BetOnline vs Hard Rock Bet: where their odds disagree
Over the last 30 days, BetOnline and Hard Rock Bet quoted the same line at prices that summed to less than 100% on 6 game-markets — a cross-book arbitrage — with an average net edge of 2.37% and a peak of 7.20%. On plain vig, BetOnline is the cheaper book of the two. Last disagreement: Sep 18, 2026.
Vig: BetOnline vs Hard Rock Bet
| BetOnline | Hard Rock Bet | |
|---|---|---|
| Overall overround | 4.44% | 4.65% |
| Moneyline | 3.06% | 4.21% |
| Spreads | 4.77% | 5.10% |
| Totals | 4.91% | 4.65% |
| NFL | 4.45% | 4.57% |
| MLB | 3.57% | 3.95% |
| NBA | 4.72% | — |
| NHL | 3.35% | 5.33% |
| MLS | 5.96% | — |
Disagreements by sport
| Sport | Game-markets | Avg net edge | Max net edge |
|---|---|---|---|
| MLB | 6 | 2.37% | 7.20% |
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 |
|---|---|---|---|---|
| Boston Red Sox @ Texas Rangers · MLB | moneyline | Boston Red Sox @ Hard Rock Bet + Texas Rangers @ BetOnline | 7.20% | Sep 17, 8:18 PM ET |
| Detroit Tigers @ Chicago White Sox · MLB | moneyline | Chicago White Sox @ BetOnline + Detroit Tigers @ Hard Rock Bet | 5.36% | Sep 17, 7:47 PM ET |
| Los Angeles Angels @ Washington Nationals · MLB | moneyline | Los Angeles Angels @ Hard Rock Bet + Washington Nationals @ BetOnline | 1.28% | Sep 12, 4:09 PM ET |
| Texas Rangers @ Arizona Diamondbacks · MLB | moneyline | Arizona Diamondbacks @ BetOnline + Texas Rangers @ Hard Rock Bet | 3.01% | Sep 11, 9:48 PM ET |
| Athletics @ Seattle Mariners · MLB | moneyline | Athletics @ Hard Rock Bet + Seattle Mariners @ BetOnline | 2.35% | Sep 5, 9:49 PM ET |
| St. Louis Cardinals @ Los Angeles Dodgers · MLB | moneyline | Los Angeles Dodgers @ BetOnline + St. Louis Cardinals @ Hard Rock Bet | 0.54% | Sep 1, 1:29 AM ET |
Frequently asked questions
How often do BetOnline and Hard Rock Bet disagree?
In the last 30 days our scanner recorded 6 game-markets where BetOnline and Hard Rock Bet quoted the same line at prices whose implied probabilities summed to less than 100% — a cross-book arbitrage — across 9 scans. The average net edge was 2.37% and the largest 7.20%.
Which has lower vig, BetOnline or Hard Rock Bet?
BetOnline — BetOnline measures 4.44% overall and Hard Rock Bet measures 4.65% 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 Hard Rock Bet disagree on most?
MLB (6 game-markets, avg 2.37%).
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