Miami Marlins vs. St. Louis Cardinals

Platform comparison

Active sub-markets

Market context

The Miami Marlins and St. Louis Cardinals faced off at Busch Stadium in St. Louis on Friday, 26 June 2026, with the game scheduled for 8:15 p.m. ET. The contest, broadcast on Cardinals.TV and Marlins.TV, was a standard MLB regular-season matchup where the winner would be determined by final score, with no possibility of a tie under normal rules[1][2].

Historically, 100% implied probability in MLB markets is exceptionally rare and usually signals a postponed game or a data error rather than a genuine certainty, as even heavy favourites like the 2024 Cardinals or 2023 Marlins have lost at home in comparable June fixtures[4][5]. In similar cases where books diverged, Polymarket’s decimal odds often exposed the discrepancy more clearly than Kalshi’s implied probability format, while Betfair’s liquidity and Smarkets’ lower fees (0.2% versus Polymarket’s gas-heavy model) offered traders alternative routes to hedge when the 100% figure proved unsustainable[5].

Traders should monitor the official MLB final statistics for any cancellation or tie resolution, which would trigger a 50-50 split, and watch for Alec Burleson’s on-base streak extension or Max Meyer’s pitching performance, both highlighted in the pre-game preview[5]. Recent coverage from The Athletic confirms the box score was processed on 26 June, suggesting the game has concluded, yet the 100% YES figure remains unexplained unless the market has not yet updated to reflect the actual result[9]. Any delay in settlement beyond the 4 July 2026 window would indicate a technical lag rather than a genuine postponement, a scenario where Kalshi’s KYC requirements and Polymarket’s permissionless access diverge significantly in user experience.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Miami Marlins vs. St. Louis Cardinals specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. Live odds come from the Polymarket order book; the other venues' contract details are maintained manually because their APIs aren't directly comparable. Every CTA routes to PolyGram, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Polymarket settles via UMA Optimistic Oracle on Polygon. A proposer posts the outcome with a bond, the two-hour window runs, then the smart contract pays USDC.

Kalshi settles USD through the CFTC-regulated clearinghouse — the cleanest variant, with heavier KYC. Betfair Exchange settles in account currency (GBP/EUR), net of 2-5% commission. Smarkets follows the same model as Betfair with a lower default 2% commission.

FAQ

Where can I trade this market with the lowest fees?

On PolyGram, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

What does it cost to trade on PolyGram?

Zero. PolyGram routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.