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 contracts at 40 cents. The underlying event concludes. What happens next? Grasping how prediction markets resolve matters enormously — because the settlement mechanism determines if and when your winnings arrive. Here is 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 reaches completion (election outcomes are official, sporting event concludes, data 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 challenge the proposed outcome by submitting their own counter-bond
- If undisputed: The proposed outcome becomes binding. Winning contracts pay $1.00; losing contracts pay $0.00
- If disputed: UMA token holders cast votes to determine the correct outcome. This process spans 24-48 hours
- Payout: USDC transfers automatically to holders of winning contracts
Resolution sources
Each Polymarket contract identifies its resolution source in advance. Typical sources comprise:
- Official government data: Election certifications from secretaries of state, labour statistics from the BLS
- News wire services: Reuters, AP for event-driven outcomes
- Price feeds: CoinMarketCap, CoinGecko for digital asset price thresholds
- Sports authorities: NFL, UEFA, FIFA for athletic competition results
- Scientific publications: Peer-reviewed journals or regulatory agency statements for research-based markets
Edge cases and ambiguity
Certain markets do not resolve straightforwardly. Frequent complications arise from:
- Ambiguous wording: "Will X occur before 2026?" — does that mean before 1 January or 31 December?
- Event cancellation: What if a scheduled event gets postponed with no rescheduled date?
- Partial outcomes: A proposal advances through one legislative chamber but fails in another — how does "Will Congress approve X?" settle?
Polymarket mitigates these through explicit resolution terms within each market's specification. Always examine the terms thoroughly 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 the resolution terms before committing capital — unclear specifications elevate settlement uncertainty
- Check the UMA dispute dashboard to track markets under contention
- Include settlement delays in your profit projections (a 10% return across 6 months translates to roughly 20% on an annualised basis)
Trade markets featuring transparent resolution criteria on PolyGram. Start trading on PolyGram →