New York Mets vs. Seattle Mariners

Platform comparison

Active sub-markets

Market context

The New York Mets travel to Seattle on 1 June for a 9:40PM ET matchup against the Mariners, with the market currently pricing a 46% probability of a Mets victory. This represents a near-even contest, reflecting the competitive balance between two mid-table franchises in early June. The settlement window extends to 9 June, allowing for weather delays or rescheduling common in Pacific Northwest baseball during early summer.

Historical matchup data between these clubs shows marginal variance in home-field advantage. Over the past five seasons, the Mets have won 52% of games against Seattle, though the Mariners' home record at T-Mobile Park sits at 54% win rate across all opponents. The current 46% YES probability suggests the market is pricing in a slight Seattle advantage from the home-field context, with the Mets' recent form and roster composition offsetting some of that edge. Comparable late-May to early-June games in prediction markets typically see probabilities tighten within 48-52% ranges when teams are evenly matched.

Traders should monitor pitching assignments and injury reports through 31 May, as rotation decisions often shift market sentiment materially. Recent roster moves or trades affecting either team's lineup depth will surface on MLB transaction feeds and team announcements. Weather forecasts for Seattle on game day—particularly wind patterns affecting fly balls at T-Mobile Park—have historically influenced run-total expectations and, by extension, moneyline probabilities. USDC settlement on btc-prediction.bet will resolve based on official MLB final statistics, with no tie-break provisions if the game concludes in regulation.

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.

Is this market available outside the US?

BTC Prediction 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 does it cost to trade on BTC Prediction?

Zero. BTC Prediction 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, BTC Prediction triggers a quick verification flow that finishes in minutes.