Prediction Markets vs Sportsbooks: Prices, Fees, Limits and Legality

If you've ever bet on a game, a sports prediction market will look familiar: pick a team, risk some money, get paid if you're right. But under the hood, almost everything is different — who sets the price, how much you pay for it, and what happens if you're good at it.

The core difference: who's on the other side

Sportsbook: the book sets the odds and takes your bet. If you win, the sportsbook pays you from its own pocket. Its business model is to price every market with a margin and manage risk — including by limiting players who win too often.

Prediction market / exchange: the platform runs an order book where users trade $1 contracts with each other. The price comes from supply and demand. The platform earns a fee and, on a pure exchange, doesn't care who wins. (Some sportsbook-run prediction apps do act as market makers — see our DraftKings Predictions review.)

Side-by-side

Worked example: the vig vs a fee

A standard NFL spread at a sportsbook is −110 on both sides. That means risking $110 to win $100. Convert to probabilities and each side is priced at 52.38% — together 104.76%. That extra 4.76% is the overround. Measured as a share of all the money staked on both sides, the sportsbook's margin (its house edge on a fair 50/50 game) is 4.55%.

On an exchange, the same game might trade at 50¢ / 51¢ for each side. Buy at 51¢ and you pay 51¢ plus a fee, so the comparison depends on the platform:^[2]

Favourites and longshots

The comparison changes with the price, because price-based exchange fees shrink at the extremes while a sportsbook's margin doesn't:

Illustrative prices; the exchange price is assumed slightly below the sportsbook's implied price, as often happens on liquid markets. Kalshi fee: 0.07 × 100 × P × (1 − P), rounded up.

So an exchange is not automatically cheaper. It wins when the fee is low (or you post a resting maker order), and the spread is tight.

Convert any line yourself with our price-to-odds converter, and see the sports side of things in our odds converter.

Where sportsbooks still win

• Promotions: sign-up bonuses and profit boosts are far bigger.
• Bet menu: same-game parlays, hundreds of props, niche leagues.
• State protections: licensed books follow state rules on responsible gambling, advertising and dispute resolution.
• Simplicity: no order books, no limit orders, no thinking about liquidity.

Where prediction markets win

• Better prices on popular markets thanks to lower margins.
• Trade out anytime — lock in profit if the price moves your way.
• No limits for sharp players.
• More states: federally regulated platforms operate where sportsbooks don't, including California, Texas and Florida — subject to ongoing court fights.^[1]
• Beyond sports: one account for elections, the economy, culture and more.

Legal differences

Sportsbooks are licensed state by state. Prediction markets rely on federal CFTC regulation, which many states dispute for sports contracts. In October 2026 sports contracts were blocked in Nevada and Michigan and litigated elsewhere. Our guide are prediction markets legal? has the full map.

Which should you use?

• Casual fan, loves parlays and boosts → a licensed sportsbook. See our best betting sites.
• Price-conscious, trades straight bets → an exchange like Novig or Kalshi.
• In a state without legal sports betting → FanDuel Predicts, DraftKings Predictions or Kalshi.
• Already winning and getting limited → a prediction market.

Plenty of people use both, and shop for the best price on each game. Start with our ranking of the best prediction markets, and play within your limits.