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Explainer · live examples updated October 6, 2026, twice a day
Single-game markets cover who wins a match (the moneyline), whether a team covers a points spread, and whether the total score goes over or under a line. Each is a yes/no market or a two-sided market between the teams.
Prices move before and during the game; once the result is official the winning side pays $1 per share.
1st 5 Innings O/U 2.5 99.9%+ · 1 live outcome · $1.54M traded in 24h
Rules excerpt from Polymarket: “In the upcoming MLB game between the Chicago White Sox and Cleveland Guardians, scheduled for October 5 at 5:00 PM ET: This market will resolve to "Over" if the Chicago White Sox and Cleveland Guardians combine to score 3 or more runs by the conclusion of the 5th inning. If the combined total is less than 3, this market will resolve to "Under". If the game is postponed, this market will remain open until the 5th …”
Match Winner 99.9%+ · 7 live outcomes · $453.9K traded in 24h
Rules excerpt from Polymarket: “This market refers to the LoL Lower Bracket Semifinal match between KaBuM! Ilha das Lendas and 9z Globant in the CBLOL Promotion Playoffs, initially scheduled for October 5, 2026 at 5:00 PM ET. This market will resolve to "KaBuM! Ilha das Lendas" if KaBuM! Ilha das Lendas win the match against 9z Globant. This market will resolve to "9z Globant" if 9z Globant win the match against KaBuM! Ilha das Lendas. If the …”
New York Yankees O/U 3.5 64.5% · 13 live outcomes · $428.4K traded in 24h
Rules excerpt from Polymarket: “In the upcoming MLB game between the New York Yankees and Tampa Bay Rays, scheduled for October 5 at 8:00 PM ET: This market will resolve to "Over" if the New York Yankees run total in this game is equal to or exceeds the listed number. If the number of runs scored by the New York Yankees is less than the listed number of runs, this market will resolve to "Under". This market is based solely on the number of runs …”
The rules text on each market is what decides the outcome. Our market pages summarise it under “How this market resolves”, and how Polymarket resolves markets explains proposals, disputes and payout times.
Live odds: NFL odds · MLB odds · Sports odds
Work it out: Elo win probability calculator · sportsbook odds converter.
You trade shares against other users instead of betting against a bookmaker, so the price is set by the market and there is no built-in margin on both sides — only the spread and a small taker fee on some markets.
The market's rules define it; many resolve on the rescheduled game within a set window, others resolve to a stated default.
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