Cleveland Guardians vs. Miami Marlins

Platform comparison

Market context

A Cleveland Guardians victory in their 1:40PM ET MLB clash against the Miami Marlins on 12 July resolves this market to YES, while a Marlins win triggers NO. In prediction markets, a YES share pays out if the stated outcome occurs, whereas a NO share pays if it does not; here, the crowd assigns a 51% chance to the Guardians winning, implying a near-even contest.

Historically, these teams are almost perfectly balanced: the Marlins hold a 19–19 overall record against the Guardians, including a 15–16 split in regular-season games, and they were tied 3–3 in their last six meetings across three seasons[1][5]. The Guardians won the most recent encounter on 14 August 2025 by 9–4, but the Marlins’ recent form shows five straight wins before this matchup, suggesting momentum could shift the 51% implied probability[1][6].

Traders should monitor starting-lineup confirmations and any late pitching changes, as MLB rotations can alter game outcomes significantly. The Guardians beat the Marlins 7–4 on 11 July, with Tanner Bibee and Steven Kwan leading the offence, so today’s performance may hinge on whether that form repeats or the Marlins’ winning streak resumes[8]. Check official MLB announcements before the 17:40Z settlement window for any postponement or cancellation clauses that could delay resolution.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Cleveland Guardians vs. Miami Marlins 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

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

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 Prediction Market UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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 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.