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 shares for 40 cents. The underlying event has 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. Below is a comprehensive overview.
The resolution process on Polymarket
Polymarket relies on the UMA (Universal Market Access) Oracle for decentralised settlement:
- Event occurs: The actual event reaches completion (election outcomes are official, match concludes, information becomes public)
- Proposal: A "proposer" files the outcome with the UMA Oracle, putting up a bond denominated in UMA tokens
- Challenge window: A 2-hour interval during which any participant may contest the submitted outcome by depositing a counter-bond
- If undisputed: The submitted outcome becomes binding. Winning shares are worth $1.00; losing shares are worth $0.00
- If disputed: UMA token holders cast votes to determine the accurate outcome. Resolution takes 24-48 hours
- Payout: USDC transfers instantly to holders of winning shares
Resolution sources
Each Polymarket market identifies its resolution source in advance. Typical sources encompass:
- Official government data: Electoral outcomes from state secretaries, Labour Department economic statistics
- News wire services: Associated Press, Reuters for event conclusions
- Price feeds: CoinGecko, CoinMarketCap for digital asset price targets
- Sports authorities: FIFA, UEFA, NFL for athletic competition results
- Scientific publications: Academic journals or regulatory body announcements for research-based markets
Edge cases and ambiguity
Straightforward settlement does not always occur. Frequent complications arise from:
- Ambiguous wording: "Will X happen by 2026?" — is the deadline January 1 or December 31?
- Event cancellation: What occurs if a planned event gets delayed with no rescheduled date?
- Partial outcomes: A proposal advances through one chamber but fails in another — how should "Will Congress pass X?" be determined?
Polymarket mitigates these through explicit resolution instructions embedded in market descriptions. Always examine the specific terms prior to 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 settlement instructions before investing — unclear language raises settlement uncertainty
- Check the UMA dispute dashboard regularly for markets under contest
- Include settlement duration when computing returns (a 10% profit over 6 months equals roughly 20% on an annualised basis)
Engage with markets featuring unambiguous settlement criteria on PolyGram. Start trading on PolyGram →