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When two books are showing materially different lines or prices on the same prop, it creates an opportunity. Line Gap detects three flavors of these and flags them inline on prop rows.

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The three opportunity types

ARB

True arbitrage. The sum of raw implied probabilities across both books is below 1.0 — meaning a hedged stake split is mathematically risk-free.Rare. When you see one, move fast — they don’t last.

MID

Middle opportunity. Line difference of ≥1.0 points between two books, with the right direction so both sides can hit.Bet over at the lower line and under at the higher line. Both can win on a result that lands between them.

DIFF

Line discrepancy. Two books are off by ≥0.5 points without arb or middle math, but worth checking before you place. Line shopping wins.

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How it surfaces

On the dashboard, opportunities appear as colored pills next to the player name:
  • ARB — emerald green
  • MID — cyan
  • DIFF — sky blue
Hover any badge for the full math: which two books, the line difference, and (for ARB) the percentage edge. Each tooltip also reminds you to verify lines on each book before betting — they move quickly.

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When opportunities refresh

Detection runs at the end of every poll batch (every 30 minutes). The opportunities table is wiped and rewritten per poll, so anything you see is current as of the most recent batch. If a sportsbook updates between polls (which they often do), the displayed badge may briefly lag reality. Always verify before placing.

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What we deliberately don’t claim

  • We don’t size your stake. ARB tooltips show the percentage edge but not the dollar split. That’s a calculation you do at your sportsbook, with rounding and minimum-stake constraints baked in.
  • We don’t track per-user account limits. Your DraftKings account may be limited; ours isn’t aware. If you’re hitting limit-orders, we have no signal.
  • We don’t track overlap with the bonus / boost economy. A book offering a profit boost can change the math — we don’t model that.

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Standalone arbitrage page

The /arbitrage page lists all currently-detected opportunities in a sortable table. Useful when you want to scan the whole market rather than hunt one player at a time. The dedicated page predates the badge surface. Same data source — choose whichever workflow fits your style.

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Coming soon

Account-aware detection

Not on near-term roadmapFiltering opportunities to only books you have funded accounts at would reduce noise but requires per-user book preferences we don’t track yet.