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 underlying event has concluded. What happens next? Grasping how prediction markets resolve matters enormously — because the settlement mechanism dictates whether funds reach your account and on what timeline. This guide covers everything essential to know.
The resolution process on Polymarket
Polymarket employs the UMA (Universal Market Access) Oracle for decentralised resolution:
- 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 mitigates these risks through granular resolution criteria documented in each market's description. Always examine the terms thoroughly before committing capital.
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 trading — unclear language heightens settlement uncertainty
- Monitor the UMA dispute dashboard for contested markets
- Incorporate settlement delays into your performance projections (a 10% gain over 6 months is ~20% annualised)
Trade markets with transparent resolution criteria on PolyGram. Start trading on PolyGram →