Absorption Wall

Absorption Wall is an order flow indicator for footprint charts that detects structural limit order walls — price levels where large passive volume absorbs aggressive trades. To do this, it combines imbalance ratio analysis (the ratio between passive and aggressive volume) with candle anatomy filters.

Absorption Wall is not a standalone buy or sell signal. The indicator's zones and alerts reflect detected order flow patterns — traders use them as part of their own analysis and make trading decisions independently.

What the indicator does

Bid/Ask Imbalance Ratio Engine. The indicator identifies walls not by raw volume alone, but by the ratio between passive (bid or ask) and aggressive volume at each price level. A configurable threshold (e.g., 300%) filters out random volume clusters and keeps only levels with a clear dominance of passive liquidity.

Three-Layer Candle Anatomy Detection. The indicator distinguishes exactly where a wall formed — in the candle's wick (rejection), body, or across the whole candle — filtering out noise and keeping only structurally meaningful absorption.

Stacked Level Confirmation. Instead of single spikes, the indicator looks for several consecutive levels showing wall conditions — filtering out single-tick outliers and keeping genuine multi-level absorption zones.

Precision Proximity Filters. Max Ticks from Extreme limits wall detection to levels near the candle's High/Low, while Min Rejection Ticks sets a minimum wick size — ensuring only genuinely strong rejections are counted.

Automatic S/R Zone Builder. Every confirmed wall instantly becomes a horizontal support or resistance zone. The zone's cut mode (touch, body cross, three touches) and its duration by session or day are configurable.

Real-Time Alerts. The moment a wall is confirmed on a closing bar, the indicator fires a sound and popup alert with a customizable message — direction, volume, price.

Compatible with ATAS Classic and ATAS X. The indicator automatically detects which platform version it's running on and adapts accordingly.

How the indicator finds a wall

Absorption Wall processes each candle's footprint data through a six-step pipeline:

1. Volume threshold. For each price level inside the candle, the indicator checks whether the passive side (Bid for buys, Ask for sells) meets the minimum volume — Min Wall Volume. Anything below the threshold is excluded immediately.
2. Imbalance ratio filter. If enabled, the ratio between passive and aggressive volume is calculated for the level (e.g., Ask ÷ Bid for sell walls). Only levels exceeding the Min Imbalance Ratio pass through.
3. Candle anatomy. Depending on Detection Mode, the level is checked against Shadow rules (wick, near the High/Low, no shorter than a set size) or Body rules (within the Open–Close range).
4. Adjacent level check. Passing levels are sorted by price and checked for adjacency. If Minimum Stacked Levels ≥ 2, only clusters of consecutive qualifying levels count — single-tick outliers are filtered out.
5. Wall rendering. A confirmed wall is displayed as a marker (rectangle, ellipse, etc.), colored by direction — buy green, sell red — with a volume label and size that scales with the absorbed volume.
6. S/R zone projection. The wall becomes a horizontal zone that holds until price "cancels" it per the selected mode (touch, body cross, three touches). The zone can be limited by a number of days or reset at the start of a new session.

Settings

Data: Min Wall Volume · Use Imbalance Ratio (on/off) + Min Imbalance Ratio (%) · Detection Mode (Shadow / Body / All)

Location filters: Max Ticks from Candle Extreme · Min Rejection Ticks · Minimum Stacked Levels

Zones: enable/disable S/R zones · Zone Cut Mode (Touch / Body Cross / Three Touches) · zone height in ticks · Zone Days Limit (0 = unlimited) · reset zones at the start of a new session

Visualization: marker shape · fixed or dynamic size · transparency · volume labels (manual or auto-zoom) · Buy/Sell colors · render above or below candles

Alerts: enable/disable · custom sound file · custom message with placeholders {0} direction, {1} volume, {2} price · popup background color

Example use cases

Wick rejection. Detection Mode is set to Shadow. On ES futures, a bearish candle forms a long upper wick, and Absorption Wall detects heavy Ask absorption near the candle's High (2,500 Ask contracts vs. 50 Bid — a 5000% ratio). The indicator draws a resistance zone. A trader may consider price returning to that zone as one possible short entry option — alongside the rest of their own analysis.

Hidden absorption in the candle body. In Body mode, a bullish candle closes near its high, but heavy Bid absorption occurred mid-body. Absorption Wall marks it as hidden support. A trader may watch for a pullback into that zone as one possible long scenario, confirming it with their own analysis.

Confirmation via multiple levels. With Minimum Stacked Levels = 3, the indicator only flags zones where absorption appears simultaneously on three or more adjacent ticks. On NQ, this confirms a genuine multi-level buy-side absorption zone, noticeably reducing false positives from single-tick outliers.

Session fade. Reset Zones on New Session is enabled. The trader only works with Absorption Wall zones formed within the current session — for example, returning to key absorption levels formed during the morning drive before the lunchtime chop.

Pricing

• Monthly — $24.99/month
• Quarterly — $59.99/3 months — 20% savings vs. paying monthly
• A free 7-day trial with full feature access is available to all new users.