Colorado Rockies vs. Arizona Diamondbacks

Platform comparison

Active sub-markets

Market context

The Colorado Rockies travel to Arizona to face the Diamondbacks on 24 May, with first pitch at 4:10 PM ET. The current crowd-implied probability sits at 0% for a Rockies victory, suggesting the market has priced them as a near-certain underdog or that insufficient liquidity has formed around this fixture. This extreme skew warrants scrutiny, particularly given that both teams operate within the same division and possess comparable recent form trajectories.

Historically, single-game matchups between mid-table NL West competitors rarely settle at such extreme probabilities unless one team faces catastrophic roster depletion or scheduling disadvantage. The Rockies' Coors Field home-field advantage disappears in this road contest, but Arizona's marginal pitching depth and inconsistent offensive production through May have kept them from establishing dominant favourites status in comparable fixtures. The market's 0% reading suggests either a data-entry error, minimal order-book depth, or consensus that the Diamondbacks' recent form is substantially superior—a claim worth testing against actual win probability models.

Traders should monitor starting pitcher announcements, which typically arrive 24–48 hours before game time and materially shift single-game odds. Recent injury reports from both rosters, particularly any late-inning bullpen availability, will influence the closing line. Weather conditions at Chase Field in late May rarely prove decisive, though Arizona's dry heat can affect ball carry. The settlement window extends to 31 May, allowing for postponement resolution if weather or scheduling conflicts arise.

Methodology

We track Colorado Rockies vs. Arizona Diamondbacks on the five venues with material liquidity for prediction markets. Live odds come from the Polymarket Polygon order book — the only source that ships real-time data under an open licence. For Kalshi, Betfair and Manifold we list platform attributes (fee, KYC, settlement, payment) instead of fabricated odds, because their APIs use non-comparable contract definitions.

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

Where can I trade this market with the lowest fees?

On PolyGram, 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.

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.

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.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, PolyGram 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.