Resolution criteria on PolyGram: In the upcoming MLB game between the Seattle Mariners and Chicago White Sox, scheduled for May 9 at 7:10PM ET: This market will resolve to "Seattle Mariners" if the Seattle Mariners win the game. This market will resolve to "Chicago White Sox" if the Chicago White Sox win the game. If the game is postponed, this market will remain open until the game has been completed. If the game is canceled entirely, with no make-up game, or ends in a tie, this market will resolve 50-50. The primary resolution source for this market is the official final statistics of the event as recognized by the governing body or event organizers.
PolyGram is an on-chain prediction market where you trade YES or NO outcome shares with real USDC on Polygon. For this market, buy YES if you believe the event will happen, or NO if you think it won't. Your maximum loss is your stake — winning shares pay $1.00 each at resolution. Unlike sportsbooks, there is no house edge: prices are set by supply and demand from other traders and reflect the crowd's real-time probability.
Market outcomes
| Seattle Mariners vs. Chicago White Sox | 49% YES | 52% NO |
| NRFI | 60% YES | 40% NO |
| Spread -1.5 | — | |
| Spread -1.5 | 57% YES | 43% NO |
| O/U 8.5 | 56% YES | 45% NO |
| O/U 9.5 | 44% YES | 56% NO |
The Seattle Mariners face the Chicago White Sox on 9 May at 7:10 PM ET in an early-season MLB matchup. The current order book on Polymarket reflects a 55% implied probability for a Mariners victory, suggesting modest favouritism for the home team despite both clubs being in competitive division races. This probability has formed through active trading on the platform's order book, where the spread between bid and ask prices indicates moderate confidence in either outcome rather than consensus conviction.
Historically, the Mariners have maintained a slight edge in recent head-to-head records, though both franchises have experienced significant roster turnover in recent seasons. The White Sox have struggled with consistency, whilst the Mariners have invested in pitching depth—a factor that typically influences single-game outcomes more substantially than seasonal records. Early May matchups often reflect pre-season expectations before injury patterns and performance trends fully crystallise, making the 55% probability reasonable rather than extreme.
Key variables for traders include starting pitcher assignments, which typically drive meaningful probability shifts in the days preceding first pitch, and any late roster moves or injury announcements. Weather conditions at the venue and recent offensive performance streaks in the preceding week warrant monitoring. The settlement window extends to 16 May, allowing for postponements or rescheduling, which historically affects roughly 1–2% of regular-season games annually. Current order book depth will indicate whether the 55% figure reflects genuine disagreement or thin liquidity.
This market settles from the official outcome published at https://www.mlb.com/. A proposer submits the final result to the UMA optimistic oracle on Polygon; the two-hour dispute window closes and payouts clear in USDC.
The mechanics for trading "Seattle Mariners vs. Chicago White Sox" are the same as any other PolyGram sporting event contract. Each YES share resolves to $1 if the event happens, or $0 if it doesn't. The current price between 0¢ and 100¢ is the market's probability estimate, set live by the order book.
$116K in lifetime turnover and $575K of resting liquidity puts this market in the top 30% by volume for sports contracts on PolyGram. Order-book depth is exceptional — among the deepest order books in the category.
Last 24 hours alone saw $116K in turnover, well above the lifetime daily-average for this market — a clear sign of news catalysing trader activity right now.
The market has been open for under a month — fresh enough that information asymmetry remains a real factor.
Higher-volume markets tend to have tighter spreads and faster price discovery — meaning the displayed YES/NO percentages are more likely to reflect the true crowd-implied probability rather than a single trader's directional view.
Resolution is sourced from https://www.mlb.com/. Settlement is executed by the UMA optimistic oracle on Polygon, with a 2-hour dispute window before payouts clear.
This prediction market is scheduled to close on 16 May 2026. After the resolving event occurs, settlement typically clears within 24 hours once the UMA optimistic oracle confirms the outcome. All payouts are in USDC on the Polygon network.
To trade on this prediction market, create a free PolyGram account at polygram.ink, deposit USDC via Polygon, and place a YES or NO order on the outcome you believe in. You can learn more on our how-it-works page. Your maximum loss is limited to your stake — there is no leverage or margin.
When the outcome is determined, winning YES shares pay out $1.00 each in USDC, while losing shares pay $0. Settlement is handled by the UMA optimistic oracle on Polygon — a proposer submits the result, a two-hour dispute window opens, and if uncontested, payouts are distributed automatically. You can withdraw your winnings to any Polygon wallet.
Prediction-market positions can lose 100% of staked capital. Outcomes are uncertain by definition — historical accuracy of crowd-implied probabilities is high in aggregate but not for any single market. PolyGram does not provide investment advice. Trade only with capital you can afford to lose.
Regulatory status varies by jurisdiction. Germany, the United States, and most EU countries treat Polymarket-style event contracts under one of three frameworks: financial derivative, gambling product, or unregulated novel asset. Consult local counsel before trading.
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