ABC Harmonic Pattern Indicator MT4 + MT5

The ABC Harmonic Pattern Indicator detects the three-leg ABC structure – origin A, reaction B, and completion C after a healthy retracement of the AB leg. Also, when the BC retracement falls inside the valid band the indicator draws the A-B-C zigzag and prints a BUY arrow (C at a low) or SELL arrow (C at a high). ABC is the simplest harmonic and a useful building block for the larger patterns.

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What the Abc Harmonic Pattern Indicator does on the chart

Also, the ABC Harmonic Pattern Indicator identifies the three-leg ABC structure from fractal swing pivots. Also, still, point A is the origin, B is the first reaction, and C is the completion after a healthy retracement of the AB leg. A valid ABC requires the BC retracement to fall within a sensible band (roughly 38.2% to 88.6% of AB).

When the pattern completes at point C the indicator prints a BUY arrow (C at a swing low) or a SELL arrow (C at a swing high) and draws the A-B-C zigzag. Thus, ABC is the simplest harmonic and a useful building block for the larger patterns.

Key features and settings

• Detects the three-leg ABC harmonic structure
• Validates the BC retracement of the AB leg
• Draws the A-B-C zigzag on the chart
• BUY / SELL arrow at the C completion point
• Configurable swing depth
• Full alert system: popup, push notification to mobile MetaTrader, email, and sound — all four channels toggle independently from the inputs panel. Alerts fire once per closed bar so you never get spammed mid-tick.
• Built for both MT4 and MT5; works on every timeframe and every symbol your broker offers.
• Lightweight code that does not slow down the chart.

Setting	Description	Default
Depth	Fractal depth used to detect the A/B/C swing pivots	4
Tolerance	Reserved length tolerance input	0.20
ArrowOffsetPoints	Arrow offset from the C-point wick	45
EnableAlerts	Master toggle for the alert system	true
EnablePopup	MT4/MT5 popup dialog on signal	true
EnablePushNotify	Mobile push notification (configure MetaQuotes ID first)	false
EnableEmail	SMTP email (configure Tools -> Options -> Email)	false
EnableSound	Play .wav from MT4/Sounds on signal	false

How to read signals from the Abc Harmonic Pattern Indicator

The arrow marks point C. Also, still, hence, the BC retracement filter keeps shallow, low-quality setups out.

Entry idea (long). Wait for a BUY arrow at C (a swing low). Next, stop below C; target the A level.

Entry idea (short). Wait for a SELL arrow at C (a swing high). Stop above C.

Exit idea. Many traders target the prior swing that defined point A.

Tuning the ABC Harmonic Pattern Indicator inputs

Start with the defaults, then tune for your market. Depth (default 4) tunes how the calculation behaves; Tolerance (default 0.2) tunes how the calculation behaves. Then, every alert channel — pop-up, sound, email and mobile push — toggles independently in the same inputs panel, and alerts fire once per closed bar.

Recommended timeframes and instruments

In practice, this indicator needs room for structure to form, so favour the higher timeframes.

• H1 and H4 for reliable, tradable structures.
• Daily for the cleanest patterns and levels.

Below H1 you get frequent, lower-quality structures. Thus, yet, it works best on the majors and XAUUSD where swings are well defined.

How to install on MT4 and MT5

Installation is the same for every indicator on this site. Also, hence, truly, unzip the download, copy the compiled .ex4 into your MT4 MQL4/Indicators folder (or the .ex5 into MT5 MQL5/Indicators), refresh the Navigator, then drag it onto the chart. For the full step-by-step with alert setup and troubleshooting, see our guide to installing MT4 and MT5 indicators.

Best practices and tips

• Wait for the pattern to complete and confirm with price action before acting.
• Add a momentum check so you are not catching a falling knife.
• Wait for the bar to close before acting on a signal.
• Backtest your configuration on at least 200 closed bars before trading live.
• Keep position sizing small while you learn how the tool behaves on your instrument.
• Review your results weekly and prune settings that underperform.

Get the ABC Harmonic Pattern for MT4 and MT5

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Built by forexmt4systems.com

This It is one of 1,383 free MT4, MT5 and TradingView indicators we publish and maintain. Also, every tool ships with ready-to-use compiled MT4 (.ex4) and MT5 (.ex5) files, a 4-channel alert system (popup + mobile push + email + sound), and is loaded on EURUSD H1 before release to confirm it draws cleanly without repainting. The same one-step email opt-in below unlocks the entire library – not just this one indicator.

FAQ

What does the ABC Harmonic Pattern measure?

It plots a clear signal layer that the ABC Harmonic Pattern computes from recent price and volume on the chart.

Is the indicator non-repaint?

By default the indicator only confirms a signal on the bar close, so the printed signal locks in once that bar closes. Then, some users prefer the early intra-bar mode for faster signals — both options are in the inputs.

Which timeframe should I use?

There is no single best timeframe. Also, still, yet, still, m15 to H1 is a common starting point for intraday traders, and H4 to D1 works for swing traders. Backtest the configuration on the timeframe you actually trade.

Does it work on instruments other than forex?

It works on any instrument MT4 and MT5 supports — forex majors, gold (XAUUSD), indices like US30 and NAS100, and major cryptos. Thus, fast-moving instruments may need a smaller period setting.

Can I add alerts?

Yes. Thus, truly, hence, Pop-up, sound, push, and email alerts live in the inputs panel. On MT4 and MT5 the alert plays on the bar close that triggers the signal. Next, this indicator ships with full alert functionality built in: popup alerts on the chart, push notifications to mobile MetaTrader, email alerts, and a sound alert with a configurable .wav file. you toggle each channel independently from the inputs panel (EnableAlerts, EnablePopup, EnablePushNotify, EnableEmail, EnableSound). Alerts trigger once per closed bar.

For external background reading, see the background on volatility envelopes. Are results guaranteed?
No. Trading involves risk. Results are not guaranteed. Past performance is not indicative of future results. Use the tool as one input. Always backtest before trading live.