San Francisco Giants vs. Seattle Mariners

Platform comparison

Market context

The San Francisco Giants and Seattle Mariners played their July 19 MLB matchup at T-Mobile Park, with the Mariners securing a decisive 6–3 victory [1]. The game, scheduled for 4:10 PM ET, featured probable pitchers Robbie Ray and Logan Gilbert, and was broadcast on Mariners.TV and NBCS BA [2]. As the contest has already concluded, the prediction market for this game now reflects a settled outcome rather than a live probability.

Historically, MLB prediction markets that resolve post-game show immediate price convergence to 100% for the winning side once official results are confirmed, leaving no room for uncertainty. In this case, the 0% YES crowd-implied probability aligns with the Mariners’ win, as the market correctly prices the Giants’ chance of victory at zero after the final score was recorded [1]. Past cases of similar resolved games on Polymarket demonstrate that conditional tokens settle instantly upon official stat confirmation, with USDC payouts distributed automatically on the Polygon network.

Traders should monitor the official final statistics page for any late adjustments, though no such changes are expected given the clear 6–3 result [1]. The settlement window ending 2026-07-26 allows ample time for the platform to process the outcome, but the result is already definitive. With the game completed and the winner confirmed, the market’s 0% probability for the Giants is not a forecast but a reflection of the completed event.

Sources: 1 · 2 · 3

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

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 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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like PolyGram trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

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.