BetOnline vs Fanatics Sportsbook: where their odds disagree
Over the last 30 days, BetOnline and Fanatics Sportsbook quoted the same line at prices that summed to less than 100% on 7 game-markets — a cross-book arbitrage — with an average net edge of 2.59% and a peak of 6.43%. On plain vig, BetOnline is the cheaper book of the two. Last disagreement: Sep 17, 2026.
Vig: BetOnline vs Fanatics Sportsbook
| BetOnline | Fanatics Sportsbook | |
|---|---|---|
| Overall overround | 4.44% | 4.75% |
| Moneyline | 3.06% | 4.54% |
| Spreads | 4.77% | 4.91% |
| Totals | 4.91% | 4.79% |
| NFL | 4.45% | 4.64% |
| MLB | 3.57% | 4.88% |
| NBA | 4.72% | 4.64% |
| NHL | 3.35% | 4.73% |
| MLS | 5.96% | — |
Disagreements by sport
| Sport | Game-markets | Avg net edge | Max net edge |
|---|---|---|---|
| MLB | 7 | 2.59% | 6.43% |
How big the edges were
Share of detections by net edge bucket. Most cross-book edges are small; the tail is where the money and the execution risk both live.
Recent examples
Best detection per game-market, most recent first. These windows have closed.
| Game | Market | Legs | Net edge | Detected |
|---|---|---|---|---|
| Kansas City Royals @ Houston Astros · MLB | moneyline | Houston Astros @ Fanatics Sportsbook + Kansas City Royals @ BetOnline | 3.14% | Sep 17, 7:16 PM ET |
| Athletics @ Tampa Bay Rays · MLB | total 7.5 | Over @ Fanatics Sportsbook + Under @ BetOnline | 1.65% | Sep 17, 1:26 PM ET |
| Athletics @ Tampa Bay Rays · MLB | spread 1.5 | Athletics @ BetOnline + Tampa Bay Rays @ Fanatics Sportsbook | 2.50% | Sep 17, 1:26 PM ET |
| Kansas City Royals @ Houston Astros · MLB | moneyline | Houston Astros @ Fanatics Sportsbook + Kansas City Royals @ BetOnline | 0.34% | Sep 16, 8:14 PM ET |
| San Francisco Giants @ St. Louis Cardinals · MLB | moneyline | San Francisco Giants @ BetOnline + St. Louis Cardinals @ Fanatics Sportsbook | 6.43% | Sep 16, 1:22 PM ET |
| Chicago White Sox @ Cleveland Guardians · MLB | moneyline | Chicago White Sox @ BetOnline + Cleveland Guardians @ Fanatics Sportsbook | 2.89% | Sep 14, 6:43 PM ET |
| Seattle Mariners @ Boston Red Sox · MLB | spread 1.5 | Boston Red Sox @ BetOnline + Seattle Mariners @ Fanatics Sportsbook | 1.16% | Sep 2, 4:17 PM ET |
Frequently asked questions
How often do BetOnline and Fanatics Sportsbook disagree?
In the last 30 days our scanner recorded 7 game-markets where BetOnline and Fanatics Sportsbook quoted the same line at prices whose implied probabilities summed to less than 100% — a cross-book arbitrage — across 7 scans. The average net edge was 2.59% and the largest 6.43%.
Which has lower vig, BetOnline or Fanatics Sportsbook?
BetOnline — BetOnline measures 4.44% overall and Fanatics Sportsbook measures 4.75% over 30 days of live lines. The per-market and per-sport breakdown is in the table above.
Does this mean I can make money betting both?
Not automatically. These are measurements of past disagreements at the moment they were detected. Lines move within minutes, displayed prices may not be available at your stake, both books must be accessible in your state, and neither book has to honor a stale price. ArbMonster shows the math; the execution and the risk are yours.
Which sports do BetOnline and Fanatics Sportsbook disagree on most?
MLB (7 game-markets, avg 2.59%).
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