Arizona Diamondbacks vs. St. Louis Cardinals

Platform comparison

Active sub-markets

Market context

The underlying event is an MLB game between the Arizona Diamondbacks and the St. Louis Cardinals, scheduled for 7:45pm ET on 22 June at Busch Stadium in St. Louis. The market resolves to "Arizona Diamondbacks" if they win, and to "St. Louis Cardinals" if they win; a postponement keeps the market open until completion, while a cancellation or tie triggers a 50-50 split.

Historical MLB matchups between these clubs show Merrill Kelly holds a 2–1 record with a 2.25 ERA in four career games against the Cardinals, while Andre Pallante (now replaced by Ryne Stanek) posted 5–1 with a 3.20 ERA across seven starts before the pitching change [1][3]. Comparable games where a pitcher with a sub-2.50 ERA faced a mid-3.00 ERA opponent often produced single-digit win probabilities for the underdog, aligning with the current 14% YES price for Arizona.

Traders should monitor the official starting lineups for the pitching swap, any late-injury reports for key hitters, and the weather forecast for Busch Stadium, as rain delays could postpone the game and extend the settlement window [1]. The Athletic notes that lineup confirmations typically occur 30 minutes before first pitch, making that the critical moment for assessing Kelly’s readiness against Pallante’s replacement [7]. Accessibility is shaped by regulatory frameworks: German GlüStV implications and US CFTC reach define the legal perimeter, while the "no-KYC up to $1,500" rule means users can access this market without identity verification for stakes under that threshold, provided they comply with local jurisdictional rules.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Arizona Diamondbacks vs. St. Louis Cardinals 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

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 does it cost to trade on Polymarket KYC UK?

Zero. Polymarket KYC 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 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, Polymarket KYC UK 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.