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Explainer · live examples updated September 24, 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.
O/U 7.5 99.9%+ · 13 live outcomes · $673.8K traded in 24h
Rules excerpt from Polymarket: “In the upcoming MLB game between the Houston Astros and Seattle Mariners, scheduled for September 23 at 10:10 PM ET: This market will resolve to "Over" if the Houston Astros and Seattle Mariners combine to score 8 or more runs in this game. If the combined total is less than 8, this market will resolve to "Under". If the game is postponed, this market will remain open until the game has been completed. If the game …”
O/U 25.5 93% · 43 live outcomes · $610.6K traded in 24h
Rules excerpt from Polymarket: “In the upcoming NFL game, scheduled for September 24 at 8:15 PM ET: This market will resolve to "Over" if the Falcons and Packers combine to score 26 or more points in this game. If the combined total is less than 26, this market will resolve to "Under". 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, this market will …”
O/U 9.5 99.9%+ · 13 live outcomes · $605.0K traded in 24h
Rules excerpt from Polymarket: “In the upcoming MLB game between the Los Angeles Angels and Athletics, scheduled for September 23 at 9:40 PM ET: This market will resolve to "Over" if the Los Angeles Angels and Athletics combine to score 10 or more runs in this game. If the combined total is less than 10, this market will resolve to "Under". If the game is postponed, this market will remain open until the game has been completed. If the game is …”
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
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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