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 picked up YES shares at 40 cents. The event transpired. What happens next? Grasping how prediction markets resolve matters enormously — since the settlement mechanism dictates if and when your winnings arrive. Here's the complete breakdown.
The resolution process on Polymarket
Polymarket relies on the UMA (Universal Market Access) Oracle for decentralised settlement:
- Event occurs: The real-world event concludes (election outcomes confirmed, match ends, information released)
- Proposal: A "proposer" files the result with the UMA Oracle, posting collateral (denominated in UMA tokens)
- Challenge window: A 2-hour span during which anyone can contest the submitted result by placing their own collateral
- If undisputed: The submitted result stands as binding. Winning shares receive $1.00; losing shares receive $0.00
- If disputed: UMA token holders adjudicate the correct result. Resolution takes 24-48 hours
- Payout: USDC transfers automatically to holders of winning shares
Resolution sources
Each Polymarket market declares its resolution source beforehand. Typical sources comprise:
- Official government data: Electoral outcomes from state secretaries, BLS economic statistics
- News wire services: AP, Reuters for event-driven outcomes
- Price feeds: CoinGecko, CoinMarketCap for cryptocurrency price thresholds
- Sports authorities: FIFA, UEFA, NFL for sporting results
- Scientific publications: Peer-reviewed studies or regulatory announcements for science-related markets
Edge cases and ambiguity
Certain markets don't settle straightforwardly. Typical complications involve:
- Ambiguous wording: "Will X happen by 2026?" — does this mean by Jan 1 or Dec 31?
- Event cancellation: What occurs if a planned event gets postponed with no fixed date?
- Partial outcomes: A bill advances through the House yet stalls in the Senate — how does "Will Congress pass X?" conclude?
Polymarket mitigates these issues through exhaustive resolution specifications in each market's particulars. Always examine the detailed terms 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 the resolution criteria upfront — unclear criteria elevate settlement uncertainty
- Keep watch on the UMA dispute dashboard for contested positions
- Incorporate settlement duration into your profit projections (a 10% return over 6 months equals roughly 20% on an annualised basis)
Trade markets featuring transparent resolution criteria on PolyGram. Start trading on PolyGram →