TOTAL VOLUME:

$134b

24H VOL:

$103,397,351

24H TRANSACTIONS:

2,388,728,490

OPEN INTEREST:

$1,410,176,180

399,592

Markets across

30,097

events

MATCHED EVENTS:

2,622

PLATFORM COVERAGE:

5

Polymarket:

39%

VS.

Kalshi:

61%

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St. Louis Cardinals vs. Arizona Diamondbacks
polymarket
kalshi
predict

Who will win St. Louis Cardinals vs Arizona Diamondbacks?

Volume:
$5,827,941

St. Louis

 - Kalshi

St. Louis - Kalshi

1W

News

Positive

Negative

Neutral

Hover marker for details

Vol.

·

Resolved Jul 20, 2026

Closed: Jul 18, 12:34 AM EST

kalshi

Kalshi

View
Join Kalshi and score $25 for your first trade.
Outcome
Trade
Chance %
Price
Spread
Liquidity
Volume
24h
7d
Open Interest
Ends in
Result
kalshi

St. Louis

View
100%
Yes 100¢No 0¢
100¢
N/A
$2,276,074
N/A
N/A
$1,077,915
Settled
Yes
polymarket

O/U 9.5

View
100%
Yes 100¢No 0¢
0.1¢
N/A
$12,628
N/A
N/A
N/A
Settled
Yes
polymarket

O/U 11.5

View
100%
Yes 100¢No 0¢
0.1¢
N/A
$7,305
N/A
N/A
N/A
Settled
Yes
polymarket

O/U 10.5

View
100%
Yes 100¢No 0¢
0.1¢
N/A
$5,351
N/A
N/A
N/A
Settled
Yes
polymarket

O/U 8.5

View
100%
Yes 100¢No 0¢
0.1¢
N/A
$2,496
N/A
N/A
N/A
Settled
Yes
polymarket

O/U 12.5

View
100%
Yes 100¢No 0¢
0.1¢
N/A
$751
N/A
N/A
N/A
Settled
Yes
polymarket

O/U 13.5

View
100%
Yes 100¢No 0¢
0.1¢
N/A
$286
N/A
N/A
N/A
Settled
Yes
polymarket

Extra Innings

View
100%
Yes 100¢No 0¢
0.1¢
N/A
$259
N/A
N/A
N/A
Settled
Yes
polymarket

O/U 14.5

View
100%
Yes 100¢No 0¢
0.1¢
N/A
$50
N/A
N/A
N/A
Settled
Yes
polymarket

1st 5 Innings O/U 5.5

View
100%
Yes 100¢No 0¢
0.1¢
N/A
$16
N/A
N/A
N/A
Settled
Yes
polymarket

O/U 7.5

View
100%
Yes 100¢No 0¢
0.1¢
N/A
$15
N/A
N/A
N/A
Settled
Yes
polymarket

O/U 6.5

View
100%
Yes 100¢No 0¢
0.1¢
N/A
$15
N/A
N/A
N/A
Settled
Yes
polymarket

1st 5 Innings O/U 6.5

View
100%
Yes 100¢No 0¢
0.1¢
N/A
$10
N/A
N/A
N/A
Settled
Yes
polymarket

1st 5 Innings Spread -2.5

View
100%
Yes 100¢No 0¢
0.1¢
N/A
$5
N/A
N/A
N/A
Settled
Yes
polymarket

1st 5 Innings O/U 2.5

View
100%
Yes 100¢No 0¢
0.1¢
N/A
$5
N/A
N/A
N/A
Settled
Yes
polymarket

1st 5 Innings O/U 3.5

View
100%
Yes 100¢No 0¢
0.1¢
N/A
$5
N/A
N/A
N/A
Settled
Yes
polymarket

1st 5 Innings O/U 4.5

View
100%
Yes 100¢No 0¢
0.1¢
N/A
$5
N/A
N/A
N/A
Settled
Yes
predict

St. Louis Cardinals vs. Arizona Diamondbacks

View
99%
Yes 99¢No 1¢
—
$14,142
$10,299
N/A
N/A
N/A
Settled
No
polymarket

St. Louis Cardinals vs. Arizona Diamondbacks

View
0%
Yes 0¢No 100¢
—
N/A
$359,746
N/A
N/A
N/A
Settled
Yes
kalshi

Arizona

View
0%
Yes 0¢No 100¢
100¢
N/A
$3,097,718
N/A
N/A
$1,385,864
Settled
No
polymarket

Spread -1.5

View
0%
Yes 0¢No 100¢
—
N/A
$27,225
N/A
N/A
N/A
Settled
Yes
polymarket

Spread -2.5

View
0%
Yes 0¢No 100¢
—
N/A
$15,947
N/A
N/A
N/A
Settled
Yes
polymarket

Spread -1.5

View
0%
Yes 0¢No 100¢
—
N/A
$7,175
N/A
N/A
N/A
Settled
Yes
polymarket

Spread -4.5

View
0%
Yes 0¢No 100¢
—
N/A
$2,752
N/A
N/A
N/A
Settled
Yes
polymarket

Spread -3.5

View
0%
Yes 0¢No 100¢
—
N/A
$561
N/A
N/A
N/A
Settled
Yes
Total markets: 25 of 34

Intro

This market tracks the over/under total runs scored in matchups between the St. Louis Cardinals and Arizona Diamondbacks. Across Polymarket, Kalshi, and Predict, the aggregated consensus shows 100.0% probability for the O/U 9.5 outcome, as resolved by MLB.com official records. Note that resolution divergence alerts indicate platform differences in scheduled game times and market scope—some platforms track game winners while others focus on specific in-game events. Watch for the scheduled game time on July 26, 2026, which will determine the final resolution window across all aggregated platforms.

PredictionHero - Resolution Divergence Alerts (RDA)

Divergence Detected

Issue: Three critical failures: (1) Date/time mismatch between platforms (July 17 vs July 19), (2) Kalshi market has logically contradictory resolution criteria where both Cardinals win and Diamondbacks win resolve to Yes, (3) Polymarket includes a fundamentally different market type (first-inning scoring) alongside the winner market, creating scope fragmentation.Hero tip: Do not place trades on any of these markets until the date discrepancy is resolved and Kalshi's contradictory logic is corrected. Verify the actual Cardinals-Diamondbacks game date on MLB.com. Treat Kalshi market as unresolvable in its current form. Polymarket's two separate markets (winner vs first-inning scoring) are distinct products and should not be conflated.

Critical divergence points:

  • Predict: Game winner market (Cardinals or Diamondbacks) scheduled July 17, 9:40 PM ET. Resolves to winning team or 50-50 if canceled/tied/no makeup. Primary source: official MLB final statistics or credible consensus within 24 hours. Key Quote: 'If the game is canceled entirely, with no make-up game, or ends in a tie, this market will resolve 50-50.'
  • Polymarket (Winner Market): Game winner market scheduled July 19, 4:10 PM ET—different date than Predict. Identical winner resolution logic and 50-50 tie/cancellation rule. Primary source: official MLB statistics or credible consensus within 24 hours. Key Quote: 'This market will resolve to "St. Louis Cardinals" if the St. Louis Cardinals win the game.'
  • Polymarket (First-Inning Scoring Market): Separate market tracking whether any run is scored in the 1st inning (Yes/No). Scheduled July 19, 4:10 PM ET. Resolves 50-50 if game canceled. This is a fundamentally different market type from winner markets. Key Quote: 'This market will resolve to "Yes" if at least one run is scored in the 1st inning by either the St. Louis Cardinals or Arizona Diamondbacks.'
  • Kalshi: CRITICAL LOGIC ERROR: Market states 'If St. Louis wins... resolves to Yes' AND 'If Arizona wins... resolves to Yes.' This is logically impossible—both outcomes cannot resolve to the same result. Market is unresolvable as written. Scheduled July 17, 2026 at 9:40 PM EDT. Key Quote: 'If St. Louis wins the St. Louis vs Arizona professional baseball game originally scheduled for Jul 17, 2026 at 9:40 PM EDT, then the market resolves to Yes. If Arizona wins the St. Louis vs Arizona professional baseball game originally scheduled for Jul 17, 2026 at 9:40 PM EDT, then the market resolves to Yes.'
Our PredictionHero Resolution Divergence Alerts (RDA) are there to help users identify potential differences across platforms. They do not replace or supersede the official rules and description of any prediction market. Users are solely responsible for reviewing and understanding the applicable rules and resolution criteria before placing any trade or bet. If you notice a potential inconsistency, discrepancy, or error in an alert, please report it to our team so we can review and improve the accuracy of our data.

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.

Kalshi

This event covers the St. Louis vs Arizona professional baseball game originally scheduled for July 17, 2026 at 9:40 PM EDT. Resolution depends on the actual game outcome: if St. Louis wins, the St. Louis market resolves Yes; if Arizona wins, the Arizona market resolves Yes. 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 more than two days away, markets resolve to a fair price determined in accordance with platform rules.

Predict

In the upcoming MLB game between the St. Louis Cardinals and Arizona Diamondbacks, scheduled for July 17 at 9:40PM 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.

Frequently asked questions

The dashboard aggregates prediction market activity across Polymarket and Predict for the Cardinals vs. Diamondbacks matchup, displaying real-time odds and trading volume as participants forecast the game's outcome. Traders on both platforms are pricing their beliefs about which team will win, with each venue maintaining its own order book and price discovery mechanism. The cross-platform view lets you compare how different communities of predictors are positioning themselves ahead of the event, offering insight into consensus expectations and areas where the two markets may diverge in their assessment of the matchup.

Prediction markets and sportsbooks price outcomes through different mechanisms. Sportsbooks set lines based on their risk management and profit targets, while prediction markets derive prices from continuous trading between participants who profit by accurately forecasting results. Prediction market odds often reflect crowd wisdom and can diverge meaningfully from sportsbook spreads, especially as new information emerges. Neither is inherently more accurate, but comparing the two can reveal where smart money is positioning itself and highlight potential value opportunities in this market relative to traditional betting venues.

Polymarket and Predict 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 produces price variation. Polymarket and Predict may also weight recent news or team updates differently, or have distinct user bases with varying risk appetites. Arbitrage traders typically exploit these gaps, but temporary divergences persist due to market friction, platform-specific rules, and the time required for information to propagate across venues. Monitoring both prices helps you identify mispricings and understand where consensus is strongest.

Key catalysts include injury announcements affecting star players, lineup changes, recent team performance trends, and weather conditions on game day. Betting action from sharp money can also shift odds significantly as informed traders position ahead of the event. Line movement on sportsbooks may signal where professional bettors are leaning, influencing prediction market prices in turn. Breaking news about team morale, coaching decisions, or player availability can trigger rapid repricing as traders update their forecasts based on new information.