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 0.40. The event concludes. What happens next? Grasping how prediction markets resolve matters enormously — because the settlement mechanism dictates whether and when your winnings arrive. Here is the complete breakdown.
The resolution process on Polymarket
Polymarket employs the UMA (Universal Market Access) Oracle for decentralised settlement:
- Event occurs: The real-world occurrence reaches completion (election tallies confirmed, match concludes, information released)
- Proposal: A "proposer" files the result with the UMA Oracle, committing a bond (denominated in UMA tokens)
- Challenge window: A 2-hour interval during which anyone may contest the filed result by depositing a counter-bond
- If undisputed: The filed result becomes binding. Winning contracts pay $1.00; losing contracts pay $0.00
- If disputed: UMA token holders cast votes determining the true result. This requires 24-48 hours
- Payout: USDC transfers automatically to holders of winning contracts
Resolution sources
Every Polymarket contract identifies its resolution source in advance. Typical sources comprise:
- Official government data: Electoral tallies from state secretaries, BLS labour statistics
- News wire services: AP, Reuters for event conclusions
- Price feeds: CoinGecko, CoinMarketCap for digital asset price thresholds
- Sports authorities: FIFA, UEFA, NFL for athletic outcomes
- Scientific publications: Peer-reviewed research or government agency statements for scientific markets
Edge cases and ambiguity
Certain contracts do not settle straightforwardly. Frequent obstacles involve:
- Ambiguous wording: "Will X occur by 2026?" — does that mean before Jan 1 or through Dec 31?
- Event cancellation: What if a planned event gets delayed with no rescheduling date?
- Partial outcomes: A proposal advances through one chamber yet stalls in another — how does "Will Congress enact X?" conclude?
Polymarket mitigates these through comprehensive settlement language in each contract's specifications. Always examine the terms thoroughly before participating.
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 language before trading — unclear criteria raise settlement uncertainty
- Check the UMA dispute dashboard for contested contracts
- Account for settlement delays when computing returns (a 10% gain across 6 months equals roughly 20% yearly)
Trade outcome markets featuring transparent settlement language on PolyGram. Start trading on PolyGram →