St. Louis Cardinals vs. Milwaukee Brewers

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Active sub-markets

Market context

The St. Louis Cardinals face the Milwaukee Brewers on 27 May at 1:40 PM ET in a regular-season Major League Baseball fixture. The current crowd-implied probability of 40% for a Cardinals victory reflects modest confidence in the visiting side, suggesting the market perceives the Brewers as slight favourites in this divisional matchup. Settlement occurs by 3 June 2026, with the official final statistics from MLB serving as the authoritative resolution source.

Historical performance between these National League Central rivals provides context for interpreting the 40% Cardinals probability. Over the past five seasons, the Cardinals have maintained a competitive record against Milwaukee, though recent form favours neither club decisively. The Brewers' home-field advantage at American Family Field typically commands a 2–3 percentage-point edge in comparable matchups. Current season standings, injury reports, and recent win-loss streaks—particularly for starting pitchers assigned to this fixture—have historically moved probabilities by 5–8 points in similar divisional games, suggesting the current 40% reflects baseline expectations rather than material new information.

Traders should monitor roster announcements through 26 May, particularly confirmation of starting pitchers and any late-notice injuries affecting position players. Weather conditions at Milwaukee, including wind direction and temperature, influence run-scoring expectations and can shift probabilities by 2–4 points in afternoon games. From a regulatory standpoint, this market operates under German GlüStV provisions where applicable and remains accessible to traders in jurisdictions permitting no-KYC participation up to $1,500 notional value, though US CFTC reach extends to certain American participants regardless of account size. Settlement finality depends on MLB's official box score, with postponement provisions extending the resolution window beyond 3 June if necessary.

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

Where can I trade this market with the lowest fees?

On Polymarket Legal UK, 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.

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 Polymarket Legal UK?

Zero. Polymarket Legal 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.