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Boston Red Sox vs. Tampa Bay Rays: O/U 6.5

Post
KalshiPolymarket ✓ Verified same-resolution Closes Sep 19, 2026
This market group is no longer actively tracked — final data shown. See live edges →
LIVE PRICES — YES
KalshiTrade ↗
95¢ last
BidAsk
YES91¢92¢
NO
$23,886 volume
PolymarketBEST YES PRICETrade ↗
90¢ last
BidAsk
YES93¢94¢
NO
$77,370 volume
Cross-venue spread 5.0¢· active arbitrage window
CROSS-VENUE ARBITRAGE

Buy YES on Kalshi and NO on Polymarket — total cost 99¢ per $1 payout, locking +1.0¢ per contract before fees.

30-DAY PRICE HISTORY
HOW THIS RESOLVES

Kalshi — primary rule

If Boston and Tampa Bay collectively score more 6.5 runs in the Boston vs Tampa Bay professional baseball game originally scheduled for Sep 18, 2026 at 7:10 PM EDT, then the market resolves to Yes.

Polymarket — resolution criteria

In the upcoming MLB game between the Boston Red Sox and Tampa Bay Rays, scheduled for September 18 at 7:10 PM ET: This market will resolve to "Over" if the Boston Red Sox and Tampa Bay Rays combine to score 7 or more runs in this game. If the combined total is less than 7, 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 spread5.0¢
Kalshi last95¢
Polymarket last90¢
Venues2
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