How Prediction Markets Actually Settle: Resolution Rules, Oracles, and Disputes (2026)

You buy YES on a prediction market. The event happens. You expect to get paid $1 per contract. For the vast majority of trades, that's exactly what happens — the market resolves, settlement follows within hours, and the money shows up in your account.

But "the vast majority" isn't all of them. When outcomes are ambiguous, when contract language doesn't perfectly match what happened in the real world, or when two platforms are looking at the same event and reaching different conclusions — that's when settlement becomes the most important part of the trade.

It's also, as thousands of Kalshi traders discovered after the Khamenei market controversy in late February 2026, the part with the least protection if something goes wrong.

This guide explains exactly how prediction market resolution works on the major US platforms, what happens when it breaks down, and what you can actually do about it.

Resolution vs. Settlement — The Distinction That Matters

These two terms get used interchangeably, but they describe different steps in the same process.

Resolution is the determination of which outcome won. Someone or something looks at the real-world event, compares it against the contract's criteria, and officially declares YES or NO.

Settlement is the financial transfer that follows. Winning contracts get credited at $1 each. Losing contracts go to zero. The money moves.

On Kalshi, settlement typically occurs within three hours of resolution, according to the platform's help documentation. On Polymarket, settlement follows the oracle process — which takes a minimum of two hours if uncontested, but can stretch to days or weeks if a dispute escalates through the full UMA Data Verification Mechanism.

The critical implication: settlement is not automatic. Before money changes hands, someone or something has to determine who won. That process is handled very differently depending on which platform — or more precisely, which underlying exchange — you're trading on.

How Kalshi Resolves Markets

Kalshi operates a centralized resolution model. Every market on the platform lists specific "Source Agencies" in its contract terms — the entities whose data determines whether you get paid. These are filed with the CFTC as part of Kalshi's self-certification process.

Source agencies vary by market category:

Market Category	Source Agencies	Settlement Method
Sports	Governing league (NFL, NBA, etc.), Associated Press, ESPN, WSJ, Fox Sports	Official final results as reported by source agencies
Crypto prices	CF Benchmarks Real-Time Indices	1-minute window of per-second observations at expiry; trimmed averaging excludes top/bottom 20%
Economics	BLS, BEA, Federal Reserve	Official government data release at specified time
Weather	NOAA, National Weather Service	Official recorded measurement at specified station

The actual decision sits with Kalshi's internal markets team. As the platform's help documentation puts it, outcomes are determined "when decided that resolution criteria has been met." Traders can submit a "Request to Settle" through the platform interface, but this functions as a suggestion — not a binding action. Kalshi's team makes the final call.

For ambiguous or disputed outcomes, Kalshi's rulebook provides for an Outcome Review Committee — a committee of the board that can make binding determinations. The platform can also invoke Rule 6.3(c), which allows it to settle a market at its last traded price if the outcome is deemed unresolvable. That rule became nationally relevant during the $47.3M Super Bowl halftime market in February 2026, when Kalshi invoked it after controversy over whether Cardi B's appearance constituted a "performance" under the contract's terms.

The critical limitation: there is no formal dispute process for traders. No independent arbitration. No external appeal. If you believe Kalshi resolved a market incorrectly, your documented options are email support and Discord.

As one commenter documented after a 2025 Oscars market grading error: "Yell at them in Discord."

How Polymarket Resolves Markets

Polymarket uses a decentralized resolution model built on UMA's Optimistic Oracle. The system is designed so no single entity decides outcomes — though that "in theory" qualifier matters more than most people realize.

The resolution flow follows a structured escalation (source: rocknblock.io UMA oracle analysis):

1. Proposal. When a market reaches its resolution date, anyone can propose an outcome by posting a $750 USDC bond.
2. Challenge period. A two-hour window opens. If nobody disputes, the outcome is accepted and the market settles.
3. First dispute (auto-reset). If someone disputes, the system resets — a new proposal is requested. The first dispute is effectively ignored to prevent frivolous challenges.
4. Second dispute (DVM escalation). If the second proposal is also disputed, the question escalates to UMA's Data Verification Mechanism, where UMA token holders vote on the correct outcome.
5. DVM vote. Voting takes 48–96 hours. Voters use a commit/reveal scheme and stake UMA tokens that can be slashed if they vote against the majority.

According to available platform data, roughly 98.5% of Polymarket markets resolve at the Optimistic Oracle layer without ever reaching the DVM. For straightforward binary outcomes — who won a game, what was the closing price of Bitcoin — the system works efficiently.

The structural risk: UMA's resolution mechanism is token-weighted. Per CoinGecko and DefiLlama data from early 2026, UMA's circulating market cap sits at approximately $44 million. Polymarket's total value locked was approximately $330 million (per DefiLlama, January 2026). That's a 15:1 ratio between the capital at risk on the platform and the cost of theoretically controlling the oracle that settles it.

Polymarket US vs. Polymarket International: these are not the same. On the US version, Polymarket's internal Markets Team directly determines outcomes. On the International version, the Markets Team provides clarifications but the UMA Oracle performs the actual resolution. The same market can follow a different resolution process depending on which version you're using.

When the Same Event Settles Differently

Settlement divergence isn't theoretical. It's happened multiple times in recent months, and the consequences were real.

The Cardi B Super Bowl halftime market (February 2026). Cardi B appeared on stage during Bad Bunny's halftime show, danced, and appeared to mouth lyrics. Kalshi's resolution criteria treated singing and dancing together as a "performance" — but the question was whether "just dancing in the background" qualified. $47.3 million in total halftime market volume on Kalshi.

Kalshi invoked Rule 6.3(c) and settled at the last traded price: $0.26 for YES holders, $0.74 for NO holders. One trader filed a CFTC complaint seeking $3,700.

Polymarket, operating under different contract language, resolved the same event as YES at $1 — paying out YES holders in full.

Same real-world event. Same moment. Different resolution criteria. Different outcomes.

The Khamenei market (February–March 2026). More than $54 million in total trading volume was placed on Kalshi's "Ali Khamenei out as Supreme Leader?" contract. When widespread media reports covered Khamenei's death on February 28, traders who held YES contracts expected full $1 payouts.

Instead, Kalshi invoked a "death carveout provision" buried in the contract terms — a clause stating that if a leader's departure is caused by death, the market settles at the last traded price rather than paying YES at $1. The platform settled at the pre-event trading price.

CEO Tarek Mansour defended the decision publicly, stating the rule was disclosed upfront and that Kalshi does not offer "death markets" — contracts that directly profit from someone's death. Kalshi reimbursed all trading fees and net losses so that no trader ended net-negative.

But a class action lawsuit was filed in US District Court for the Central District of California, with plaintiffs arguing the death carveout was "not incorporated into the user-facing rules summary" and failed to notify "reasonable consumers" (source: Blockonomi).

Kalshi has since codified the death settlement rule formally as Rule 6.3(e), so it applies by default to any contract tied to a living person — no longer buried in individual contract terms.

The App You're Using Doesn't Determine How Your Market Settles

This is the piece most prediction market users don't know: the app you're trading on doesn't determine how your contract resolves. The underlying exchange does.

Most prediction market apps are not independent exchanges. They're front-ends routing orders to licensed exchanges that handle the actual clearing, resolution, and settlement. That means when you trade through one of these apps, you inherit that exchange's resolution criteria, source agencies, and dispute process (or lack of one).

App	Routes Through	Resolution Process
Robinhood Predictions	Kalshi	Kalshi's internal team; no trader dispute mechanism
Coinbase	Kalshi	Kalshi's internal team; no trader dispute mechanism
PrizePicks	Kalshi	Kalshi's internal team; no trader dispute mechanism
Sleeper Markets	Kalshi (NFA approved Jan 2026)	Kalshi's internal team; no trader dispute mechanism
FanDuel Predicts	CME Group	CME Group resolution process
DraftKings Predictions	CME Group	CME Group resolution process
Fanatics Markets	Crypto.com CDNA	CDNA exchange resolution process

For a full breakdown of the US prediction market infrastructure map, see our platform directory.

The practical implication: if you're trading NFL markets on Robinhood and a resolution dispute comes up, Robinhood support is not who handles it. Kalshi is. The Robinhood app is a distribution layer — the actual exchange, with all its rules, is Kalshi.

What to Check Before Holding Through Settlement

Most settlement problems are avoidable if you read the right things before you trade.

Read the actual contract language, not just the title. On Kalshi, resolution criteria are in the contract terms — CFTC-filed PDFs and the market page. On Polymarket, they're in the market description and the ancillary data stored on-chain. The market title is marketing; the contract language is the law.

Identify the resolution source. Kalshi names specific source agencies for each market. Polymarket names resolution sources in the market description. If the source is ambiguous or undefined, treat that as a risk factor — especially for subjective or novel events.

Compare cross-platform criteria when arbitraging. If the same market exists on both Kalshi and Polymarket, read the resolution language side by side. Differences in wording — even subtle ones — can produce different outcomes when real-world events don't fit neatly into YES/NO categories. The Cardi B outcome wasn't a coincidence; it was a foreseeable divergence given the differing criteria.

Know which Polymarket version you're on. US vs. International means different resolution processes, even for the same market. Know which one applies to you before holding through a settlement event.

Check whether edge cases are addressed. For markets tied to living people, Kalshi's new Rule 6.3(e) now governs. Know what the rule says before buying.

Frequently Asked Questions About Prediction Market Settlement

How long does Kalshi take to pay out after a market resolves? According to Kalshi's documentation (source: news.kalshi.com), settlement occurs roughly three hours after resolution. Resolution itself takes 1–12 hours depending on the market type — sports markets are largely automated and typically resolve within 30–60 minutes of game end, while political and complex events can take up to 48 hours for manual verification.

What happens if Kalshi resolves a market incorrectly? There's no formal dispute mechanism for traders. Your documented options are emailing Kalshi's support team or raising the issue publicly on Discord or social media. Based on documented incidents, public pressure via social media has produced corrections in cases involving verifiable grading errors — but there is no structural guarantee of review, and corrections are at Kalshi's discretion.

Can I dispute a Polymarket resolution? On Polymarket International, yes — you can dispute by posting a $750 USDC bond and initiating the UMA escalation process. The DVM vote is considered final. On Polymarket US, the Markets Team determines outcomes directly; the dispute path is less clearly defined for US users.

What does "settling at the last traded price" mean? When a prediction market can't cleanly resolve to YES or NO — typically because a defined edge case applies — some platforms settle at the price the contract last traded at instead of paying one side $1. On a market trading at $0.40 before the triggering event, YES holders receive $0.40 per contract and NO holders receive $0.60. Neither side gets the full dollar.

If I trade through Robinhood, who handles resolution disputes? Kalshi does. Robinhood routes prediction market trades through Kalshi's exchange infrastructure, meaning Kalshi's resolution criteria, source agencies, and dispute process apply. Robinhood functions as a front-end and futures commission merchant; the actual exchange is Kalshi.

Does the same event always settle the same way on every platform? No. As the Super Bowl halftime market demonstrated, the same real-world event can settle differently on different platforms when the underlying contract language differs. Platforms write their own resolution criteria, and those criteria can produce divergent outcomes.

Conclusion

Settlement is where prediction market trades actually happen. Everything before it — your entry price, your conviction in the outcome, your position sizing — feeds into a single moment where the contract either pays $1 or goes to zero.

Understanding who controls that moment, what their criteria are, and what recourse you have when something goes wrong isn't optional if you're putting real money into these markets. Neither Kalshi nor Polymarket has a clean track record. Centralized settlement gives you speed and regulatory oversight at the cost of no independent appeals process. Decentralized settlement gives you public transparency and a dispute mechanism at the cost of a system that can be gamed by token concentration.

The platforms are building better infrastructure — Kalshi's new Rule 6.3(e), its expanded enforcement team, and the broader trend toward clearer contract language all point toward fewer surprises. But the best protection available to traders right now is reading the actual contract terms before you hold through settlement.

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