BetMGM vs BetUS: where their odds disagree
Over the last 30 days, BetMGM and BetUS quoted the same line at prices that summed to less than 100% on 12 game-markets — a cross-book arbitrage — with an average net edge of 2.44% and a peak of 7.18%. On plain vig, BetUS is the cheaper book of the two. Last disagreement: Sep 17, 2026.
Vig: BetMGM vs BetUS
| BetMGM | BetUS | |
|---|---|---|
| Overall overround | 4.96% | 4.64% |
| Moneyline | 4.45% | 3.31% |
| Spreads | 4.65% | 4.71% |
| Totals | 5.58% | 4.84% |
| NFL | 4.39% | 4.65% |
| MLB | 4.81% | 3.66% |
| NBA | 4.60% | — |
| NHL | 4.56% | 4.20% |
| MLS | 8.73% | 6.52% |
Disagreements by sport
| Sport | Game-markets | Avg net edge | Max net edge |
|---|---|---|---|
| MLB | 12 | 2.44% | 7.18% |
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 @ BetMGM + San Diego Padres @ BetUS | 0.94% | Sep 16, 8:44 PM ET |
| Boston Red Sox @ Texas Rangers · MLB | spread 1.5 | Boston Red Sox @ BetMGM + Texas Rangers @ BetUS | 0.33% | Sep 15, 8:16 PM ET |
| Miami Marlins @ Arizona Diamondbacks · MLB | moneyline | Arizona Diamondbacks @ BetUS + Miami Marlins @ BetMGM | 0.87% | Sep 14, 9:47 PM ET |
| Seattle Mariners @ Athletics · MLB | moneyline | Athletics @ BetUS + Seattle Mariners @ BetMGM | 2.48% | Sep 13, 4:18 PM ET |
| Cincinnati Reds @ Milwaukee Brewers · MLB | moneyline | Cincinnati Reds @ BetMGM + Milwaukee Brewers @ BetUS | 0.63% | Sep 12, 7:12 PM ET |
| Colorado Rockies @ Detroit Tigers · MLB | spread 1.5 | Colorado Rockies @ BetMGM + Detroit Tigers @ BetUS | 1.93% | Sep 12, 1:21 PM ET |
| Texas Rangers @ Seattle Mariners · MLB | moneyline | Seattle Mariners @ BetMGM + Texas Rangers @ BetUS | 7.18% | Sep 8, 9:53 PM ET |
| Los Angeles Angels @ Pittsburgh Pirates · MLB | moneyline | Los Angeles Angels @ BetMGM + Pittsburgh Pirates @ BetUS | 0.82% | Sep 5, 6:45 PM ET |
| Detroit Tigers @ Cleveland Guardians · MLB | moneyline | Cleveland Guardians @ BetMGM + Detroit Tigers @ BetUS | 5.98% | Sep 4, 3:21 PM ET |
| Chicago White Sox @ Houston Astros · MLB | moneyline | Chicago White Sox @ BetMGM + Houston Astros @ BetUS | 1.55% | Sep 3, 2:20 PM ET |
| Atlanta Braves @ Washington Nationals · MLB | moneyline | Atlanta Braves @ BetMGM + Washington Nationals @ BetUS | 3.81% | Sep 2, 1:13 PM ET |
| Washington Nationals @ Miami Marlins · MLB | moneyline | Miami Marlins @ BetUS + Washington Nationals @ BetMGM | 2.73% | Aug 23, 1:54 PM ET |
Frequently asked questions
How often do BetMGM and BetUS disagree?
In the last 30 days our scanner recorded 12 game-markets where BetMGM and BetUS quoted the same line at prices whose implied probabilities summed to less than 100% — a cross-book arbitrage — across 12 scans. The average net edge was 2.44% and the largest 7.18%.
Which has lower vig, BetMGM or BetUS?
BetUS — BetMGM measures 4.96% overall and BetUS measures 4.64% 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 BetMGM and BetUS disagree on most?
MLB (12 game-markets, avg 2.44%).
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