Arizona Diamondbacks vs. Boston Red Sox

Platform comparison

Market context

The Arizona Diamondbacks travel to Boston for an MLB matchup on 17 August at 7:10 PM ET, with the settlement window extending to 24 August. The 0% implied probability on the Diamondbacks reflects either exceptionally strong Red Sox positioning across prediction markets or a data lag, as major sportsbooks typically quote meaningful two-way odds on regular-season games absent extraordinary circumstances such as roster depletion or weather cancellations.

Historical precedent suggests that single-game MLB contracts settling at extreme probabilities often involve late-breaking roster news or pitching changes announced within 24 hours of first pitch. The Diamondbacks finished the 2023 season with a 84–78 record and made a World Series run, whilst the Red Sox have underperformed relative to payroll in recent seasons. Traders should cross-reference current sportsbook lines—which typically reflect sharper information than prediction markets in the hours before game time—against the contract's settlement terms, which allow for postponement extensions and a 50-50 split in the event of cancellation.

Key catalysts include starting pitcher confirmation, which MLB clubs often delay until 24–48 hours before game time, and any injury updates to position players. Monitor weather forecasts for the Boston area and check for any league-wide scheduling adjustments. The divergence between the 0% prediction-market probability and likely sportsbook lines warrants direct comparison; if major books are offering the Diamondbacks at +150 or better, the prediction-market pricing may represent an arbitrage opportunity dependent on settlement mechanics and liquidity constraints.

Methodology

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

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.