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Boston Red Sox vs. Baltimore Orioles: O/U 8.5

Post
KalshiPolymarket ✓ Verified same-resolution Closes Sep 6, 2026
MarketMaster fair value45¢ vs live 44¢ on Kalshi
1.3% against the midpoint, 0.8% against the 44¢ ask you would actually pay.
▲ +0.8% at the ask · Buy YES
Trade on Kalshi ↗
LIVE PRICES — YES
KalshiBEST YES PRICETrade ↗
43¢ last
BidAsk
YES43¢44¢
NO56¢57¢
$24,673 volume
PolymarketTrade ↗
46¢ last
BidAsk
YES43¢44¢
NO56¢57¢
$15,352 volume
Cross-venue spread 3.0¢· active arbitrage window
30-DAY PRICE HISTORY
HOW THIS RESOLVES

Kalshi — primary rule

If Boston and Baltimore collectively score more 8.5 runs in the Boston vs Baltimore professional baseball game originally scheduled for Sep 5, 2026 at 7:05 PM EDT, then the market resolves to Yes.

Polymarket — resolution criteria

In the upcoming MLB game between the Boston Red Sox and Baltimore Orioles, scheduled for September 5 at 7:05 PM ET: This market will resolve to "Over" if the Boston Red Sox 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 spread3.0¢
Kalshi last43¢
Polymarket last46¢
Model fair value45¢
Model confidence42%
Venues2
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The same question at a different strike, deadline or outcome — related, not the same contract. Prices are the latest YES.