Live prediction market odds for Boston Red Sox vs. Kansas City Royals (7:40 PM ET). Compare prices across Kalshi and Polymarket.
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Kalshi / Polymarket
2026-05-18
Boston Red Sox vs. Kansas City Royals (7:40 PM ET) — MLB game scheduled for 2026-05-18. Compare live prediction market odds from Kalshi, Polymarket, and more on Prediction Hunt.
Kansas City Royals leads the “Boston Red Sox vs. Kansas City Royals (7:40 PM ET)” event at 53.0% implied probability, followed by Boston Red Sox at 45.8%. A 8.0% cross-platform spread signals an active arbitrage window.
Boston Red Sox vs. Kansas City Royals (7:40 PM ET) is a prediction market event currently tracked across 2 platforms (Kalshi, Polymarket). Kansas City Royals leads at 53% implied probability, making it the market favorite. Other contenders include Boston Red Sox at 46%.
Kansas City Royals currently leads at 53% implied probability. Behind Kansas City Royals, Boston Red Sox at 46% are the next closest contenders. The 8.0% cross-platform spread suggested platforms were pricing new information differently, creating potential trading opportunities.
Here are the latest odds across Kalshi, Polymarket: Kansas City Royals: 49¢ on Kalshi, 57¢ on Polymarket. Boston Red Sox: 49¢ on Kalshi, 43¢ on Polymarket. The 8.0% spread across platforms highlights where markets disagree — a gap traders can exploit by buying low on one platform and selling high on another.
A price of 53¢ means the market estimates a 53% probability that Kansas City Royals will be the outcome. Buying one share at 53¢ pays out $1.00 if correct — a 89% return — or $0 if wrong. This is the core mechanic of prediction markets: the price directly reflects the crowd's probability estimate.
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Official settlement criteria, resolution sources, and edge cases across Kalshi and Polymarket.
KalshiIf Kansas City wins the Boston vs Kansas City professional baseball game originally scheduled for May 18, 2026 at 7:40 PM EDT, then the market resolves to Yes.
The following market refers to the Boston vs Kansas City professional baseball game originally scheduled for May 18, 2026 at 7:40 PM EDT. If this game is postponed or delayed, the market will remain open and close after the rescheduled game has finished (within two days). If the game is cancelled or rescheduled to over two days away, the market will resolve to a fair price in accordance with the rules.
PolymarketIn the upcoming MLB game between the Boston Red Sox and Kansas City Royals, scheduled for May 18 at 7:40PM ET: This market will resolve to "Boston Red Sox" if the Boston Red Sox win the game. This market will resolve to "Kansas City Royals" if the Kansas City Royals win the game. If the game is postponed, this market will remain open until the game has been completed. If the game is canceled entirely, with no make-up game, or ends in a tie, this market will resolve 50-50. The primary resolution source for this market is the official final statistics of the event as recognized by the governing body or event organizers. However, if the governing body or event organizers have not published final match statistics within 24 hours after the event's conclusion, a consensus of credible reporting may be used instead.
Kansas City Royals
53.0% avg
