Live prediction market odds for St. Louis Cardinals vs. Miami Marlins (6:40 PM ET). Compare prices across Kalshi and Polymarket.
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Kalshi / Polymarket
2026-04-21
St. Louis Cardinals vs. Miami Marlins (6:40 PM ET) — MLB game scheduled for 2026-04-21. Compare live prediction market odds from Kalshi, Polymarket, and more on Prediction Hunt.
Miami Marlins leads the “St. Louis Cardinals vs. Miami Marlins (6:40 PM ET)” event at 50.5% implied probability, followed by St. Louis Cardinals at 49.0%. A 5.0% cross-platform spread signals an active arbitrage window.
St. Louis Cardinals vs. Miami Marlins (6:40 PM ET) is a prediction market event currently tracked across 2 platforms (Kalshi, Polymarket). Miami Marlins leads at 51% implied probability, making it the market favorite. Other contenders include St. Louis Cardinals at 49%.
Miami Marlins currently leads at 51% implied probability. Behind Miami Marlins, St. Louis Cardinals at 49% are the next closest contenders. The 5.0% cross-platform spread suggested platforms were pricing new information differently, creating potential trading opportunities.
Here are the latest odds across Kalshi, Polymarket: Miami Marlins: 48¢ on Kalshi, 53¢ on Polymarket. St. Louis Cardinals: 51¢ on Kalshi, 47¢ on Polymarket. The 5.0% spread across platforms highlights where markets disagree — a gap traders can exploit by buying low on one platform and selling high on another.
A price of 51¢ means the market estimates a 51% probability that Miami Marlins will be the outcome. Buying one share at 51¢ pays out $1.00 if correct — a 96% return — or $0 if wrong. This is the core mechanic of prediction markets: the price directly reflects the crowd's probability estimate.
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Official settlement criteria, resolution sources, and edge cases across Kalshi and Polymarket.
KalshiIf St. Louis wins the St. Louis vs Miami professional baseball game originally scheduled for Apr 21, 2026 at 6:40 PM EDT, then the market resolves to Yes.
The following market refers to the St. Louis vs Miami professional baseball game originally scheduled for Apr 21, 2026 at 6:40 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.
PolymarketIn the upcoming MLB game between the St. Louis Cardinals and Miami Marlins, scheduled for April 21 at 6:40PM ET: This market will resolve to "St. Louis Cardinals" if the St. Louis Cardinals win the game. This market will resolve to "Miami Marlins" if the Miami Marlins 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.
Miami Marlins
50.5% avg
