Colorado Rockies vs. Arizona Diamondbacks

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Market context

The Arizona Diamondbacks host the Colorado Rockies in a regular-season MLB game on 22 May, and this market pays out on the outright winner. In prediction-market terms, a YES share here means the Rockies win; a NO share means the Diamondbacks win. If the game is postponed, the market stays open until it is completed, while a cancelled game or tie resolves 50-50 under the market rules.

The crowd-implied 34% YES price suggests Colorado are seen as the underdog, which fits the broader recent record between the clubs. Arizona have won six of the last ten meetings with Colorado, and they also took the most recent game at Chase Field, beating the Rockies 2-1 on 21 May 2026. Over a longer sample, Arizona have had the stronger head-to-head record overall, so a sub-40% Rockies price is consistent with recent results rather than a misread of one game.

For traders, the main catalysts are the confirmed starting pitchers, late lineup changes, and any weather or schedule disruption, because those can move both the moneyline and the market’s implied probability quickly. The Rockies’ recent game action is a useful form guide, including their 2-1 loss to Arizona reported by CBS Sports, but the settlement still depends only on the final official result. If the game is delayed or suspended, the market remains live until Major League Baseball records a completed final score.

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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.

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.

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.