Enter the two opposite outcomes from any two venues. We tell you whether the prices cross, the exact stake split, and the P&L if both legs fill at the prices you entered. Either leg can be a sportsbook line or a Polymarket / Kalshi price. Our published MLB snapshot study found quoted crossings in 0.36–0.39% of its June 21–23, 2026 samples. Those sampled quotes do not establish that both legs could have filled.
The split equalizes payout under the entered assumptions. Rounding, stake limits, one-sided fills and different settlement rules can change the result. This calculator does not place orders.
The calculator tests whether the two effective implied probabilities sum to less than 100%, then divides the stake to equalize the payouts. This requires two exhaustive, mutually exclusive outcomes with matching settlement rules. A sampled price difference does not verify executable size or simultaneous fills.
ZenHodl's Edge Finder compares available venue prices against model probabilities. A model-price gap is a different measurement from a two-leg arbitrage calculation. Our per-sport CLV scorecard publishes the observed result—including negative values—without claiming that this one measure proves an edge.
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