Houston Astros vs. Chicago Cubs

Platform comparison

Active sub-markets

Market context

The Houston Astros travel to Chicago to face the Cubs on 23 May at 2:20 PM ET, with the market currently pricing an Astros victory at 68% implied probability across major platforms. This probability spread reflects meaningful divergence between venues: Polymarket's decimal odds (approximately 3.1 for an Astros win) imply slightly tighter margins than Kalshi's equivalent pricing, whilst Betfair's fractional display (roughly 11/5) appeals to traders accustomed to traditional bookmaker conventions. Fee structures matter here—Kalshi's flat settlement fees and Polymarket's 2% taker charge create different break-even thresholds for positions held through the settlement window on 30 May.

Historical matchups between these franchises show the Cubs have won 52 of 107 meetings since 2012, though the Astros' 2017 World Series run and subsequent divisional consistency have shifted recent dynamics. The 68% probability aligns with Houston's stronger 2024 regular-season record and superior run differential, factors that typically anchor pre-game markets before roster announcements or weather developments shift pricing. Traders should monitor starting pitcher confirmations—neither team had finalised their rotation as of late May—and any last-minute injury reports affecting position players or bullpen depth.

The settlement window extends to 30 May to accommodate potential postponements, a detail that distinguishes this market from same-day resolution offerings on some platforms. Smarkets' liquidity on this fixture remains lower than Polymarket or Kalshi, creating wider bid-ask spreads for traders seeking to exit positions before game time. Weather forecasts for Chicago on 23 May and any roster moves announced in the preceding week represent the primary catalysts likely to shift the current 68% baseline.

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

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.

What does it cost to trade on PolyGram?

Zero. PolyGram routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

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.

Do I need to KYC for this market?

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