Miami Marlins vs. New York Mets

Platform comparison

Active sub-markets

Market context

The Miami Marlins travel to New York to face the Mets on 29 May at 7:10 PM ET in a National League East matchup. The 59% crowd-implied probability favours the Marlins, reflecting their recent form relative to the Mets' inconsistency this season. Across major prediction platforms, this probability translates differently: Polymarket displays it as an implied probability directly, whilst Kalshi and Betfair express equivalent odds in decimal format (approximately 1.44 on Betfair for a Marlins win). Fee structures diverge notably—Polymarket charges 2% on winnings, Kalshi operates commission-free but with tighter spreads, and Betfair's lay betting introduces counterparty dynamics absent from the other two. KYC requirements also vary; Kalshi enforces stricter US residency verification than Polymarket's broader international reach, affecting liquidity depth on this specific market.

Historical matchups between these clubs show marginal edges; the Marlins have won 51 of their last 102 meetings against the Mets, a near-coin-flip record that contextualises why the current 59% probability sits only modestly above 50-50. Recent form matters more than historical averages here. As of late May 2025, the Mets' pitching rotation health and the Marlins' offensive consistency will determine whether the crowd's slight lean toward Miami holds. Traders should monitor lineup announcements 24 hours before first pitch and any last-minute bullpen adjustments, particularly if either team's closer remains unavailable. The settlement window extends to 5 June 2026, allowing for postponement resolution, though May weather in New York rarely forces delays at this time of year.

Methodology

This page compares Miami Marlins vs. New York Mets specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. Live odds come from the Polymarket order book; the other venues' contract details are maintained manually because their APIs aren't directly comparable. Every CTA routes to Polymarket Alternative, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Polymarket settles via UMA Optimistic Oracle on Polygon. A proposer posts the outcome with a bond, the two-hour window runs, then the smart contract pays USDC.

Kalshi settles USD through the CFTC-regulated clearinghouse — the cleanest variant, with heavier KYC. Betfair Exchange settles in account currency (GBP/EUR), net of 2-5% commission. Smarkets follows the same model as Betfair with a lower default 2% commission.

FAQ

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 Polymarket Alternative?

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

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, Polymarket Alternative 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.