Boston Red Sox vs. Seattle Mariners

Platform comparison

Active sub-markets

Market context

The Boston Red Sox are scheduled to play the Seattle Mariners at T-Mobile Park, and this market pays out on the team that wins the game. In prediction-market terms, a **YES** share means Boston wins, while a **NO** share means Seattle wins; if the game is postponed, the market stays open until it is completed, and a cancellation or tie would settle 50-50 under the contract terms.

An 82% crowd-implied probability for Boston is a strong favourite signal, but readers new to markets should treat it as a live consensus rather than a certainty. The clearest recent comparison is the previous meeting on 20 June, when Boston won 5-1 and took the series, which helps explain why traders may be leaning Red Sox despite Seattle’s better season record and home-field advantage. ESPN’s current game listing also prices Seattle as the underdog, with Boston favoured on the moneyline, which is consistent with the market’s bias towards the Red Sox.[1][3]

For traders, the main catalysts are lineup confirmation, pitching announcements, and any schedule changes. MLB’s own schedule update shows this series has already been adjusted once, with a doubleheader and timing changes earlier in the week, so late-breaking changes remain relevant to settlement risk and trading.[5] The market description also matters: because it resolves only on the official final result, any postponement simply extends the window until the game is completed, whereas a cancellation or tie triggers the 50-50 fallback. Given the settlement deadline of 28 June, the key issue is not the calendar date alone but whether the game is actually played to completion.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). The odds column is filled only where we have clean data — that avoids the made-up numbers that get a network demoted when search engines cross-check against the source venue.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

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 Prediction Market UK?

Zero. Prediction Market UK 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, Prediction Market UK 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.