The gap between two books
We pair the lowest Over with the highest Under on the same game total, spread or player prop, across every book we read.
Middles finder
Two lines with a gap you can land in.
When one book has the Over at a lower number than another book's Under, a result in between wins both bets. We find those gaps and price the chance of hitting them.
What it finds
What it costs to miss
A middle loses when the result lands outside the gap, and the loss is not small: the median middle we logged cost $168.18 per $1,000 on a miss. Each row shows its cost next to what you win if it lands inside.
The chance of landing
We estimate how often the result falls in the gap from the market itself or from our model, and show which one we used.
One middle from Oct 21, 2026
From our ledgerMarketNBA game total
Over244.5 at +176, DraftKings
Under246.5 at -205, FanDuel
Wins both on245 or 246
Chance of landing3.9%
- Split $1,000 so both sides pay the same: the pair implies 36.2% + 67.2% = 103.4%.
- If the total lands outside 245 to 246, one side wins and you are down $33.30.
- If it lands on 245 or 246, both win and you are up $933.39.
- At a 3.9% chance of landing, that averages out to about +$4.27 per $1,000.
A small expected gain, paid for by losing $33.30 on most nights. That is a cheap miss: the median middle we logged cost $168.18 per $1,000. The gap closed 18 minutes and 45 seconds after we found it.
Our middles ledger, first seen 5:50 PM ET on Oct 21, 2026.
Before you bet it
- Both lines are still up at the prices on the board.
- You can afford the cost on the nights it misses. Most middles miss.
- The chance of landing comes from enough data. Check whether it is the market or our model.
- The two books are run by different operators.
Free and with the betting plan
What you seeSigned outBetting plan
How many middles are liveShownShown
The top middles, with cost and booksTop 3Every middle
Prices and exact stakesLockedShown
Chance of landing and expected valueLockedShown
From our own data
5 min
Half of the middles we logged were gone within 315 seconds of first sight, almost always because a book moved.
More than 680,000 middles logged from Jul 31 to Oct 28, 2026. Results vary.
Read the arbitrage and middles guide