isn: margins and market data
Across 4,268 markets observed in the last 7 days (7 sports, 75 leagues), isn's median bookmaker margin was 4.59% — rank #9 of 124 tracked books (lower is better for bettors). Where at least five books priced the same market, isn had the single best price 14.4% of the time.
| Market family | Median margin |
|---|---|
| Moneyline / match result | 6.07% |
| Handicaps / spreads | 4.30% |
| Totals | 4.07% |
The margin is the bookmaker's built-in fee: the amount by which its implied probabilities exceed 100%. A 4.59% margin means that, on a typical isn market, prices pay out 4.59% less than a fair-value book would. Omenizer's fair prices remove this margin using sharp reference sources — the methodology explains how.
See where isn beats fair value — free account