How Markets Resolve: Rules & Edge Cases

What is Market Resolution?

Resolution is the process by which a prediction market determines its outcome and distributes payouts. When a market "resolves," the event it was tracking has occurred (or not), and shares either pay out $1.00 (correct outcome) or $0.00 (incorrect outcome). Understanding how resolution works is crucial because it directly determines whether you get paid.

Resolution Sources

Each market on Polymarket has a designated resolution source — the authoritative reference used to determine the outcome. Common resolution sources include:

• Official results: Government agencies, election commissions, central banks (e.g., "The Federal Reserve's FOMC statement")
• Data providers: CoinGecko for crypto prices, Associated Press for election calls, major wire services for news events
• Automated data feeds: For markets tied to specific numeric outcomes (prices, temperatures, scores)
• Polymarket's resolution committee: For markets that require human judgment or when the primary source is unclear

Resolution Timeline

Markets don't always resolve the moment an event occurs. The process typically follows this timeline:

1. Event occurs: The real-world event happens (or the deadline passes)
2. Resolution source confirms: The designated source publishes its determination
3. Market resolves: Polymarket officially resolves the market based on the source
4. Payout: Funds are distributed to winning shareholders

This process usually takes hours to a few days, depending on the market. Some markets (like "Will X happen by December 31?") don't resolve until after their end date, even if the outcome becomes clear earlier.

Edge Cases and Disputes

Most markets resolve cleanly, but edge cases do occur. Here are common scenarios:

Ambiguous outcomes: Sometimes the real world doesn't produce a clean yes/no result. For example, if a market asks "Will Congress pass X bill?" and the bill passes but in a substantially amended form, there may be disagreement about whether that counts.

Disputed events: Election results that are contested, sports events with controversial officiating calls, or news events where different sources report conflicting information can all create resolution uncertainty.

Market voiding: In rare cases, a market may be voided — meaning all shares are returned at their purchase price. This typically happens when the market question becomes meaningless (e.g., an event is cancelled) or when it's impossible to determine the outcome.

Early resolution: Some markets may resolve before their stated end date if the outcome becomes certain. For example, a "Will X happen in 2025?" market might resolve "Yes" in March 2025 if the event has already occurred.

How to Protect Yourself

To minimize resolution risk:

• Read the resolution criteria carefully: Before trading, understand exactly how the market will be resolved and what counts as "Yes" vs. "No"
• Check the resolution source: Make sure the designated source is reputable and likely to provide a clear determination
• Be wary of vague wording: Markets with subjective or ambiguous criteria carry higher resolution risk
• Consider partial exit before resolution: If the outcome is uncertain but prices have moved in your favor, consider selling some shares to reduce your exposure to resolution risk

UMA Oracle System

Polymarket uses UMA's optimistic oracle system for resolution. This means:

1. A proposer submits the resolution (e.g., "This market resolved Yes")
2. There's a challenge period where anyone can dispute the proposed resolution
3. If disputed, UMA token holders vote on the correct resolution
4. The final resolution is binding and payouts are distributed

This decentralized system adds transparency but can occasionally lead to delays when markets are disputed. Most markets resolve without disputes, but high-profile or ambiguous markets may go through the dispute process.