Footprint chart
Also called: number bars · cluster chart · bid/ask footprint
A footprint chart opens each candle to show the volume executed at the bid and at the ask, price by price. It reveals which side crossed the spread inside the bar — information a standard candle discards. It shows aggression, not intention, and never on its own.
What the numbers mean
Each cell holds two figures at one price: volume executed at the bid (an aggressive seller hit a resting buyer) and volume executed at the ask (an aggressive buyer lifted a resting offer). The convention is universal even when the layout differs between platforms.
On CME instruments the exchange itself tags the aggressor side, so these numbers are close to exact. On venues without that tag, the side is inferred from where the trade printed relative to the quote — a reconstruction that is right most of the time and silently wrong the rest.
Imbalances are read diagonally
This is the part most often taught wrong. You do not compare the bid and the ask at the same price: those are not two sides of one confrontation. You compare the ask at price P with the bid at the price one tick below, because those are the two sides that actually met.
A common threshold is 3:1. Three or more consecutive imbalances stacked in the same direction carry more weight than an isolated one, which is usually noise.
What it is for
Two things above all: seeing absorption — heavy aggression producing no displacement — and seeing exhaustion, where aggression simply dries up. Both are invisible on a candle chart, and both are readings rather than signals.
A worked example
In a synthetic six-bar ES sequence, selling accelerates: the bars print deltas of −309, then −1 002, then −3 223. The third is more than three times worse than the one before it.
And yet price touches 5 306.00 on that bar and goes no lower. The following bars print +566, +401 and +264, and the level is retested once and holds. The most negative delta of the sequence marks its floor — which is exactly the opposite of what the number alone suggests.
The trap
Reading delta as direction. A large negative delta means aggressive sellers dominated the volume; it says nothing about who won. The bar above is the case in point: the heaviest selling of the sequence produced the low.
What informs is the gap between effort and result — heavy aggression with no displacement. That comparison requires the price action beside the numbers, which is why a footprint reading taken from the numbers alone is worse than no reading at all.
Frequently asked
- Do I need a footprint chart to trade order flow?
- No. It is one instrument among several, and it is the one that requires the most expensive data. The underlying mechanics — aggression, passive liquidity, acceptance — can be learned without it, and plenty of order flow work is done from a profile and a tape.
- What is a good imbalance ratio?
- 3:1 is the usual default, with a minimum volume filter so that 3 against 1 does not count. The exact number matters far less than applying it consistently, and than ignoring isolated imbalances in favour of stacked ones.
- Is footprint data the same on crypto as on futures?
- Structurally yes, in quality no. CME instruments carry an exchange-provided aggressor flag. Most crypto venues do not, so the side is inferred, and the delta you read is an estimate with an error rate rather than a measurement.