Houston Astros vs. Chicago Cubs

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Active sub-markets

Market context

The Chicago Cubs host the Houston Astros on 22 May, with the contract pricing Houston at 43% to win outright. That sits below the near-even view on Polymarket, where the Cubs are quoted slightly ahead at about 51% versus 49%, and below the broader tone from the matchup preview, which gives Chicago the edge on record alone. ESPN lists the Cubs at 29-21 and the Astros at 20-31, but Houston still enters on the back of a 2-0 shutout in this same series, which is a useful reminder that one-game baseball probabilities can move sharply on pitching and line-up context rather than season record.

For traders, the main dependencies are the confirmed starters, any late line-up rests, and whether the market is reacting to the Cubs’ recent form or to Houston’s ability to suppress scoring in this series. ESPN notes Chicago taking a five-game losing streak into the game, while the market rules mean any postponement keeps the contract open until completion, and only a cancellation or tie would force a 50-50 settlement. The 43% yes price therefore implies a meaningful gap between market-implied Houston chances and the more Cubs-favoured read on some other venues, so late team news and betting-market moves are likely to matter more than season-long standings.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Houston Astros vs. Chicago Cubs 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

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

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.

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.