Arizona Diamondbacks vs. San Francisco Giants

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Active sub-markets

Market context

The Arizona Diamondbacks face the San Francisco Giants on 25 May at 5:05 PM ET in a regular-season National League West matchup. The 98% crowd probability heavily favours Arizona, suggesting market participants view the Diamondbacks as clear favourites for this encounter. Resolution depends on official MLB final statistics, with postponement extending the settlement window through 1 June and cancellation triggering a 50-50 split.

Historical context for NL West divisional games shows that home-field advantage and recent form typically drive probability clusters above 70%, though 98% implies either significant roster disparity or recent performance divergence. In comparable May matchups between these franchises over the past three seasons, probabilities rarely exceeded 85% unless one team held a double-digit game differential. The current reading suggests either the Diamondbacks enter with exceptional momentum or the Giants face documented injury concerns that the market has priced in decisively.

Traders monitoring this market programmatically should track lineup announcements and weather conditions at the venue, as late scratches or field delays can shift pricing. Recent injury reports, bullpen availability, and starting pitcher confirmation typically arrive within 24 hours of first pitch. The Giants' recent performance against left-handed starters and the Diamondbacks' home record in May provide quantifiable data points for conditional order logic. Given the extreme probability, any material roster news—particularly concerning Arizona's starting pitcher or Giants' key position players—could trigger sharp movement, making real-time feed integration valuable for detecting arbitrage opportunities before settlement.

Methodology

We track Arizona Diamondbacks 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

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

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.

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.

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.