Miami Marlins vs. New York Mets

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Active sub-markets

Market context

On 31 May 2026, the Miami Marlins will travel to New York to face the Mets in a regular-season Major League Baseball contest, with first pitch scheduled for 1:40 PM Eastern Time. The market currently implies a 42% probability of a Marlins victory, reflecting modest underdog status. Resolution will follow official MLB final statistics; any postponement extends the settlement window until completion, whilst cancellation or a tie would trigger a 50-50 split resolution.

Historical matchup data and seasonal form provide essential context for interpreting the current odds. The Marlins and Mets have played 19 times in 2025, with the Mets holding a slight edge in head-to-head record. Marlins home-field advantage is absent here, and Miami's road performance typically trails their home splits by 3–5 percentage points in win probability. Comparable late-May fixtures between these franchises over the past three seasons show the Mets favoured in approximately 55–60% of instances when playing at Citi Field, suggesting the 42% Marlins probability sits slightly below historical norms for visiting underdogs in this pairing.

Traders should monitor roster announcements through late May, particularly injury updates affecting starting pitchers and key position players on both sides. Weather conditions at Citi Field—wind direction and temperature—can materially affect run-scoring environments. Recent form entering the fixture matters considerably; a Marlins winning streak or Mets slump could shift implied probabilities meaningfully. From a regulatory standpoint, this market falls within the $1,500 no-KYC threshold under most UK-regulated prediction market frameworks, though German GlüStV restrictions and US CFTC reach may apply depending on trader jurisdiction. Verification requirements vary by platform and user location.

Methodology

We track Miami Marlins vs. New York Mets 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

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 Polymarket Legal UK?

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

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Polymarket Legal UK triggers a quick verification flow that finishes in 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.