In this guide
Key takeaway: Prediction markets conclude when an authorised oracle or data source validates the final outcome. Polymarket employs the UMA Oracle for settlement via a propose-dispute framework designed to mitigate gaming and fraud. The majority of markets finalise within hours following event confirmation.
You acquired YES shares for $0.40 each. The underlying event has concluded. What happens next? Grasping how prediction markets resolve matters fundamentally — since the settlement mechanism dictates whether funds reach your account and on what timeline. Below is a comprehensive overview.
The resolution process on Polymarket
Polymarket leverages the UMA (Universal Market Access) Oracle for decentralised outcome confirmation:
- Event occurs: The actual event concludes (electoral outcomes are officially declared, sporting contests finish, relevant information becomes public)
- Proposal: A "proposer" files the outcome with the UMA Oracle, posting a bond denominated in UMA tokens as collateral
- Challenge window: A 2-hour interval during which any participant may contest the submitted outcome by depositing their own counter-bond
- If undisputed: The submitted outcome becomes binding. Correct shares yield $1.00; incorrect shares yield $0.00
- If disputed: UMA token holders adjudicate the true outcome. Resolution takes 24-48 hours
- Payout: USDC funds transfer instantly to holders of winning shares
Resolution sources
Each Polymarket contract designates its authoritative resolution source in advance. Typical sources encompass:
- Official government data: Electoral certifications from state officials, labour statistics from the BLS
- News wire services: AP, Reuters for event-based outcomes
- Price feeds: CoinGecko, CoinMarketCap for digital asset price thresholds
- Sports authorities: FIFA, UEFA, NFL for athletic competition results
- Scientific publications: Peer-reviewed studies or official agency releases for research-based markets
Edge cases and ambiguity
Certain markets do not resolve straightforwardly. Frequent sources of dispute include:
- Ambiguous wording: "Will X occur by 2026?" — interpreted as by 1 January or 31 December?
- Event cancellation: If a scheduled occurrence is delayed indefinitely, what is the settlement outcome?
- Partial outcomes: Legislation advances through one chamber but fails in another — how does "Will Congress enact X?" settle?
Polymarket mitigates these through explicit resolution language embedded in market specifications. Always examine the complete terms prior to trading.
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 committing capital — unclear terms introduce counterparty and timing risk
- Track the UMA dispute dashboard for markets under contestation
- Incorporate settlement delays into performance evaluation (a 10% return across 6 months translates to roughly 20% on an annualised basis)
Trade markets with transparent settlement language on PolyGram. Start trading on PolyGram →