Key takeaway: Prediction markets conclude when an appointed oracle or authoritative source validates the final outcome. Polymarket employs the UMA Oracle for settlement via a propose-dispute framework designed to mitigate the risk of manipulation. The majority of markets finalise within hours following the event's conclusion.
You acquired YES shares for 40 cents. The event transpired. What happens next? Grasping prediction market resolution mechanics matters significantly — because the settlement framework dictates whether and how quickly your winnings are distributed. Below is a comprehensive overview.
The resolution process on Polymarket
Polymarket leverages the UMA (Universal Market Access) Oracle for decentralised settlement:
- Event concludes: The underlying event reaches completion (electoral outcomes are officially confirmed, sporting contests finish, relevant information becomes public)
- Submission: A "proposer" presents the outcome to the UMA Oracle, pledging collateral (denominated in UMA tokens)
- Dispute window: A 2-hour interval during which any participant may contest the submitted outcome by depositing their own collateral
- If uncontested: The submitted outcome becomes binding. Successful shares receive $1.00; unsuccessful shares receive $0.00
- If contested: UMA token holders participate in a vote to determine the accurate outcome. Resolution typically requires 24-48 hours
- Distribution: USDC funds are transferred directly to holders of winning shares
Resolution sources
Each Polymarket contract identifies its resolution source in advance. Typical sources encompass:
- Public government sources: Electoral data from state administrative offices, labour statistics from the BLS
- Major news organisations: AP, Reuters for event-driven outcomes
- Market data providers: CoinGecko, CoinMarketCap for cryptocurrency price thresholds
- Sporting bodies: FIFA, UEFA, NFL for athletic competition results
- Academic sources: Peer-reviewed research or official government announcements for scientific markets
Edge cases and ambiguity
Settlement does not always proceed without complications. Frequent sources of difficulty include:
- Unclear language: "Will X occur before 2026?" — interpreted as before January 1 or December 31?
- Postponement or cancellation: What occurs if an anticipated event is delayed indefinitely?
- Incomplete resolutions: A proposal passes one chamber but fails in another — how does "Will Congress approve X?" conclude?
Polymarket mitigates these risks through explicit resolution instructions embedded within each market's specification. Always examine the detailed terms prior to participating in trading.
How other platforms resolve
| Platform | Resolution method | Dispute mechanism |
| Polymarket | UMA Oracle (decentralised) | Token holder vote |
| Kalshi | Internal resolution team | CFTC-regulated appeal |
| Betfair | Betfair rules committee | Customer service appeal |
| Augur | REP token oracle | Escalating bonds + fork |
Tips for resolution-aware trading
- Examine resolution criteria thoroughly before committing capital — unclear specifications heighten settlement uncertainty
- Track the UMA dispute dashboard to identify markets facing challenges
- Account for settlement duration when projecting returns (a 10% profit realised over 6 months translates to roughly 20% on an annualised basis)
Participate in markets featuring transparent resolution standards on PolyGram. Start trading on PolyGram →