BollingerDeviation { get => _bollingerDeviation.Value; set => _bollingerDeviation.Value = value; }
	public DataType CandleType { get => _candleType.Value; set => _candleType.Value = value; }

	public FxscalperStrategy()
	{
		_bollingerPeriod = Param(nameof(BollingerPeriod), 20)
			.SetGreaterThanZero()
			.SetDisplay("BB Period", "Bollinger Bands length", "Indicators");

		_bollingerDeviation = Param(nameof(BollingerDeviation), 2m)
			.SetGreaterThanZero()
			.SetDisplay("BB Width", "Bollinger Bands width", "Indicators");

		_candleType = Param(nameof(CandleType), TimeSpan.FromHours(4).TimeFrame())
			.SetDisplay("Candle Type", "Candle Type", "General");
	}

	/// <inheritdoc />
	public override IEnumerable<(Security sec, DataType dt)> GetWorkingSecurities()
		=> [(Security, CandleType)];

	/// <inheritdoc />
	protected override void OnReseted()
	{
		base.OnReseted();
		_entryPrice = 0;
	}

	/// <inheritdoc />
	protected override void OnStarted2(DateTime time)
	{
		base.OnStarted2(time);

		var bollinger = new BollingerBands { Length = BollingerPeriod, Width = BollingerDeviation };

		var subscription = SubscribeCandles(CandleType);
		subscription.BindEx(bollinger, ProcessCandle).Start();

		var area = CreateChartArea();
		if (area != null)
		{
			DrawCandles(area, subscription);
			DrawIndicator(area, bollinger);
			DrawOwnTrades(area);
		}
	}

	private void ProcessCandle(ICandleMessage candle, IIndicatorValue bbValue)
	{
		if (candle.State != CandleStates.Finished)
			return;

		var bb = (BollingerBandsValue)bbValue;
		if (bb.UpBand is not decimal upper ||
			bb.LowBand is not decimal lower ||
			bb.MovingAverage is not decimal middle)
			return;

		if (candle.ClosePrice > upper && Position <= 0)
		{
			BuyMarket();
			_entryPrice = candle.ClosePrice;
		}
		else if (candle.ClosePrice < lower && Position >= 0)
		{
			SellMarket();
			_entryPrice = candle.ClosePrice;
		}

		// Mean reversion exit: close when price returns to middle band
		if (Position > 0 && candle.ClosePrice <= middle)
			SellMarket();
		else if (Position < 0 && candle.ClosePrice >= middle)
			BuyMarket();
	}
}