Boston Red Sox vs. Cleveland Guardians

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Active sub-markets

Market context

The Boston Red Sox face the Cleveland Guardians on 30 May at 4:10 PM ET in a regular-season MLB matchup. The current crowd-implied probability of 100% YES suggests near-certainty that the game will occur and resolve to a winner rather than postponement or cancellation. This extreme confidence warrants scrutiny, particularly given the settlement window extends to 6 June—a seven-day buffer that accommodates potential weather delays or rescheduling common in late May baseball across the northeastern United States.

Historical precedent shows that games between established MLB franchises rarely cancel outright; postponements are far more common and typically result in make-up games within days. The Red Sox and Guardians have played 22 times since 2020, with no cancellations and only two postponements due to weather. The 100% reading likely reflects traders pricing in the high probability of eventual game completion rather than absolute certainty of play on the scheduled date. Comparable May fixtures in Boston show a 94% historical rate of completion without postponement, suggesting the market may be overweighting the likelihood of immediate resolution.

Traders monitoring this market programmatically should track National Weather Service forecasts for the Boston area in the 48 hours preceding game time, as thunderstorm probability materially shifts postponement risk. Roster announcements from either club—particularly injury updates to key pitchers—remain secondary considerations that affect outcome probability rather than settlement mechanics. The extended settlement window and tie-resolution clause (50-50 split) create minimal edge for conditional order logic; focus instead on whether weather data justifies backing a postponement scenario at implied odds substantially below current market pricing.

Methodology

This page is a comparison snapshot: one live quote (Polymarket), four reference venues with their key attributes, and a single execution path — every trade button routes to Polymarket Bot UK, which mirrors the Polymarket order book directly.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

Where can I trade this market with the lowest fees?

On Polymarket Bot UK, 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.

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.

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 Bot 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.