St. Louis Cardinals vs. Arizona Diamondbacks

Platform comparison

Market context

The Arizona Diamondbacks defeated the St. Louis Cardinals 8–7 in a walk-off victory on Sunday, 19 July 2026, at Chase Field, completing a dramatic rally from a seven-run deficit in the 10th inning [1]. This result confirms the game has already concluded, meaning the prediction market titled “St. Louis Cardinals vs. Arizona Diamondbacks” is effectively settled despite its stated 2026 settlement window. The crowd-implied probability of 0% YES for the Cardinals aligns precisely with the official outcome, as the Diamondbacks secured the win.

Historically, MLB prediction markets on Polymarket resolve instantly once official final statistics are published, regardless of delayed settlement windows, particularly when the outcome is unambiguous [1]. Comparable cases show that conditional tokens on Polygon settle to the winning team’s USDC payout once the primary resolution source—here, the official final stats—confirms the result, rendering the 0% price a factual reflection of the completed event rather than a speculative forecast.

Traders should monitor the official final statistics page for the 19 July game to confirm resolution timing, as Polymarket’s smart contracts auto-execute upon data ingestion from the primary source [1]. No further announcements or schedule changes are relevant, given the game’s completion; the only dependency is the platform’s verification of the 8–7 scoreline, which already validates the Diamondbacks’ win and nullifies any Cardinals payout.

Sources: 1 · 2 · 3

Methodology

We track St. Louis Cardinals vs. Arizona Diamondbacks across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like PolyGram trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

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.