San Francisco Giants vs. Arizona Diamondbacks

Platform comparison

Active sub-markets

Market context

Polymarket is pricing the San Francisco Giants at about 66% for tonight’s game against the Arizona Diamondbacks, with the contract settling on the MLB official result and paid out in USDC on Polygon through conditional tokens. At that level, the market is leaning to San Francisco, but it is not treating the game as close to a lock; a one-third implied chance for Arizona still reflects normal baseball volatility, especially in a single nine-inning contest where late scoring swings can decide the outcome.

Recent form does not point strongly one way. The Giants opened the series with a 12-2 loss on 18 May, then Arizona edged San Francisco 5-3 the following day on Ketel Marte’s ninth-inning three-run homer, which shows how quickly the price can move on one game of fresh evidence. Over a broader sample, San Francisco has still controlled the head-to-head more often than not, and MLB preview material notes Justin Verlander has been effective this month, while Brandon Pfaadt has struggled in five career starts against the Giants, going 0-4 with a 5.11 ERA. Those are the kinds of splits that typically support a favourite rating in the low-to-mid 60s rather than a much stronger number.

For traders, the key catalysts are the confirmed line-ups, any late pitching change, and whether the bullpen usage from the last two games affects availability. The game is scheduled for 3:40pm ET, so any scratch or weather-related delay before first pitch can matter because the contract remains live until the match is completed, and postponement only pushes settlement rather than closing it. If the teams play as listed, the final score from the official MLB record is what decides the conditional tokens, so late defensive substitutions, opener usage, or an unexpected exit by the starter are all relevant to how a 66% price should be read.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews San Francisco Giants vs. Arizona Diamondbacks 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

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.

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.

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.

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.