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 concluded. What happens next? Grasping how prediction markets resolve matters enormously — because the settlement mechanism dictates whether you receive your winnings and on what timeline. Here's the complete breakdown.
The resolution process on Polymarket
Polymarket employs the UMA (Universal Market Access) Oracle for decentralised settlement:
- Event occurs: The real-world event reaches finality (election outcomes announced, match concludes, official figures released)
- Proposal: A "proposer" submits the final outcome to the UMA Oracle, posting collateral (denominated in UMA tokens)
- Challenge window: A 2-hour period during which anyone may contest the proposed outcome by posting counter-collateral
- If undisputed: The proposed outcome becomes binding. Winning contracts pay $1.00; losing contracts pay $0.00
- If disputed: UMA token holders adjudicate the correct outcome. Resolution takes 24-48 hours
- Payout: USDC transfers automatically to holders of winning contracts
Resolution sources
Each Polymarket contract specifies its resolution source in advance. Typical sources comprise:
- Official government data: Electoral outcomes from state offices, Bureau of Labor Statistics economic releases
- News wire services: Associated Press, Reuters for event conclusions
- Price feeds: CoinGecko, CoinMarketCap for digital asset price thresholds
- Sports authorities: FIFA, UEFA, NFL for sporting event results
- Scientific publications: Peer-reviewed journals or official agency statements for research-based markets
Edge cases and ambiguity
Certain markets do not resolve straightforwardly. Frequent complications arise from:
- Ambiguous wording: "Will X occur before 2026?" — interpreted as before January 1st or December 31st?
- Event cancellation: What transpires if a planned event gets postponed indefinitely?
- Partial outcomes: A legislative proposal advances through one chamber but fails in another — how does "Will Congress approve X?" conclude?
Polymarket mitigates these scenarios through comprehensive resolution criteria embedded in each contract's specification. Always examine the detailed terms before participating in live sports markets or any other contract type.
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 thoroughly before trading — unclear specifications heighten settlement uncertainty
- Check the UMA dispute dashboard regularly for contested outcomes
- Account for settlement duration when projecting returns (a 10% profit over 6 months equals roughly 20% annualised)
Trade contracts featuring transparent resolution criteria on PolyGram. Start trading on PolyGram →