betPARX vs BetUS: where their odds disagree
Over the last 30 days, betPARX and BetUS quoted the same line at prices that summed to less than 100% on 6 game-markets — a cross-book arbitrage — with an average net edge of 2.78% and a peak of 8.40%. On plain vig, BetUS is the cheaper book of the two. Last disagreement: Sep 18, 2026.
Vig: betPARX vs BetUS
| betPARX | BetUS | |
|---|---|---|
| Overall overround | 5.24% | 4.64% |
| Moneyline | 4.76% | 3.31% |
| Spreads | 5.08% | 4.71% |
| Totals | 5.66% | 4.84% |
| NFL | 4.89% | 4.65% |
| MLB | 5.31% | 3.66% |
| NBA | 4.84% | — |
| NHL | 5.13% | 4.20% |
| MLS | 6.46% | 6.52% |
Disagreements by sport
| Sport | Game-markets | Avg net edge | Max net edge |
|---|---|---|---|
| MLB | 6 | 2.78% | 8.40% |
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 |
|---|---|---|---|---|
| Boston Red Sox @ Tampa Bay Rays · MLB | spread 1.5 | Boston Red Sox @ betPARX + Tampa Bay Rays @ BetUS | 0.74% | Sep 18, 3:24 PM ET |
| Detroit Tigers @ Toronto Blue Jays · MLB | moneyline | Detroit Tigers @ betPARX + Toronto Blue Jays @ BetUS | 0.27% | Sep 16, 3:09 PM ET |
| Detroit Tigers @ Minnesota Twins · MLB | spread 1.5 | Detroit Tigers @ BetUS + Minnesota Twins @ betPARX | 8.40% | Sep 1, 7:53 PM ET |
| Cleveland Guardians @ Los Angeles Angels · MLB | moneyline | Cleveland Guardians @ betPARX + Los Angeles Angels @ BetUS | 2.63% | Aug 26, 4:19 PM ET |
| Cincinnati Reds @ San Francisco Giants · MLB | moneyline | Cincinnati Reds @ BetUS + San Francisco Giants @ betPARX | 1.99% | Aug 26, 3:48 PM ET |
| Boston Red Sox @ Miami Marlins · MLB | moneyline | Boston Red Sox @ betPARX + Miami Marlins @ BetUS | 2.68% | Aug 24, 6:50 PM ET |
Frequently asked questions
How often do betPARX and BetUS disagree?
In the last 30 days our scanner recorded 6 game-markets where betPARX and BetUS quoted the same line at prices whose implied probabilities summed to less than 100% — a cross-book arbitrage — across 6 scans. The average net edge was 2.78% and the largest 8.40%.
Which has lower vig, betPARX or BetUS?
BetUS — betPARX measures 5.24% 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 betPARX and BetUS disagree on most?
MLB (6 game-markets, avg 2.78%).
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