AgentBets Vig Index — Sportsbook Efficiency Rankings

The AgentBets Vig Index ranks US sportsbooks by pricing efficiency across dozens of sports, updated 3x daily. Every percentage point of vig is money off the table — for human bettors and autonomous agents alike.

This page summarizes vig rankings in one place. For game-by-game odds, best lines, and pairwise book comparisons, explore the full odds comparison hub or start from the Odds & Rankings directory.

Not sure which sportsbook is right for you? Our Sportsbook Selector recommends the best book for your skill level, bet size, and sport — powered by the live data below.

Start Here

• Full methodology: Vig Index Methodology documents every formula, threshold, and design decision behind these rankings.
• Learn the math: How to Calculate Vig explains overround, implied probability, and the exact formula behind these rankings.
• Find the best lines faster: Best Sportsbook Odds by Sport and the full Comparisons hub turn these rankings into book-by-book decisions.
• Shop lower-juice books: Reduced Juice Sportsbooks and Vig Shopping Strategy show how to use the rankings in practice.
• Pick the right book type: Use the Offshore Sportsbooks hub, Regulated Sportsbooks hub, and Sportsbook API hub to decide where these prices are actually actionable.

Overall Sportsbook Rankings

Dive deeper: Browse all sportsbook odds pages for game-level data, or see the full vig breakdown by sport and market.

What the Grades Mean

The grading scale maps average overround to a letter grade. For reference, a standard -110/-110 two-way line equals 4.76% vig — that’s a B.

For the full grading methodology, formulas, worked examples, and known limitations, see the Vig Index Methodology.

Rankings by Sport

Vig varies significantly by sport. A book with sharp NFL lines might gouge you on NBA totals. These per-sport breakdowns show where each book actually competes.

NFL

NBA

MLB

NHL

NCAAF

NCAAB

Soccer (EPL)

Soccer uses a 3-way moneyline (Home/Draw/Away), so the vig calculation includes all three outcomes. Overround is typically higher than 2-way markets.

MMA

MMA only tracks moneyline — no spreads or totals. Sample sizes are smaller due to fewer events.

State of Origin

NRL State of Origin is a niche market for US-facing sportsbooks — vig can vary significantly between books. Sample sizes are small and coverage varies by book.

Bookmakers Tracked

The index dynamically discovers all bookmakers available through The Odds API across the us and us2 regions. This typically includes:

US Regulated: DraftKings, FanDuel, BetMGM, Caesars, BetRivers, Fanatics, ESPN BET, Hard Rock Bet, and more.

Offshore / Sharp: Bovada, BetOnline.ag, MyBookie, BetUS, LowVig.ag, BetAnySports, Pinnacle, and more.

Not every book offers odds on every event. The Events column tells you how much data backs each grade. A book graded on 50 events is less reliable than one graded on 500.

How We Calculate Vig

The pipeline:

Real odds from all discovered books across all in-season sports (moneyline, spread, totals)
    ↓
Convert American odds → implied probabilities
    ↓
Sum implied probabilities per event per book
    ↓
Overround = sum - 1.0  (e.g., 1.0476 - 1.0 = 4.76% vig)
    ↓
Average overround across all events → per-book grade

Data flows from The Odds API through a Cloudflare Worker cron that runs 3x daily. Sports, books, and markets are discovered dynamically — no hardcoded lists. When a new sport comes in season or a new book appears on The Odds API, pages update automatically.

For the complete technical methodology — including formulas, code references, verification examples, and known limitations — see the Vig Index Methodology. For how the word vigorish traveled from Russian gambling halls to American sportsbooks, see The Vigorish: A Linguistic Journey.

Why Agents Care About Vig

For a human bettor, vig is a drag on long-term profitability. For an autonomous betting agent, it’s a routing parameter.

An agent plugged into the agent betting stack can consume vig data programmatically and make execution decisions:

• Order routing — Send NFL bets to the book with the lowest NFL vig, NBA bets to a different book. Per-sport rankings make this trivial.
• Threshold gating — Refuse to execute if the target book’s current vig exceeds a threshold (e.g., skip any book graded C or worse).
• Execution cost modeling — Subtract half the overround from expected edge to get net expected value. A 2% edge on a 6% vig book nets ~-1% EV after margin.

The AgentBets Vig API exposes all of this data via simple JSON endpoints. An agent running a Cloudflare Worker can fetch per-sport rankings and route orders — all in under 100ms at the edge.

Data Freshness

Use the vig index as a daily pricing reference, not a tick-by-tick trading feed.

Explore Live Data

The Vig Index is the summary layer. Below it sits a full dynamically generated odds infrastructure with 750+ pages updated from real data.

• Odds & Rankings Hub — The single entry point for all odds comparisons, vig rankings, and sportsbook matchups
• Live Odds Hub — Browse every sport, every book, and every head-to-head matchup
• Vig Rankings Hub — Per-sport, per-market, per-book vig analysis
• Best NFL Odds — Sport-specific NFL rankings
• Best NBA Odds — Sport-specific NBA rankings
• Best MLB Odds — Sport-specific MLB rankings
• DraftKings vs FanDuel Odds — Head-to-head of the top two regulated US books

Keep Going

• Agent Betting Stack Overview — See where vig data fits in the full Layer 1-4 architecture
• Sharp Betting Strategies — Use low-vig books as a foundation for +EV betting
• Sportsbook API Integration Guides — Connect your agent to the books ranked here
• NBA vs NBL Betting Guide — Sportsbooks, bet types, odds, vig comparison, and NBL betting strategies