Miami Marlins vs. St. Louis Cardinals

Platform comparison

Market context

The Miami Marlins and St. Louis Cardinals faced off on 28 June in a 2:15 PM ET MLB clash, with the Cardinals securing a narrow 2–1 victory. On Polymarket today, the contract for “Miami Marlins” to win trades at a current crowd-implied probability of 0% YES, reflecting the on-chain settlement that the Marlins did not win. This pricing is anchored in the conditional tokens system on Polygon, where USDC stakes are locked until the official final statistics confirm the outcome, and the market has already resolved against the Marlins.

Historically, similar low-probability MLB contracts have resolved definitively when a team’s starting pitcher underperforms or when a late-inning defensive error flips the result. In this case, the Marlins’ starter Phillips (1–2, 3.09 ERA) held a slight edge over Cardinals’ Leahy (5–4, 4.24 ERA), yet the Cardinals’ bullpen and late-inning defence proved decisive. Past data shows that when the over/under is set near 9.5 and the game ends 2–1, the underdog’s win probability often collapses to near zero if the favourite’s pitcher limits damage in the final frames, as seen in recent numberFire models predicting a 52.8% Cardinals win chance[1].

Traders should monitor immediate post-game announcements regarding player injuries, pitching rotations for the next series, and any official MLB clarifications on game validity. The combined score of 9.5 was set pre-game, and the final 2–1 result confirms the under hit, which may influence adjacent markets on total runs. Recent coverage notes the Marlins’ improved road hitting but highlights the Cardinals’ stronger bullpen performance, a key catalyst that shifted the outcome[6]. No further game delays are expected, and the settlement window closes on 5 July 2026, with the on-chain resolution now complete.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Miami Marlins vs. St. Louis Cardinals across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

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

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 does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

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 Kalshi UK 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.