Betting Markets
Sportsbooks vs Prediction Markets
How prediction markets price sports outcomes, how they differ from sportsbooks, and why it's worth comparing both.
By Jared Narz · · 2 min read
A sportsbook sets a price and takes the other side of your bet. A prediction market lets users trade contracts on outcomes with each other, so prices come from buyers and sellers.
How prediction market prices work
A contract typically pays $1 if the outcome happens. If it trades at 41¢, the market is implying roughly a 41% chance. Converted, that's close to +144 in American odds, before fees.
Key differences
| Sportsbook | Prediction market | |
|---|---|---|
| Who sets the price | The book | Market participants |
| Margin | Built into the odds (the vig) | Spread between buy/sell prices and/or fees |
| Exiting early | Cash-out offers set by the book | Often sell your position at the market price |
| Limits | Can limit winning bettors | Varies by platform and liquidity |
Why compare both
The same outcome can be priced differently across sportsbooks and prediction markets. Checking both gives you more chances to find the best number. That's why the JNarz free play often lists multiple platforms, and why Live members get plays posted on Polymarket and Hard Rock.
Things to check
- Availability and rules vary by location. Confirm a platform is legal where you are.
- Liquidity: thin markets may not fill at the price you see.
- Fees: factor them into the effective price.
Examples are illustrative and use hypothetical numbers. This article is educational content, not financial advice or a guarantee of results. 21+. Bet responsibly.