Catch the sportsbook that is off market on a player prop
Prop Outliers compares every book's price on the same player prop and surfaces the ones where a single sportsbook is paying at least 10% more than the market average. High conviction, fewer results, bigger edges.
- 10%+ edge threshold
- Probability-weighted average
- One-tap link to the book
How Prop Outliers works
Three steps from a full odds board to a shortlist
- 1
Average the market
Every sportsbook posting a price on a prop goes into a true probability-weighted average, so one loose book can't drag the benchmark toward itself.
- 2
Find the outlier
Each book's price is compared with that average. When the best available price beats it by 10% or more, the prop makes the board.
- 3
Size it and bet
Each row shows the outlier percentage, the best book, the market average and a quarter-Kelly stake, with a link straight to the bet slip.
A shortlist, not a firehose
Only props clearing a 10% edge make the board
What makes an outlier trustworthy
An average that reconciles
The benchmark uses every book you can see when you expand the row, so the average always matches the visible prices.
Exchanges need real liquidity
A quote on Novig, ProphetX, Polymarket or Kalshi only counts once its max bet clears a liquidity floor, so a tiny order nobody can hit never becomes the best price.
Minimum-books control
Require a minimum number of books behind the average before a prop qualifies, so thin markets don't produce phantom edges.
Your books only
Choose which sportsbooks to scan for the outlier. If you can't bet it, it isn't on your board.
Filter by sport and odds
Narrow to the leagues you follow and set a bet-size and odds range so longshots or heavy favorites don't crowd out the props you want.
Suspicious values flagged
An outlier far beyond what real mispricing produces usually means a bad line at the book. Those rows are marked so you check before betting.
Prefer a wider net? Positive EV shows every 1% edge
Prop Outliers is the high-conviction list. When you want every line beating a devigged fair price, on game lines as well as props, the Positive EV board is the broader hunt.
Frequently asked questions
What is a prop outlier?
A player prop where one sportsbook's odds are significantly better than the market average for the same line. Locktopus only lists props where the best price beats the average by 10% or more.
How is the market average calculated?
Every sportsbook posting a price on the market is converted to an implied win probability, averaged, and converted back to odds. Exchanges only count when their quote clears a small liquidity floor; regular sportsbooks are never filtered out.
How is Prop Outliers different from Positive EV?
Prop Outliers compares against the market average, covers player props only, and requires a 10% edge. Positive EV compares against a devigged fair price, covers game lines too, and lists anything with 1% or more.
Which sportsbooks does it compare?
Over 30 sportsbooks and exchanges including FanDuel, DraftKings, BetMGM, Caesars, bet365, ESPN Bet, Fanatics, Novig and ProphetX. You choose which ones to scan for the best price.
How quickly do outliers disappear?
Often within minutes. Books correct a badly priced prop as soon as they notice the action, so click through and confirm the line is still available before you place the bet.
Which plan includes Prop Outliers?
Prop Outliers is part of the Pro plan and up. Signed-out visitors and Basic subscribers see a limited preview of the board.
Related features
Positive EV
Every bet priced better than the market's fair odds, ranked by edge.
Odds Screen
Every sportsbook's price on every game line and player prop, in one table.
Arbitrage
Both sides of one market at two sportsbooks, with the stakes that lock in the profit.
See which book is off market right now
Open the live board and find the player props where one sportsbook is paying more than everyone else.