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Market-Trader.de · MT4 · Version 1.10

Bollinger Bands Breakout EA for MT4

The Bollinger Bands Breakout EA trades breaks above the upper or below the lower Bollinger Band and can open both buy and sell positions.

At a glance: Chart symbol and timeframe · Bollinger 100 / 2.0 · buy and sell · 25-pip SL · 75-pip TP · fixed lots or percentage risk · optional trailing stop.
Important before you start: The EA has no time filter. A signal can occur on any tick, so verify the symbol, spread and chart timeframe with your broker.

1. How Bollinger Bands Breakout works

The EA trades the symbol and timeframe of the chart. It looks for breakouts through the upper or lower Bollinger Band.

  1. Upper band: A buy signal occurs when the previous close was below the previous upper band and the current close is above the current upper band.
  2. Lower band: A sell signal occurs when the previous close was above the previous lower band and the current close is below the current lower band.
  3. Position check: A new trade is opened only when there is no existing EA buy or sell order for the same symbol and magic number.
  4. Protection: Stop loss and take profit are placed on entry; an optional trailing stop can manage the position afterwards.

Signals are recalculated on every tick from the current and previous Bollinger values. There is no built-in weekday or clock-time filter.

2. Quick start

  1. Install the EA: Select File → Open Data Folder, place the EA file in MQL4/Experts, then refresh the Navigator.
  2. Choose a chart: Open the desired broker symbol and attach the EA.
  3. Enable trading: Turn on AutoTrading and the EA's trading permission.
  4. Allow the licence connection: Allow WebRequest for https://market-trader.de.
  5. Review parameters: Check times, lot/risk settings, stops, magic number and filters before the first trade.
  6. Test first: Check the strategy in the Strategy Tester and on a demo account with your own broker.

3. Understanding the settings

SettingDefault
Bollinger Bands100 / 2.0
Lot size0.01
Risk0% = fixed lots
Stop loss25 pips
Take profit75 pips
Trailingoff; 25-pip distance / 5-pip step
Show all MT4 inputs
InputDefaultPlain explanation
Input""Heading in the input window; no trading function.
Einstellungen""Settings heading; no trading function.
Kommentar"BollingerBandsBreakout"EA label; the current order-sending routine does not attach this value as a new-order comment.
MagicNr123456Magic number used to identify the EA's own orders.
TradeEnabledtrueMaster switch for new entries.
Risk0.0Percentage of equity used for dynamic sizing. 0 uses fixed LotSize.
LotSize0.01Fixed volume when Risk ≤ 0.
TakeProfit75Take-profit distance in pips.
StopLoss25Stop-loss distance in pips and basis for percentage-risk sizing.
Slippage2Requested price deviation; internally multiplied by 10 on 3/5-digit symbols.
myTrailingStopfalseEnables the optional trailing stop.
TrailingStop25Trailing-stop distance in pips.
TrailingStep5Additional profit threshold: trailing starts only after TrailingStop + TrailingStep pips of profit.
chartanzeigetrueShows or hides chart statistics and licence information.
BandsPeriod100Bollinger Bands period.
BandsDeviation2.0Bollinger Bands standard-deviation multiplier.

Fixed lots or percentage risk

With Risk=0, the EA uses LotSize. A positive value derives a risk amount from current equity and the stop distance. The result is capped to the broker's minimum and maximum volume.

Risk amount = equity × Risk ÷ 100
Lot size ≈ risk amount ÷ (StopLoss × tick value), then broker limits are applied

4. Signal timing and chart timeframe

There is no fixed trading time. The EA reacts on every tick and uses Bollinger Bands from the current chart timeframe, so a signal can occur at any market time.

Because the current bar (shift 0) is part of the breakout test, the signal can change while the bar is still forming.

5. Position protection and identification

  • Stop loss / take profit: calculated as pip distances from the entry.
  • Trailing stop: below Bid for buys and above Ask for sells, and only moved in the favourable direction.
  • Trailing trigger: starts only after at least TrailingStop + TrailingStep pips of profit.
  • Identification: symbol and MagicNr determine which orders the EA manages.

6. Activation and support

The EA uses the new Market-Trader account-based licensing system. There is no licence key to enter inside the EA.

  1. Allow WebRequest: In MetaTrader, open Tools → Options → Expert Advisors and allow https://market-trader.de.
  2. Start the EA: Attach it to the desired chart. The trading account and product slug are sent automatically to the licence server.
  3. Check the status: VALID allows new trades. If the licence is invalid, new entries remain blocked while existing positions may continue to be managed.

The Strategy Tester and optimisation use TEST MODE. For account activation issues, contact Market-Trader support.

7. Frequently asked questions

Why does the EA not open a trade?

Check the licence, AutoTrading, TradeEnabled, sufficient history (at least 60 bars), broker trading permission and whether an EA position with the same magic number is already open.

Which timeframe is used?

The EA always uses the timeframe of the chart it is attached to.

Can Risk be set to 0?

Yes. The EA then uses the fixed LotSize.

Bollinger Bands Breakout EA · MT4 · Version 1.10 · Updated: 5 October 2026

Risk notice: Trading leveraged instruments can cause substantial losses. Profits are not guaranteed. Defaults are not personal risk recommendations. Check the EA and its settings in the Strategy Tester and on a demo account first.

Get Bollinger Bands Breakout EA MT4