BetOnline vs betPARX: where their odds disagree
Over the last 30 days, BetOnline and betPARX quoted the same line at prices that summed to less than 100% on 16 game-markets — a cross-book arbitrage — with an average net edge of 3.61% and a peak of 9.40%. On plain vig, BetOnline is the cheaper book of the two. Last disagreement: Sep 18, 2026.
Vig: BetOnline vs betPARX
| BetOnline | betPARX | |
|---|---|---|
| Overall overround | 4.44% | 5.24% |
| Moneyline | 3.06% | 4.76% |
| Spreads | 4.76% | 5.08% |
| Totals | 4.90% | 5.66% |
| NFL | 4.45% | 4.89% |
| MLB | 3.57% | 5.31% |
| NBA | 4.72% | 4.84% |
| NHL | 3.35% | 5.13% |
| MLS | 5.90% | 6.46% |
Disagreements by sport
| Sport | Game-markets | Avg net edge | Max net edge |
|---|---|---|---|
| MLB | 16 | 3.61% | 9.40% |
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 | moneyline | Baltimore Orioles @ BetOnline + Milwaukee Brewers @ betPARX | 2.73% | Sep 18, 7:17 PM ET |
| Minnesota Twins @ Los Angeles Angels · MLB | moneyline | Los Angeles Angels @ betPARX + Minnesota Twins @ BetOnline | 1.93% | Sep 17, 5:05 AM ET |
| Houston Astros @ Tampa Bay Rays · MLB | moneyline | Houston Astros @ betPARX + Tampa Bay Rays @ BetOnline | 2.49% | Sep 13, 1:46 PM ET |
| Los Angeles Angels @ Washington Nationals · MLB | moneyline | Los Angeles Angels @ betPARX + Washington Nationals @ BetOnline | 2.79% | Sep 11, 1:53 AM ET |
| Houston Astros @ Philadelphia Phillies · MLB | moneyline | Houston Astros @ betPARX + Philadelphia Phillies @ BetOnline | 0.75% | Sep 10, 1:13 PM ET |
| Tampa Bay Rays @ Atlanta Braves · MLB | moneyline | Atlanta Braves @ betPARX + Tampa Bay Rays @ BetOnline | 1.50% | Sep 10, 12:13 PM ET |
| St. Louis Cardinals @ San Francisco Giants · MLB | moneyline | San Francisco Giants @ BetOnline + St. Louis Cardinals @ betPARX | 1.57% | Sep 8, 4:14 AM ET |
| St. Louis Cardinals @ San Francisco Giants · MLB | moneyline | San Francisco Giants @ BetOnline + St. Louis Cardinals @ betPARX | 9.19% | Sep 7, 8:20 PM ET |
| Cleveland Guardians @ Baltimore Orioles · MLB | moneyline | Baltimore Orioles @ BetOnline + Cleveland Guardians @ betPARX | 1.54% | Sep 7, 1:43 PM ET |
| Arizona Diamondbacks @ Houston Astros · MLB | moneyline | Arizona Diamondbacks @ betPARX + Houston Astros @ BetOnline | 1.60% | Sep 4, 8:14 PM ET |
| San Francisco Giants @ Pittsburgh Pirates · MLB | moneyline | Pittsburgh Pirates @ BetOnline + San Francisco Giants @ betPARX | 1.15% | Sep 3, 12:49 PM ET |
| San Francisco Giants @ Pittsburgh Pirates · MLB | moneyline | Pittsburgh Pirates @ betPARX + San Francisco Giants @ BetOnline | 7.07% | Sep 2, 6:50 PM ET |
| Kansas City Royals @ Toronto Blue Jays · MLB | moneyline | Kansas City Royals @ betPARX + Toronto Blue Jays @ BetOnline | 3.13% | Aug 26, 7:22 PM ET |
| Texas Rangers @ Chicago White Sox · MLB | moneyline | Chicago White Sox @ BetOnline + Texas Rangers @ betPARX | 9.40% | Aug 25, 7:54 PM ET |
| Cincinnati Reds @ San Francisco Giants · MLB | moneyline | Cincinnati Reds @ betPARX + San Francisco Giants @ BetOnline | 8.04% | Aug 24, 9:54 PM ET |
Frequently asked questions
How often do BetOnline and betPARX disagree?
In the last 30 days our scanner recorded 16 game-markets where BetOnline and betPARX quoted the same line at prices whose implied probabilities summed to less than 100% — a cross-book arbitrage — across 17 scans. The average net edge was 3.61% and the largest 9.40%.
Which has lower vig, BetOnline or betPARX?
BetOnline — BetOnline measures 4.44% 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 BetOnline and betPARX disagree on most?
MLB (16 game-markets, avg 3.61%).
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