San Francisco Giants vs. Arizona Diamondbacks

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Active sub-markets

Market context

Polymarket is pricing the San Francisco Giants at 43% for tonight’s game against the Arizona Diamondbacks, with USDC locked on Polygon and conditional tokens set to pay out to the winning side once the official result is posted. The contract is live for the May 20 first pitch in Arizona, so the key point for holders is that the market tracks the final MLB score, not pre-match sentiment or in-game momentum.

Recent head-to-head results give a mixed read rather than a clean edge. Arizona beat San Francisco 12-2 on Monday in the series opener, but the broader recent sample is tighter: StatMuse has the Diamondbacks and Giants level at 10-10 over their last 20 meetings. That sits alongside a longer history in which San Francisco has held the overall upper hand, so a mid-40s price is broadly consistent with a matchup where recent form and longer-term strength are pulling in opposite directions. ESPN also noted Arizona’s walk-off-style 5-3 win over the Giants earlier this week, underlining how quickly these games can swing late.

For traders, the main catalysts are the confirmed starters, bullpen availability and any late injury or lineup news before the 7:40pm UTC start. The market will stay open if the game is delayed or postponed and only settles once there is an official completion; if it is cancelled outright, or ends in a tie, it resolves 50-50. That means the most relevant updates are any pre-game team announcements, weather changes and pitching changes that alter the expected run environment rather than the opening price alone.

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Methodology

We track San Francisco Giants vs. Arizona Diamondbacks 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

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.

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.