Orderbook Pressure
Orderbook pressure compares resting buy depth against sell depth around the mid price. When bids materially outweigh asks, small market sells get absorbed while market buys move price — a measurable short-term tailwind.
How Pressure Is Measured
The basic metric is depth imbalance: sum bid quantity within some band of mid (0.5%, 1%, 2%), divide by the equivalent ask quantity. Ratios far from 1.0 indicate one-sided resting liquidity.
Band choice matters. Imbalance within 0.1% of mid predicts the next ticks; imbalance within 2% describes the structural liquidity a large order would meet. Serious measurement tracks several bands at once.
Pressure is a fast-decaying signal: books re-quote in milliseconds. Its practical use for humans is context — knowing whether a breakout is pushing into thick or thin opposition.
Why Visible Depth Lies
Spoofing places large orders with no intention to fill, precisely to manufacture apparent pressure. Iceberg orders do the opposite — real size hidden behind small visible clips. Both mean raw depth snapshots overstate what will actually trade.
The robust read combines the book with tape: pressure that holds while actually absorbing market orders is real; pressure that vanishes on approach was theater.
Key Points
Bid depth ÷ ask depth within a price band. Above ~1.5 or below ~0.67 marks meaningful imbalance on liquid pairs.
Real pressure absorbs incoming market orders; spoofed pressure cancels as price approaches. The tape validates the book.
Low absolute depth on both sides matters more than imbalance: it is the precondition for violent moves and liquidation cascades.
FAQ
At horizons of seconds to minutes, yes — depth imbalance measurably tilts the next move. At longer horizons the signal decays quickly as books re-quote.
Because visible depth is strategic: spoofing inflates it and icebergs hide real size. Confirm any book signal against executed trades.