Colorado Rockies vs. Arizona Diamondbacks

Platform comparison

Active sub-markets

Market context

The Colorado Rockies meet the Arizona Diamondbacks in MLB action on 22 May, with the market currently pricing Arizona at 34% to win. That sits broadly in line with a strong favourite rather than a tight contest, and it reflects a familiar gap between the clubs: Colorado have been one of the league’s weakest sides in recent seasons, while Arizona have usually been the more competitive roster. Head-to-head results also tend to lean Arizona’s way, including a 14-8 Diamondbacks win in Phoenix in June 2025, which is the sort of recent comparable that helps explain why the crowd has not pushed this contract closer to even money.

For traders, the key variables are the starting pitchers, any late injury or rest news, and whether either side is managing workload around the schedule. The Diamondbacks’ line will move quickly if they announce a clear rotation advantage, while the Rockies’ price can shorten only if Arizona rests regulars or if there is an unexpected pitching change. Recent game coverage from MLB and ESPN shows these teams have produced high-scoring results, so bullpen availability may matter as much as the listed starters. In cross-platform terms, prediction-market pricing at 34% for Colorado implies Arizona as the clear side, and that is usually only materially different from sportsbook consensus if one market has priced in a late lineup edge or weather-related run environment.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). The odds column is filled only where we have clean data — that avoids the made-up numbers that get a network demoted when search engines cross-check against the source venue.

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

Is this market available outside the US?

PolyGram 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.

What does it cost to trade on PolyGram?

Zero. PolyGram routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

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.