Left number = aggressive buys, right = aggressive sells at each price. Bold cells are 3:1 diagonal imbalances; bands are stacked zones (solid while unbroken); outlined cell = column POC; dots = unfinished auction. Footer: total · delta · delta min/max (— for the combined view) · exchanges. The latest column stays faded until every exchange has reported.
UNI footprint, latest minute: 9 price levels, delta −$4,914 on $74,245 traded across 5 exchanges.
The Uniswap (UNI) footprint chart breaks each candle open to show who traded at every price. Each column is one minute (or a 5- or 15-minute group) of perpetual futures trades, and each row is one price tick: the left number is the notional lifted from the ask (aggressive buying), the right number is the notional hit into the bid (aggressive selling). The column footer sums total volume, delta (buy minus sell), the minute's delta range and how many exchanges contributed, while the delta ladder on the right stacks the same numbers across the visible window so a crowded price level stands out at a glance.
Order flow is read in contrast, not in isolation. A diagonal imbalance — buying at one price far heavier than selling one tick below — shows an aggressor winning a level; three or more in a row form a stacked zone that often acts as support or resistance until price trades back through it. The point of control (the heaviest row, outlined) and an unfinished auction at a column's extreme (both sides still active at the high or low) hint where UNI may revisit. Switch between the combined view and a single exchange to see whether Binance, Bybit, OKX, Bitget and Gate agree on where the aggressive flow is.
A footprint chart is a candle opened up into a grid: time runs left to right in columns and price runs top to bottom in rows, and every cell shows how much UNI was bought and sold at that exact price during that minute. Instead of only open, high, low and close, you see which side was aggressive at each level, the net delta of the column and where the volume concentrated.
An imbalance compares diagonally: buying at a price is marked when it is at least three times the selling one tick below it, and selling is marked when it is at least three times the buying one tick above it; cells without a traded neighbour are skipped. Three or more consecutive imbalances on the same side form a stacked zone, drawn as a horizontal band that extends to the right until a later column trades through the whole band.
Each exchange records UNI trades at its own price step, so the combined view can only be as fine as the coarsest step among the five venues. When the steps differ, every exchange's rows are regrouped onto the largest tick before being summed, which keeps the buy and sell totals exact but shows fewer, thicker rows than a single-exchange view.
Columns can be shown per minute or grouped into 5- and 15-minute bars, and the price axis can be coarsened by 2x, 5x or 10x the native tick. The chart keeps a rolling window of the latest few hours and refreshes every ten seconds while the live toggle is on; the most recent column is drawn faded until all exchanges have reported it.