PolySensei

PolySensei is a free Chrome extension that adds a layer of professional-grade data to Polymarket, the prediction-market exchange. Rather than replacing Polymarket, it embeds into the same page: your theme, the same charts, the same buy button — but with whale flow, smart-money positioning, true slippage, fair value and full order-book depth layered on top the moment a market loads.

The signals are computed live from public Polymarket and on-chain data. Whale flow comes from the global trade feed, so net big-money buying shows up before the price moves. Smart money scores every wallet on an outcome by how many of its past markets resolved in its favour. True fills come from Polymarket's own CLOB order book, so slippage and resting walls are measured rather than guessed, and fair value compares a model price against the market price to express your edge in cents. On sports markets it also pulls live scores and vig-stripped Vegas lines, and it flags markets that resolve on UMA so you trade resolution risk knowingly.

The extension is non-custodial: you sign every order in your own wallet, and no account, signup or email is required. It charges no added fees — you pay exactly what you would trading directly on Polymarket — and it may earn through Polymarket's builder program on routed volume. A gamified Sensei Points system with belt ranks adds status and perks inside the app, with no cash value and no token.