Kalshi vs Polymarket: Odds, Prices and the Best Payout

Why their odds differ

Kalshi and Polymarket run separate order books with different traders, fees and liquidity. That means the implied probability on the same outcome can sit a few points apart at the same moment. Polymarket often runs cheaper on mid-range prices and charges no trading fee on most markets; Kalshi is the regulated US venue with deep coverage of North American sports. Neither is reliably sharper, so the best price flips market to market.

How to find the best payout

The edge is line shopping: take the highest available number on every bet. Instead of guessing whether Kalshi or Polymarket leads on a given game, OpenMarkets compares them side by side, adds ProphetX, BettorEdge, BetOpenly, SX Bet and more, and marks the best price on each side. Pick a live game below to see it in action.

MLB: live Kalshi vs Polymarket prices

NFL: live Kalshi vs Polymarket prices

WNBA: live Kalshi vs Polymarket prices

FAQ

Do Kalshi and Polymarket have the same odds?

Not usually. They are independent markets with separate order books, so the same game often carries a different price on each at the same moment. Neither is consistently sharper, which is exactly why comparing them pays off.

Which has better payouts, Kalshi or Polymarket?

It depends on the specific market and moment. On some sides Kalshi is cheaper, on others Polymarket is. The only way to know is to compare them side by side, which is what OpenMarkets does, including ProphetX, BettorEdge, BetOpenly, SX Bet and more.

Can I compare Kalshi and Polymarket odds in one place?

Yes. OpenMarkets shows live prices from Kalshi, Polymarket, ProphetX, BettorEdge, BetOpenly, SX Bet and more in a single view and marks the best price on each side, so you always take the highest payout.