How Polymarket and Kalshi Markets Actually Resolve

Resolution — how a prediction market determines the outcome and pays out — is the most under-discussed topic in prediction market trading. Traders obsess over entry signals but ignore the mechanism that determines whether they actually get paid. This guide covers how Polymarket and Kalshi resolve markets, common pitfalls, and how to protect yourself.

## Polymarket Resolution

Polymarket uses the UMA (Universal Market Access) optimistic oracle for resolution. The mechanics:

**Step 1**: Market reaches its resolution time.

**Step 2**: Proposer submits the resolution outcome with a bond.

**Step 3**: Other UMA participants can dispute the proposal within a fixed window (typically 2 hours).

**Step 4**: If disputed, UMA voters resolve the dispute through a longer governance process.

**Step 5**: If not disputed, the proposed outcome stands and YES/NO tokens become $1/$0.

This system is "optimistic" because it assumes proposers are honest unless someone disagrees. Most resolutions are clean and proceed quickly. Disputes can take days.

## Kalshi Resolution

Kalshi operates as a CFTC-regulated exchange. Resolution is determined by Kalshi's compliance team based on the market's stated resolution source. For example, a market on "Will CPI exceed X%?" resolves based on the BLS official report.

Resolution is generally faster than Polymarket because there's no dispute mechanism — Kalshi staff makes the call. But this also means you have less recourse if you disagree.

## When Resolution Goes Wrong

Most resolutions are clean. But ambiguous or surprising cases create real losses for traders who didn't think about resolution mechanics. Examples:

**Ambiguous timing**: "Will X happen by Dec 31?" — does X happening on Dec 31 at 11:59 PM UTC count? What time zone? What's "by"?

**Source ambiguity**: market says "will resolve YES if Wikipedia shows X". Wikipedia gets edited mid-day. Which version counts?

**Edge case events**: market on "Will Project X launch?" Project launches a buggy version. Was that a "launch"?

**Cancelled events**: planned event gets postponed. Market may resolve based on the new date, the original date, or be cancelled entirely.

**Multiple meanings**: "Will the team make the playoffs?" — what if they're tied for last spot in a tiebreaker scenario?

For each potential trade, read the resolution criteria multiple times. Check comments for clarifications. If ambiguity exists, skip the market.

## Resolution Risk in Pricing

Sophisticated traders price in resolution risk explicitly. A market with clear resolution might trade tighter to "fair" probability. A market with ambiguous resolution trades with built-in discount for resolution uncertainty.

If you see a market that seems mispriced by 10pp, check if there's resolution ambiguity. If yes, the apparent edge may just be compensation for risk. The pros are already accounting for what you're missing.

## Dispute Periods

For Polymarket, the typical dispute period is 2 hours after resolution proposal. During this time: - Traders can dispute the outcome - Markets remain in "pending resolution" state - Tokens haven't yet converted to cash

For high-value positions, monitor the dispute window. If you have strong evidence the resolution is wrong, you can dispute (requires a bond and risks losing it if your dispute is rejected).

For most retail traders, accepting the resolver's judgment is the right call. Disputes are for cases where you have specific evidence and capacity to argue UMA voting.

## UMA Voting

When disputes occur, UMA token holders vote on the correct outcome. This: - Takes days (typically 3-7) - Requires technical understanding to follow - Has its own politics (large UMA holders dominate) - Can produce surprising outcomes

Polymarket has had several high-profile disputes that took weeks to resolve. During this time, traders had locked-up capital and no certainty of payout.

## Strategies to Mitigate Resolution Risk

**Read criteria carefully**: every market, every time. The wording matters.

**Avoid ambiguous markets**: if you can read the criteria and not be sure how it resolves in edge cases, don't trade it.

**Watch the comments**: traders often debate resolution criteria in market comments. If active disputes exist, others are confused too.

**Size smaller on ambiguous markets**: if you must trade something with resolution risk, smaller position protects you.

**Plan for delays**: assume potentially-disputed markets take 2-4 weeks to fully resolve. Don't tie up capital you need sooner.

**Track resolution history**: how have similar markets resolved historically? Pattern matters.

## Kalshi-Specific Considerations

Kalshi resolutions are generally cleaner because: - The platform is regulated (must follow stated procedures) - Single decision-maker (Kalshi staff) - Less ambiguity in market design

But also: - Less recourse if you disagree - No formal dispute mechanism - Tied to specific official data sources

For US users, Kalshi resolutions are similar in spirit to traditional derivative settlements.

For our broader Kalshi vs Polymarket comparison, see [our platform comparison](/blog/kalshi-vs-polymarket-comparison).

## What to Do When You Disagree With Resolution

For Polymarket: 1. Read the official resolution and proposal 2. Check the resolution criteria one more time 3. If you genuinely believe it's wrong with specific evidence, you can dispute (but understand the UMA process) 4. Most often, the resolution is technically correct under the criteria even if it feels wrong

For Kalshi: - Contact Kalshi support - Document your concern with evidence - Recourse is limited but support is responsive for legitimate issues

## Bottom Line

Resolution is when trades actually pay out — and where many traders discover their "edge" was an illusion built on misunderstood criteria. Always read resolution mechanics. Skip ambiguous markets. Size smaller on uncertain resolutions.

The traders who consistently profit understand resolution as deeply as entry signals. The traders who lose discover resolution mechanics only when their trade resolves unexpectedly.

For broader strategy framework that builds in resolution awareness, see our [+EV markets guide](/blog/how-to-find-ev-markets-polymarket).