Arizona Diamondbacks vs. Boston Red Sox

Platform comparison

Market context

The Arizona Diamondbacks travel to Boston for a single game on 19 August at 4:10 PM ET, with the Red Sox currently favoured at 60% implied probability. This matchup falls late in the regular season, when roster depth and injury status become material factors in game outcomes. The settlement window extends to 26 August, allowing for postponements without market closure—a relevant consideration given August weather patterns in the Northeast.

Historical precedent suggests that late-season inter-league games between mid-table teams typically see modest home-field advantages reflected in pricing. The Red Sox have maintained a slight edge in head-to-head records against the Diamondbacks over recent seasons, though this carries limited predictive weight for single-game outcomes. The 40% probability assigned to Arizona indicates the market is pricing in Boston's home advantage and recent form, but leaves meaningful room for value if Arizona's pitching matchup or offensive metrics suggest undervaluation.

Traders monitoring this market should track roster announcements through 18 August, particularly starting pitcher confirmations and any late-inning bullpen availability. Recent injury reports from both organisations, accessible via MLB's official transaction logs, will inform conditional order placement. Weather forecasts for Fenway Park on game day merit attention—temperature and wind conditions can significantly influence run totals and thus game outcomes. For algorithmic approaches, this market's resolution dependency on official MLB statistics means feeds from ESPN or MLB.com will be the authoritative source, with postponement clauses requiring active monitoring through the settlement window.

Methodology

We track Arizona Diamondbacks vs. Boston Red Sox across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

FAQ

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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.