San Francisco Giants vs. Seattle Mariners

Platform comparison

Market context

The San Francisco Giants and Seattle Mariners completed their three-game series at T-Mobile Park on 19 July, with the Mariners winning the final contest 6–3 to take the series two games to one [1][6]. Luke Raley and Cole Young scored home runs in the Mariners’ victory, cementing their second-half opening win over the Giants [1]. The game finished after the settlement window deadline of 26 July 2026, meaning the market has already resolved based on the official result.

Historically, prediction markets showing 0% implied probability for a team to win a game that has already concluded indicate a settled outcome rather than an active betting opportunity. In comparable MLB contracts where the event date precedes the settlement window, markets close immediately once the final score is recorded by official sources [2][7]. The 0% YES probability here reflects that the Giants lost the game, not that the market is uncertain.

Traders should note that the probable pitchers Robbie Ray and Logan Gilbert were listed for this matchup, though lineups can change before first pitch [8]. With the game already played and the final score confirmed as 6–3 for Seattle, no further catalysts such as postponements or cancellations apply. The primary resolution source remains the official final statistics recognised by MLB, which confirm the Mariners’ win [2].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews San Francisco Giants vs. Seattle Mariners across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Kalshi vs Polymarket, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

FAQ

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Kalshi vs Polymarket. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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.

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.