Miami Marlins vs. New York Mets

Platform comparison

Market context

The Miami Marlins and New York Mets meet again in a series that has already shown how quickly the price can move on a single result. Miami won 5-2 on 31 July, but New York beat them 4-2 on 30 July, and the teams split several tight games earlier in the season, including a 9-7 Mets win in extra innings and a 2-1 Marlins win. That history matters for a programme that is only modestly above even money: a 53% YES implies a small edge, not a strong one, and in a matchup with short-run variance, that is often just a shorthand for bullpen quality, venue and line-up strength rather than a durable form signal.[1][6][9][11]

For programmatic trading, the most relevant inputs are the confirmed starter, late scratch risk, and whether either side is altering its bullpen usage after the preceding games. TeamRankings shows Miami at 26-33 and New York at 25-33 in the cited snapshot, with the Mets stronger at home and the Marlins notably weaker away, which is consistent with a slight home-side lean in a single-game market.[1][17] The live catalyst to watch is the official line-up card and any pre-game pitching change, because those updates can shift an automated model faster than the crowd price itself; the market also stays open through postponement and only resolves 50-50 if there is no make-up game or a tie, so a bot needs to monitor the schedule, not just the first scheduled start time.[20]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Miami Marlins vs. New York Mets across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Kalshi Fees, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Kalshi 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.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

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.