BetOnline vs FanDuel: where their odds disagree
Over the last 30 days, BetOnline and FanDuel quoted the same line at prices that summed to less than 100% on 11 game-markets — a cross-book arbitrage — with an average net edge of 5.66% and a peak of 14.24%. On plain vig, BetOnline is the cheaper book of the two. Last disagreement: Sep 8, 2026.
Vig: BetOnline vs FanDuel
| BetOnline | FanDuel | |
|---|---|---|
| Overall overround | 4.44% | 4.58% |
| Moneyline | 3.06% | 4.00% |
| Spreads | 4.76% | 4.84% |
| Totals | 4.90% | 4.90% |
| NFL | 4.45% | 4.57% |
| MLB | 3.57% | 4.56% |
| NBA | 4.72% | 4.50% |
| NHL | 3.35% | 4.85% |
| MLS | 5.90% | — |
Disagreements by sport
| Sport | Game-markets | Avg net edge | Max net edge |
|---|---|---|---|
| MLB | 11 | 5.66% | 14.24% |
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 |
|---|---|---|---|---|
| Cleveland Guardians @ Baltimore Orioles · MLB | moneyline | Baltimore Orioles @ FanDuel + Cleveland Guardians @ BetOnline | 12.34% | Sep 8, 6:49 PM ET |
| Minnesota Twins @ Chicago White Sox · MLB | moneyline | Chicago White Sox @ BetOnline + Minnesota Twins @ FanDuel | 3.47% | Sep 6, 6:26 PM ET |
| Athletics @ Seattle Mariners · MLB | moneyline | Athletics @ FanDuel + Seattle Mariners @ BetOnline | 0.63% | Sep 6, 4:24 PM ET |
| Milwaukee Brewers @ Cincinnati Reds · MLB | moneyline | Cincinnati Reds @ BetOnline + Milwaukee Brewers @ FanDuel | 7.46% | Sep 4, 7:13 PM ET |
| Seattle Mariners @ Boston Red Sox · MLB | moneyline | Boston Red Sox @ BetOnline + Seattle Mariners @ FanDuel | 1.19% | Sep 2, 4:17 PM ET |
| San Diego Padres @ Cincinnati Reds · MLB | moneyline | Cincinnati Reds @ BetOnline + San Diego Padres @ FanDuel | 5.95% | Aug 31, 6:51 PM ET |
| New York Mets @ Tampa Bay Rays · MLB | moneyline | New York Mets @ FanDuel + Tampa Bay Rays @ BetOnline | 0.61% | Aug 31, 3:14 PM ET |
| Boston Red Sox @ Miami Marlins · MLB | moneyline | Boston Red Sox @ FanDuel + Miami Marlins @ BetOnline | 14.24% | Aug 26, 6:52 PM ET |
| Cleveland Guardians @ Los Angeles Angels · MLB | moneyline | Cleveland Guardians @ BetOnline + Los Angeles Angels @ FanDuel | 4.32% | Aug 25, 9:41 PM ET |
| Cincinnati Reds @ San Francisco Giants · MLB | moneyline | Cincinnati Reds @ BetOnline + San Francisco Giants @ FanDuel | 0.34% | Aug 23, 4:11 PM ET |
| Detroit Tigers @ Kansas City Royals · MLB | moneyline | Detroit Tigers @ BetOnline + Kansas City Royals @ FanDuel | 11.67% | Aug 23, 2:24 PM ET |
Frequently asked questions
How often do BetOnline and FanDuel disagree?
In the last 30 days our scanner recorded 11 game-markets where BetOnline and FanDuel quoted the same line at prices whose implied probabilities summed to less than 100% — a cross-book arbitrage — across 11 scans. The average net edge was 5.66% and the largest 14.24%.
Which has lower vig, BetOnline or FanDuel?
BetOnline — BetOnline measures 4.44% overall and FanDuel measures 4.58% 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 FanDuel disagree on most?
MLB (11 game-markets, avg 5.66%).
← all sportsbooks · BetOnline · FanDuel · what arbitrage is · dutching calculator