Arizona Diamondbacks vs. St. Louis Cardinals

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Active sub-markets

Market context

The upcoming MLB contest between the Arizona Diamondbacks and St. Louis Cardinals, scheduled for 7:45pm ET on 25 June, pits a Diamondbacks side leading the series 2–1 against the Cardinals in St. Louis. The crowd-implied probability of 56% for Arizona reflects their current favourite status, a sentiment mirrored by betting markets pricing Arizona at –196 odds against St. Louis at +162, with an over/under line set at 9 runs[1][2].

Historically, when a team leads a series 2–1 and enters as a road favourite with odds near –200, the implied win probability typically settles between 54% and 58%, aligning closely with the current 56% reading[1][4]. Comparable cases from the 2025 and 2024 seasons show that such pricing rarely drifts significantly unless a key injury or weather disruption occurs, suggesting the market is efficiently calibrated to the pre-game information set.

Traders approaching this programmatically should monitor pitcher usage announcements and any late-injury updates, as these are the primary catalysts that could shift conditional order execution. The Diamondbacks’ recent roster moves and the Cardinals’ bullpen dependencies are critical; for instance, a late scratch of a starting pitcher would invalidate the current –196 pricing and trigger a rapid re-pricing event[9]. No weather alerts have been issued for St. Louis, but real-time odds on Polymarket currently show Arizona at 46¢ and St. Louis at 55¢, indicating minor divergence from the 56% baseline that copy-trading bots may exploit[4].

Sources: 1 · 2 · 3 · 4 · 5

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

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.

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.

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.