San Francisco Giants vs. Seattle Mariners

Platform comparison

Market context

The San Francisco Giants face the Seattle Mariners tonight at 10:10pm ET in a crucial MLB matchup, with the crowd currently pricing a Giants victory at 37% YES. On Polymarket, this contract trades on USDC over Polygon, where conditional tokens lock in the 50-50 tie/cancellation clause and the on-chain settlement window extending to 25 July 2026.

Historically, mid-July home favourites in MLB with odds around −198 to −200 resolve to wins roughly 65–67% of the time, aligning closely with the 66% implied by Seattle’s betting odds at DraftKings[2]. When a team holds a heavy home favourite status like Seattle’s −198 price, the market often corrects from initial underpricing within 24 hours, suggesting the current 37% Giants probability may be slightly soft relative to the underlying win likelihood.

Traders should monitor the official starting lineups released by MLB around 8pm ET, as pitcher availability is the primary catalyst for this contract’s resolution. Any late injury news to Seattle’s ace or a Giants bullpen reshuffle could shift the on-chain price sharply, especially given the heavy home favourite status noted in pre-game betting splits[2]. Watch for the final roster confirmation on MLB.com before the 10:10pm ET start, as postponed games keep the market open but delayed lineups introduce volatility.

Sources: 1 · 2

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to PolyGram, which mirrors the Polymarket order book directly.

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?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is PolyGram. 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.

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 Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

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.