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 for 40 cents. The event has concluded. What happens next? Grasping how prediction markets resolve matters greatly — because the settlement mechanism establishes if and when your winnings arrive. Here's what you should understand.
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 announced, match concludes, information released)
- Proposal: A "proposer" files the outcome with the UMA Oracle, posting collateral (denominated in UMA tokens)
- Challenge window: A 2-hour interval during which any participant may contest the submitted outcome by depositing a counter-collateral
- If undisputed: The submitted outcome becomes binding. Winning shares receive $1.00; losing shares receive $0.00
- If disputed: UMA token holders adjudicate the correct outcome. Resolution takes 24-48 hours
- Payout: USDC transfers automatically to holders of winning shares
Resolution sources
Each Polymarket market designates its resolution source in advance. Typical sources encompass:
- Official government data: Election declarations from state secretaries, BLS economic figures
- News wire services: AP, Reuters for event outcomes and breaking developments
- Price feeds: CoinGecko, CoinMarketCap for digital asset price thresholds
- Sports authorities: FIFA, UEFA, NFL for athletic competition results
- Scientific publications: Peer-reviewed studies or regulatory announcements for research-based markets
Edge cases and ambiguity
Not all markets conclude without friction. Frequent complications arise from:
- Ambiguous wording: "Will X happen by 2026?" — does that refer to 1 January or 31 December?
- Event cancellation: What transpires if a planned event is indefinitely delayed?
- Partial outcomes: A proposal passes the lower chamber yet fails in the upper chamber — how does "Will Congress pass X?" conclude?
Polymarket mitigates these through comprehensive resolution specifications within each market listing. Always examine the detailed terms 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 raise settlement uncertainty
- Track the UMA dispute dashboard to identify contested outcomes
- Include settlement duration in your profit projections (a 10% return over 6 months translates to ~20% on an annual basis)
Engage with PolyGram to trade markets featuring transparent resolution criteria. Start trading on PolyGram →