BetOnline vs BetRivers: where their odds disagree
Over the last 30 days, BetOnline and BetRivers 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 0.51% and a peak of 1.03%. On plain vig, BetOnline is the cheaper book of the two. Last disagreement: Sep 15, 2026.
Vig: BetOnline vs BetRivers
| BetOnline | BetRivers | |
|---|---|---|
| Overall overround | 4.44% | 5.44% |
| Moneyline | 3.06% | 4.98% |
| Spreads | 4.76% | 5.33% |
| Totals | 4.90% | 5.81% |
| NFL | 4.45% | 5.00% |
| MLB | 3.57% | 5.36% |
| NBA | 4.72% | 5.57% |
| NHL | 3.35% | 5.52% |
| MLS | 5.90% | 6.44% |
Disagreements by sport
| Sport | Game-markets | Avg net edge | Max net edge |
|---|---|---|---|
| MLB | 7 | 0.51% | 1.03% |
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 |
|---|---|---|---|---|
| San Diego Padres @ Colorado Rockies · MLB | moneyline | Colorado Rockies @ BetOnline + San Diego Padres @ BetRivers | 0.60% | Sep 15, 7:43 AM ET |
| Los Angeles Dodgers @ Cincinnati Reds · MLB | moneyline | Cincinnati Reds @ BetRivers + Los Angeles Dodgers @ BetOnline | 0.44% | Sep 13, 8:36 PM ET |
| Seattle Mariners @ Los Angeles Angels · MLB | moneyline | Los Angeles Angels @ BetRivers + Seattle Mariners @ BetOnline | 0.48% | Sep 13, 8:06 PM ET |
| Cleveland Guardians @ Minnesota Twins · MLB | moneyline | Cleveland Guardians @ BetOnline + Minnesota Twins @ BetRivers | 0.70% | Sep 12, 4:40 AM ET |
| Minnesota Twins @ Detroit Tigers · MLB | moneyline | Detroit Tigers @ BetOnline + Minnesota Twins @ BetRivers | 0.49% | Sep 9, 12:40 PM ET |
| New York Yankees @ San Diego Padres · MLB | moneyline | New York Yankees @ BetOnline + San Diego Padres @ BetRivers | 0.57% | Sep 6, 4:09 PM ET |
| Baltimore Orioles @ Athletics · MLB | moneyline | Athletics @ BetRivers + Baltimore Orioles @ BetOnline | 1.03% | Aug 28, 10:10 AM ET |
Frequently asked questions
How often do BetOnline and BetRivers disagree?
In the last 30 days our scanner recorded 7 game-markets where BetOnline and BetRivers quoted the same line at prices whose implied probabilities summed to less than 100% — a cross-book arbitrage — across 19 scans. The average net edge was 0.51% and the largest 1.03%.
Which has lower vig, BetOnline or BetRivers?
BetOnline — BetOnline measures 4.44% overall and BetRivers measures 5.44% 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 BetRivers disagree on most?
MLB (7 game-markets, avg 0.51%).
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