Prediction Markets & Event Contracts
A prediction market is an exchange where you trade yes/no contracts on real-world events, from game winners to Fed decisions, and every contract price doubles as a probability: a share trading at 60 cents means the market collectively puts roughly a 60 percent chance on that outcome. In the US these are event contracts, regulated federally by the Commodity Futures Trading Commission (CFTC) rather than by state gambling boards.
This page is the front door to prediction markets on GamblingSite.com: what the contracts are, how the prices work, where the law stands, what trading actually costs, and how the venues differ. Platform facts on this page come from our sourced facts ledgers, last verified August 17, 2026, and the regulatory picture is re-grounded against dated primary sources on every update. Last tested September 2026.
What this page covers, and what it doesn’t
Covered: US-accessible, CFTC-regulated prediction markets and event contracts, their mechanics, costs, and legal posture. Polymarket here means Polymarket US, the CFTC-regulated exchange, not the separate international crypto product. Not covered: offshore or unregulated venues (never recommended), and per-state eligibility calls, which shift with active litigation; the app’s own eligibility screen is always the final word.
Start With the Head-to-Head
If you already know what event contracts are and just want to pick a venue, the flagship comparison answers that in one read. It is the most data-backed page in this section: every fact traces to a sourced ledger, and the price table is live.
Flagship comparison
Kalshi vs. Polymarket: the head-to-head
The two venues that define US prediction markets, compared on regulation, fees, funding rails, market depth, and taxes, with live prices on the same futures from both venues plus the sportsbook consensus, refreshed through the day.
Prediction Market Guides on This Site
The section’s guides, in reading order for a newcomer. More are on the way: state-by-state legality, fees, taxes, and per-platform walkthroughs all publish here as they clear review.
What Can You Trade On?
Almost anything with a clear yes/no resolution. The big categories are politics and elections, economics (Fed decisions, inflation prints, jobs numbers), sports outcomes, weather and climate readings, entertainment and awards, and company or technology milestones. Each market states its resolution source up front, which is what separates a tradable contract from a bar argument.
The scale is no longer niche. Industry reporting put combined global prediction-market volume around $24 billion in the month of April 2026 alone, and NBC News counted more than $197 million already traded across 1,408 open markets on the 2026 midterm elections at the two big US venues as of July 2026. Election cycles are the traffic spikes; sports and economics carry the everyday volume.
Not every category is available to every trader: sports contracts are the contested edge of the legal map, and some venues carve their menus differently by state. The legality section below covers how to read that landscape.
How Prediction Market Prices Work
Every contract price is a probability in disguise. Contracts settle at $1 if the event happens and $0 if it does not, so a yes share trading at 34 cents is the market saying, in aggregate, that the outcome has about a 34 percent chance. Those are market-implied probabilities, not anyone’s forecast, and they move whenever traders disagree hard enough to move the order book.
Because traders trade against each other rather than against a bookmaker, there is no built-in vig in the price itself; the venue takes its cut as an explicit trading fee instead. That structural difference is why the same future can carry a slightly different implied probability on an exchange than at a sportsbook, a gap we measure daily on our Divergence Board, which ranks where prediction-market prices and the sportsbook consensus disagree most.
A worked example
Buy 100 yes shares at 34 cents and you have $34 at risk; settlement pays $100 if the event happens, zero if it does not. If news later moves the price to 60 cents, you can hold to settlement or sell right there for $60 and lock in $26 before fees, without the event ever resolving. That sell-the-position exit is the single biggest practical difference from a sportsbook ticket.
Prices also react to information fast, sometimes faster than the news cycle itself; we wrote up why in why betting markets sometimes move before the news breaks. The practical reading habit: treat the price as the crowd’s live estimate, ask what you know that the crowd might not, and remember that a 60 percent chance still misses two times out of five.
Getting Started: Your First Event Contract
The mechanics take about ten minutes end to end. The judgment is the part that takes practice.
- Pick a regulated venue. Stick to CFTC-regulated exchanges; the comparison at the top of this page is the fastest way to choose between the two incumbents.
- Verify and fund. Identity checks are mandatory, and the main funding rails are free at both big venues.
- Read the market’s rules before the price. The resolution source and deadline define what you are actually buying; misreading them is the classic rookie loss.
- Start with a limit order. Naming your price beats crossing a thin spread, and on one venue resting orders earn a small rebate instead of paying a fee.
- Size it like entertainment money. A 70-cent contract still loses three times in ten. Decide what a full loss costs you before you click.
The step-by-step trading guide in the section above goes deeper on order types, exits, and reading an order book, and the settlement guide covers what happens after the market closes.
Are Prediction Markets Legal in the US?
Yes at the federal level, contested in some states. CFTC-regulated exchanges operate under federal commodities law, which is why they can offer event contracts nationwide in a way state-licensed sportsbooks cannot. A wave of state regulators has pushed back, mainly over sports event contracts, and the courts are splitting: the Third Circuit affirmed Kalshi’s New Jersey preliminary injunction in April 2026, treating sports event contracts as likely swaps under exclusive CFTC jurisdiction, while the Southern District of New York declined to shield those same contracts from New York gambling law on July 7, 2026. The federal government has also sued to stop one state from applying its gambling laws to CFTC-registered exchanges.
The result is a map that changes month to month. We keep prose like this qualitative on purpose and point to a maintained tracker for specifics: CBS Sports runs a 50-state status page, the CFTC publishes the federal side, and each app’s own eligibility screen is the final authority on whether you can trade where you stand.
Kalshi founded by Tarek Mansour and Luana Lopes Lara
Polymarket launches publicly as a crypto prediction market (founder Shayne Coplan)
CFTC designates Kalshi as a contract market (DCM) – the first exchange built for event contracts
Trading platform launches
CFTC settlement: $1.4M penalty for unregistered markets; ordered to block US users
CFTC rejects Kalshi's congressional-control election contracts
Kalshi sues the CFTC over the election-contracts rejection
Federal court sides with Kalshi; US election markets go live
US presidential race drives multi-billion-dollar volume on the international platform (US-blocked era)
FBI raids founder Shayne Coplan's apartment in a probe of US-user access; no charges filed
Single-game sports event contracts launch; sports quickly becomes the dominant volume category
State cease-and-desist wave begins (Nevada, New Jersey first); litigation spreads to dozens of states
DOJ and CFTC close their investigations
Polymarket acquires CFTC-licensed exchange and clearinghouse QCEX for $112M – the foundation of its regulated US return
Intercontinental Exchange (NYSE parent) invests $2B (~$9B valuation)
Polymarket US rulebook filed with the CFTC
Polymarket US exchange launches (invite/beta phase began 2025-11-12)
Enhanced market-integrity rules published across both the international platform and the US exchange; ICE-led $600M follow-on (~$15B valuation) the same month
Third Circuit affirms Kalshi's New Jersey preliminary injunction – sports event contracts held likely 'swaps' under exclusive CFTC jurisdiction
US waitlist dropped; native iOS app launches to all eligible US users
Michigan's 30th Circuit (Judge Aquilina) issues a TRO against Kalshi's sports contracts as illegal sports betting; an extended order later sets an August 12, 2026 geofencing deadline backed by $500,000-per-day fines
Current Polymarket US fee schedule takes effect exchange-wide (taker fees + maker rebates)
S.D.N.Y. declines to shield Kalshi's sports contracts from New York gambling law – its most significant courtroom defeat to date
Current fee schedule update takes effect
Federal judge blocks Minnesota's first-in-the-nation felony ban days before its August 1 effective date; Kalshi, Polymarket, and the CFTC are co-plaintiffs found likely to succeed on federal preemption
Federal judge blocks Minnesota's felony prediction-market ban before its August 1 effective date; Polymarket is a co-plaintiff with Kalshi and the CFTC, found likely to succeed on federal preemption
New York's attorney general sues Kalshi in state court seeking roughly $36 billion – the largest state action to date
Every event above is source-linked in our platform facts ledger. Navy entries are Kalshi; green entries are Polymarket.
Prediction Markets vs. Sports Betting
The core difference is who you trade against. At a sportsbook you bet against the house at odds the house sets, with its margin built into the price. On a prediction market you trade against other people at a price the order book sets, and the venue charges a fee instead of shading the odds. Exchanges also let you exit early by selling your position, where a sportsbook bet is usually locked until settlement or a cash-out offer.
- Regulation: sportsbooks are licensed state by state; event-contract exchanges are CFTC-regulated federally
- Pricing: bookmaker odds carry vig; exchange prices are peer-set with explicit fees
- Positions: exchange positions can be sold before the event settles; sportsbook bets generally cannot
- Menu: sportsbooks go deep on sports props; exchanges range across politics, economics, weather, culture, and sports
Which model is safer for the person holding the ticket is its own question, and we keep a full piece on it: are prediction markets safer than sportsbooks, or more dangerous? For a regulated middle path, one operator runs a sports-betting exchange inside the state-licensed system; our Sporttrade review covers it. And if the house model is what you want, start with the sports betting guide.
Who Runs US Prediction Markets in 2026?
Two incumbents anchor the field. Kalshi has operated as a CFTC-designated exchange since 2020 and carries the deepest US sports event-contract menu. Polymarket returned to the US by acquiring a CFTC-licensed exchange and clearinghouse in 2025 and opening its US venue that December; it leans politics and world events. We hold both to the same sourced facts ledger, and neither carries a score anywhere on this site: prediction-market platforms get regulator-status badges, not ratings.
Kalshi
CFTC-Regulated US Exchange (DCM)
Polymarket US
CFTC-Regulated US Exchange (DCM + DCO via QCX)
Around them, 2026 brought a brand wave: DraftKings and FanDuel launched their own CFTC-framework prediction products, sports-native exchanges ProphetX and Novig won their federal designations in June 2026, Crypto.com and Robinhood carry event-contract surfaces, and PredictIt, the academic political market, keeps operating under a nonprofit consortium. The moving roster is its own story, and we track it in the platforms worth watching this year.
What Prediction Market Trading Costs
Both incumbent venues now charge formula-based taker fees that scale with how uncertain a contract is: fees peak on coin-flip prices and shrink near the extremes. Per the venues’ published schedules, a 100-contract taker order at 50 cents costs $1.75 in fees on Kalshi and $1.50 on Polymarket US, and Polymarket pays a small rebate to resting maker orders instead of charging them (fee facts verified against both schedules August 17, 2026).
Deposits are free on the main rails at both venues, and neither charges to withdraw on standard methods, so the trading fee is the cost that matters. The flagship comparison up top carries the full fee matrix, worked examples, and an interactive calculator that computes both venues’ fees on any trade you type in.
How Are Prediction Market Winnings Taxed?
Unsettled, honestly. As of July 2026 the IRS has not issued guidance on how prediction-market gains should be characterized, and practitioners see at least three candidate treatments: gambling income, capital gains, or Section 1256 contracts, each with different rates and loss rules (CNBC covered the open question in July 2026). What is not unsettled: gains are taxable income, and platforms do not always issue tax forms, so the reporting obligation sits with you.
Keep a contemporaneous log of deposits, trades, and withdrawals, and talk to a tax professional about your situation. This page is descriptive, not tax advice.
Common Mistakes New Traders Make
Event contracts look simple, and the mechanics are. The recurring losses come from a short list of habits, all avoidable.
- Crossing thin spreads. On a quiet market the gap between the best bid and ask can be several cents; a market order pays all of it. Limit orders exist for exactly this.
- Ignoring fees at coin-flip prices. Taker fees peak at 50 cents on both big venues, so the toss-up trades are the most expensive ones to churn.
- Reading a price as a promise. An 80-cent contract is a market-implied 80 percent chance, not a lock. One loss in five is the expected experience, not a malfunction.
- Skipping the resolution rules. Markets settle against a named source by a stated deadline. Traders who assume the spirit of the question rather than its letter fund the ones who read it.
- Treating it as a system. Nothing on this page is a way to beat the market; prices already carry the crowd’s information. Trade what you can afford to lose, full stop.
Which Platform Fits You?
Answer five quick questions and the guide below points you toward the venue whose verified facts match how you trade. It leans on our facts ledgers, not scores, and either answer is a reasonable one.
Tap one answer per question. Once all five are set, we point you to the venue whose published facts best match how you plan to trade.
Fit guide built on each venue's published platform facts, verified August 17, 2026. Not financial advice. 21+.
Prediction Markets FAQ
The questions readers actually ask about event contracts, answered from the same sourced facts as the rest of this page.
What is a prediction market in simple terms?
It is an exchange where people buy and sell yes/no contracts on real-world events. Each contract pays $1 if the event happens and $0 if it does not, so the price you pay doubles as the market’s probability estimate: 25 cents means roughly a 25 percent chance, as the market sees it.
Are event contracts gambling or investing?
Legally in the US they are neither casino gambling nor securities: they are derivatives regulated by the CFTC, the federal commodities regulator. Functionally they sit in between, which is exactly why several states are fighting about them in court. Treat the money at risk the way you would treat any betting bankroll.
Are prediction markets legal in my state?
The exchanges operate nationwide under federal CFTC regulation, but a handful of states contest that, especially for sports contracts, and access shifts with ongoing litigation. The app’s own eligibility screen is the final word for your state, and a maintained 50-state tracker is linked in the legality section above.
How is a prediction market different from a sportsbook?
You trade against other people instead of betting against the house. Prices come from the order book rather than a bookmaker’s line, fees are explicit instead of baked into the odds, and you can usually sell your position before the event settles instead of riding the bet to the end.
What does it cost to trade on Kalshi or Polymarket?
Both charge formula-based taker fees that peak at 50-cent prices: per the published schedules, a 100-contract taker fill at 50 cents runs $1.75 on Kalshi and $1.50 on Polymarket US, which also rebates resting maker orders. Deposits and standard withdrawals are free at both.
How do prediction market winnings get taxed?
The IRS has not said yet. Practitioners argue for gambling income, capital gains, or Section 1256 treatment, and the platforms do not always send tax forms. The gains are taxable either way, so keep your own records and ask a tax professional; nothing on this page is tax advice.
What happens when a market settles?
The venue resolves the contract against its stated source, yes shares pay out at $1, no shares expire at $0, and the cash lands in your balance. Our settlement guide above walks through resolution sources, disputed outcomes, and payout timing step by step.
Can I get out of a position before the event happens?
Yes, and that is half the point of an exchange. You can sell your shares at the current price any time the market is open, locking a profit or cutting a loss without waiting for settlement. The trade-off is that thin markets can have wide spreads, so the exit price is not always kind.
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