In this guide
Key takeaway: Prediction markets conclude when an authorised oracle or data source validates the final outcome. Polymarket relies on the UMA Oracle for settlement via a propose-dispute framework designed to mitigate fraud. The majority of markets finalise within hours following the event's conclusion.
You acquired YES shares for $0.40 per unit. The event has now transpired. What happens next? Grasping how prediction markets resolve matters fundamentally — because the settlement mechanism dictates whether you receive your winnings and on what timeline. Here is a comprehensive overview.
The resolution process on Polymarket
Polymarket employs the UMA (Universal Market Access) Oracle as its decentralised settlement infrastructure:
- Event occurs: The underlying real-world event concludes (official election certification, sporting event completion, regulatory data release)
- Proposal: A designated "proposer" lodges the outcome with the UMA Oracle, posting collateral denominated in UMA tokens
- Challenge window: A 2-hour interval during which any participant may contest the submitted outcome by depositing an opposing bond
- If undisputed: The submitted outcome becomes binding. Holders of winning shares receive $1.00; holders of losing shares receive $0.00
- If disputed: UMA token holders cast votes determining the accurate outcome. Resolution takes 24-48 hours
- Payout: USDC funds transfer automatically to all winning share holders
Resolution sources
Each Polymarket contract identifies its resolution source in advance. Typical sources comprise:
- Official government data: Electoral outcomes from state officials, labour statistics from the BLS
- News wire services: Reuters, AP for event conclusions and announcements
- Price feeds: CoinMarketCap, CoinGecko for cryptocurrency valuation thresholds
- Sports authorities: NFL, UEFA, FIFA for competitive outcomes
- Scientific publications: Agency announcements or peer-reviewed research for scientific markets
Edge cases and ambiguity
Certain markets do not resolve with straightforward clarity. Frequent sources of complication include:
- Ambiguous wording: "Will X occur before 2026?" — interpretation varies between January 1st and December 31st
- Event cancellation: If a planned event gets postponed with no rescheduled date, how does the market conclude?
- Partial outcomes: Legislation advances through one chamber but stalls in another — what does "Will Congress enact X?" signify?
Polymarket mitigates these risks by publishing exhaustive resolution criteria within each market's specification sheet. Always examine the terms thoroughly before placing any trade.
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 introduce settlement uncertainty
- Check the UMA dispute dashboard regularly for markets facing challenges
- Account for settlement delays when computing returns (a 10% profit realised over 6 months equals roughly 20% on an annualised basis)
Trade markets with clear resolution criteria on PolyGram. Start trading on PolyGram →