TOTAL VOLUME:
$134.1b
24H VOL:
$113,466,932
24H TRANSACTIONS:
2,388,728,490
OPEN INTEREST:
$1,423,222,590
402,751
Markets across
30,217
events
MATCHED EVENTS:
2,632
PLATFORM COVERAGE:
5
Polymarket:
39%
VS.
Kalshi:
61%
Closed: Jul 12, 8:14 AM EST
Kalshi
This event group covers the outcome of a single NPB (Nippon Professional Baseball) game between the Yokohama BayStars and Yomiuri Giants scheduled for July 12, 2026 at 5:00 AM EDT. Markets across Polymarket and Kalshi are betting on which team will win this matchup.
In the upcoming NPB game, scheduled for July 12 at 5:00AM ET: If the Yokohama BayStars win, the market will resolve to "Yokohama BayStars". If the Yomiuri Giants win, the market will resolve to "Yomiuri Giants". 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.
This event covers a Japan NPB game between Yomiuri Giants and Yokohama DeNA BayStars originally scheduled for July 12, 2026 at 5:00 AM EDT. Each team has a corresponding market that resolves to Yes if that team wins the game. If the game is postponed or delayed, markets remain open and close after the rescheduled game concludes within two days. Should the game be cancelled or rescheduled beyond two days, markets resolve to a fair price per official rules. Tied games result in 50/50 resolution across all markets.
Prediction markets like Polymarket and Kalshi are driven by trader supply and demand rather than sportsbook risk management. Sportsbooks adjust lines to balance action and protect their margin; prediction markets reflect what participants actually believe will happen. This often means prediction market odds move faster in response to breaking news, injury reports, or lineup changes. Comparing the two can reveal whether professional bettors and casual traders see the outcome differently, making prediction markets a useful cross-check against traditional sports betting lines.
Polymarket and Kalshi can show different implied probabilities for the same outcome because of liquidity, fee structure, participant mix, and how each venue defines the contract. Each platform attracts different trader demographics, liquidity pools, and fee structures, which naturally creates price gaps. Polymarket and Kalshi may also have slightly different market mechanics or settlement rules that influence how traders price risk. Arbitrage traders sometimes exploit these spreads, but temporary divergences persist because moving capital between platforms carries friction costs. Monitoring both prices gives you a fuller picture of where consensus truly sits and whether one venue is overvaluing or undervaluing either team.
Key injury announcements, roster changes, or managerial decisions for either team can shift odds significantly. Recent form, head-to-head records, and seasonal momentum also influence trader positioning. Weather conditions on game day, if relevant, may emerge as a late-stage factor. Major trades or unexpected lineup moves in the days leading up to the matchup often trigger sharp repricing. Monitoring team news feeds and sports media will help you stay ahead of market moves and spot opportunities before consensus prices adjust.