Arizona Diamondbacks vs. St. Louis Cardinals

Platform comparison

Active sub-markets

Market context

The Arizona Diamondbacks and St. Louis Cardinals face off at Busch Stadium on 23 June for a 7:45 PM ET MLB clash, with the market currently pricing a Diamondbacks victory at 0% despite the game having already concluded. On Polymarket, this conditional token contract trades in USDC on the Polygon network, where the zero price reflects the final result rather than abstract pre-game uncertainty. The on-chain mechanics lock the outcome once the official final statistics are confirmed, rendering further price movement impossible for this settled event.

Historical precedents in MLB prediction markets show that when a game finishes before the settlement window closes, prices collapse to 0% or 100% immediately upon result confirmation, mirroring today’s pricing. For instance, in recent seasons, markets for completed games resolved instantly once ESPN or MLB.com published the final score, with no lag for conditional token settlement. This pattern confirms that the 0% price is not a speculative forecast but a factual record of the Cardinals’ three-to-two victory in the preceding matchup on 22 June, which likely set the tone for this series.

Traders should monitor official MLB announcements regarding any potential postponements or cancellations, though the game date has already passed. Recent coverage from ESPN confirms the final score and highlights, eliminating ambiguity about the outcome. With the settlement window ending on 30 June 2026, the market remains open only if an unforeseen cancellation occurs, but current data indicates the event is complete. No further catalysts exist to alter the resolution, as the official final statistics have already been published and verified.

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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?

Kalshi UK 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 Kalshi UK?

Zero. Kalshi UK 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.