What Is a Swap? A Plain-English Explainer for Prediction Market Traders

If you have followed the Kalshi court fights, one word keeps coming up: swap.

Judges in the Ninth Circuit, the Third Circuit, and the Northern District of Illinois are all arguing over it. The question sounds dry. Is a contract on a sports game a "swap" or not? The answer decides whether federal regulators or state governments control a huge part of the prediction market industry.

This guide explains what a swap is, where the idea came from, and why it matters to anyone who trades event contracts. No finance degree needed.

The Short Answer

A swap is an agreement between two parties to exchange payments based on something that is uncertain. The payments depend on a rate, a price, or an event. Each side is betting, or hedging, on how that thing turns out.

That definition is simple. The legal definition is much wider, and that gap is the reason for the lawsuits.

Swaps Start With a Simple Idea: Trading Risk

Imagine you own a small business and borrow money at a variable interest rate. Your payments go up when rates rise. That makes budgeting hard.

A bank, meanwhile, is happy to take on rate risk because it makes money from it. So the two of you agree to a deal. You pay the bank a fixed amount each month. The bank pays you whatever your variable rate costs. In effect, you have swapped your variable payment for a fixed one.

Nobody swapped the loan itself. The two sides swapped the risk attached to it. That is the heart of every swap.

Common Types of Swaps

The financial world uses several kinds. Here are the main ones.

Interest rate swaps. The most common type. One side pays a fixed rate, and the other pays a floating rate. Companies use them to lock in predictable costs.

Currency swaps. Two parties exchange payments in different currencies. A company that earns in euros but owes dollars might use one to reduce exchange rate risk.

Commodity swaps. One side pays a fixed price for something like oil or natural gas, and the other pays the market price. Airlines, for example, use them to manage fuel costs.

Credit default swaps. One side pays regular premiums. The other agrees to pay out if a borrower defaults on its debt. The buyer is protected against a loss, much like insurance, though no insurance license is required and the buyer need not own the debt.

Total return swaps. One side hands over the return on an asset, like a bond or index, in exchange for fixed payments.

Each one has the same skeleton. Two parties agree on a formula. Money changes hands depending on how something uncertain plays out.

Why Swaps Became a Regulatory Issue

For decades, most swaps were private deals. Banks and big companies wrote them directly with each other, often over the phone. This is called the over-the-counter market. Regulators could not easily see who owed what to whom.

That blind spot became a problem in the 2008 financial crisis. Credit default swaps were a major part of the story. Large institutions had sold huge amounts of protection without enough capital behind it. When defaults rose, the damage spread across the system.

In 2010, Congress passed the Dodd-Frank Act in response. It brought swaps under federal oversight and gave the Commodity Futures Trading Commission, or CFTC, major authority over them. The rules pushed many swaps toward regulated trading venues and clearinghouses, with reporting requirements to give regulators a view of the market.

So the word "swap" in federal law is not casual. It triggers a whole regulatory system.

What the Law Says a Swap Is

The Commodity Exchange Act, the main federal law covering futures and derivatives, defines "swap" at 7 U.S.C. § 1a(47). The definition is long and deliberately broad. It covers many familiar products, like interest rate and currency swaps.

The part that matters most for prediction markets is the clause about events. In plain English, it covers an agreement that provides for a payment or delivery depending on whether an event or contingency happens, or how far it happens, when that event is associated with a potential financial, economic, or commercial consequence.

Three things follow from that wording.

First, a swap does not need to involve a bank or a rate. An event can be enough.

Second, the event has to carry a financial, economic, or commercial consequence. That phrase is where the arguments start.

Third, the clause covers events that happen, events that do not happen, and the extent to which they happen. That is wide ground.

Why This Is Important for Prediction Markets

Now connect the dots to Kalshi.

Kalshi operates as a designated contract market, or DCM. That is an exchange registered with the CFTC. Under the Commodity Exchange Act, the CFTC has exclusive jurisdiction over swaps and futures traded on these exchanges.

So the logic runs like this:

1. If a contract is a swap and trades on a DCM, federal law governs it.

2. If federal law governs it, state laws that try to control it may be preempted, meaning overridden.

3. If the contract is not a swap, states have more room to treat it as ordinary gambling and enforce their sports wagering laws.

That is why both sides fight so hard over one word. Kalshi says its sports contracts are swaps. States like Nevada and Illinois say they are bets.

The Case That a Sports Contract Is a Swap

Kalshi and its supporters, including Coinbase and the CFTC in some filings, make a straightforward argument. A contract that pays out based on an event, here a game result, fits the plain text of the swap definition. They say the statute's language is broad on purpose.

They also point to economic consequences. A judge in Illinois recently walked through the real-world money riding on game outcomes:

• Broadcasters earn more ad revenue when a playoff series goes longer. The court cited an estimate that the gap between a four-game and a seven-game NBA series could cost a network tens of millions of dollars.

• Arenas and concession companies often receive a share of sales, so their revenue rises with the number of games played.

• Sponsors see better returns when the athletes they back perform well.

The judge noted that, at a financial level, sports bets can resemble credit default swaps. Someone with exposure to an outcome can use the contract to hedge that exposure. That is what a swap does.

The Case That It Is Just a Sports Bet

States and tribes see it differently. Their argument is that an obvious sports wager does not become a financial instrument because it is traded on a regulated exchange.

The Ninth Circuit agreed in its August 28, 2026 decision. It held that sports event contracts likely are not swaps under the Commodity Exchange Act. Part of its reasoning was a distinction between an event and an outcome.

On that view, a game is the event. Who wins is the outcome of that event. The statute covers events that carry economic consequences, the argument goes, not the results of games.

The court also leaned on context. Congress had a special rule about gaming contracts in the statute, and the CFTC had its own Rule 40.11, which bars exchanges from listing contracts involving gaming. The panel read those as signs that Congress and the agency did not treat gaming contracts as ordinary swaps.

A Baseball Example That Shows the Disagreement

The Illinois opinion includes a neat table built on the Chicago Cubs. It compares two contracts.

Contract A: "Will the Cubs win the game against the Reds on August 28, 2026?"

Contract B: "Will the Cubs' season-long record be 77-58 on August 29, 2026?"

Here is how the court and Illinois read them:

• The court's reading: Both are swaps. In Contract A, the win itself is the event. In Contract B, the event is the season-long record.

• Illinois's reading: Contract A is not a swap, because the game is the event and the win is only its result. Contract B is a swap, because the event is the season-long record.

This small example shows the whole fight. The same words, "event" and "outcome," lead to different answers depending on where you draw the line.

Where the Courts Stand Right Now

The courts have not agreed with one another.

Ninth Circuit (Nevada). On August 28, 2026, a three-judge panel held that sports event contracts likely are not swaps. Kalshi has asked for rehearing, and Nevada's counsel has pushed back.

Third Circuit (New Jersey). This court reached the opposite result. It focused on the breadth of the statutory text and found it broad enough to reach these contracts.

Northern District of Illinois. On October 2, 2026, Judge Martha Pacold found that Kalshi's core sports contracts are likely swaps and that much of Illinois law is likely preempted. That ruling is at the preliminary stage. It is not a final decision.

Because two federal appeals courts disagree, several parties, including New Jersey, Robinhood, and Crypto.com, have asked the Supreme Court to step in. When circuits split on a major question of federal law, that is often how the Supreme Court gets involved.

The CFTC's Role

You might expect the CFTC to settle the matter. It has not yet, at least not in a way courts have treated as final.

The agency has broad discretion over what can trade on a DCM. Under the statute's special rule and Rule 40.11, it can review contracts that involve gaming and decide whether they serve the public interest.

According to the Illinois opinion, the CFTC has never held that Kalshi's contracts are impermissible gaming contracts, and it has never ordered Kalshi to remove them. The Ninth Circuit treated Rule 40.11(a) differently. It read the rule as already barring the listing of such contracts, whether or not the agency has acted.

The CFTC has also said it plans to revise Rule 40.11. Kalshi argues that a new rule could change the legal picture. Nevada's counsel says the panel's reasoning does not depend on the rule alone. The details of any rewrite will matter a great deal.

What This Means for Traders

You do not need to follow every brief to see how the swap question touches you.

Availability. If courts treat sports event contracts as swaps, they are more likely to stay available nationwide under federal oversight. If courts treat them as bets, states may be able to restrict or license them.

Uneven rules by region. Until the split resolves, the answer can look different depending on where a case is heard. Enforcement can pause in some states and continue in others.

Product design. Exchanges may reshape contracts to fit legal lines. Whether a contract resembles an event or an outcome could affect what gets listed.

Timing. Rehearing decisions, a CFTC rule revision, and Supreme Court petitions could all land in the coming months. Any one of them could shift things quickly.

None of this is legal advice. It is a map of the main issues so you can read the news with context.

Common Misconceptions About Swaps

"A swap always involves banks." No. Many swaps do, but the legal definition reaches contracts based on events, too.

"Calling something a swap means it is not gambling." The label alone does not decide it. Courts look at statutory text, context, and purpose, and they can disagree.

"Federal regulation means no state oversight." Not exactly. Preemption applies when federal law covers the field or conflicts with the state rule. Courts are still deciding how far that goes here.

"The CFTC has already ruled on sports contracts." According to the Illinois opinion, the agency has not formally held these contracts impermissible, though its stance is part of the ongoing debate.

Why One Word Carries So Much Weight

It is rare for a single defined term to decide who regulates a multibillion-dollar market. Here it does.

If sports event contracts are swaps, the CFTC is the main referee, and state gaming laws face a hard fight. If they are not swaps, states keep strong authority, and exchanges must deal with a patchwork of rules.

That is why you will keep seeing the word in headlines. Every ruling, appeal, and rule change now comes back to the same question: what is a swap?

FAQ

What is a swap in simple terms?

It is an agreement where two parties exchange payments based on something uncertain, like an interest rate, a price, or an event.

Is a Kalshi contract a swap?

It depends on who you ask. Kalshi, Coinbase, and a federal judge in Illinois say its core sports contracts likely are. The Ninth Circuit said sports event contracts likely are not.

Why does it matter whether a contract is a swap?

Swaps traded on registered exchanges fall under exclusive CFTC jurisdiction. That can override state gambling laws.

What is a designated contract market?

It is an exchange registered with the CFTC to list contracts for trading, such as futures and swaps.

What is preemption?

It is when federal law overrides a conflicting state law.

Will the Supreme Court decide this?

Possibly. Several parties have asked it to review the split between the Third and Ninth Circuits.

Is this legal or financial advice?

No. This article is general information. Talk to a qualified professional about your own situation.