PolySensei
verifiedFreepolysensei.com
Free browser overlay for Polymarket that surfaces whale-flow, smart-money, and fair-value signals to help traders size and time positions.
What it does
PolySensei is a non-custodial browser extension that layers extra trading signals directly onto Polymarket's own pages, rather than replacing the site. It shows live whale trade flow, the win-rate track record of top holders on each side of a market, a fair-value/edge calculator, order-book depth, and alerts for markets that may resolve on UMA disputes. It targets active prediction-market traders wanting an information edge without extra cost or a separate app.
Core features
Live whale trade flow tracking per market
Smart-money leaderboard showing top holders' historical win rates
Entry calculator for fill price, slippage, and Kelly-optimal stake sizing
Order-book depth visualization with resting-wall detection
Live sports scores, odds, and crypto price context alongside markets
Resolution-risk countdown flagging UMA-dispute exposure
Best for
→Active Polymarket traders wanting whale and smart-money visibility
→Traders sizing positions with slippage and edge calculations
→Users tracking markets at risk of ambiguous UMA resolution
→People following top-performing prediction-market holders