Bally Bet vs BetMGM: where their odds disagree
Over the last 30 days, Bally Bet and BetMGM quoted the same line at prices that summed to less than 100% on 29 game-markets — a cross-book arbitrage — with an average net edge of 2.24% and a peak of 11.11%. On plain vig, BetMGM is the cheaper book of the two. Last disagreement: Sep 19, 2026.
Vig: Bally Bet vs BetMGM
| Bally Bet | BetMGM | |
|---|---|---|
| Overall overround | 5.29% | 4.96% |
| Moneyline | 4.81% | 4.45% |
| Spreads | 5.14% | 4.65% |
| Totals | 5.70% | 5.58% |
| NFL | 4.89% | 4.39% |
| MLB | 5.51% | 4.81% |
| NBA | 4.84% | 4.60% |
| NHL | 5.13% | 4.56% |
| MLS | 6.48% | 8.73% |
Disagreements by sport
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 |
|---|---|---|---|---|
| Milwaukee Brewers @ Baltimore Orioles · MLB | spread 1.5 | Baltimore Orioles @ BetMGM + Milwaukee Brewers @ Bally Bet | 3.37% | Sep 18, 10:37 PM ET |
| New York Yankees @ Arizona Diamondbacks · MLB | spread 2.5 | Arizona Diamondbacks @ BetMGM + New York Yankees @ Bally Bet | 3.48% | Sep 18, 9:51 PM ET |
| Milwaukee Brewers @ Pittsburgh Pirates · MLB | spread 3.5 | Milwaukee Brewers @ Bally Bet + Pittsburgh Pirates @ BetMGM | 0.72% | Sep 17, 1:26 PM ET |
| Miami Marlins @ Arizona Diamondbacks · MLB | total 12.5 | Over @ Bally Bet + Under @ BetMGM | 0.57% | Sep 14, 11:03 PM ET |
| Chicago White Sox @ Cleveland Guardians · MLB | total 8.5 | Over @ Bally Bet + Under @ BetMGM | 0.30% | Sep 14, 8:46 PM ET |
| Cincinnati Reds @ Milwaukee Brewers · MLB | total 7.5 | Over @ Bally Bet + Under @ BetMGM | 1.57% | Sep 13, 3:02 PM ET |
| Colorado Rockies @ Detroit Tigers · MLB | total 9.5 | Over @ Bally Bet + Under @ BetMGM | 0.97% | Sep 13, 3:02 PM ET |
| Colorado Rockies @ Detroit Tigers · MLB | spread 6.5 | Colorado Rockies @ Bally Bet + Detroit Tigers @ BetMGM | 0.97% | Sep 13, 3:02 PM ET |
| Los Angeles Dodgers @ Miami Marlins · MLB | total 7.5 | Over @ Bally Bet + Under @ BetMGM | 0.55% | Sep 12, 6:57 PM ET |
| Cincinnati Reds @ Los Angeles Dodgers · MLB | spread 12.5 | Cincinnati Reds @ Bally Bet + Los Angeles Dodgers @ BetMGM | 2.66% | Sep 10, 12:37 AM ET |
| St. Louis Cardinals @ San Francisco Giants · MLB | spread 5.5 | San Francisco Giants @ BetMGM + St. Louis Cardinals @ Bally Bet | 2.47% | Sep 9, 5:47 PM ET |
| St. Louis Cardinals @ San Francisco Giants · MLB | total 7.5 | Over @ BetMGM + Under @ Bally Bet | 0.84% | Sep 9, 4:00 PM ET |
| Chicago Cubs @ Miami Marlins · MLB | total 13.5 | Over @ Bally Bet + Under @ BetMGM | 4.19% | Sep 6, 4:39 PM ET |
| Chicago Cubs @ Miami Marlins · MLB | spread 6.5 | Chicago Cubs @ Bally Bet + Miami Marlins @ BetMGM | 4.19% | Sep 6, 4:39 PM ET |
| Minnesota United FC @ Portland Timbers · MLS | total 6.5 | Over @ BetMGM + Under @ Bally Bet | 0.87% | Sep 5, 11:36 PM ET |
Frequently asked questions
How often do Bally Bet and BetMGM disagree?
In the last 30 days our scanner recorded 29 game-markets where Bally Bet and BetMGM quoted the same line at prices whose implied probabilities summed to less than 100% — a cross-book arbitrage — across 29 scans. The average net edge was 2.24% and the largest 11.11%.
Which has lower vig, Bally Bet or BetMGM?
BetMGM — Bally Bet measures 5.29% overall and BetMGM measures 4.96% 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 Bally Bet and BetMGM disagree on most?
MLB (28 game-markets, avg 2.29%); MLS (1 game-markets, avg 0.87%).
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