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·Sun 4:10 PM ET

Arizona vs ST Louis

Arizona is the current favorite at $0.56 ask on Kalshi and $0.56 ask on Polymarket — an implied ≈56% chance. Prices as of 03:01 UTC on Jul 17, 2026, delayed about five minutes. Source markets: Kalshi · Polymarket. Resolution follows each venue's own market terms.

Curious how long a gap like this stays open? We measured it.

Arizona

Sun 4:10 PM ET

ST Louis
50%60%70%80%90%100%4:35 PM6:04 PM7:39 PM9:21 PM10:59 PM56¢

Moneyline

Arizona
Kalshi56¢Polymarket56¢
ST Louis5¢ gap
Kalshi46¢Polymarket51¢

How this settles

Spread
Read each venue's rules

Kalshi

The following market refers to the St. Louis vs Arizona professional baseball game originally scheduled for Jul 19, 2026 at 4:10 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. Kalshi is not affiliated, associated, authorized, endorsed by, or in any way officially connected with the Governing League. All trademarks, logos, and brand names are the property of their respective owners.

Polymarket

In the upcoming MLB game between the St. Louis Cardinals and Arizona Diamondbacks, scheduled for July 19 at 4:10PM ET: This market will resolve to "St. Louis Cardinals" if the St. Louis Cardinals win the game. This market will resolve to "Arizona Diamondbacks" if the Arizona Diamondbacks 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.

Prices delayed about five minutes. Each venue's best ask per outcome; Kalshi asks are derived from its NO bids (ask = $1 minus the bid). Kalshi volume counts contracts, Polymarket volume is in dollars. Real-time prices and the full depth ladder are available via the WebSocket stream with an API key. How the market matching API works · Real-time WebSocket API docs. Feed reference DINO-XKQZ7-9182.