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 71 per cent. Houston enters the fixture with a stronger record and has maintained consistency in the AL West, whilst the Cubs remain below .500 in the NL Central. The Astros' pitching depth, anchored by their established rotation, has been a differentiator in close contests this season, whereas Chicago has cycled through multiple starting pitchers due to injury.

Historical matchups between these clubs show the Astros have won 11 of their last 17 meetings dating back to 2022, a stretch that reflects Houston's sustained competitive advantage. The Cubs' record against winning teams sits notably below their overall win percentage, suggesting they struggle disproportionately against stronger opposition—a pattern that contextualises the current 71 per cent probability as reasonable rather than extreme.

Traders should monitor roster updates through 22 May, particularly any late-inning bullpen availability for either side. The Cubs' recent injury report, as covered by the Chicago Tribune's beat reporters, flagged uncertainty around their starting catcher and two relief arms heading into the weekend. Weather conditions at Wrigley Field may also shift betting patterns if rain threatens the scheduled 2:20 PM start; the settlement window extends to 30 May to accommodate postponements. Houston's recent form against left-handed starters will matter if the Cubs deploy their southpaw starter, a variable that typically narrows the Astros' historical edge.

Methodology

This page reviews Houston Astros vs. Chicago Cubs across five venues. We show live odds for Polymarket-based markets (sourced from the Polygon order book); for other venues we list platform attributes, since the comparable contracts are not exposed via a public API on every venue. Every CTA points at PolyGram — the application we operate, where you trade directly against the Polymarket order book at 0% fees.

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.

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.

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.

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.