General Rules
What kinds of markets are offered?
Polymarket US offers several types of sports Contracts:| Contract | What it covers | Example |
|---|---|---|
| Winner (w/o ties) | Which team/player wins a game | ”Which team will win, Lakers vs Celtics?” |
| Winner (w/ ties) | Which team/player wins a game or match (where a draw is a standard outcome, as in soccer) | “Will Man City vs Arsenal end in a draw?” |
| Spread | Whether a team wins by a certain number of points in a game | ”Will the Chiefs win by more than 7?” |
| Total | Whether the combined score for a game is over or under a threshold | ”Will the total score in the Patriots vs the Chiefs be over 47.5?” |
| Future | Who will win a championship, award, or tournament | ”Will the Lakers win the 2026 NBA Championship?” |
| Qualifier | Whether a team or player qualifies for an event | ”Will Duke make the NCAA Tournament Final Four?” |
How are markets settled?
All markets are settled using official results obtained through a hierarchy of source agencies. The primary source is the official governing body or sanctioning organization responsible for the event. If the primary source is unavailable, Polymarket US may reference secondary sources including official competition scorecards, referee or umpire reports, press releases, and results databases maintained by the governing body. If secondary sources are unavailable, Polymarket US may reference tertiary sources including the Associated Press, Reuters, ESPN, BBC Sport, official team and league websites, and major sports wire services or data providers. Settlement will be delayed if the official result is under review. If no official result is declared, the Contract settles at last fair market prices.How do ties and draws work?
It depends on the Contract type:- Winner (w/o tie): If the game ends in a tie with no winner declared, the Contract settles at $0.50.
- Winner (w/ tie): Three Contracts per game — Team A Win, Team B Win, and Draw. Exactly one settles at $1.00, the others at $0.00. Result is based on regulation time only.
- Spread: Half-point spreads (e.g., -3.5)
- Total: Half-point totals (e.g., over or under, above or below the threshold of 47.5) are used to avoid ties.
- Title Event: If multiple participants are declared co-winners, each winner’s Contract settles at $1.00 divided by the number of winners, rounded down to the nearest tick.
How does overtime work?
For game-level Contracts (Athletic Event, Athletic Spread, Total Score), overtime, extra time, extra innings, penalty shootouts, and tiebreakers are included by default unless otherwise specified in the Contract Terms — the official final result governs settlement. The exception here is soccer: for league matches (e.g., EPL, MLS regular season), the result at the end of regulation time (90 minutes plus stoppage) governs. Extra time and penalties are excluded because draws are a valid outcome.What happens if a game is postponed or rescheduled?
The settlement date moves to match the new event date. If the event is rescheduled earlier, the earlier date is used and the market result will remain valid based on the outcome on the earlier date. If the event does not take place before the Contract’s expiration date (usually two weeks after the scheduled date of the event), it’s treated as a cancellation and will resolve to the last fair market prices.What happens if a game is canceled or abandoned?
If an event is canceled and not rescheduled before the expiration date (typically two weeks), the Contract settles at last fair market prices. This includes games that are abandoned or suspended mid-play without the governing body declaring an official result.What happens if a player or team withdraws before the event?
It depends on the Contract type:- Game-level Contracts (Athletic Event, Athletic Spread, Total Score): The Contract settles at last fair market prices.
- Futures and qualifiers (Title Event, Athletic Qualifier): The withdrawn participant’s Contract settles at $0.00.
What happens if a player retires mid-event?
If the governing body declares a winner or an official result, that result governs settlement. If no official result is declared, the Contract settles at last fair market prices.What happens if there’s a forfeit?
The participant awarded the forfeit is deemed the winner. For spread and total score Contracts, the official forfeit score (e.g., 9-0 in baseball) is used. So, in that case the team that was -1.5 would resolve to $1.00 on their spread market and if the total was 8 the over would resolve to $1.00. For Winner with Ties markets, the market will resolve based on the participant who was awarded the forfeit and the ‘Tie’ Contract shall settle at $0.00.What happens if there’s a no contest?
If the governing body declares the event a no-contest, the Contract settles at last fair market prices. Example: If a UFC fight or a boxing match were to end in a no contest the Contract would settle at the last fair market prices before the announcement was made.What happens if a game is shortened or truncated?
If the governing body declares an official result (e.g., the MLB calling a baseball game after 5 innings due to weather per current league rule), that result governs settlement.What about replayed or protested games?
If a game is replayed in its entirety pursuant to a protest or governing body decision before the Contract’s expiration date, the replay result governs. If the replay happens after expiration, the original result stands and a new market is created for the replayed game on the later specified date.Can results change after settlement?
No. Once an outcome is determined by Polymarket US in accordance with the rules, that determination is final and shall not be subject to appeal or revision for purposes of settlement. Post-event disqualifications, appeals, revised scores, or court rulings after the expiration date do not affect settlement.Futures & Qualifiers
How does settlement work?
A futures market is settled using results from multiple different games or multiple rounds of a competition, such as a basketball league championship or who will win MVP for said league during their season. A market for a player or team may be settled to $0.00 as soon as it is known that they are no longer able to win or qualify. A Qualifier Contract resolves at $1.00 when the governing body officially declares that the participant has met the qualification criteria for said event. Qualification may be determined through any officially recognized path including league standings or points accumulation, tournament progression, direct selection or invitation by the governing body, or performance-based criteria. If multiple qualification paths exist, participant qualifies if they meet any of the official criteria established by the governing body.How do elimination and qualification work?
- Futures: If a team is eliminated from a championship (e.g., knocked out of the playoffs), their Contract settles at $0.00.
- Qualifiers: If a team cannot qualify for the specified event, or round of an event (e.g., a team is eliminated during the tournament stage and cannot make the playoffs), their Contract settles at $0.00.
What if a qualification determination is reversed before the expiration date?
If a participant initially qualifies or is eliminated for an event but that determination is later reversed, vacated, or reassigned before the Contract’s expiration date, the Contract will settle based on the final official determination as of the expiration date. Reversals, vacations, or reassignments announced after the expiration date do not affect settlement.Does a team or player clinching mathematically trigger settlement?
No. Qualifier Contracts settle only upon official confirmation by the governing body. Mathematical clinching, projected qualification, or third-party projections do not trigger settlement. The Contract will remain open until the governing body officially declares the participant’s qualification status.What if a participant qualifies due to another participant’s disqualification or withdrawal?
If a participant qualifies for an event as a direct result of another participant’s disqualification or withdrawal, and the governing body officially recognizes that qualification, the Contract resolves at $1.00. Official recognition by the governing body is required for settlement — advancement due to an unconfirmed disqualification or withdrawal does not trigger settlement.Does a venue change affect my Futures/Qualifiers Contract?
No. A venue change does not affect the validity or settlement of any Contract, as long as the governing body continues to sanction the event.Sport-Specific FAQs
Please note all game-level market rules apply for both pregame and in game trading, unless specifically stated otherwise.Tennis (WTA/ATP)
What is the settlement source?
All markets are settled using the official result published by the governing body of the tournament in which the match is played. For ATP and WTA tour events, this is the ATP and WTA respectively. For Grand Slams, this is the official tournament authority (USTA for the US Open, Tennis Australia for the Australian Open, FFT for Roland Garros, and the AELTC for Wimbledon). For all other sanctioned events including ITF circuit, NCAA, and UTR events, the official result as published on that tournament’s official website governs. For exhibition matches with no sanctioning body, Contracts settle at last fair market prices unless the tournament organizer declares an official result. In cases where the primary source is unavailable, Polymarket US may reference secondary sources including official tournament communications, referee or umpire reports, press releases, and results databases maintained by the governing body. If secondary sources are unavailable, Polymarket US may reference tertiary sources including the Associated Press, Reuters, ESPN, BBC Sport, official team and league websites, and major sports wire services or data providers. Settlement will be delayed if the official result is under review. If no official result is declared, the Contract settles at last fair market prices.What if a player gets a walkover?
A walkover in tennis happens before the match officially begins. If a player’s opponent withdraws before the first serve, the market Contracts settles at last fair market prices. This is a pre-event withdrawal.What if a player retires mid-match?
If a player retires mid-match (after first serve), whoever advances/wins per governing body rules is rewarded with a win and will resolve at $1.00. Regardless of how many games/sets were completed in the match, if a player retires after first serve, whatever the governing body rules to be the outcome will resolve at $1.00.What happens if a player defaults or gets disqualified?
If a player defaults for a code violation or is disqualified for the tournament for any reason the market will resolve based on the official result of the governing body of the tournament.What if the match is delayed or suspended for weather or another reason?
If the match is delayed and played before the expiration date (typically two weeks) such that a qualifying outcome occurs, the Contract will settle per the governing league rules. If the match is delayed or suspended for any reason but completed within the same tournament the Contract will settle per the official governing body result at $1.00. If the match is not completed before the Contract’s expiration date, the Contract will settle at last fair market prices.What if the match is in an untraditional format (e.g., 4-game sets)?
Traders are responsible for understanding the rules of the markets they are trading in. If the format of a tennis match differs from traditional ATP format, all markets will stand and be resolved on the official result of the governing league. Additionally, if match formats are updated for any reason mid-tournament across any governing league the official governing league result will be the outcome of the market.What happens if the venue or surface changes?
If a match is moved to a different venue, court type, or surface, but continues to be played before the expiration date between the same players, the market will remain open and trading will continue.What happens if I take a future on a player who does not play in the tournament?
Traders are responsible for understanding the risk associated with futures markets, including whether a player has qualified for, confirmed entry in, or withdrawn from a tournament. Polymarket US does not guarantee that any player listed in a futures market will participate. If a player does not compete for any reason, their Contract settles at $0.00. It is the trader’s responsibility to monitor player participation and tournament draw information prior to and during the event.Baseball (MLB)
What is the settlement source?
All markets are settled using the official result published by Major League Baseball (MLB) as reflected on MLB.com. In cases where MLB.com is unavailable or has not yet published the official result, Polymarket US may reference secondary sources including official MLB communications, umpire reports, press releases, and results databases maintained by MLB. If secondary sources are unavailable, Polymarket US may reference tertiary sources including the Associated Press, Reuters, ESPN, BBC Sport, official team and league websites, and major sports wire services or data providers. Settlement will be delayed if the official result is under review. If no official result is declared, the Contract settles at last fair market prices.What are the game thresholds by market type?
All markets follow the same universal settlement rule — if MLB declares an official result, that result governs settlement for all markets regardless of the number of innings played. For all markets — Winner, Spread, and Totals — settlement is based on the official result declared by MLB regardless of how many innings were completed. If MLB declares an official result at any point, that result governs settlement for all markets including Spread and Totals. The official score at the time of the MLB ruling governs all market settlement. For example, if a game is called due to weather and MLB awards an official result with a score of 1-0, the team leading 1-0 wins the Winner market, the +1.5 on the spread market side would resolve to $1.00, and the score of 1-0 governs the Totals market. If a game does not reach the minimum threshold required by MLB to be declared an official game and is not resumed before the Contract’s expiration date, all markets settle at last fair market prices. If the game is resumed before the Contract’s expiration date, the official MLB result governs settlement for all markets. If the game is resumed after the Contract’s expiration date, all markets settle at last fair market prices. Polymarket US has the discretion to create a new market for any game resumed on a later date. In the event MLB schedules games with a non-standard format such as seven-inning doubleheaders, the official game threshold for those games is determined by MLB’s rules for that format. All markets follow the same universal settlement rule — if MLB declares an official result, that result governs settlement for all markets regardless of the number of innings played.What if a game is called early due to weather?
If the governing body (MLB) declares an official result, that result governs. This is treated as a shortened/truncated game. All settlements are based on official league rules.What happens if a game is postponed?
If a game is postponed before the first pitch for any reason, the following applies:- If the game is rescheduled and played before the Contract’s expiration date (typically two weeks from the original game date), the official MLB result will govern settlement.
- If the game is rescheduled to a date beyond the Contract’s expiration date, all Contracts on the original game will settle at last fair market prices.