St. Louis Cardinals vs. Milwaukee Brewers

Platform comparison

Active sub-markets

Market context

The Cardinals travel to Milwaukee on 25 May for a day game against the Brewers, with first pitch at 2:10 PM ET. Polymarket currently prices Cardinals victory at 35 cents per share, implying roughly a one-in-three chance of a St. Louis win. This valuation reflects the Brewers' home-field advantage and recent form, though the Cardinals remain competitive within the National League Central division structure.

Historical matchups between these rivals show the Brewers have held a slight edge in recent seasons, particularly at American Family Field. Over the past three years, Milwaukee has won approximately 55 per cent of head-to-head contests, a differential that typically translates to roughly 10–15 percentage points in market pricing for home games. The Cardinals' 35 per cent probability sits slightly below this historical baseline, suggesting the market may be pricing in additional factors beyond typical home-field advantage—potentially roster availability or recent performance trends entering late May.

Traders should monitor starting pitcher announcements, which typically arrive 24–48 hours before game time, as pitching matchups materially shift conditional token valuations on Polygon. Injury reports from both clubs matter considerably; the Cardinals' outfield depth and the Brewers' bullpen health have proven decisive in close contests this season. Weather conditions at game time—Milwaukee's lakeside location can produce variable wind patterns affecting fly-ball outcomes—occasionally move markets in the final hours before settlement.

Methodology

We track St. Louis Cardinals vs. Milwaukee Brewers 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

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.

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.

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.