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 event has concluded. What happens next? Grasping how prediction markets resolve matters enormously — since the settlement mechanism dictates if and when your winnings arrive. Below is a comprehensive guide to the essentials.
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 are confirmed, sporting fixture ends, 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 anyone may contest the submitted outcome by depositing a matching 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 true outcome. This process spans 24-48 hours
- Payout: USDC gets transferred automatically to holders of winning shares
Resolution sources
Each Polymarket market identifies its resolution source in advance. Typical sources comprise:
- Official government data: Electoral outcomes from state secretaries, BLS labour statistics
- News wire services: AP, Reuters for event-driven outcome announcements
- Price feeds: CoinGecko, CoinMarketCap for cryptocurrency valuation thresholds
- Sports authorities: FIFA, UEFA, NFL for athletic competition results
- Scientific publications: Peer-reviewed studies or regulatory agency statements for research-focused markets
Edge cases and ambiguity
Certain markets do not settle without complications. Frequent problem areas involve:
- Ambiguous wording: "Will X happen by 2026?" — does this refer to 1 January or 31 December?
- Event cancellation: What occurs if a planned event gets postponed with no rescheduled date?
- Partial outcomes: A proposal clears the lower chamber yet fails in the upper chamber — how does "Will Congress pass X?" conclude?
Polymarket mitigates these through explicit resolution guidelines embedded in each market's description. Always examine the terms thoroughly before placing a trade.
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 before investing — unclear criteria raise settlement uncertainty
- Keep watch on the UMA dispute dashboard for markets under challenge
- Include settlement duration in your profit projections (a 10% return over 6 months equals roughly 20% on an annualised basis)
Trade markets with clear resolution criteria on PolyGram. Start trading on PolyGram →