APB Channel EA — Heikin-Ashi reversal with channel confirmation and swing-structure stops - MetaTrader 4のためのエキスパート

APB Channel EA . Heikin-Ashi reversal + Keltner channel trigger (XAUUSD / XAGUSD)

How it works

The EA runs its full logic once per closed bar, in five stages.

1. Signal — the colour flip Heikin-Ashi bars are recalculated on each new bar. When a bar's colour changes relative to the previous bar (bearish → bullish, or bullish → bearish), the EA registers a directional arrow and arms a pending signal. Heikin-Ashi averaging smooths out the noise that causes raw candles to flip back and forth in choppy conditions, so reversals are marked with fewer false alarms.

2. Trigger — channel re-entry An arrow alone does not open a trade. The EA then waits for price to close back inside or through a Keltner-style channel (EMA ± ATR × multiplier) in the arrow's direction:

• Buy: a bar must close at or above the lower band
• Sell: a bar must close at or below the upper band

• 

  This is the core filter of the system. It stops the EA from buying into a falling knife the moment a single bar changes colour, and instead waits for price to demonstrate it has actually returned into the value area. If the trigger does not occur within MaxBarsToTrigger bars, the pending signal expires and is discarded (set to 0 to wait indefinitely).

3. Filters Before any order is sent, three independent filters must all pass:

• Time window — only trade between TradeStartHour and TradeEndHour (server time; correctly handles windows that wrap past midnight). An optional Friday cut-off hour avoids the thin weekend close.
• Liquidity — the signal bar's tick volume must be at least MinVolumeRatio × the recent average, which keeps the EA out of dead, gappy sessions.
• Large-candle / volatility — if ATR exceeds MaxATRPips , entries are skipped. This blocks entries during news spikes where stops are unreliable and spreads widen.

4. Order placement Lot size is calculated from the distance between entry and stop, so the monetary risk stays constant regardless of how wide the structural stop happens to be. Take profit is placed at RR_Ratio × the risk distance (1.5 by default). The EA validates the stop distance against the broker's StopLevel before sending, so you get a clear log message instead of a silent error 130.

5. Trade management

• Stop loss is placed beyond the lowest low (for buys) or highest high (for sells) of the last SwingLookbackBars closed bars, plus a configurable buffer — a real structural invalidation point rather than an arbitrary fixed distance.
• Break-even moves the stop to entry plus a small lock once price has covered BreakEvenTriggerPct of the distance to target.
• Exit occurs at the 1.5R take profit, at the stop, or immediately on an opposite-direction arrow — whichever comes first. The opposite-signal exit does not wait for that new signal's own channel trigger; it closes as soon as the reversal is detected.

Only one position is held at a time per symbol and magic number.

Inputs

Signal and channel

Input	Default	Meaning
HeikinAshiBars	60	Lookback recomputed each new bar
Channel_MA_Period	20	EMA period for the channel midline
Channel_ATR_Period	20	ATR period for channel width
Channel_Multiplier	1.5	Band distance = ATR × this
MaxBarsToTrigger	15	Bars to wait for the trigger; 0 = wait indefinitely

Risk and targets

Input	Default	Meaning
RiskMode	RISK_PERCENT	Risk as % of balance, or a fixed cash amount
RiskValue	1.0	Percent or currency amount, per RiskMode
RR_Ratio	1.5	Take profit as a multiple of risk
UseInitialStopLoss	true	Send a hard stop to the broker
SLMethod	SL_SWING_STRUCTURE	Swing-based or ATR-based stop
SwingLookbackBars	10	Bars scanned for the swing low/high
SL_BufferPips	20	Extra room beyond the swing point
FixedLots	0.01	Fallback if the risk calculation fails

Break-even

Input	Default	Meaning
UseBreakEven	true	Enable break-even management
BreakEvenTriggerPct	50	% of TP distance before the stop moves
BreakEvenLockPips	2	Pips locked beyond entry

Filters and general

Input	Default	Meaning
UseTimeFilter / TradeStartHour / TradeEndHour	true / 7 / 21	Session window, server time
AvoidFridayLateSession / FridayCutoffHour	true / 20	Skip the Friday close
UseLiquidityFilter / MinVolumeRatio	true / 0.5	Minimum tick volume vs average
UseLargeCandleFilter / MaxATRPips	true / 100	Skip abnormally volatile conditions
CloseOnOppositeSignal	true	Close on a reversal arrow
PointsPerPip	10	10 for 3/5-digit quotes, 1 for 2/4-digit
DebugLog	true	Print decision diagnostics to the Journal

Setup notes

Set PointsPerPip correctly for your broker before anything else — it drives every pip-based input (stop buffer, break-even lock, ATR filter). Use 10 if XAUUSD is quoted with 3 decimals (3450.500) and 1 if it shows 2 decimals (3450.50). Getting this wrong will make your stops ten times too wide or too narrow.

TradeStartHour and TradeEndHour are in broker server time, not your local time. Check your broker's server offset before setting the session window.

With DebugLog enabled, the Journal shows exactly why each bar did or did not produce a trade — arrow detection, trigger evaluation, which filter blocked an entry, and the result of every OrderSend . Turn it off for long optimisation runs.

Tuning suggestions

• SwingLookbackBars should roughly match your typical swing size on the timeframe you trade. Shallower pullbacks call for 5–7; wider structure calls for 12–15. A lookback that is too long produces distant stops and small position sizes.
• Channel_Multiplier controls how deep a retracement is required before entry. Larger values mean fewer but more selective entries.
• If you get very few trades, MaxBarsToTrigger is the first thing to relax — signals may be expiring before price returns to the channel.

Notes and limitations

This EA is published as a working, readable starting point rather than a finished commercial system. It ships with no optimised parameter set, and the defaults are sensible starting values, not tested edges.

Test it in the Strategy Tester on your own broker's data and then forward-test on a demo account before risking real capital. Results vary considerably between brokers because of differences in spread, swap, quote precision and server time. A reversal system of this type will naturally underperform during strong sustained trends, when colour flips generate repeated counter-trend entries — the channel trigger reduces this but does not eliminate it.

Feedback and improvements are welcome.

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Credits / originality statement

All signal logic in this EA is original and built from publicly documented techniques: Heikin-Ashi bar averaging and a Keltner-style EMA/ATR channel. It is not derived from, and does not reproduce, any commercial or licence-protected indicator. The EA has no external indicator dependencies and calls no DLLs.