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 shares at 40 cents. The event has concluded. What happens next? Grasping how prediction markets resolve matters greatly — because the settlement mechanism determines if and when your winnings arrive. Here's the complete breakdown.
The resolution process on Polymarket
Polymarket employs the UMA (Universal Market Access) Oracle for decentralised resolution:
- Event occurs: The real-world event reaches completion (election results are certified, match concludes, information becomes available)
- Proposal: A "proposer" files the outcome with the UMA Oracle, putting up collateral (in UMA tokens)
- Challenge window: A 2-hour span during which anyone can object to the proposed outcome by submitting their own collateral
- If undisputed: The proposed outcome becomes binding. Winning shares pay $1.00; losing shares pay $0.00
- If disputed: UMA token holders decide on the correct outcome. This process spans 24-48 hours
- Payout: USDC is automatically transferred to winning share holders
Resolution sources
Each Polymarket market identifies its resolution source in advance. Typical sources comprise:
- Official government data: Election outcomes from state secretaries, BLS labour statistics
- News wire services: AP, Reuters for event outcomes and breaking developments
- Price feeds: CoinGecko, CoinMarketCap for cryptocurrency price thresholds
- Sports authorities: FIFA, UEFA, NFL for sporting outcomes
- Scientific publications: Peer-reviewed studies or official agency statements for research-based markets
Edge cases and ambiguity
Straightforward settlement doesn't always occur. Typical issues involve:
- Ambiguous wording: "Will X happen by 2026?" — is that by 1 January or 31 December?
- Event cancellation: What if a planned event gets delayed with no definite restart date?
- Partial outcomes: A bill clears the House yet fails in the Senate — how does "Will Congress pass X?" conclude?
Polymarket mitigates these through comprehensive resolution guidelines published in each market's description. Always examine the specifics 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 criteria before purchasing — unclear criteria elevate settlement uncertainty
- Track the UMA dispute dashboard for markets under challenge
- Include settlement timing in your profit analysis (a 10% gain over 6 months equals roughly 20% on an annual basis)
Trade markets with unambiguous resolution criteria on PolyGram. Start trading on PolyGram →