Boston Red Sox vs. Cleveland Guardians

Platform comparison

Active sub-markets

Market context

The Boston Red Sox travel to Cleveland for a day game on 31 May at 1:40 PM ET against the Guardians. The settlement window extends to 7 June, allowing for postponements common in late spring baseball. Current crowd-implied probability sits at 47% for a Red Sox victory, suggesting modest confidence in the home side despite Boston's recent record.

Historical matchups between these franchises show the Guardians have held a slight edge in recent seasons, winning 52% of games since 2020. However, day games favour teams with stronger bullpen depth and consistent offensive production—factors that shift considerably based on roster health and starting pitcher assignment. The Red Sox's performance in afternoon contests has historically tracked 3-4 percentage points below their overall win rate, a pattern worth incorporating into conditional order logic when evaluating this fixture.

Traders should monitor roster updates through 30 May, particularly injury reports affecting either starting pitcher or key position players. Cleveland's recent form matters substantially; the Guardians' record in May typically predicts June performance more reliably than season-long averages. Weather conditions at Cleveland's ballpark—wind direction and temperature—carry measurable impact on run totals and should feed into any algorithmic pricing models. Official MLB injury reports and team announcements released 24 hours before first pitch will provide the final data points for position refinement before settlement.

Methodology

We track Boston Red Sox vs. Cleveland Guardians on the five venues with material liquidity for prediction markets. Live odds come from the Polymarket Polygon order book — the only source that ships real-time data under an open licence. For Kalshi, Betfair and Manifold we list platform attributes (fee, KYC, settlement, payment) instead of fabricated odds, because their APIs use non-comparable contract definitions.

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

Is this market available outside the US?

Polymarket Bot UK 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.

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.