BetOnline vs Caesars: where their odds disagree
Over the last 30 days, BetOnline and Caesars quoted the same line at prices that summed to less than 100% on 4 game-markets — a cross-book arbitrage — with an average net edge of 6.03% and a peak of 13.45%. On plain vig, BetOnline is the cheaper book of the two. Last disagreement: Sep 18, 2026.
Vig: BetOnline vs Caesars
| BetOnline | Caesars | |
|---|---|---|
| Overall overround | 4.44% | 5.76% |
| Moneyline | 3.06% | 5.10% |
| Spreads | 4.77% | 6.07% |
| Totals | 4.91% | 6.14% |
| NFL | 4.45% | 6.10% |
| MLB | 3.57% | 4.15% |
| NBA | 4.72% | 4.58% |
| NHL | 3.35% | 4.67% |
| MLS | 5.96% | — |
Disagreements by sport
| Sport | Game-markets | Avg net edge | Max net edge |
|---|---|---|---|
| MLB | 4 | 6.03% | 13.45% |
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 @ Tampa Bay Rays · MLB | moneyline | Boston Red Sox @ BetOnline + Tampa Bay Rays @ Caesars | 6.04% | Sep 18, 7:17 PM ET |
| Los Angeles Dodgers @ Cincinnati Reds · MLB | moneyline | Cincinnati Reds @ Caesars + Los Angeles Dodgers @ BetOnline | 13.45% | Sep 17, 12:56 PM ET |
| Baltimore Orioles @ Colorado Rockies · MLB | moneyline | Baltimore Orioles @ Caesars + Colorado Rockies @ BetOnline | 0.27% | Sep 2, 1:59 PM ET |
| Minnesota Twins @ San Diego Padres · MLB | moneyline | Minnesota Twins @ BetOnline + San Diego Padres @ Caesars | 4.35% | Aug 22, 8:50 PM ET |
Frequently asked questions
How often do BetOnline and Caesars disagree?
In the last 30 days our scanner recorded 4 game-markets where BetOnline and Caesars quoted the same line at prices whose implied probabilities summed to less than 100% — a cross-book arbitrage — across 4 scans. The average net edge was 6.03% and the largest 13.45%.
Which has lower vig, BetOnline or Caesars?
BetOnline — BetOnline measures 4.44% overall and Caesars measures 5.76% 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 Caesars disagree on most?
MLB (4 game-markets, avg 6.03%).
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