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The Arbitrage Scanner continuously compares Kalshi and Polymarket, hunting for the same real-world outcome priced differently on each venue. When the two prices disagree enough, buying the cheap side on one venue and the opposite side on the other can lock in a profit no matter what happens. Open it with / → ARB. Arbitrage scanner listing cross-venue opportunities ranked by profit

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How an arb works

Suppose the same question trades at Yes 21¢ on Kalshi while Polymarket implies No 4¢ (Yes ≈ 96¢). Buying Kalshi-Yes and Polymarket-No costs 25¢ combined — but exactly one of those contracts must pay out $1.00 at resolution. That’s a 75¢ gross profit per pair, whatever the outcome. The scanner finds these pairs for you and does the math.

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Reading the table

Set your stake at the top and the scanner sizes everything to your number. Use the Prediction Markets / Sports tabs to switch between cross-venue prediction arbs and sportsbook arbs, and the sort controls to rank by profit, expiry, match quality, or volume.

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Before you pull the trigger

Huge profit percentages usually come with a catch. Work through this checklist:
  1. Read both markets’ resolution rules. A high Sim score helps, but only you can confirm the two markets resolve on identical terms. “Before the July meeting” ≠ “at the July meeting.”
  2. Check the volume. A 1000% arb with $3K of depth is a small opportunity, not a big one.
  3. Mind the timeline. Your cash is locked until resolution — a 40% return that takes 3 years is very different from one that pays Friday.
  4. Move fast on stable arbs. The Stab column shows persistence; fresh spikes often vanish in seconds.

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Acting on an opportunity

Click through a row to open the market on each venue, then place the two legs from the order slip. Both venues trade from the same Panther balance — see Adding funds.
True arbitrage needs funds on both venues, since you’re buying a leg on each.