The Polymarket scanner monitors over 1,000 active markets for anomalies: unusual spread widths, sudden volume spikes, rapid price movements, and discrepancies between correlated markets.
The scanner refreshes every 60 seconds. It ranks markets by anomaly score, showing you which markets have the most unusual activity right now. High volume combined with a sharp price move often indicates new information entering the market.
Spread anomalies occur when YES and NO prices for a binary market do not sum to approximately $1.00. These gaps represent potential inefficiencies. The scanner highlights markets where spreads exceed 2%.
Volume spikes detect when a market receives 10x or more its average hourly volume. This often precedes significant price movements and may indicate whale activity or breaking news.