Colorado Rockies vs. Arizona Diamondbacks

Platform comparison

Active sub-markets

Market context

The Colorado Rockies host the Arizona Diamondbacks in a scheduled MLB game on 22 May at 9:40pm ET, and the market is currently pricing Colorado at 34% to win. For a programmatic trader, that makes the price closer to a live underdog ticket than a routine home-field adjustment, so it is worth comparing the implied probability against similar Coors Field spots rather than treating it as a flat team-strength number. Recent market and preview pages have had Arizona as a clear favourite, with one listing the Diamondbacks around 63% to 71% on the moneyline, which leaves Colorado’s side meaningfully discounted but not impossible in a high-variance park.

The main historical lens is the Coors Field effect: totals and win probabilities tend to move sharply once line-ups and pitching are confirmed, because altitude inflates run-scoring variance and weak bullpens can undo pre-game edges quickly. Recent game coverage and preview material on MLB and odds sites has pointed to Arizona having the cleaner bullpen numbers, while Colorado’s recent results and pitching depth have kept them in the underdog bucket. For a bot or conditional-order setup, the useful comparison is whether the market is drifting with the confirmed starter split, late line-up scratches, or bullpen fatigue from the previous two games in the series.

The key catalysts are official line-ups, starter confirmations and any weather or delay news before first pitch; those inputs can change the fair price more than team reputation does. Because the settlement window runs to 30 May, the market can also stay open if the game is postponed, so automated strategies should monitor MLB’s official game status and the final statistics feed rather than assuming same-day closure. In practical terms, copy-trading or laddered orders around this market usually work best if they are tied to the confirmed pitchers and batting orders, since that is where the largest pre-game repricing typically occurs.

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Methodology

This page is a comparison snapshot: one live quote (Polymarket), 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

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 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.