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 acquired YES shares for 40 cents. The underlying event has concluded. What happens next? 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 guide.
The resolution process on Polymarket
Polymarket relies on the UMA (Universal Market Access) Oracle for decentralised settlement:
- Event occurs: The real-world event reaches its conclusion (election results certified, game finishes, data published)
- Proposal: A "proposer" submits the outcome to the UMA Oracle, staking a bond (in UMA tokens)
- Challenge window: A 2-hour period where anyone can dispute the proposed outcome by posting a counter-bond
- If undisputed: The proposed outcome becomes final. Winning shares pay $1.00; losing shares pay $0.00
- If disputed: UMA token holders vote on the correct outcome. This takes 24-48 hours
- Payout: USDC is automatically distributed to winning share holders
Resolution sources
Each Polymarket market specifies its resolution source upfront. Common sources include:
- Official government data: Election results from state secretaries, BLS economic reports
- News wire services: AP, Reuters for breaking news outcomes
- Price feeds: CoinGecko, CoinMarketCap for crypto price milestones
- Sports authorities: FIFA, UEFA, NFL for sports outcomes
- Scientific publications: Peer-reviewed papers or agency announcements for science markets
Edge cases and ambiguity
Not every market resolves cleanly. Common complications include:
- Ambiguous wording: "Will X happen by 2026?" — does that mean by Jan 1 or Dec 31?
- Event cancellation: What happens if a scheduled event is postponed indefinitely?
- Partial outcomes: A bill passes the House but not the Senate — how does "Will Congress pass X?" resolve?
Polymarket addresses these with detailed resolution criteria in each market's description. Always read the fine print before 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
- Review settlement criteria prior to placing trades — unclear criteria heighten settlement uncertainty
- Keep tabs on the UMA dispute dashboard for contested outcomes
- Account for payout timing when assessing returns (a 10% gain over 6 months is ~20% annualised)
Trade markets with clear resolution criteria on PolyGram. Start trading on PolyGram →