Designing a Market-Maker Circuit Breaker for Toxic Order Flow
On 22 August 2026, BTCUSDT fell 2.3% in 15 minutes on Binance. A Polymarket "BTC Up or Down" market repriced within seconds: "Up" traded at 0.49–0.63 just before Binance crossed the window's opening price at 05:07:12 and near 0.10 forty seconds later. Over a 60-day sample, VPIN gave no warning of this sweep and only a weak statistical edge overall (a 1.4x lift). One-sided taker flow reacted first, and the decision window on both venues was seconds, which argues for a circuit breaker that reacts to live microstructure rather than one that tries to predict.
Correction, 2 October 2026: An earlier version said Polymarket lagged Binance by about a minute. That came from lining up Polymarket's one-minute price history, whose points are stamped a few seconds after each minute, with the wrong Binance bar. Polymarket's trade-by-trade record shows it repriced within seconds.
Why Market Makers Need a Circuit Breaker
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