Sports Event Contracts: Betting Without a Sportsbook

Sports event contracts let you bet on a game without a sportsbook. You buy Yes or No on a question like "Will the Bills beat the Jets?" on a federally regulated exchange such as Kalshi, each contract pays $1.00 if your side is right, and the price in cents reads as the chance the market gives it.

Two things make a sports contract different from a sportsbook bet on the same side. You trade against other people, so there is no house setting your price or limiting you for winning. And you can sell your contract before the game ends, at whatever the market pays, which no sportsbook ticket lets you do except through a cash out offer the book prices itself.

Please note: Platforms, markets, and fees here are as of October 25, 2026, and sports contracts are not open in every state. This is general information, not legal advice; each app's own location check decides what you can trade.

Try It: Sell or Hold a Sports Contract

Set your buy price and the number of contracts, then drag the price the contract trades at later in the game. Watch what selling out pays against holding to the final whistle.

At the defaults you buy 100 Yes contracts on an underdog at 45 cents, which reads as +122. Kalshi's taker fee on that order is $1.74, so the position costs $46.74 and breaks even at 46.74% (about +114). Your team leads at halftime and Yes now trades at 75 cents.

• Sell now: 100 contracts at 75 cents is $75.00, less a $1.32 fee on the sale, for +$26.94.
• Hold and win: each contract settles at $1.00 with no fee, for +$53.26.
• Hold and lose: the contracts settle at $0.00, for −$46.74.

Holding, averaged at the 75 cent price, is worth +$28.26. Selling pays +$26.94. The gap is exactly the $1.32 sale fee: when the market price is fair, selling out costs you the exit fee, and holding costs you the swing. Drag the later price to 25 cents and the same trade sells for −$23.06. These are illustrative prices, and any contract can still win or lose.

What a Sports Event Contract Is

A sports event contract is a Yes or No claim on a game result, priced from 1 to 99 cents. The winning side settles at $1.00 and the losing side at $0.00. A Yes at 60 cents means the market gives that side about a 60% chance, the same as −150 at a sportsbook.

Every sports contract has two sides that add up to about a dollar. If "Bills win" trades at 60 cents for Yes, the No on the same question trades near 40 cents, which is the same as betting the Jets. For the full price to odds table and the math behind it, see prediction market betting explained.

What sets the price is an order book, a list of resting offers to buy and sell. A sportsbook posts one number and takes your bet. An exchange matches you with another trader, so the price you get depends on what is resting when you click.

Where You Can Trade Them

Six names cover most of the US market, and they are built three different ways:

The broker apps matter for cost. Robinhood charges its own commission of up to 1 cent per contract, and a contract it routes to Kalshi pays Kalshi's fee on top. The same Yes can cost a little more through a broker than on the exchange directly. Pick'em apps sell them too: PrizePicks lists sports contracts as Team Picks through its own CFTC registered broker, and where PrizePicks is legal maps its states.

Availability is the moving part. Nevada and Michigan courts have blocked Kalshi's sports contracts, Massachusetts has an injunction, and Missouri's attorney general told six platforms in September 2026 to stop. Are prediction markets legal? tracks the court split state by state.

The Markets on Offer

The menu has grown from game winners to most of what a sportsbook lists:

1. Game winners. "Will the Lakers beat the Suns?" The contract version of a moneyline.
2. Spreads. "Will the Knicks win by more than 4.5 points?" Each margin is its own contract, so you see several thresholds at once.
3. Totals. "Will the game go over 228.5 points?" Hockey totals on Kalshi include overtime goals unless a market says otherwise.
4. Player props. "Will he record 6+ assists?" Coverage is thinner than at a sportsbook and centers on star players, with a ladder of thresholds for each.
5. Combos. Kalshi's name for a parlay: several contracts bundled into one price. Polymarket US added parlays in August 2026.
6. Futures. Championship and award markets that trade for months. Read how one contributor uses those in how prediction markets changed futures betting.

Every market is binary. A spread or total never pushes and never pays half, because each threshold is a separate Yes or No question. That is cleaner than a sportsbook's −3 that can land on 3, but it also means you pick your exact line from the ladder instead of being handed one.

Combos deserve the same caution as any parlay. Each leg's price carries a cost, and bundling multiplies those costs together. Before you build one, run the legs through the parlay calculator and read how legs that move together are priced in same game parlays.

What a Sports Contract Costs

A sportsbook hides its margin, the vig, inside both prices. An exchange charges it out loud. Kalshi's published general taker fee, the fee for an order that fills against a resting offer right away, is:

$$\text{fee per contract} = 0.07 \times p \times (1 - p)$$

Here p is the price in dollars. The fee peaks at 1.75 cents on a 50 cent contract and shrinks toward 1 and 99 cents, and Kalshi rounds each order's total fee up to the next cent. A resting limit order, a maker order, pays nothing on most markets.

Three costs sit on top of the headline price:

• The fee on the way in. On 100 contracts at 45 cents, $1.74.
• The fee on the way out, if you sell. A sale is a second trade. Hold to settlement and the $1.00 payout carries no fee.
• The spread. The gap between the best buy and sell offers can be 1 cent on a busy NFL game and far wider on a thin prop. You pay it every time you cross it.

Put both sides of a 50 cent game through the fee and the hold works out to about 3.4%, against about 4.5% on a −110 sportsbook market. That does not make every contract cheaper than every sportsbook line. Kalshi vs sportsbook shows where the exchange wins on price and where it does not, and Polymarket vs Kalshi compares the two exchanges' fees.

Selling Before the Final

Selling out is the feature with no clean sportsbook equal. Your contract has a live price for as long as the market trades, set by other traders, so you can lock in a gain at halftime or cut a loss after an injury.

A sportsbook's cash out looks similar but works differently. The book sets the cash out price itself, and nothing forces it to match the fair value of your ticket. On an exchange, the price you sell at is the best bid another trader is offering, and you can rest your own sell order and wait for a better one.

The widget above shows the trade off. When the later price is a fair read of the chance, holding and selling have the same long run value, minus the exit fee for selling. So sell when you have a reason:

• You need the money back for a better price somewhere else.
• Your read changed. The starter left, or the weather turned, and you now think the price is too high.
• The position is too big for your bankroll, and locking part of it in keeps your sizing on plan. Our bankroll management guide covers how big is too big.

Selling because you are nervous, with no new information, costs you the fee and the spread for nothing.

How a Game Contract Settles

A sports contract settles on the official result from a source list in the market's rules, led by the league itself. Kalshi's NBA rules, for example, list the NBA first, then the Associated Press and other outlets.

Postponements are where contracts and sportsbooks part ways. A sportsbook usually voids a bet on a game that is not played on schedule. Kalshi's filed rules for basketball and hockey keep a market open through a delay of up to 48 hours. Past that window, or when a game is abandoned before it counts, the contract can settle at the exchange's last fair price rather than refunding you.

A game called after enough play to be official settles on the score, just as the league records it. The details differ by sport and by market, so open the rules tab on any contract you plan to hold through a weather threat or a doubleheader.

Sports Contract vs Sportsbook Bet

The "no limits" row is the one sharp bettors care about most. A sportsbook can cut the stake on a winning account to a few dollars, which how to avoid betting limits covers. An exchange has no reason to, because it earns the same fee whichever trader wins. Your real ceiling is how much size is resting in the order book.

How to Price One Before You Trade

A contract is a good buy when it costs less than the side's real chance. Sportsbooks are still the best place to estimate that chance, so check the contract against them:

1. Convert the contract and add the fee. The prediction market converter turns cents into odds and shows the price after Kalshi's taker fee. Our Kalshi odds converter explains each step.
2. Devig a sharp sportsbook's line to strip its margin and get a fair chance. The devigging guide shows the methods, and the devigging calculator runs them.
3. Compare the two. If the contract costs 52 cents all in and the fair chance is 55%, the contract is underpriced by 3 points. If the fair chance is 50%, look at the No side or the sportsbook instead.

On thin markets a straight devig can mislead, which finding fair value on prediction markets works through. And when a contract and a sportsbook line disagree enough that taking both sides returns more than you stake whichever side wins, that is an arbitrage opportunity. Fills, fees, and moving prices mean no arb is ever certain until both sides are filled.

Following the Sharp Wallets

Polymarket settles on a public blockchain, so every wallet's sports trades are on the record. SmartStake Insiders turns that record into a feed of Picks from wallets that pass a daily audit: at least 200 sports markets traded, a directional return of at least 1% with arbitrage excluded, and activity in the last 30 days.

That is the exchange version of reading sharp money. The Insiders walkthrough shows how to read a Pick and the price it lists. Insiders is part of Premium in the SmartStake app. A strong record is a signal, not a promise, and any wallet can be wrong on the next game.

Frequently Asked Questions

What are sports event contracts? Sports event contracts are Yes or No contracts on the result of a game, traded on a federally regulated exchange instead of placed with a sportsbook. Each contract pays $1.00 if its side is right and $0.00 if it is wrong, so its price in cents reads as the market's chance. You buy from and sell to other traders, and you can sell before the game ends.

Where can I trade sports event contracts? Kalshi is the largest venue for sports event contracts in the US. Polymarket US, Robinhood, Crypto.com, FanDuel Predicts, and DraftKings Predictions also list them, some through their own exchange and some through a partner's. Sports contracts are not open in every state, and FanDuel Predicts and DraftKings Predictions focus on states without a legal sportsbook, so each app's own location check decides what you can trade.

Are sports event contracts the same as sports betting? Sports event contracts carry the same risk as a bet, because you can lose what you pay. The legal form is different: the exchanges treat a sports contract as a swap regulated by the CFTC, while several states say it is sports betting that needs a state license. Courts have split on that question, so availability can change. This is general information, not legal advice.

Can I sell a sports event contract before the game ends? Yes. A sports event contract trades until the market closes, so you can sell it to another trader at the current price before the final whistle. On Kalshi, the sale is a second trade with its own taker fee, while a contract you hold to settlement pays the full $1.00 with no fee. Selling locks in a result, and holding keeps the full win or loss open.

What happens to a sports event contract if the game is postponed? A postponed game does not simply void the contract the way a sportsbook often voids a bet. Kalshi's filed rules keep a market open through a short delay, and when a game is delayed past the rule's window or abandoned, the contract can settle at the exchange's last fair price. Each market's rules page states its own terms, so read it before you trade.

What fees do sports event contracts charge? Kalshi charges a taker fee of 0.07 times the price times 1 minus the price per contract, rounded up to the next cent on each order. That is 1.75 cents on a 50 cent contract and less toward either end. Selling early is a second fee; settlement is free. Polymarket US and the broker apps publish their own schedules, and the bid and ask spread adds to the cost on any venue.

Trade the Price, Not the Platform

A sports event contract is a bet with the plumbing showing: a posted fee, a live price you can sell into, and no house limiting you for winning. Price it the way you price any bet, against a devigged sportsbook line, and the platform matters less than the number.

Start with the prediction market converter, then follow qualified on chain wallets in the SmartStake app.