New York Mets vs. Miami Marlins

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Active sub-markets

Market context

The New York Mets travel to Miami to face the Marlins on 23 May at 4:10PM ET in a regular-season Major League Baseball fixture. The current crowd-implied probability of 18% for a Mets victory reflects substantial backing for the home side, though this represents a meaningful underdog position for New York given typical matchup dynamics in May baseball.

Historical records between these franchises show the Mets have maintained a competitive edge in recent seasons, winning roughly 55% of head-to-head contests over the past three years. However, the Marlins' home-field advantage at loanDepot Park carries measurable weight in May fixtures, where visiting teams typically win at rates 2–3 percentage points below their season averages. The 18% probability assigned to the Mets suggests the market is pricing in both Miami's home status and any relevant roster considerations at the time of settlement.

Traders monitoring this market should track pitching assignments in the days preceding the fixture, as starting pitcher quality remains the primary driver of single-game outcomes. Recent injury reports from both organisations' official channels and MLB.com will clarify whether either side faces unexpected roster constraints. Weather conditions at game time—particularly wind direction and temperature affecting ball carry at Miami's ballpark—merit attention, as May conditions can shift offensive production measurably. The settlement window extends to 30 May, allowing for postponement resolution should weather interrupt the scheduled 23 May contest.

Methodology

This page tracks New York Mets vs. Miami Marlins across four political prediction venues. Live odds come from the Polymarket order book (the deepest political prediction-market book). Kalshi is the CFTC-regulated US alternative, Betfair the established UK sports-exchange with politics markets, Manifold the open play-money variant. PolyGram routes every trade through to Polymarket — at 0% fees.

Resolution & payout

Political markets typically settle on official candidate or agency confirmation. Polymarket uses UMA Optimistic Oracle: a proposer posts the outcome with a bond, the two-hour window opens, then the smart contract pays USDC.

Kalshi settles USD via CFTC clearinghouse, with clearly defined resolution sources (e.g. AP race calls for elections). Betfair settles after the official outcome is registered with the league or agency. Manifold is play-money.

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.

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.