St. Louis Cardinals vs. Arizona Diamondbacks

Platform comparison

Market context

The Arizona Diamondbacks defeated the St. Louis Cardinals 8–7 on 19 July 2026 at Chase Field, completing a dramatic walk-off rally from a seven-run deficit in the 10th inning [5]. This result concluded a three-game regular-season series in which the Cardinals won the opener 5–4 on 17 July before losing the subsequent two matches [8][5]. With the game already played and settled, the prediction market’s 0% YES probability for a Cardinals win reflects the definitive outcome rather than pre-game uncertainty.

Historically, markets resolving after event completion show near-zero divergence between sportsbook moneylines and prediction-market implied probabilities once results are confirmed. In this case, the closing moneyline favoured the Diamondbacks at –126, while the Cardinals were listed at +108, aligning closely with the actual 8–7 result [7]. The 0% implied probability on the YES contract (Cardinals win) is consistent with post-game settlement logic, where no further odds movement is possible once the outcome is fixed.

Traders should monitor official MLB final statistics for any rare post-game adjustments, though no such changes are expected for a completed regular-season game [4]. The probable pitchers for this matchup were Andre Pallante and Eduardo Rodriguez, but their roles are now irrelevant given the game’s conclusion [4]. With the settlement window ending 26 July 2026, the market will resolve definitively to “Arizona Diamondbacks” based on the confirmed 8–7 scoreline [5]. No further catalysts, announcements, or schedule dependencies apply.

Sources: 1 · 2 · 3 · 4 · 5

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

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Best Prediction Markets. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

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 Best Prediction Markets 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.