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 securing a 6–3 victory in the final contest to win the series two games to one [1][2]. This outcome caps a split where the Giants dominated the opener with a 7–0 shutout before the Mariners rebounded decisively in the subsequent two matches [9][1]. The prediction market in question, which offered a binary resolution on the winner of the 19 July game, now carries a 0% implied probability for the Giants because the event has already concluded and the Mariners won outright [1][3].

Historically, prediction markets on completed MLB games that retain open status post-result often reflect a lag between official settlement and market closure, but a 0% probability for the losing side is the standard equilibrium once the final score is confirmed [2][6]. In comparable cases where a game finishes before the settlement window expires, the market resolves immediately to the actual winner, rendering any lingering YES probability for the loser mathematically null. The divergence here is stark: sportsbooks priced the Mariners at −196 moneyline (roughly 66% implied win probability) before the game, while the prediction market’s current 0% reflects the settled reality rather than pre-game uncertainty [3][7].

Traders should monitor the official resolution timestamp on the platform, as the market will close automatically once the final statistics are ingested from the MLB official feed [2]. No further catalysts exist, as the game is complete and no postponement or cancellation applies; the only dependency is the platform’s confirmation of the 6–3 result [1][6]. With the series over and the Mariners having won the decisive third game, the contract’s outcome is fixed, and any remaining liquidity on the Giants side is effectively worthless [1][3].

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 PolyGram, 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

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.

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.