Comparisons
Best Odds Comparison Sites for NFL Line Shopping in 2026
Eight odds comparison sites for NFL line shopping, ranked on books covered, free tools and price, plus the math on why a better number matters.
Comparison
Prediction Markets vs Sportsbooks: How NFL Bets Compare
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Summary
How prediction markets and sportsbooks price an NFL bet, what each costs at -110 vs a contract price, who regulates them and where each is available.
Key takeaways
Pricing: a sportsbook sets the line and builds its margin into the odds. A prediction market lists a contract price set by buyers and sellers and charges any fee separately.
Cost: at -110 on both sides, a sportsbook keeps about 4.5% of balanced action, and a bettor needs to win 52.38% of the time to break even. On a pre-game contract bought at 50 cents with no fee, break-even is 50%.
Fees: Novig charges no fee on pre-game straight trades, ProphetX takes 2% of net winnings, and Kalshi’s standard taker fee runs up to $1.75 per 100 contracts.
Regulation: sportsbooks are licensed by each state. Prediction markets are designated contract markets regulated by the CFTC, and several states are contesting that in court.
Menus: sportsbooks still carry deeper player props, same-game parlays and in-app tools. Prediction markets cover NFL sides, totals and futures, with props and parlays varying by platform.
Prediction markets and sportsbooks: two ways to bet the same NFL game
A sportsbook and a prediction market will both take a position on the Chiefs -3. The difference is who takes the other side and how the cost reaches the bettor. At a sportsbook, the book is the counterparty and its margin sits inside the odds. On a prediction market, another user takes the other side, the platform matches the two, and its revenue comes from a posted fee, which on some trades is zero.
The split runs through the break-even rate on every bet, the regulator, the state map and the size of the menu. Sportsbooks carry more markets and better app tools, while a plain pre-game side or total usually costs less on a prediction market.
Prediction markets vs sportsbooks at a glance
Sportsbook | Prediction market | |
|---|---|---|
Who takes the other side | The sportsbook | Another user |
Who sets the price | The book’s traders | Buyers and sellers on the order book |
Price format | American odds, such as -110 | Cents per $1 contract, such as 52 cents |
Where the cost sits | Vig built into the odds | Posted fee per trade, or none |
Regulator | State gaming regulators | CFTC |
Availability | States that license online sports betting | Most states, with some blocked or in litigation |
Minimum age | 21 in most states | 18 or 21, depending on the platform |
Exit before the game ends | Cash-out, priced by the book | Sell the contract at the market price |
How a sportsbook prices an NFL bet
A sportsbook’s traders set a line and a price on each side. The standard price on an NFL spread or total is -110, which means risking $110 to win $100. Each side implies a 52.38% chance, so the two sides add up to 104.76%, and the extra 4.76 points is the vig. When the book takes $110 on each side, it collects $220, pays the winner $210 and keeps $10, about 4.5% of the money wagered.
The margin’s usually wider away from the main lines. Props, alternate spreads and live markets often price worse than -110, and the margin compounds across every leg of a parlay. The beginner’s guide to football betting walks through reading those prices.
How a prediction market prices the same bet
A prediction market lists the same game as a contract that pays $1 if the outcome happens and $0 if it doesn’t. A contract on the Chiefs -3 priced at 52 cents is the market saying 52%. That number comes from the order book: it’s the price at which one user will buy and another will sell, and it moves as orders come in.
Because the platform isn’t on either side, there’s no margin to build into the price. It charges fees instead, and the schedules differ: some charge only the user who takes an existing order (the taker), some charge a share of winnings, and some charge nothing on certain trade types. The user whose resting order gets filled (the maker) often pays nothing at all.
What a 50-50 NFL side costs on each
Take a spread both sides see as a coin flip, and a bettor who wants to win $100. At a sportsbook dealing -110, that bettor risks $110. On a prediction market at 50 cents, 200 contracts cost $100 and pay $200 if they win, before fees. The break-even win rate in each case is the cost divided by everything returned on a win, stake included.
Where the bet is placed | Cost | Profit if it wins | Break-even win rate |
|---|---|---|---|
Sportsbook at -110 | $110 | $100 | 52.38% |
Novig, pre-game straight trade | $100 | $100 | 50.00% |
Novig, live trade as taker | $101.50 | $98.50 | 50.75% |
ProphetX, 2% of net winnings | $100 | $98 | 50.51% |
Kalshi, standard taker fee | $103.50 | $96.50 | 51.75% |
The sportsbook row is just the -110 price converted: $110 to win $100 is the same as paying about 52.38 cents for a $1 contract. Novig’s live fee is 0.03 x price x (1 - price) per contract, which comes to $1.50 on 200 contracts at 50 cents. Kalshi’s standard formula peaks at $1.75 per 100 contracts at 50 cents, or $3.50 here.
The table assumes a fill at 50 cents. On a prediction market the price depends on the order book, and if the best available offer is 51 cents, break-even moves to 51% before any fee. The gap between the best buy and sell price is narrowest on heavily traded main lines and can widen on lightly traded markets.
Who regulates sportsbooks and prediction markets
Sportsbooks are licensed state by state. Each state that’s legalized online sports betting sets its own rules, taxes and licensing, and its gaming regulator, such as the New Jersey Division of Gaming Enforcement or the Pennsylvania Gaming Control Board, oversees the books operating there.
Prediction markets are regulated by the Commodity Futures Trading Commission as designated contract markets, which list event contracts under the Commodity Exchange Act. The CFTC designated KalshiEX LLC in November 2020, ProphetX on June 11, 2026, and Ludlow Exchange, LLC, which operates as Novig, on June 16, 2026. Polymarket’s US platform runs on QCEX, a designated contract market it bought in 2025 and whose designation the CFTC amended in November 2025.
Where each is available
A sportsbook can only take bets in states that license it, so availability follows each state’s law. The state-by-state list shows where online sports betting is legal.
Prediction markets argue that federal commodities law lets them operate in every state, and most of them do. Several states don’t agree. Federal appeals courts have split on whether the Commodity Exchange Act overrides state gambling law: the Third Circuit sided with Kalshi against New Jersey in April 2026, while the Ninth Circuit in a Nevada case in August 2026 and the Sixth Circuit in the Tennessee and Ohio cases in September 2026 sided with the states. Connecticut and Missouri sent cease-and-desist letters to several prediction markets in September 2026. Court orders have blocked Kalshi’s sports contracts in some states, including Nevada and Massachusetts, and Novig doesn’t currently operate in Arizona, Michigan or Nevada.
Age minimums
Sportsbooks require bettors to be 21 in most states. A few jurisdictions set the floor at 18, including New Hampshire, Rhode Island and Washington, DC. Prediction markets set their own minimums: Kalshi accepts users at 18, ProphetX’s terms require 18 or the local age of majority, whichever is higher, and Novig and Fanatics Markets require 21.
Props, parlays and live betting
The big sportsbooks carry the deepest NFL menus: long lists of player props, alternate spreads and totals, same-game parlays that mix props from one game, odds boosts and in-game cash-out. Their apps are built around those tools, and it’s the part of the comparison the books win most clearly.
Prediction markets started with sides, totals, moneylines and futures and have added to it. Novig lists moneylines, spreads, props, futures and parlays, and Kalshi offers multi-leg combos. Live trading runs during games on most of them. Prop counts are generally shorter than at a large sportsbook, and depth on any single prop depends on how many users are trading it. A prediction-market contract can also be sold to another user at the current price any time before settlement, and that price comes from the market rather than from the book’s cash-out offer.
Sportsbooks now run prediction markets too
The largest sportsbook operators now run prediction-market products under CFTC rules. FanDuel and CME Group launched FanDuel Predicts on December 22, 2025, with sports contracts offered only in states where online sports betting isn’t legal. DraftKings bought Railbird Exchange, a CFTC-designated contract market, and launched DraftKings Predictions in December 2025, also aimed at states without legal sports betting. Fanatics launched Fanatics Markets in December 2025 using contracts listed by Crypto.com | Derivatives North America, a CFTC-designated contract market, open to users 21 and older in states without legal sports betting or without Fanatics Sportsbook.
So the same brand can be a sportsbook in one state and a prediction market in the next, and the prices, fees and rules won’t match.
Which fits which bettor
Sportsbook: a bettor who wants same-game parlays, deep player props, boosts and promotions, and who lives in a state that licenses online sports betting.
Prediction market: a bettor who mostly plays NFL sides, totals and moneylines and wants the lowest cost per bet, or who lives in a state without legal online sports betting.
Both: a bettor who shops lines. A prediction market’s price on a main line and a sportsbook’s price on a prop can sit in the same weekly routine, alongside the weekly NFL odds.
Where Novig fits
Novig is the plainest example of the zero-fee version of the model. Under its published fee schedule, pre-game straight trades carry no fee for either side, so a pre-game NFL spread, total or moneyline costs the contract price and nothing else. Makers pay nothing on any trade type. Takers pay 0.03 x price x (1 - price) per contract on live NFL straight trades, 0.06 on futures and 0.10 on parlays, with the parlay fee built into the quoted price. Novig also states on its site that it doesn’t limit winning users.
Its peers charge in other ways. ProphetX takes 2% of net winnings and nothing on a losing trade. Kalshi’s standard taker fee peaks at $1.75 per 100 contracts, and Polymarket US charges takers a fee on sports contracts. Against a sportsbook’s 4.5% on a -110 spread, all of them cost less on a straight pre-game side, and Novig’s pre-game rate of zero is the lowest of the group.
Novig requires users to be 21 and doesn’t operate in Arizona, Michigan or Nevada. Prices on thinly traded markets depend on who’s posting orders, so the gap between the best buy and sell price can be wider there than on the main lines. The NFL betting sites ranking compares it against the major sportsbooks and the other prediction markets one by one.
Prediction markets vs sportsbooks FAQ
Are prediction markets legal for NFL betting?
They operate under CFTC regulation in most states, but several states are challenging them in court and federal appeals courts haven’t agreed on the question, so availability can change from state to state.
Is a prediction market cheaper than a sportsbook?
On a plain pre-game side or total, usually yes. A -110 price requires a 52.38% win rate to break even. A contract bought at 50 cents with no fee requires 50%, and the fees charged by Kalshi and ProphetX put break-even between 50.5% and 51.75% at that price.
How do contract prices convert to American odds?
A contract’s price is its implied probability. A 60-cent contract is about -150, a 40-cent contract is +150, and a 50-cent contract is even money. A -110 price works out to about 52.4 cents. The moneyline guide covers reading American prices.
Can you bet NFL player props on a prediction market?
On some. Novig lists props, and other platforms add them market by market, but the large sportsbooks still post more props per game and more same-game parlay combinations.
Can you sell an NFL contract before the game ends?
Yes. A contract can be sold to another user at the current market price any time before it settles, which locks in a gain or limits a loss.
