Juice (also called vig or vigorish) is the sportsbook's built-in margin. A standard ATS or O/U line at −110 implies the bettor must risk $110 to win $100 — the extra $10 is juice. Across both sides of a market, the juice typically totals 4–6%. LineTerminal's ROI calculations use the actual closing odds on each bet, never an assumed −110.
Juice (Vig)
The sportsbook's commission baked into every bet, expressed as the implied edge.