Prediction Markets vs. Sportsbooks vs. Betting With Friends

A sportsbook bet, a prediction-market contract, and a bet with your friends can all start with the same opinion — “I think this team wins” — but the machinery behind them is completely different. Who takes the other side? Where does the platform make money? Can you get out early? And what happens when you want a weird custom bet?

Last reviewed: August 18, 2026. Platform fees, market availability, and rules can change.

Three ways to make the same sports prediction

Suppose you think Team A will beat Team B. Here is what changes depending on where you place that opinion:

Question	Traditional sportsbook	Prediction market	Betting with friends / TrueBet
Who is on the other side?	The sportsbook.	Another market participant, matched through an exchange/order book.	Another member of your private group.
How does cost show up?	Margin is generally embedded in the odds — the vig/juice.	Transaction fees may apply; bid-ask spread can also affect entry/exit.	TrueBet does not deduct a fee based on the amount of each accepted wager; membership charges may apply separately.
Liquidity	Typically immediate if the book accepts your stake, subject to limits.	Depends on order-book depth and available counterparties.	Depends on someone in the group accepting the wager.
Can you exit early?	Cash-out may be offered, but pricing and availability are controlled by the book.	You may be able to sell before resolution, subject to liquidity, spread, fees, and price movement.	Accepted wagers generally remain until resolution under the platform’s rules.
What can you bet on?	Sports markets and props selected by the book.	Often sports plus politics, economics, culture, weather, and other events.	Sports wagers within your groups, including custom wagers where supported.
Social experience	Mostly bettor vs. house.	Mostly trader vs. public market.	Designed around friends, private groups, and direct counterparties.

1. Traditional sportsbooks: simple execution, built-in margin

Sportsbooks are familiar for a reason. Open the app, choose a line, enter your stake, and — if the wager is accepted — you have action. The sportsbook sets the available markets and prices and takes the other side of the bet.

The cost is usually not presented as a line-item fee. It is embedded in the odds. The classic example is -110 on both sides of an even matchup: you risk $110 to win $100. That extra pricing cushion is commonly called the vig or juice.

Sportsbook strengths

• Fast, straightforward bet placement when the market is open.
• Broad sports menus, same-game products, promos, and in-play markets at many operators.
• No need to find another individual willing to take your exact wager.

Sportsbook trade-offs

• Margin is built into the price, so the displayed odds are not the same as a no-vig fair price.
• The sportsbook controls limits, available markets, and cash-out terms.
• The experience is fundamentally bettor-versus-house, not peer-to-peer.

2. Prediction markets: trade a contract instead of placing a book bet

Prediction markets such as Kalshi and Polymarket use an exchange-style model. Instead of a book posting -110, you may see a “Yes” contract trading at $0.55. If it resolves Yes, a winning contract generally pays $1; if not, it pays $0, subject to the platform’s rules.

The contract price is set by supply and demand in the market. That creates some appealing flexibility: you may be able to buy, sell, post a resting order, or exit before the event resolves.

Prediction-market strengths

• Public markets can aggregate a large number of participants.
• Markets can cover far more than sports — including politics, economic data, culture, weather, and other events.
• An open position can often be traded before resolution if liquidity exists.
• Order-book tools can appeal to active traders who care about making vs. taking liquidity.

Prediction-market trade-offs

• Transaction fees can depend on venue, category, order type, price, and fee schedule.
• The bid-ask spread is a separate cost from the platform fee.
• Exiting early introduces price-movement and liquidity risk.
• “The contract is 55¢” is simple, but the all-in cost is not always obvious until you separate fee, spread, and exit behavior.

For example, current Polymarket documentation lists taker fees in fee-enabled categories, with makers not charged platform trading fees. Kalshi publishes formulas and market-specific multipliers. If fees are your main question, see our Polymarket fee guide and Kalshi fee guide.

3. Betting with friends: the peer-to-peer model

Betting with friends changes the counterparty completely. You are not trying to beat a house price or trade a public order book. You are making a wager directly with another person who has the opposite opinion.

TrueBet is designed to make that informal “bet you $20” experience easier to organize. Members can propose and accept wagers inside private groups, track results, and use group settlement tools instead of maintaining a spreadsheet or chasing every single payment.

Betting-with-friends strengths

• No wager-level vig on TrueBet: no fee is deducted based on the amount of an accepted member-to-member wager. Membership charges may apply separately.
• No exchange spread on the direct wager: there is no public order book between two members who have accepted the terms.
• Custom and social: the point is not just the bet; it is the group, the rivalry, and the ability to create wagers that make sense to your friends.
• Simple settlement workflow: TrueBet tracks results and produces weekly settlement information for the group.

Betting-with-friends trade-offs

• Your wager needs another group member willing to accept it. A small or inactive group can have a liquidity problem.
• You generally do not have the exchange-style ability to trade a position in and out before resolution.
• The market universe is centered on the platform’s sports and group-wagering experience, not every public event category.

What does a $100 bet look like across the three models?

There is no perfect apples-to-apples example because the products are different. But this framework helps:

Model	Start with $100 of risk/value	Primary cost question
Sportsbook	At -110, $110 is required to win $100; if you risk exactly $100, the profit is about $90.91.	How much margin is built into the odds?
Prediction market	$100 buys a price-dependent number of contracts.	What are the transaction fee, spread, and possible exit cost at this exact market price?
TrueBet / friends	Two members can agree to risk $100 to win $100 at even money.	Is there any separate membership cost, and will someone in the group accept the wager?

Which model is best for you?

A sportsbook may be the most familiar choice for someone who values immediate house liquidity and a conventional betting menu. The “best” model depends on what you value: execution speed, public-market breadth, early exit, cost structure, custom wagers, or the social experience.

The bottom line

Do not compare these platforms by asking only, “Which one has the lowest fee?” A sportsbook, an exchange, and a private peer-to-peer group solve different problems. Start with the counterparty and the pricing model. Then look at the all-in cost, liquidity, flexibility, and the experience you actually want.

Sources and further reading

• Polymarket Documentation — Fees.
• Kalshi — Official Fee Schedule.
• TrueBet Blog — How do sportsbooks make money?.
• TrueBet Blog — Peer-to-Peer (P2P) Betting Introduction.

Product availability, wagering rules, and permitted use vary by jurisdiction. Fee schedules and platform terms can change. This article is educational content, not financial or legal advice.