Enter the two opposite outcomes from any two venues. We tell you if it's a sure bet, the exact stake split, and your guaranteed profit. Either leg can be a sportsbook line or a Polymarket / Kalshi price.
Stakes are sized so the payout is identical whichever outcome hits. Round to the nearest dollar/share when you actually place — and place the leg that can move first.
An arbitrage exists when the implied probabilities of the two opposite outcomes add up to less than 100%. Inside one sportsbook that almost never happens — the vig guarantees it. It shows up between venues that disagree, and the biggest disagreements right now are between sportsbooks and prediction markets, because they have different crowds, fees, and liquidity.
Hunting arbs by hand is slow. ZenHodl's Edge Finder watches Polymarket, Kalshi and sportsbooks side by side against one calibrated fair value — and we publish our closing-line value per sport so you can see the edge is real, not claimed.
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Free tools for sharper betting and prediction-market trading.