Where Kalshi and Polymarket disagree, right now.
Every market both exchanges list, priced side by side.
$0.25 buys a contract that pays $1 if it happens, a 25% chance. Gap = the price difference between the venues. Edge = what is left of $1 after buying both sides across venues, fees paid, as a percent. Thin = a spread over $0.10. Tap a line for every outcome and the price history.
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How to read it
Each line is one event priced on both exchanges, matched outcome by outcome and refreshed every 45 seconds. The track shows where each venue puts the favorite, Kalshi in teal, Polymarket in violet, and the price difference between them. A price is dollars on a contract that pays $1 if the outcome happens, so $0.62 is a 62% chance. Expand a line for every outcome, the edge after fees, and the price history.
Edge after fees
Buy one side on one venue and the other side on the other, both at the ask. Edge is $1 minus total cost minus taker fees, Kalshi ⌈0.07·P·(1−P)⌉ per contract and Polymarket 0.05·P·(1−P) on sports, shown as a percent of the $1 payout. Resting orders on Kalshi sports markets are free, so real edges can be better than shown.
What this is not
Read-only. Nothing here places or routes orders and nothing is advice. Polymarket prices come from the live order book, Kalshi from its public API. Thin books and near-certain favorites are hidden by default because their gaps are rounding, not disagreement. Links to the exchanges may be referral links; that never affects what is shown. Full disclosures.