Miami Marlins vs. New York Mets

Platform comparison

Active sub-markets

Market context

The Miami Marlins travel to Citi Field on 31 May for a regular-season matchup against the New York Mets, with the contest scheduled for 1:40 PM ET. Current crowd-implied probability favours the Mets at 58 per cent, reflecting their stronger recent form and home-field advantage. Settlement occurs in USDC upon official MLB confirmation of the final result, with the resolution window extending to 7 June should postponement occur.

Historically, the Mets have held the upper hand in this fixture over recent seasons, though the Marlins remain competitive in divisional play. The 42 per cent probability assigned to Miami suggests traders view them as genuine underdogs rather than dismissing their chances outright. Context matters: late-May positioning often reflects teams' injury status and bullpen depth rather than season-long records alone. The Marlins' recent performance against National League East opponents and their pitching availability will be material factors in how this probability should shift.

Traders should monitor roster announcements through 30 May, particularly regarding starting pitcher confirmation and any last-minute injury disclosures from either club. Weather conditions at Citi Field—afternoon games in late May can see variable wind patterns affecting play—merit checking National Weather Service forecasts closer to game time. Funding rates on related sports derivatives across major exchanges have remained relatively stable, suggesting no significant whale positioning has emerged in this specific matchup. Official lineups typically release 90 minutes before first pitch, providing a final catalyst for probability adjustment before market lock.

Methodology

Methodologically this overview focuses on on-chain pricing: Polymarket's live mid comes from the Polygon conditional-token order book and settles automatically in USDC. The other three venues — Kalshi, Betfair, Manifold — are listed with their platform attributes, because they operate off-chain and a 1:1 comparison of contract mechanics isn't possible.

Resolution & payout

Settlement is on-chain via UMA Optimistic Oracle. A proposer posts the outcome with a bond, a two-hour dispute window opens, then the smart contract lifts winning conditional tokens to 1 USDC and sends payments to holders' wallets automatically. No withdrawal fees beyond Polygon gas.

Off-chain venues (Kalshi, Betfair, Smarkets) settle in local fiat through bank-side clearing — faster than SWIFT, slower than on-chain. Manifold pays no real cash.

FAQ

Where can I trade this market with the lowest fees?

On BTC Prediction, 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.

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.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, BTC Prediction triggers a quick verification flow that finishes in minutes.