In this guide
Key takeaway: Prediction markets resolve when a designated oracle or resolution source confirms the outcome. On Polymarket, the UMA Oracle handles settlement with a propose-dispute mechanism that prevents manipulation. Most markets settle within hours of the event outcome.
You purchased YES contracts at $0.40. The underlying event concludes. What happens next? Grasping how prediction markets resolve matters enormously — the settlement mechanism dictates whether you receive your winnings and on what timeline. Here's what you should understand.
The resolution process on Polymarket
Polymarket relies on the UMA (Universal Market Access) Oracle for decentralised settlement:
- Event occurs: The real-world outcome finalises (election officials announce results, sporting event concludes, official data becomes available)
- Proposal: A "proposer" submits the final outcome to the UMA Oracle, committing a bond denominated in UMA tokens
- Challenge window: A 2-hour interval during which any participant can challenge the submitted outcome by posting their own bond
- If undisputed: The submitted outcome becomes binding. Correct share holders receive $1.00 per share; incorrect share holders receive $0.00
- If disputed: UMA token holders cast votes to determine the accurate outcome. This voting period spans 24-48 hours
- Payout: USDC transfers automatically to holders of winning shares
Resolution sources
Each Polymarket contract identifies its resolution source at inception. Typical sources comprise:
- Official government data: State election authorities, Bureau of Labour Statistics publications for economic indicators
- News wire services: Reuters, AP for event outcomes and breaking developments
- Price feeds: CoinMarketCap, CoinGecko for cryptocurrency price thresholds
- Sports authorities: UEFA, NFL, FIFA for competitive sport results
- Scientific publications: Peer-reviewed research or official agency statements for scientific markets
Edge cases and ambiguity
Certain markets do not resolve straightforwardly. Typical complications involve:
- Ambiguous wording: "Will X occur before 2026?" — interpretation may differ on whether this means 1 January or 31 December
- Event cancellation: How does settlement proceed if a scheduled event gets postponed with no rescheduled date?
- Partial outcomes: A legislative proposal advances through one chamber but fails in another — what does "Will Congress approve X?" mean?
Polymarket mitigates these scenarios by publishing comprehensive resolution criteria within each market's terms. Always examine the resolution language thoroughly before placing trades.
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 before committing capital — unclear language elevates settlement uncertainty
- Track the UMA dispute dashboard to monitor contested outcomes
- Incorporate settlement duration into return projections (a 10% profit realised over 6 months approximates 20% annualised)
Trade contracts with transparent resolution criteria on PolyGram. Start trading on PolyGram →