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 for 40 cents each. The underlying event has concluded. What happens next? Grasping how prediction markets resolve matters significantly — the settlement mechanism dictates whether you receive your winnings and on what timeline. Below is a comprehensive breakdown of the mechanics.
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
Every Polymarket contract identifies its resolution source in advance. Typical sources encompass:
- 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
Settlement does not always proceed without friction. Frequent complications arise from:
- 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 through granular resolution criteria embedded in each contract's specification. Always examine the detailed terms 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 investing — unclear language heightens settlement uncertainty
- Track the UMA dispute dashboard to stay informed about contested contracts
- Incorporate settlement delays into your yield projections (a 10% gain over 6 months is ~20% annualised)
Engage with PolyGram to access markets featuring transparent resolution criteria. Start trading on PolyGram →