Milwaukee Brewers vs. Houston Astros

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Active sub-markets

Market context

The Milwaukee Brewers travel to Houston on 31 May for a 2:10pm ET matchup against the Astros. Polymarket currently prices a Brewers victory at 22%, implying roughly 78% confidence in an Astros win. This gap reflects Houston's standing as a stronger franchise this season, though the conditional token mechanics on Polygon mean the price can shift rapidly if new information emerges before settlement on 7 June.

Historical matchups between these clubs show the Astros have held a competitive edge in recent seasons, winning their division consistently whilst the Brewers compete in a tighter NL Central. When comparing similar regular-season games between mid-tier and stronger teams, markets typically price the favourite at 65–80%, so the current 78% for Houston sits within expected ranges. The Brewers' 22% reflects their status as a visiting underdog rather than an outlier mispricing.

Traders should monitor starting pitcher announcements, which typically arrive 24–48 hours before game time and can shift probabilities materially depending on injury status or recent form. Weather conditions in Houston—particularly heat and humidity affecting ball carry—occasionally influence totals markets and can indirectly affect win probability. Any roster moves, bullpen availability reports, or unexpected postponements would trigger recalibration of the USDC-denominated contract before the settlement window closes.

Methodology

We track Milwaukee Brewers vs. Houston Astros 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

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?

On Polymarket Legit?, 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.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Polymarket Legit? triggers a quick verification flow that finishes in 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.