Miami Marlins vs. New York Mets

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Active sub-markets

Market context

The Miami Marlins travel to Queens for a day game against the New York Mets on 31 May, with first pitch at 1:40 PM ET. The crowd-implied probability of 42% for a Marlins victory suggests the market views the Mets as modest favourites, though the gap between the two franchises' recent form and roster depth warrants scrutiny. The Mets, despite roster inconsistency, maintain stronger offensive depth and pitching infrastructure than the rebuilding Marlins, whose 2024–2025 campaign has centred on player development rather than contention. Historical matchups between these division rivals show the Mets winning roughly 55–60% of regular-season encounters over the past five seasons, which aligns reasonably with the current 58% implied probability for New York.

The critical variable here is starting pitcher assignment. If the Mets deploy a top-tier starter—particularly against a Marlins rotation still developing its depth—the underdog probability of 42% may undervalue the home team's advantage. Conversely, if Miami counters with unexpected pitching strength or the Mets field a weakened lineup due to injury, the Marlins' value improves materially. Day games at Citi Field historically favour teams with disciplined plate approaches; the Mets' recent offensive struggles, documented through May 2026 reporting, could narrow their expected edge. Weather conditions for a 1:40 PM ET start in late May typically favour hitters, potentially benefiting whichever team generates more consistent contact. Traders should monitor roster updates through 30 May for any late-breaking injuries or roster moves that shift the pitching matchup.

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

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

FAQ

Where can I trade this market with the lowest fees?

On Who Will Win 2026, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Who Will Win 2026 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.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Who Will Win 2026 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.