Prediction markets and sportsbooks both let you put money behind an outcome, and from the outside they can look like the same product wearing different labels. Under the hood they are different machines: one is a licensed bookmaker selling you odds, the other is a regulated exchange where you trade contracts with other participants. This guide covers the differences that matter in practice, pricing, costs, liquidity, and regulation, while our guide to what prediction markets are goes deeper on the mechanics.
A bookmaker vs. an exchange
The single biggest difference is who is on the other side of your money.
- A sportsbook is a bookmaker. It sets a price on every outcome, takes the other side of your bet, and earns its margin, the vig, built into the odds. The book manages risk across all the action it takes; you get the price it offers, take it or leave it.
- A prediction market is an exchange. Buyers and sellers meet on an order book and trade yes/no contracts with each other. Prices are set by supply and demand, and the platform earns fees instead of betting against you. When you take a position on a prediction market, there is no house across the table: there is another trader.
That structural difference shows up everywhere: in how prices are quoted, in what you pay to participate, in whether you can exit early, and in who regulates the whole thing.
Prices also move for different reasons. A sportsbook adjusts its odds to manage risk and balance action, so a line can move simply because too much money landed on one side. An exchange price moves when buyers and sellers update their views, a poll, an injury report, a court ruling. In both systems the number you see is a live market, not a fixed truth.
How prices are quoted: odds vs. cents
Sportsbooks and exchanges speak different price languages.
A sportsbook quotes odds in American, decimal, or fractional formats, and the implied probability of a price includes the book’s margin. A line of -150, for example, implies roughly a 60% chance, and that number already has the book’s cut baked in.
A prediction market quotes contracts. The building block is a contract that pays $1 if an event happens and $0 if it does not. Because the payoff is capped at $1, the contract trades between $0.00 and $1.00, usually shown as 0 to 100 cents, and the price doubles as a probability: a contract at 64 cents is the market saying “about 64% likely.”
Two consequences follow from that design:
- The math is simple. Buy at 64 cents and you collect $1 if you are right, 36 cents of profit on a 64-cent stake, about 56% before costs. If you are wrong, the contract settles at zero.
- The price is the probability. There is no conversion step. A sportsbook price of -150 implies a 60% chance; a contract at 60 cents implies 60%.
And the two can be mathematically equivalent as gross prices: a 60-cent contract and a -150 line both return about $1.67 per $1 staked if you are right. The difference is everything around them: the vig is inside the -150, while the exchange layers fees and spread on top. That is the next section.
One shared caveat: in both formats, the implied probability is a price, not a forecast. It includes the friction of participating, and friction is exactly where the two formats differ most.
Costs: vig vs. fees and spread
This is where the comparison gets practical, because “what does it cost to play” has different answers on each side.
At a sportsbook, the cost is the vig, also called the juice or margin: built into every price. In a typical two-way market priced -110 on both sides, the implied probabilities add up to about 104.8%, so roughly 4.8% is margin. There is usually no separate transaction fee; the price you see is the only price you pay.
At an exchange, you pay two frictions instead:
- Trading fees. They vary by platform and market, sometimes charged when you enter, sometimes when you exit, sometimes on profits. Each exchange publishes a fee schedule; read it before you trade.
- The spread. Every market has a gap between the best available buy price and the best available sell price, and crossing that gap is a cost. Liquidity decides how big it is: major games and elections trade in tight ranges, while obscure markets can be wide enough to swallow a small edge.
Two more wrinkles worth knowing. First, size behaves differently: posted sportsbook odds are the same for everyone up to the book’s limits, while on an exchange a large order can move the price you pay. Second, the honest summary: neither format is uniformly cheaper. Compare the specific market: the vig on the price you would take versus the fee plus the spread you would cross. If the cost of getting in and out is bigger than your expected edge, the trade does not make sense, however good your read on the event.
Locked in vs. tradable: how a position ends
A sports bet is a commitment. Once you take the price, you are locked into it until the event resolves, unless the book offers cash-out, which comes with its own price and terms, and usually a worse deal than the open market would give you.
A prediction market position is tradable. If the price moves your way, you can sell before the event ends and take your profit; if your view changes, you can cut the loss. That flexibility is the single biggest behavioral difference between betting and trading, and it changes how you manage money: on an exchange you are managing a position, not just waiting on a pick.
Both formats do settle mechanically in the end. Sports bets pay at the odds you took. Contracts settle at $1 or $0 according to the market’s written resolution rules, the event it tracks, the deadline, and the source used to determine the outcome. Read those rules before you trade: two contracts that sound identical can resolve differently because of a deadline or a definition, and the rules are the contract.
Regulation: state licenses vs. federal derivatives
The two formats live under different regulators, and that shapes what protections you get.
Sportsbooks in the US are licensed and supervised by state gaming regulators. That framework carries consumer protections: mandated responsible-gaming tools, complaint processes, and rules on advertising, payouts, and account handling. When a licensed book misbehaves, there is a regulator to complain to.
Prediction markets operate as federally regulated derivatives. Event contracts trade on exchanges overseen by the CFTC, the same framework that governs futures exchanges, which means registered exchanges must self-certify the contracts they list, run market surveillance, and follow federal customer-protection and anti-money-laundering rules. The CFTC also has special review authority over event contracts and has used it to scrutinize gaming-related markets, which is why sports contracts in particular attract regulatory attention.
The result is an ongoing argument over where “financial product” ends and “wager” begins. Several states have challenged the federal framework in court or passed laws restricting prediction markets, and the litigation is unresolved. The practical takeaway for you: availability depends on the platform and where you live, and the platform’s own site is the authoritative source for what you can actually trade. Our prediction markets hub tracks which platforms are live.
Beyond sports: what exchanges list
Sports contracts are the headline category, and the most contested, but prediction markets are broader than the name suggests. Regulated exchanges list contracts on politics, economic data (rate decisions, inflation, jobs reports), weather, and culture, alongside game winners and season-long awards. Each contract is defined precisely by its rules: what counts as the event happening, by when, and according to which source.
That breadth is the real product difference. A sportsbook is a sports product; an exchange is a questions market that happens to include sports. If your interest is confined to games and props, the sportsbook menu will usually be deeper. If you want to express a view on a rate cut or an election as easily as on a game, the exchange format is built for it.
What each format is good for
Neither is “better” in the abstract, they fit different habits and different questions.
- A licensed sportsbook is built for picking outcomes: simple risk-and-return bets, deep menus of games, props, and live markets, plus the consumer protections that come with a state license. If your question is “who wins, and what do I get paid,” the book format answers it directly.
- A prediction market is built for trading: taking either side of a question, sizing in and out, and covering events beyond sports. The trade-off is that you accept exchange mechanics, order books, spreads, fees, and the legal uncertainty that still surrounds the category.
One thing does not change between the two: the money is at risk, and staking discipline is what protects you. The principles in our bankroll guide apply whether you are betting or trading. And if you want to see how a licensed sportsbook looks in practice, markets, pricing, payout mechanics, our bet365 sportsbook review walks through the details.
The comparison at a glance
| Prediction markets | Sports betting | |
|---|---|---|
| Regulation | Federally regulated derivatives: contracts trade on exchanges overseen by the CFTC. | Licensed and supervised by state gaming regulators, with state consumer protections attached. |
| Pricing | Set by supply and demand on an order book; contracts trade between 0 and 100 cents, and the price doubles as a probability. | Set by the bookmaker: odds in American, decimal or fractional format, with the book’s margin built in. |
| Fees | Trading fees plus the spread between the best buy and sell prices; the total depends on the platform, market and liquidity. | The vig baked into the odds; usually no separate transaction fee on top. |
| Trading hours | Positions are tradable: you can buy or sell while the market is open, as long as a counterparty is available. | Bets lock in at the price you take until the event resolves, early exit only via cash-out, where the book offers it. |
| Settlement | Contracts settle at $1 or $0 under the market’s written resolution rules, the event, the deadline and the source. | Bets pay at the odds you took once the event resolves. |
| Minimum age | 18+ on CFTC-regulated exchanges; check the platform’s own terms. | Set by state law: 21+ in most US states, 18+ in a few. |
| Availability | Varies by platform and location; several states have challenged or restricted event contracts, check the platform’s own site. | Varies by state; offered by operators licensed in that state. |
The bottom line
Same surface, different machines: a bookmaker versus an exchange, odds versus cents, vig versus fees plus spread, locked-in bets versus tradable positions, state licensing versus federal derivatives regulation. Choose by what you want to do, pick outcomes simply, or trade probabilities across a wider world of questions, then check availability for your location, read the rules of the specific market, and understand the total cost before you commit. Size deliberately either way; that part is the same everywhere.
