Arizona Diamondbacks vs. Cleveland Guardians

Platform comparison

Market context

Polymarket is pricing the Arizona side at **39% YES**, which implies a **61%** Guardians outcome after fees and market depth are taken into account. On-chain, that view is expressed through USDC collateral on Polygon and settled via conditional tokens, so the contract will pay out according to the official result rather than the live score. If the game is postponed, the market stays open until completion; if it is cancelled outright or ends tied, it resolves 50-50 under the market rules.

That pricing sits below most sportsbook moneylines and model-based previews, which generally have Cleveland as a modest favourite. Recent market screens showed Guardians prices around the -160 to -180 range and Diamondbacks around +140 to +150, while some odds feeds have had Arizona closer to the low-40s in implied win probability and others nearer 50/50 depending on the book and timing. For a Polymarket user, the key read-through is that 39% is not an abstract forecast but the crowd’s tradeable belief after accounting for the possibility of postponement, late lineup changes and the venue-specific edge of Cleveland’s home field.

The main catalysts are the final pitching assignments, any late scratches, and weather or scheduling announcements that could affect whether the game is played as planned. Sportsbooks and preview sites have been updating odds into game day, which usually means the contract can reprice quickly if a starter changes or if the total shifts materially, since those moves often alter the win probability before first pitch. Traders should also watch for any official MLB announcement on delay risk, because a postponed game leaves the market open rather than forcing an immediate result, while a suspended or completed game follows the final stats source for settlement.

Sources: 1 · 2 · 3 · 4 · 5

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 PolyGram, 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?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is PolyGram. 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.

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.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

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.