New York Mets vs. Miami Marlins

Platform comparison

Active sub-markets

Market context

The Mets travel to Miami for a May 23rd afternoon fixture against the Marlins, with the crowd currently pricing a Mets victory at 12 per cent. This is a significant underdog positioning for New York, suggesting the market views Miami as a clear favourite despite the Mets' larger market profile and historical resources.

Context matters here: the Marlins have historically underperformed relative to payroll and roster talent, whilst the Mets have shown volatility in recent seasons tied directly to injury status and bullpen reliability. A 12 per cent probability for the visiting team implies the Marlins are being priced as roughly 7-to-1 favourites. This gap widens considerably when accounting for home-field advantage in May, where weather conditions favour Miami's climate-adapted roster. The Mets' recent record against sub-.500 teams and their performance in day games will be the historical benchmark here—both categories where they've shown inconsistency.

The settlement window extends to 30 May, allowing for postponement coverage should weather intervene. Traders should monitor starting pitcher assignments in the 48 hours before the fixture, as rotation depth differs markedly between the clubs. Recent roster moves or injury updates from either side—particularly bullpen availability for the Mets—could shift the probability meaningfully. The consensus at 12 per cent suggests confidence in Miami's baseline advantage, but any news of key Marlins absences or unexpected Mets reinforcements would represent the primary catalyst for repricing.

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

Where can I trade this market with the lowest fees?

On PolyGram, 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?

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 does it cost to trade on PolyGram?

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

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.