Is Toxic Order Flow Building Up?
When traders with real information move, they hit one side of the book hard, and market makers who absorb that flow lose money until they widen out or step away. VPIN measures exactly that pressure: how one-sided recent volume is, in volume time rather than clock time. Readings in the top decile have historically clustered before volatility spikes and liquidation cascades.
Bitcoin's VPIN is currently 0.116, higher than 21% of readings from the last 90 days. Flow is balanced: nothing unusual in the tape.
How toxic is flow right now?
Each point is one volume bucket, so busy hours produce more points than quiet ones. The dashed line marks the 90th percentile of the last 90 days: readings above it are the historically dangerous zone.
Do toxicity spikes line up with price breaks?
Daily average VPIN against price. The pattern to look for: toxicity rising while price still looks calm, which is how informed positioning often shows up before the move itself.
Methodology and honest caveats
VPIN (Volume-Synchronized Probability of Informed Trading, Easley, Lopez de Prado and O'Hara) slices the tape into equal-volume buckets, 50 per average day, and measures how one-sided taker volume is inside each: |buy - sell| / bucket. The published number is the average of the last 50 buckets, so it spans roughly one average day of volume.
We compute it from minute bars with true taker buy/sell splits from the perpetual futures tape, not the bulk classification approximation the original paper had to use. History runs 120 days and grows daily; the series refreshes hourly.
One honest caveat: VPIN says nothing about direction. It flags that informed, one-sided flow is present, not which way price resolves. Academic debate about its predictive power is real; we publish it as a monitoring gauge alongside the liquidation map, not as a signal.
What does 'toxic' order flow mean?
Flow is toxic from a market maker's point of view when the people trading against them know something they do not. The market maker keeps buying from informed sellers (or selling to informed buyers) and bleeds money until they widen spreads or pull quotes, which is exactly when markets get thin and moves get violent.
Why should I care about VPIN?
Because liquidity tends to vanish when VPIN is extreme. The metric became famous after researchers showed it climbed to unusual levels in the hours before the 2010 flash crash. In crypto, one-sided informed flow often precedes liquidation cascades: pair this radar with our liquidation map to see where the fuel sits.
Is a high VPIN bullish or bearish?
Neither. It measures how one-sided volume is, not which side wins. Treat it as a storm warning: risk of a violent move is elevated, position sizing and stops matter more than usual, and the direction usually reveals itself at the liquidation levels.
How fresh is this data?
The taker-signed minute bars refresh hourly, and each VPIN reading closes when its volume bucket fills, so in busy markets readings arrive faster than in quiet ones. The page notes the timestamp of the last bar it has seen.