Definition

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Absorb/Sweep

Working definition

A microstructural market dynamic where limit orders (absorption) interact with aggressive market orders (sweeping) across multiple price levels, defining liquidity transition phases.

Two things can happen when aggressive flow meets a resting order book, and the difference decides what an order costs.

In absorption, the limit orders resting at a price level are large enough to take the incoming flow without the level clearing. Trades print, size changes hands, and the touch does not move — or moves and comes straight back. The book is doing the job it exists to do: converting impatience into inventory at a stable price.

In a sweep, the incoming order is larger than the size resting at the touch, so it consumes that level and continues into the next, and the next. Price moves not because opinion changed but because the arithmetic of the order ran out of counterparties. A sweep across several levels is one decision rendered as a price move, which is why it reads as information on a chart and as slippage on a fill.

Most of a session sits somewhere between the two, and the balance shifts with conditions rather than holding fixed. It tips toward sweeping when depth thins ahead of scheduled releases, when market makers widen or withdraw, and in the seconds either side of a liquidity void. It tips toward absorption when replenishment keeps pace with consumption.

The balance is measurable, and measuring it needs the book rather than the chart: top-of-book size over time, the size traded at a level before it clears, how many levels a single aggressive order traverses, and how quickly consumed depth is replaced. All of that is recoverable from a recorded feed; none of it is visible in a candle that compresses the whole exchange into four numbers.

What the distinction is not: a directional signal. Absorption and sweeping describe how a move was executed, not where the next one goes. Reading a sweep as a forecast is a separate claim and needs separate evidence — the two lenses apply here as everywhere.

Commonly confused with

Neighbouring concepts that get used interchangeably, and the distinction that actually separates them.

A directional signal

Absorption and sweeping describe how a move was executed, not where the next one goes. Reading a sweep as a forecast is a separate claim requiring separate evidence — the two lenses apply here as everywhere.

Volume

Volume says how much changed hands; the absorb/sweep balance says what it did to the book. The same volume absorbed at one level and swept across five are opposite events, and a volume bar reports them identically.

Liquidity void

A sweep consumes depth that was there. A void is depth that had already gone. Sweeping tips toward voiding as replenishment fails, which is why the two are usually adjacent in time and are not the same measurement.

Market impact

Impact is the cost your order paid; the absorb/sweep balance is the mechanism that set it. Impact is measured in price, the balance is measured in the book, and understanding the second explains why the first varies so much for identical order sizes.

Liquidity sweep

The chart-level namesake: price trading through a prior extreme and reclaiming it over bars. This entry's sweep is one aggressive order consuming depth levels in a recorded book. The words collide; the instruments, the data and the timescales do not.

How to measure it in your own data

A definition you cannot test is a definition you have to take on trust. This is the shortest honest route from the concept to a number you computed yourself.

Records you need

Recorded order-book data with depth per level over time — not candles, which compress the whole exchange into four numbers and discard exactly the quantity being measured.

What you compute

Top-of-book size over time; the size traded at a level before it clears; how many levels a single aggressive order traverses; and how quickly consumed depth is replaced.

What the answer tells you

Absorption shows as trades printing while the touch holds — or moves and comes straight back — which is the book converting impatience into inventory at a stable price. A sweep shows as one aggressive order traversing several levels, where price moved because the arithmetic of the order ran out of counterparties rather than because opinion changed. The balance tips toward sweeping as depth thins ahead of releases and as makers widen or withdraw.

Questions and answers

Does a sweep mean informed traders are buying?

Not on its own. A sweep tells you an order was larger than the resting size at the touch and continued into the levels behind it. Whether the person sending it knew something is a separate claim requiring separate evidence — the mechanics of an execution and the information behind it are different questions.

Why does the same trade size cost me different amounts?

Because the balance between absorption and sweeping shifts with conditions rather than holding fixed. Into a well-replenished book your order is absorbed at a stable price; into a thinning one the same size traverses several levels. The size did not change; the book did.

Can I see this on a candlestick chart?

No, and that is the practical point. A candle reports four numbers and discards the depth that produced them, so absorption and a sweep of identical volume look the same. The measurement requires a recorded book — top-of-book size over time, levels traversed, replenishment speed.

When does the balance tip toward sweeping?

When depth thins ahead of scheduled releases, when market makers widen or withdraw, and in the seconds either side of a liquidity void. It tips back toward absorption whenever replenishment keeps pace with consumption, which is most of an ordinary session.

Derived from the links this entry makes and the entries that link back to it.

  • Cumulative deltaThe running sum of buyer-aggressed minus seller-aggressed volume — one line tracking which side has been crossing the spread harder, accumulated trade by trade.
  • Delta divergencePrice printing a new extreme that cumulative delta declines to confirm — fresh highs on fading buyer aggression, or fresh lows on fading seller aggression — read as absorption at the extreme.
  • Depth of market (DOM)The visible ladder of resting limit orders — how much size is bid and offered at each price level away from the touch — as one feed displays it at one moment.
  • DisplacementA candle or short run of candles whose bodies dominate their ranges — price delivered aggressively in one direction, with little trade against it, often leaving imbalances behind.
  • Liquidity sweepPrice trading through a prior swing high or low — or a cluster of equal highs or lows — and then closing back inside the old range, read as a run on the stop and entry orders resting beyond the level.
  • Liquidity VoidA moment in which resting orders are withdrawn faster than they are replaced, leaving stretches of the price axis with nothing to trade against, so that price traverses them in near-vertical jumps.
  • Order flowThe stream of orders arriving at a market — aggressive orders consuming resting size and passive orders posting it — and, by extension, the discipline of reading that stream from book and tape data.
  • Order Flow Imbalance (OFI)A measure of net buying pressure constructed from changes at the top of the order book — additions, cancellations and executions on each side, netted over an interval.

Detector datasheets whose concepts include this term, or whose published copy uses it. Each one states the build state it has reached and the parameters it exposes, and carries no measured verdict.

Absorb/Sweep comes up in four research notes on this site, and this entry lists three of them.

  • Do brokers hunt your stop losses?Up-side spread tags run 67% at round numbers against a modelled floor of 77%. The claim that stops are hit more often than chance does not survive it.
  • Do order blocks predict anything?Controlled for recent momentum, the order-block measure added nothing out of sample. It was redundant, not underpowered — and the distinction is the method.
  • Does a wick rejection mean anything?An 8% against 46% split at z = 198, and a volatility-matched surrogate reproduces it at +39% against +38%. The effect is real and means nothing.

Cite This Definition

Hadal Instruments. (2026). Absorb/Sweep. Hadal Glossary. https://hadalinstruments.com/glossary/absorb-sweep/ Version b3b5d99, 2026-08-31.

Version b3b5d99 identifies the commit that last changed this page in Hadal's content repository. That repository is not public, so the identifier does not resolve externally — it is published so a citation pins one specific state rather than a moving page. To obtain the exact version cited, use the press and research route.