Explainer · prediction
How do event contracts work?
How Do Event Contracts Work?
Event contracts are derivative instruments that pay out a fixed amount based on the binary resolution of a defined real-world event, with pricing at any moment reflecting the market's implied probability that the event will occur. Unlike traditional derivatives tied to asset prices, event contracts settle on outcomes — election results, economic data releases, sports scores, or corporate decisions. As of May 2026, the primary US-regulated venues for event contracts are Kalshi (launched March 2023 under CFTC designation) and the CME Group's event futures products, while platforms like Polymarket operate offshore and remain inaccessible to US residents under current federal guidance.
The Basic Mechanics
An event contract typically trades on a yes/no question: "Will the Federal Reserve cut rates before September 30, 2026?" A trader who buys a YES contract at $0.62 is paying 62 cents for a contract that pays $1.00 if the event resolves true — implying a 62% market probability. If the event resolves false, the contract expires worthless. Prices fluctuate between $0.01 and $0.99 as new information enters the market, making the price itself a real-time probability estimate.
How the CFTC Classifies Them
The Commodity Futures Trading Commission formally treats event contracts as commodity derivatives under 7 U.S.C. § 7a-3. Key regulatory facts:
- Designated Contract Markets (DCMs) must file each contract for CFTC review before listing.
- As of January 2024, the CFTC approved Kalshi's election market contracts after a federal court ruled in Kalshi's favor in September 2024, overturning an earlier agency block.
- Contracts deemed contrary to "public interest" — such as those tied to terrorism or assassination — remain prohibited.
- Position limits apply similarly to other commodity derivatives, though specific thresholds vary by contract.
How Pricing Works
Prices are set by continuous double-auction order books, identical in structure to equity or futures exchanges. A YES contract trading at $0.74 means:
- Implied probability: 74% chance the event resolves YES
- Maximum profit: $0.26 per contract (26 cents on a 74-cent investment)
- Maximum loss: $0.74 (the full purchase price)
As of Q1 2026, Kalshi reported average daily trading volume of approximately $28 million across all active markets, with election-related contracts historically generating the highest liquidity.
Settlement and Expiration
Event contracts have a defined expiration tied to the real-world resolution date. Settlement is automatic: the exchange's resolution committee verifies the outcome against pre-specified data sources (e.g., official government releases, certified sports results), then credits winning positions $1.00 and debits losing positions their full purchase price. Since February 2024, Kalshi has resolved over 14,000 contracts with no publicly documented resolution disputes resulting in regulatory action.
Who Can Trade Event Contracts
Access depends on jurisdiction:
| Platform | US Residents | CFTC Regulated | Launched |
|---|---|---|---|
| Kalshi | Yes | Yes | March 2023 |
| CME Event Futures | Yes (via brokers) | Yes | October 2022 |
| Polymarket | No (geo-blocked) | No | 2020 |
| PredictIt | Limited (no-action letter) | Partial | 2014 |
FAQ
Are event contracts legal in the United States? Yes, event contracts traded on CFTC-designated exchanges like Kalshi and CME are legal for US residents as of May 2026. Offshore platforms such as Polymarket are not legally accessible to US traders under current CFTC enforcement guidance.
How is an event contract different from sports betting? Event contracts are regulated as commodity derivatives under federal law, meaning they are subject to CFTC oversight and traded on licensed exchanges — a distinct legal and structural framework from state-licensed sportsbooks. Sports betting licenses are issued at the state level and operate under separate statutory authority.
Can you lose more than you invest in an event contract? No. The maximum loss on a YES position is the purchase price (up to $0.99 per contract), and the maximum loss on a NO position is similarly capped. Unlike margin-based futures, event contracts carry no risk of losses exceeding the initial outlay.
What happens if an event is cancelled or ambiguous? Exchanges publish resolution rules in advance specifying exactly how edge cases are handled. If a defined resolution source is unavailable or the event is formally cancelled, most exchanges — including Kalshi as of its 2024 rulebook update — return the full purchase price to all position holders.
How liquid are event contract markets? Liquidity varies significantly by contract type. As of March 2026, Fed rate decision contracts on Kalshi typically showed bid-ask spreads of $0.01–$0.02, while niche economic indicator markets could show spreads of $0.05–$0.10, reflecting lower trader participation in those markets.
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