Chicago Cubs vs. San Francisco Giants

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Active sub-markets

Market context

On 13 June, the Chicago Cubs travel to San Francisco to face the Giants in a regular-season MLB matchup. In prediction markets, a YES share represents a bet on the Cubs winning; a NO share represents a bet on the Giants winning. The current crowd-implied probability of 52% YES reflects a near-even assessment, with Cubs backers holding a marginal edge. Settlement occurs after the game concludes, with the market remaining open if postponement occurs and resolving 50-50 only if the match is cancelled without a rescheduled date or ends in a tie—an exceptionally rare outcome in baseball.

Historical context suggests Cubs-Giants matchups often reflect broader divisional strength rather than consistent home-field advantage. Over the past five seasons, these teams have split regular-season series fairly evenly, though the Cubs have held a slight edge in head-to-head records. The current 52% probability sits close to the midpoint, indicating traders view neither team as a clear favourite based on recent form, roster composition, or ballpark factors.

Key variables affecting the outcome include starting pitcher matchups and recent offensive performance. Injury reports released in the days before 13 June will influence trading, particularly if either team's rotation or batting order faces unexpected absences. Weather conditions at Oracle Park—notably wind direction and temperature—can materially affect fly-ball outcomes. Traders should monitor official MLB injury announcements and team roster updates through early June, as these typically drive probability shifts in the final trading window before settlement on 21 June.

Methodology

We track Chicago Cubs vs. San Francisco Giants 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

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

Where can I trade this market with the lowest fees?

On Prediction Market UK, 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 Prediction Market UK?

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

Do I need to KYC for this market?

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