BetRivers vs Fliff: where their odds disagree
Over the last 30 days, BetRivers and Fliff quoted the same line at prices that summed to less than 100% on 12 game-markets — a cross-book arbitrage — with an average net edge of 1.36% and a peak of 4.22%. On plain vig, BetRivers is the cheaper book of the two. Last disagreement: Sep 19, 2026.
Vig: BetRivers vs Fliff
| BetRivers | Fliff | |
|---|---|---|
| Overall overround | 5.44% | 6.23% |
| Moneyline | 4.98% | 5.61% |
| Spreads | 5.33% | 6.49% |
| Totals | 5.81% | 6.50% |
| NFL | 5.00% | 6.07% |
| MLB | 5.36% | 6.13% |
| NBA | 5.57% | — |
| NHL | 5.52% | — |
| MLS | 6.44% | 9.87% |
Disagreements by sport
| Sport | Game-markets | Avg net edge | Max net edge |
|---|---|---|---|
| MLB | 12 | 1.36% | 4.22% |
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 | total 14.5 | Over @ Fliff + Under @ BetRivers | 1.23% | Sep 18, 8:19 PM ET |
| Milwaukee Brewers @ Pittsburgh Pirates · MLB | moneyline | Milwaukee Brewers @ BetRivers + Pittsburgh Pirates @ Fliff | 0.61% | Sep 17, 11:55 AM ET |
| Los Angeles Dodgers @ Cincinnati Reds · MLB | moneyline | Cincinnati Reds @ Fliff + Los Angeles Dodgers @ BetRivers | 1.19% | Sep 17, 1:48 AM ET |
| San Francisco Giants @ St. Louis Cardinals · MLB | total 6.5 | Over @ BetRivers + Under @ Fliff | 1.19% | Sep 16, 3:39 PM ET |
| San Francisco Giants @ St. Louis Cardinals · MLB | spread 1.5 | San Francisco Giants @ Fliff + St. Louis Cardinals @ BetRivers | 2.88% | Sep 16, 3:39 PM ET |
| Texas Rangers @ Seattle Mariners · MLB | moneyline | Seattle Mariners @ Fliff + Texas Rangers @ BetRivers | 0.92% | Sep 10, 3:29 PM ET |
| Arizona Diamondbacks @ Kansas City Royals · MLB | total 8.5 | Over @ Fliff + Under @ BetRivers | 2.42% | Sep 9, 10:36 PM ET |
| Toronto Blue Jays @ Athletics · MLB | moneyline | Athletics @ Fliff + Toronto Blue Jays @ BetRivers | 0.54% | Sep 9, 9:21 AM ET |
| Los Angeles Angels @ Boston Red Sox · MLB | moneyline | Boston Red Sox @ BetRivers + Los Angeles Angels @ Fliff | 0.82% | Sep 9, 7:49 AM ET |
| Toronto Blue Jays @ Athletics · MLB | moneyline | Athletics @ Fliff + Toronto Blue Jays @ BetRivers | 0.42% | Sep 8, 12:25 AM ET |
| San Diego Padres @ Cincinnati Reds · MLB | total 5.5 | Over @ BetRivers + Under @ Fliff | 0.75% | Aug 31, 9:24 PM ET |
| Pittsburgh Pirates @ Los Angeles Dodgers · MLB | total 8.5 | Over @ Fliff + Under @ BetRivers | 4.22% | Aug 22, 10:06 PM ET |
Frequently asked questions
How often do BetRivers and Fliff disagree?
In the last 30 days our scanner recorded 12 game-markets where BetRivers and Fliff quoted the same line at prices whose implied probabilities summed to less than 100% — a cross-book arbitrage — across 13 scans. The average net edge was 1.36% and the largest 4.22%.
Which has lower vig, BetRivers or Fliff?
BetRivers — BetRivers measures 5.44% 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 BetRivers and Fliff disagree on most?
MLB (12 game-markets, avg 1.36%).
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