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 per share. The underlying event concludes. Then what happens? Grasping how prediction markets resolve matters enormously — because the settlement mechanism dictates whether you receive your winnings and on what timeline. Here's your complete breakdown.
The resolution process on Polymarket
Polymarket relies on the UMA (Universal Market Access) Oracle for decentralised outcome determination:
- Event occurs: The actual event reaches completion (electoral bodies certify winners, sporting contests finish, relevant information becomes public)
- Proposal: A "proposer" forwards the result to the UMA Oracle, committing a bond denominated in UMA tokens
- Challenge window: A 2-hour interval during which any participant may contest the submitted result by depositing an opposing bond
- If undisputed: The submitted result stands as binding. Correct shares receive $1.00; incorrect shares receive $0.00
- If disputed: UMA token holders determine which outcome is accurate. This determination spans 24-48 hours
- Payout: USDC transfers instantly to holders of winning shares
Resolution sources
Every Polymarket market declares its resolution source in advance. Typical sources comprise:
- Official government data: Electoral outcomes from state authorities, labour statistics from the BLS
- News wire services: Reuters, AP for event conclusions and announcements
- Price feeds: CoinMarketCap, CoinGecko for digital asset price thresholds
- Sports authorities: UEFA, FIFA, NFL for competitive sport results
- Scientific publications: Academic journals or governmental agency releases for research-based markets
Edge cases and ambiguity
Certain markets do not settle straightforwardly. Frequent complications involve:
- Ambiguous wording: "Will X occur before 2026?" — does this mean before 1 January or through 31 December?
- Event cancellation: What transpires if a planned event gets postponed with no rescheduling date?
- Partial outcomes: A measure advances through one chamber but fails in another — how should "Will the legislature approve X?" conclude?
Polymarket mitigates these issues by providing exhaustive resolution specifications within each market's description page. Always examine the detailed terms before commencing 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
- Study the resolution criteria prior to purchasing — unclear specifications introduce settlement uncertainty
- Track the UMA dispute dashboard to identify markets facing challenges
- Incorporate settlement duration into 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 →