BetOnline vs ESPN BET: where their odds disagree
Over the last 30 days, BetOnline and ESPN BET quoted the same line at prices that summed to less than 100% on 5 game-markets — a cross-book arbitrage — with an average net edge of 2.02% and a peak of 6.12%. On plain vig, BetOnline is the cheaper book of the two. Last disagreement: Sep 20, 2026.
Vig: BetOnline vs ESPN BET
| BetOnline | ESPN BET | |
|---|---|---|
| Overall overround | 4.44% | 4.55% |
| Moneyline | 3.06% | 4.12% |
| Spreads | 4.77% | 4.87% |
| Totals | 4.91% | 4.66% |
| NFL | 4.45% | 4.54% |
| MLB | 3.57% | 4.45% |
| NBA | 4.72% | 4.51% |
| NHL | 3.35% | 4.70% |
| MLS | 5.96% | — |
Disagreements by sport
| Sport | Game-markets | Avg net edge | Max net edge |
|---|---|---|---|
| MLB | 5 | 2.02% | 6.12% |
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 Francisco Giants @ Los Angeles Dodgers · MLB | moneyline | Los Angeles Dodgers @ BetOnline + San Francisco Giants @ ESPN BET | 2.51% | Sep 19, 9:20 PM ET |
| New York Yankees @ Minnesota Twins · MLB | moneyline | Minnesota Twins @ ESPN BET + New York Yankees @ BetOnline | 0.46% | Sep 15, 7:46 PM ET |
| Cincinnati Reds @ Los Angeles Dodgers · MLB | moneyline | Cincinnati Reds @ ESPN BET + Los Angeles Dodgers @ BetOnline | 6.12% | Sep 8, 10:24 PM ET |
| Minnesota Twins @ Detroit Tigers · MLB | moneyline | Detroit Tigers @ ESPN BET + Minnesota Twins @ BetOnline | 0.44% | Sep 7, 2:13 PM ET |
| Miami Marlins @ Kansas City Royals · MLB | moneyline | Kansas City Royals @ ESPN BET + Miami Marlins @ BetOnline | 0.57% | Sep 2, 7:21 PM ET |
Frequently asked questions
How often do BetOnline and ESPN BET disagree?
In the last 30 days our scanner recorded 5 game-markets where BetOnline and ESPN BET quoted the same line at prices whose implied probabilities summed to less than 100% — a cross-book arbitrage — across 5 scans. The average net edge was 2.02% and the largest 6.12%.
Which has lower vig, BetOnline or ESPN BET?
BetOnline — BetOnline measures 4.44% overall and ESPN BET measures 4.55% 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 ESPN BET disagree on most?
MLB (5 game-markets, avg 2.02%).
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