# Standard line vs dime line -110 / -110 -> implied sum 104.76% -> vig 4.76% -105 / -105 -> implied sum 102.44% -> vig 2.44% # Breakeven win rate drops from 52.38% to 51.22%
Halving the vig roughly halves the win rate a bettor needs to clear, which compounds enormously over volume. Low-vig books can price this tightly because they attract informed flow and move numbers fast rather than padding margins - the profile of a sharp book.
Per-book vig is directly computable from any ParlayAPI odds response (sum the implied probabilities, subtract 1), so finding the cheapest market for a given bet is a sort. The best-line view does the cross-book comparison across 45+ sportsbooks & sources.