BetMGM vs betPARX: where their odds disagree
Over the last 30 days, BetMGM and betPARX quoted the same line at prices that summed to less than 100% on 116 game-markets — a cross-book arbitrage — with an average net edge of 3.43% and a peak of 14.52%. On plain vig, BetMGM is the cheaper book of the two. Last disagreement: Sep 19, 2026.
Vig: BetMGM vs betPARX
| BetMGM | betPARX | |
|---|---|---|
| Overall overround | 4.96% | 5.24% |
| Moneyline | 4.45% | 4.76% |
| Spreads | 4.65% | 5.08% |
| Totals | 5.58% | 5.66% |
| NFL | 4.39% | 4.89% |
| MLB | 4.81% | 5.31% |
| NBA | 4.60% | 4.84% |
| NHL | 4.56% | 5.13% |
| MLS | 8.73% | 6.46% |
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 |
|---|---|---|---|---|
| San Francisco Giants @ Los Angeles Dodgers · MLB | spread 1.5 | Los Angeles Dodgers @ betPARX + San Francisco Giants @ BetMGM | 4.39% | Sep 18, 11:38 PM ET |
| New York Yankees @ Arizona Diamondbacks · MLB | spread 4.5 | Arizona Diamondbacks @ betPARX + New York Yankees @ BetMGM | 2.44% | Sep 18, 10:22 PM ET |
| Seattle Mariners @ Colorado Rockies · MLB | spread 1.5 | Colorado Rockies @ BetMGM + Seattle Mariners @ betPARX | 2.13% | Sep 18, 9:51 PM ET |
| Philadelphia Phillies @ New York Mets · MLB | spread 2.5 | New York Mets @ BetMGM + Philadelphia Phillies @ betPARX | 5.65% | Sep 18, 9:51 PM ET |
| Milwaukee Brewers @ Baltimore Orioles · MLB | spread 1.5 | Baltimore Orioles @ betPARX + Milwaukee Brewers @ BetMGM | 1.09% | Sep 18, 8:50 PM ET |
| Kansas City Royals @ Pittsburgh Pirates · MLB | moneyline | Kansas City Royals @ betPARX + Pittsburgh Pirates @ BetMGM | 3.45% | Sep 18, 8:04 PM ET |
| Chicago Cubs @ Cincinnati Reds · MLB | total 11.5 | Over @ betPARX + Under @ BetMGM | 4.25% | Sep 18, 7:48 PM ET |
| Philadelphia Phillies @ New York Mets · MLB | spread 2.5 | New York Mets @ betPARX + Philadelphia Phillies @ BetMGM | 3.90% | Sep 17, 9:34 PM ET |
| Kansas City Royals @ Houston Astros · MLB | total 6.5 | Over @ betPARX + Under @ BetMGM | 0.87% | Sep 17, 9:03 PM ET |
| Philadelphia Phillies @ New York Mets · MLB | moneyline | New York Mets @ BetMGM + Philadelphia Phillies @ betPARX | 0.51% | Sep 17, 9:03 PM ET |
| San Diego Padres @ Colorado Rockies · MLB | total 13.5 | Over @ betPARX + Under @ BetMGM | 1.08% | Sep 17, 4:59 PM ET |
| Los Angeles Dodgers @ Cincinnati Reds · MLB | total 10.5 | Over @ BetMGM + Under @ betPARX | 2.93% | Sep 17, 2:42 PM ET |
| Boston Red Sox @ Texas Rangers · MLB | spread 2.5 | Boston Red Sox @ BetMGM + Texas Rangers @ betPARX | 2.89% | Sep 16, 10:30 PM ET |
| Kansas City Royals @ Houston Astros · MLB | moneyline | Houston Astros @ BetMGM + Kansas City Royals @ betPARX | 0.96% | Sep 16, 10:00 PM ET |
| Milwaukee Brewers @ Pittsburgh Pirates · MLB | spread 1.5 | Milwaukee Brewers @ BetMGM + Pittsburgh Pirates @ betPARX | 0.57% | Sep 16, 7:59 PM ET |
Frequently asked questions
How often do BetMGM and betPARX disagree?
In the last 30 days our scanner recorded 116 game-markets where BetMGM and betPARX quoted the same line at prices whose implied probabilities summed to less than 100% — a cross-book arbitrage — across 122 scans. The average net edge was 3.43% and the largest 14.52%.
Which has lower vig, BetMGM or betPARX?
BetMGM — BetMGM measures 4.96% overall and betPARX measures 5.24% 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 betPARX disagree on most?
MLB (111 game-markets, avg 3.52%); MLS (3 game-markets, avg 2.31%); NFL (2 game-markets, avg 0.64%).
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