Persistent Orderbook Depth Compression on Major Venues
Pattern definition:
A sustained reduction in visible orderbook depth (measured as cumulative size within X ticks from mid) combined with narrower quoted spreads and rising irregularity of large market orders indicates that displayed liquidity is fragile.
For AUCTION, this pattern tends to precede sudden price dislocations because market participants cannot execute large flow without moving price significantly.
How to measure:
- Compute cumulative depth on both sides within ±0.5% and ±1% of mid across top N exchanges and normalize by average daily traded volume to get depth ratio.
- Monitor spread-normalized depth = depth / spread to factor in quote tightness.
- Track the number and size of executed block trades and the ratio of market orders to limit orders over rolling windows (e.g., 1d, 7d).
- Flag compression when depth ratio drops below its 20th percentile while spread-normalized depth also declines and block trades increase.
Operational use:
A flagged compression is a liquidity risk signal — prefer reducing trade size, widening execution algorithms, or using TWAP/POV; market-makers should widen quotes or withdraw until depth recovers.
Trade implications:
Short-term higher slippage and potential spikes contra to prevailing funding flows; directional bets face higher tail-risk.
Failure modes:
Hidden liquidity (iceberg orders) or sudden provision from new market makers can restore normal conditions without a price event; conversely, off-exchange liquidity (OTC desks) can absorb flows and mute on-exchange impact.
Combine with funding rate and exchange flow signals for confirmation.