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Tampa Bay Rays vs. Baltimore Orioles: O/U 8.5

Post
KalshiPolymarket Closes Aug 22, 2026
MarketMaster fair value55¢ vs live 54¢ on Polymarket
▲ +1.3% edge · Buy NO
Trade on Polymarket ↗
LIVE PRICES — YES
KalshiBEST YES PRICETrade ↗
44¢ last
BidAsk
YES43¢44¢
NO56¢57¢
$31,986 volume
PolymarketTrade ↗
46¢ last
BidAsk
YES44¢45¢
NO55¢56¢
$28,424 volume
Cross-venue spread 2.0¢· active arbitrage window
30-DAY PRICE HISTORY
HOW THIS RESOLVES

Kalshi — primary rule

If Tampa Bay and Baltimore collectively score more 8.5 runs in the Tampa Bay vs Baltimore professional baseball game originally scheduled for Aug 21, 2026 at 7:15 PM EDT, then the market resolves to Yes.

Polymarket — resolution criteria

In the upcoming MLB game between the Tampa Bay Rays and Baltimore Orioles, scheduled for August 21 at 7:15 PM ET: This market will resolve to "Over" if the Tampa Bay Rays and Baltimore Orioles combine to score 9 or more runs in this game. If the combined total is less than 9, this market will resolve to "Under". 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, this market will resolve 50-50. To know when a postponed game will be played, please check the home team's schedule on MLB.com for the listed team and look for the game described as a makeup game. 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.

Show full rules
STATS
Cross-venue spread2.0¢
Kalshi last44¢
Polymarket last46¢
Model fair value45¢
Model confidence44%
Venues2
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