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 outcome materialised. What happens next? Grasping how prediction markets resolve matters fundamentally — because the settlement mechanism determines if and when your winnings arrive. Below is your complete guide.
The resolution process on Polymarket
Polymarket employs the UMA (Universal Market Access) Oracle for decentralised settlement:
- Event occurs: The underlying event concludes (election outcomes are certified, match concludes, information becomes public)
- Proposal: A "proposer" lodges the result with the UMA Oracle, posting collateral (denominated in UMA tokens)
- Challenge window: A 2-hour interval during which any participant may contest the submitted result by depositing a matching bond
- If undisputed: The submitted result stands as binding. Successful contracts pay $1.00; unsuccessful contracts pay $0.00
- If disputed: UMA token holders adjudicate the true result. Resolution takes 24-48 hours
- Payout: USDC transfers automatically to holders of winning contracts
Resolution sources
Each Polymarket contract identifies its resolution source in advance. Typical sources comprise:
- Official government data: Electoral outcomes from secretaries of state, labour statistics from the BLS
- News wire services: AP, Reuters for event conclusions and announcements
- Price feeds: CoinGecko, CoinMarketCap for cryptocurrency price thresholds
- Sports authorities: FIFA, UEFA, NFL for sporting results
- Scientific publications: Peer-reviewed research or official agency statements for scientific markets
Edge cases and ambiguity
Certain markets do not settle straightforwardly. Frequent complications involve:
- Ambiguous wording: "Will X occur by 2026?" — does completion by January 1 or December 31 count?
- 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 the other — what does "Will Congress approve X?" mean?
Polymarket mitigates these through comprehensive settlement guidelines embedded in every contract description. Always examine the specific terms before transacting.
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 settlement specifications before committing capital — unclear language raises counterparty and timing risk
- Track the UMA dispute dashboard for markets facing challenges
- Incorporate settlement delays into profit projections (a 10% gain over 6 months translates to roughly 20% on an annualised basis)
Trade contracts with transparent settlement rules on PolyGram. Start trading on PolyGram →