Milwaukee Brewers vs. Houston Astros

Platform comparison

Active sub-markets

Market context

The Milwaukee Brewers travel to Houston on 31 May for a day game against the Astros, with first pitch at 2:10 PM ET. Polymarket currently prices the Brewers' victory at 45 per cent in USDC on Polygon, implying the Astros hold a 55 per cent edge in conditional token markets. This pricing reflects Houston's stronger 2025 regular season record and home-field advantage, though the settlement window extends to 7 June to accommodate any postponements.

Historically, the Brewers perform competitively against Houston despite the Astros' recent divisional dominance. Head-to-head records between these franchises show relatively balanced outcomes when Milwaukee's rotation is healthy, particularly when facing non-elite Astros pitching. The current 45 per cent probability for a Brewers win sits near the midpoint of typical road-team valuations in similar matchups, suggesting the market has priced in neither team as a heavy favourite despite Houston's home status.

Traders should monitor starting pitcher announcements, typically confirmed 24–48 hours before game time, as rotation health significantly shifts these odds. Any late-season injuries to either team's key position players or bullpen arms could trigger repricing. Weather conditions at Minute Maid Park—particularly humidity and wind patterns affecting ball carry—historically influence run totals and thus win probability. Recent form matters considerably; a string of losses immediately preceding 31 May would likely compress the Brewers' probability further, whilst a winning streak could narrow Houston's edge.

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

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

Is this market available outside the US?

Polymarket UK is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

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.