betPARX vs Fliff: where their odds disagree
Over the last 30 days, betPARX and Fliff quoted the same line at prices that summed to less than 100% on 40 game-markets — a cross-book arbitrage — with an average net edge of 3.71% and a peak of 13.04%. On plain vig, betPARX is the cheaper book of the two. Last disagreement: Sep 19, 2026.
Vig: betPARX vs Fliff
| betPARX | Fliff | |
|---|---|---|
| Overall overround | 5.24% | 6.23% |
| Moneyline | 4.76% | 5.61% |
| Spreads | 5.08% | 6.49% |
| Totals | 5.66% | 6.50% |
| NFL | 4.89% | 6.07% |
| MLB | 5.31% | 6.13% |
| NBA | 4.84% | — |
| NHL | 5.13% | — |
| MLS | 6.46% | 9.87% |
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 |
|---|---|---|---|---|
| Detroit Tigers @ Chicago White Sox · MLB | moneyline | Chicago White Sox @ betPARX + Detroit Tigers @ Fliff | 1.55% | Sep 18, 10:37 PM ET |
| Milwaukee Brewers @ Baltimore Orioles · MLB | total 12.5 | Over @ betPARX + Under @ Fliff | 9.22% | Sep 18, 10:37 PM ET |
| Boston Red Sox @ Tampa Bay Rays · MLB | spread 2.5 | Boston Red Sox @ Fliff + Tampa Bay Rays @ betPARX | 12.71% | Sep 18, 9:51 PM ET |
| Boston Red Sox @ Tampa Bay Rays · MLB | total 5.5 | Over @ betPARX + Under @ Fliff | 13.04% | Sep 18, 9:51 PM ET |
| Philadelphia Phillies @ New York Mets · MLB | total 9.5 | Over @ betPARX + Under @ Fliff | 1.38% | Sep 18, 9:36 PM ET |
| Detroit Tigers @ Chicago White Sox · MLB | spread 5.5 | Chicago White Sox @ betPARX + Detroit Tigers @ Fliff | 5.31% | Sep 18, 8:50 PM ET |
| Kansas City Royals @ Pittsburgh Pirates · MLB | spread 1.5 | Kansas City Royals @ betPARX + Pittsburgh Pirates @ Fliff | 0.66% | Sep 18, 8:19 PM ET |
| Minnesota Twins @ Los Angeles Angels · MLB | moneyline | Los Angeles Angels @ betPARX + Minnesota Twins @ Fliff | 0.43% | Sep 18, 12:37 AM ET |
| Boston Red Sox @ Texas Rangers · MLB | moneyline | Boston Red Sox @ Fliff + Texas Rangers @ betPARX | 0.98% | Sep 17, 11:20 PM ET |
| Boston Red Sox @ Texas Rangers · MLB | total 8.5 | Over @ betPARX + Under @ Fliff | 3.51% | Sep 17, 11:05 PM ET |
| Los Angeles Dodgers @ Cincinnati Reds · MLB | spread 6.5 | Cincinnati Reds @ betPARX + Los Angeles Dodgers @ Fliff | 3.29% | Sep 17, 2:42 PM ET |
| Houston Astros @ Tampa Bay Rays · MLB | total 14.5 | Over @ betPARX + Under @ Fliff | 1.08% | Sep 13, 3:17 PM ET |
| Atlanta Falcons @ Pittsburgh Steelers · NFL | moneyline | Atlanta Falcons @ betPARX + Pittsburgh Steelers @ Fliff | 1.96% | Sep 13, 3:02 PM ET |
| San Diego Padres @ San Francisco Giants · MLB | total 14.5 | Over @ Fliff + Under @ betPARX | 0.94% | Sep 12, 6:42 PM ET |
| New England Patriots @ Seattle Seahawks · NFL | moneyline | New England Patriots @ Fliff + Seattle Seahawks @ betPARX | 1.05% | Sep 9, 10:06 PM ET |
Frequently asked questions
How often do betPARX and Fliff disagree?
In the last 30 days our scanner recorded 40 game-markets where betPARX and Fliff quoted the same line at prices whose implied probabilities summed to less than 100% — a cross-book arbitrage — across 41 scans. The average net edge was 3.71% and the largest 13.04%.
Which has lower vig, betPARX or Fliff?
betPARX — betPARX measures 5.24% overall and Fliff measures 6.23% 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 Fliff disagree on most?
MLB (34 game-markets, avg 3.99%); MLS (4 game-markets, avg 3.27%); NFL (2 game-markets, avg 1.11%).
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