Houston Astros vs. Chicago Cubs

Platform comparison

Active sub-markets

Market context

The Houston Astros travel to Chicago to face the Cubs on 24 May at 2:20 PM ET in a regular-season MLB matchup. The crowd-implied probability of 51% for an Astros victory reflects a near-even contest, though this probability sits at different decimal odds across platforms: Polymarket displays it as approximately 2.0, whilst Kalshi's binary structure and Betfair's fractional odds (roughly 1/1) convey identical expected value through different notation systems. Fee structures diverge meaningfully—Kalshi charges no trading fees on sports markets, whereas Polymarket applies a 2% settlement fee, and Betfair's commission scales with volume, affecting the true cost of entry for this particular matchup.

Historical matchups between these franchises show competitive balance over recent seasons, though the Astros hold a slight edge in head-to-head records since 2020. The Cubs' 2024 roster retains core contributors like Cody Bellinger and Nico Hoerner, whilst the Astros' lineup centres on Kyle Tucker and José Altuve. Pitching assignments remain the critical variable; starting pitcher quality typically shifts implied probabilities by 3–5 percentage points in baseball markets, and neither team's rotation depth is uniform.

Traders should monitor weather conditions in Chicago—wind direction and temperature materially affect fly-ball outcomes at Wrigley Field—and any last-minute injury reports released before first pitch. Recent form matters less in single-game markets than roster availability. The settlement window extends to 31 May, providing buffer for postponements, though cancellation without a make-up game would trigger a 50-50 split under stated terms.

Methodology

This page compares Houston Astros vs. Chicago Cubs specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. Live odds come from the Polymarket order book; the other venues' contract details are maintained manually because their APIs aren't directly comparable. Every CTA routes to PolyGram, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Settlement is the biggest difference between the four platforms: Polymarket on-chain in USDC (instant), Kalshi USD via CFTC (T+1), Betfair and Smarkets in local currency via bank withdrawal (T+1 to T+3). PolyGram routes every trade directly into Polymarket's on-chain settlement, which is why payouts land fastest.

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.

Is this market available outside the US?

PolyGram 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.

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.