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 shares at 40 cents. The event has concluded. What happens next? Grasping how prediction markets resolve matters enormously — because the settlement mechanism dictates whether and when your winnings arrive. Here's the complete breakdown.
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 certified, sporting contest finishes, information becomes available)
- 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 challenge the submitted outcome by placing a counter-bond
- If undisputed: The submitted outcome becomes binding. Winning shares pay $1.00; losing shares pay $0.00
- If disputed: UMA token holders cast votes to determine the correct outcome. This process spans 24-48 hours
- Payout: USDC is automatically transferred 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: AP, Reuters for event-driven outcomes
- Price feeds: CoinGecko, CoinMarketCap for cryptocurrency price thresholds
- Sports authorities: FIFA, UEFA, NFL for sporting results
- Scientific publications: Peer-reviewed journals or regulatory announcements for science-based markets
Edge cases and ambiguity
Settlement doesn't always proceed without friction. Frequent complications arise from:
- Ambiguous wording: "Will X happen by 2026?" — does the deadline mean 1 January or 31 December?
- Event cancellation: What transpires if a scheduled event gets postponed with no rescheduled date?
- Partial outcomes: A bill advances through the House yet fails in the Senate — how should "Will Congress pass X?" be resolved?
Polymarket mitigates these risks through granular resolution criteria embedded in each market's description. Always examine the detailed terms before 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 resolution criteria before purchasing — unclear criteria introduce settlement uncertainty
- Track the UMA dispute dashboard for markets facing challenges
- Incorporate settlement delays into your profit projections (a 10% return over 6 months equals roughly 20% on an annualised basis)
Trade markets featuring transparent resolution criteria on PolyGram. Start trading on PolyGram →