Miami Marlins vs. St. Louis Cardinals

Platform comparison

Market context

The St. Louis Cardinals defeated the Miami Marlins 2–1 in their June 28 MLB matchup at Busch Stadium, with the game concluding before the settlement window closes on 5 July 2026. This result renders the prediction market for a Marlins win effectively void, as the outcome is already determined and the Cardinals secured the victory.

Historically, when a game finishes before a prediction market’s settlement deadline, the market resolves immediately based on the official final score, regardless of the stated expiry date. In similar MLB contracts where the result was known days in advance, platforms like Kalshi and Polymarket have closed trading and settled within hours of the game’s conclusion, not waiting for the nominal deadline. The current 0% implied probability for a Marlins win aligns with this precedent, reflecting the certainty of the Cardinals’ victory rather than a speculative assessment.

Traders should monitor the official MLB final statistics portal for confirmation of the 2–1 scoreline, which serves as the primary resolution source. No further announcements, lineup changes, or schedule dependencies apply, as the game has already been completed. According to ESPN’s game summary, the Cardinals’ win was confirmed with both teams’ records updated to 43–38 and 44–40 respectively, eliminating any ambiguity about the outcome[3]. With the result settled, the market will resolve to “St. Louis Cardinals” without delay.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is PolyGram. 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.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like PolyGram trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

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.