New York Mets vs. Miami Marlins

Platform comparison

Active sub-markets

Market context

The market is trading at 49% YES for New York Mets on Polymarket, so the contract is close to a coin flip in USDC on Polygon rather than implying a clear favourite. That is consistent with the teams’ broadly similar records entering the May 22 game in Miami: both were 22-28, with the Mets 11-15 away and the Marlins 15-14 at home, according to ESPN’s live game page. The on-chain price is therefore reflecting a modest home-field edge for Miami, but not enough to move far from parity.

Recent head-to-head form does not point decisively one way either. StatMuse’s last-10 results between the sides show Miami winning the most recent meeting, 4-0 on 28 September 2025, while the broader split has been mixed rather than one-sided. Stat lines on ESPN also suggest a fairly even matchup: the Mets have the slightly stronger ERA at 3.85 versus Miami’s 4.39, while the Marlins have the edge in on-base and slugging percentage. That kind of profile usually supports a narrow market band, where one starting pitching change or bullpen availability note can shift the implied probability quickly.

For traders, the main catalysts are the official line-ups, starting pitcher confirmation, and any late injury or weather updates before first pitch. MLB.com had already posted a May 22 clip on Eury Pérez against the Mets, underlining that the Marlins’ pitching situation is a live variable. Because Polymarket settlement follows the official final result, not in-game sentiment, any postponement would keep the contract open until the make-up game is played, while a cancellation or tie would settle 50-50 under the market rules.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track New York Mets vs. Miami Marlins on the five venues with material liquidity for prediction markets. Live odds come from the Polymarket Polygon order book — the only source that ships real-time data under an open licence. For Kalshi, Betfair and Manifold we list platform attributes (fee, KYC, settlement, payment) instead of fabricated odds, because their APIs use non-comparable contract definitions.

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

Is this market available outside the US?

PolyGram is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

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.

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.

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.