New York Mets vs. Miami Marlins

Platform comparison

Active sub-markets

Market context

The Mets travel to Miami for a regular-season matchup on 24 May, with first pitch at 1:40 PM ET. The current 40% implied probability for a Mets victory reflects their mid-table standing in the National League East and the Marlins' competitive position within their division. Across prediction markets, this probability translates differently: Polymarket displays it as a direct percentage, whilst Kalshi would show approximately 2.50 decimal odds, and Betfair's fractional format would render it around 3/2 against. Fee structures diverge notably—Polymarket charges 2% on both sides, Kalshi applies a 2% taker fee only, and Betfair's commission varies by volume tier, typically 5–6% on winning bets. KYC requirements differ too: Polymarket and Kalshi both enforce full identity verification for US traders, whilst Smarkets permits UK residents to trade with lighter documentation.

Historical context matters here. The Mets' win probability at 40% sits below their season-long performance expectations, suggesting either recent form deterioration or injury concerns. The Marlins have shown inconsistency against stronger opponents but perform better in home games. Traders should monitor pitching assignments—starter quality typically shifts these markets by 5–10 percentage points—and any last-minute roster changes announced before game time.

The settlement window extends to 31 May at 17:40 UTC, providing buffer for postponements common in May weather. Cancellation or tie scenarios resolve 50-50 across all platforms, though this outcome remains statistically rare in modern MLB.

Methodology

We read New York Mets vs. Miami Marlins from four platform perspectives: Polymarket (on-chain CLOB), Kalshi (CFTC-regulated exchange), Betfair Exchange (sports book exchange), Smarkets (peer-to-peer betting exchange). Polymarket's live quote comes directly from the Polygon order book; the other three are listed with their platform attributes — fees, KYC, settlement currency, payment options — because a 1:1 contract comparison without API access would be guesswork.

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

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'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, PolyGram triggers a quick verification flow that finishes in minutes.