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 acquired YES contracts at $0.40 per share. The underlying event has concluded. What happens next? Grasping how prediction markets resolve is essential — because the settlement mechanism determines if and when your winnings arrive. Here's your complete guide.
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 officially declared, sporting match ends, information becomes public)
- Proposal: A "proposer" submits what actually happened to the UMA Oracle, putting down a bond denominated in UMA tokens
- Challenge window: A 2-hour window during which any participant may contest the submitted outcome by depositing their own counter-bond
- If undisputed: The submitted outcome stands as final. Winning contracts pay $1.00; losing contracts pay $0.00
- If disputed: UMA token holders cast votes to determine the true outcome. Resolution takes 24-48 hours
- Payout: USDC gets sent automatically to those holding winning shares
Resolution sources
Each Polymarket contract identifies its resolution source in advance. Typical sources comprise:
- Official government data: Electoral outcomes from secretaries of state, Labour Department economic releases
- News wire services: Reuters, AP for event conclusions in the news cycle
- Price feeds: CoinMarketCap, CoinGecko for cryptocurrency price targets
- Sports authorities: NFL, UEFA, FIFA for athletic competition results
- Scientific publications: Peer-reviewed journals or official agency statements for research-based markets
Edge cases and ambiguity
Certain markets don't resolve straightforwardly. Frequent complications arise from:
- Ambiguous wording: "Will X happen by 2026?" — interpreted as by Jan 1 or Dec 31?
- Event cancellation: What if a planned event gets postponed with no rescheduled date?
- Partial outcomes: A proposal clears one chamber but fails in another — how does "Will Congress pass X?" conclude?
Polymarket mitigates these through explicit resolution language in each contract's specification. Always examine the detailed terms before entering a position.
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 resolution language before committing capital — unclear definitions create settlement uncertainty
- Check the UMA dispute tracker for markets facing challenges
- Account for settlement delays when computing returns (a 10% gain realised over 6 months translates to roughly 20% on an annualised basis)
Trade contracts with transparent resolution criteria on PolyGram. Start trading on PolyGram →