An event contract is a financial derivative that pays out $1 if a defined real-world event happens and $0 if it doesn’t — so its price, somewhere between 1 and 99 cents, reads directly as the market’s implied probability of that outcome. In the United States, event contracts are regulated by the Commodity Futures Trading Commission (CFTC) as derivatives, not as gambling, and they trade on federally licensed exchanges rather than at a sportsbook.

That legal status is the whole story. “Event contract” is the regulatory name for the instrument that powers prediction markets like Kalshi and Polymarket, and understanding it explains why you can now trade the outcome of an election, an interest-rate decision, or a football game on the same kind of exchange that lists oil and wheat futures. This guide explains what event contracts are, how they work, whether they’re legal, who offers them, and how the CFTC is reshaping the rules as of July 2026.

Key takeaways

  • An event contract is a binary derivative — a yes/no position on whether a defined future event occurs, settling at $1 if you’re right and $0 if you’re wrong.
  • The price is the probability. A contract trading at 30 cents implies a 30% chance; because “Yes” and “No” always sum to $1, the price is the crowd’s live estimate of the odds.
  • They’re CFTC-regulated derivatives, not bets. Event contracts trade on designated contract markets (DCMs) supervised by the CFTC under the Commodity Exchange Act — the same framework that governs futures.
  • Volume has exploded. Trading across CFTC-designated contract markets exceeded $25 billion in 2025, and the category has kept accelerating through 2026.
  • The rules are being rewritten. On June 10, 2026, the CFTC proposed a new framework clarifying which event contracts are allowed — approving most whole-game sports outcomes while scrutinising contracts tied to enumerated activities like gaming.

What is an event contract, exactly?

An event contract is an agreement whose value depends on whether a specified event occurs. You take a side by buying either “Yes” or “No,” and when the event resolves, each contract you hold is redeemed for exactly $1 or $0. In legal terms, the CFTC describes these as agreements “based upon an occurrence, extent of an occurrence, or contingency” — a definition broad enough to cover everything from “Will US CPI exceed 3.0% in July 2026?” to “Will this team win Sunday’s game?”

The instrument is deliberately simple, and that simplicity is what makes it useful. Because a winning contract is always worth $1, a rational buyer will pay no more than their honest estimate of the odds. Multiply that across thousands of traders staking real money and the price settles at the market’s collective probability. That mechanic — a price that is a forecast — is what separates an event contract from a lottery ticket, and it’s why the markets built on them double as forecasting tools. We walk through the full mechanic in our guide to how prediction markets work.

How event contracts work

Every event contract is built around a question with a clear, objective resolution rule. Here is the mechanic that makes the instrument function:

  • Each contract settles at $1 or $0. If your side is correct, every contract pays out exactly $1. If it’s wrong, it expires worthless.
  • Contracts trade between 1 and 99 cents. A “Yes” at 30 cents costs 30 cents and pays $1 if you’re right — a bit more than 3x. A “Yes” at 90 cents costs 90 cents to make 10, because the market thinks the event is very likely.
  • Yes and No always add up to $1. If “Yes” is 30 cents, “No” is 70 cents. A buyer of “Yes” is effectively matched against a buyer of “No,” and the exchange settles the pair once the outcome is known.
  • Your downside is fixed. Unlike leveraged futures or margin trading, you can never lose more than you paid. Buy at 40 cents and 40 cents is your maximum loss, known in advance — there’s no margin call.
  • You can exit before resolution. If your “Yes” contract climbs from 30 to 55 cents as the news turns your way, you can sell and lock in the gain, exactly like trading a stock.

This binary, loss-capped structure is why the instrument is often called a “yes/no contract” or a “binary option” — though regulated event contracts are a distinct, exchange-listed product, not the offshore “binary options” the SEC has warned about for years.

Event contracts vs prediction markets vs betting

These three terms get used interchangeably, but they describe different layers of the same system.

  • Event contracts are the instrument — the actual derivative you buy and sell.
  • A prediction market is the venue — the exchange where event contracts are listed, priced, and matched. Kalshi and Polymarket are prediction markets; the contracts you trade on them are event contracts.
  • Sports betting is a different structure entirely. A sportsbook sets the odds and profits when you lose, taking the other side of your wager. An event-contract exchange is peer-to-peer: other traders set the price through buying and selling, and the exchange earns trading fees regardless of who wins. That difference in incentives is at the heart of the fight over whether prediction markets are replacing sportsbooks.

The regulatory upshot: a CFTC-regulated event contract is supervised as a derivative by a financial regulator, while a sports bet is supervised by a state gaming commission. Same-looking wager, entirely different rulebook — and that distinction is exactly what the courts and the CFTC have spent the past two years fighting over.

Yes — event contracts are legal when they trade on a CFTC-regulated exchange, though the boundaries are actively contested. The legal foundation is the Commodity Exchange Act, which lets designated contract markets list event contracts after self-certifying that a product complies with the law and CFTC rules. The regulator then has a window to review and, if necessary, challenge the listing.

The limits come from a Dodd-Frank Act provision (Section 5c(c)(5)(C) of the Commodity Exchange Act) that singles out certain “enumerated activities.” Contracts referencing terrorism, assassination, war, gaming, or activity unlawful under federal or state law can be prohibited if the CFTC finds them contrary to the public interest. The word doing the heavy lifting there is “gaming” — because if sports contracts count as gaming, much of the industry’s fastest-growing volume could be at risk.

That question has already been through the courts. In September 2024, a US District Court ruled in Kalshi’s favour on election contracts, clearing the way for the first legal US election markets in over a century. Since then the battle has shifted to sports and to individual states, several of which have issued cease-and-desist orders. We map the current state-by-state picture in are prediction markets legal in the US?.

The CFTC’s June 2026 rulemaking, explained

On June 10, 2026, the CFTC issued a Notice of Proposed Rulemaking that would substantially revise how event contracts are policed — the clearest attempt yet to draw the line between an allowed contract and a prohibited one. It amends CFTC Regulation 40.11 and adds a new Appendix F, laying out a structured framework the Commission would apply contract-by-contract.

Three changes matter most:

  • A defined review process. The proposal formalises the timeline and procedural protections for reviewing a self-certified contract, giving exchanges more certainty about how and when the CFTC will weigh in.
  • A clearer definition of “gaming.” The rule proposes to define gaming as activities “governed by rules” whose outcomes “depend on the participants’ luck, skill, or athletic ability” — the category that determines whether a sports contract is presumptively suspect.
  • A public-interest test. The Commission would weigh factors like price-discovery utility, market-integrity threats, and compliance capacity, with no single factor treated as decisive.

The practical signal for traders is in how the framework treats sports. Contracts settling on the overall outcome of a game generally lean toward approval, while contracts on player injuries, officiating decisions, or discrete in-game actions face disapproval — a distinction rooted in insider-information and integrity concerns. In other words, “who wins the Super Bowl” is likely fine; “will this quarterback get injured” is not.

Who offers event contracts?

The market splits into two roles that are easy to confuse: exchanges that list the contracts and brokers that give you access to them.

  • Kalshi (KalshiEx LLC) is a CFTC-designated contract market — an exchange that defines each contract’s wording, settlement, and resolution rules, then matches trades on its own order book. It processed roughly $21.1 billion in volume in June 2026 and was reportedly raising money at a $40 billion valuation. See our full breakdown of what Kalshi is.
  • ForecastEx, owned by Interactive Brokers, is a second CFTC-regulated exchange listing event contracts.
  • Polymarket is a crypto-native venue where trades settle in stablecoins on a blockchain, historically limiting US access before securing a regulated US path in 2026. Our head-to-head compares Kalshi vs Polymarket.
  • Robinhood and Crypto.com act as brokers, not exchanges. Robinhood Derivatives, LLC — a CFTC-regulated, NFA-member firm — routes your event-contract orders to underlying exchanges including KalshiEx and ForecastEx, handling the app, execution, and customer funds while the exchange defines the contract.

If you’re wondering how Polymarket’s blockchain settlement works under the hood, the dollar-pegged tokens it uses are covered in our explainer on stablecoins.

What to know before trading event contracts

Event contracts are real financial instruments with real risk. As of July 2026, keep a few things in mind:

  • You can lose your entire stake. A losing contract goes to $0. The trade-off is that your downside is capped at what you paid.
  • Liquidity matters. Thinly traded contracts can swing sharply and be hard to exit at a fair price; well-funded markets are better calibrated.
  • The rules are still moving. The CFTC’s proposed framework, ongoing enforcement actions, and state-level challenges could change what’s available to trade.
  • It’s a tool for views, not free money. Well-calibrated markets are hard to beat consistently. Treat a contract as a way to price a probability, not as an edge.

The bottom line

An event contract is the simplest derivative in finance: a yes/no claim on the future that pays $1 or $0, whose price is the market’s live estimate of the odds. What makes it powerful is not the payout but the plumbing — CFTC regulation turns a wager into a supervised financial instrument, listed on exchanges alongside futures and accessible through mainstream brokers. With volume past $25 billion and a new federal rulebook taking shape in 2026, event contracts have moved from a legal curiosity to one of the fastest-growing corners of US markets — and the fight over which contracts are allowed is only beginning.

Frequently asked questions

What is an event contract in simple terms?

An event contract is a yes/no financial contract on whether a specific future event will happen. It costs between 1 and 99 cents, pays out $1 if you’re right and $0 if you’re wrong, and its price reflects the market’s implied probability of the event. You can also sell your position before the event resolves, just like trading a stock.

Are event contracts the same as prediction markets?

Not exactly. An event contract is the instrument you trade, while a prediction market is the exchange where those contracts are listed and priced. Kalshi and Polymarket are prediction markets; the yes/no positions you buy on them are event contracts. People often use the terms interchangeably, but one is the product and the other is the venue.

Yes, when they trade on a CFTC-regulated exchange. Event contracts are supervised as derivatives under the Commodity Exchange Act, and exchanges can list them after self-certifying compliance. However, contracts touching “enumerated activities” like gaming can be restricted, and sports contracts in particular face ongoing CFTC rulemaking and state-level legal challenges as of 2026.

How are event contracts different from sports betting?

A sportsbook sets the odds and profits when you lose, taking the other side of your bet. An event-contract exchange is a peer-to-peer market where other traders set the price and the exchange earns trading fees regardless of the outcome. Legally, a regulated event contract is a CFTC-supervised derivative, whereas a sports bet is overseen by a state gaming commission.

Who offers event contracts?

CFTC-designated exchanges like KalshiEx and ForecastEx (owned by Interactive Brokers) list event contracts directly, and Polymarket offers them on crypto rails. Brokers such as Robinhood Derivatives and Crypto.com give retail traders access by routing orders to those exchanges, handling the trading app, execution, and customer funds.

Sources