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 acquired YES shares for 40 cents. The underlying event has concluded. What happens next? Grasping how prediction markets resolve matters significantly — the settlement mechanism dictates whether you receive your winnings and on what timeline. Here's your complete guide.
The resolution process on Polymarket
Polymarket employs the UMA (Universal Market Access) Oracle for decentralised settlement:
- Event occurs: The real-world event reaches completion (election outcomes are formalised, sporting contests conclude, relevant information becomes public)
- Proposal: A "proposer" lodges the outcome with the UMA Oracle, posting collateral (denominated in UMA tokens)
- Challenge window: A 2-hour interval during which anyone may contest the proposed outcome by depositing a matching bond
- If undisputed: The submitted outcome is locked in. Winning shares yield $1.00; losing shares yield $0.00
- If disputed: UMA token holders determine the accurate outcome through voting. Resolution takes 24-48 hours
- Payout: USDC transfers immediately 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, labour statistics from the BLS
- News wire services: Reuters, AP for event-driven outcomes
- Price feeds: CoinMarketCap, CoinGecko for cryptocurrency price thresholds
- Sports authorities: NFL, UEFA, FIFA for sporting results
- Scientific publications: Institutional announcements or peer-reviewed research for science-based markets
Edge cases and ambiguity
Certain markets do not settle without complications. Frequent sources of dispute include:
- Ambiguous wording: "Will X happen by 2026?" — interpreted as by 1 January or 31 December?
- Event cancellation: What occurs if a planned event is postponed with no rescheduled date?
- Partial outcomes: Legislation clears one chamber but fails in another — how does "Will Congress pass X?" conclude?
Polymarket mitigates these through comprehensive resolution criteria detailed in each market's specifications. Examine the terms thoroughly before committing capital.
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 terms prior to purchasing — unclear criteria elevate settlement uncertainty
- Track the UMA dispute dashboard to identify contested settlements
- Account for settlement delays when projecting returns (a 10% profit realised over 6 months equates to roughly 20% annually)
Trade markets featuring transparent settlement criteria on PolyGram. Start trading on PolyGram →