BetOnline vs DraftKings: where their odds disagree
Over the last 30 days, BetOnline and DraftKings quoted the same line at prices that summed to less than 100% on 8 game-markets — a cross-book arbitrage — with an average net edge of 4.64% and a peak of 13.10%. On plain vig, BetOnline is the cheaper book of the two. Last disagreement: Sep 17, 2026.
Vig: BetOnline vs DraftKings
| BetOnline | DraftKings | |
|---|---|---|
| Overall overround | 4.44% | 4.54% |
| Moneyline | 3.06% | 4.28% |
| Spreads | 4.76% | 4.66% |
| Totals | 4.90% | 4.69% |
| NFL | 4.45% | 4.57% |
| MLB | 3.57% | 4.65% |
| NBA | 4.72% | 4.58% |
| NHL | 3.35% | 4.33% |
| MLS | 5.90% | — |
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 |
|---|---|---|---|---|
| Florida Panthers @ Carolina Hurricanes · NHL | total 6.5 | Over @ BetOnline + Under @ DraftKings | 1.15% | Sep 17, 5:15 PM ET |
| Miami Marlins @ Arizona Diamondbacks · MLB | moneyline | Arizona Diamondbacks @ DraftKings + Miami Marlins @ BetOnline | 7.74% | Sep 15, 4:09 PM ET |
| Dallas Cowboys @ New York Giants · NFL | moneyline | Dallas Cowboys @ DraftKings + New York Giants @ BetOnline | 13.10% | Sep 13, 8:36 PM ET |
| Colorado Rockies @ New York Yankees · MLB | moneyline | Colorado Rockies @ DraftKings + New York Yankees @ BetOnline | 2.06% | Sep 8, 7:20 PM ET |
| Arizona Diamondbacks @ Houston Astros · MLB | moneyline | Arizona Diamondbacks @ DraftKings + Houston Astros @ BetOnline | 12.15% | Sep 6, 2:23 PM ET |
| Tampa Bay Rays @ Texas Rangers · MLB | moneyline | Tampa Bay Rays @ DraftKings + Texas Rangers @ BetOnline | 2.20% | Sep 3, 8:12 PM ET |
| Houston Astros @ New York Yankees · MLB | moneyline | Houston Astros @ DraftKings + New York Yankees @ BetOnline | 4.23% | Aug 27, 7:25 PM ET |
| Colorado Rockies @ Washington Nationals · MLB | moneyline | Colorado Rockies @ BetOnline + Washington Nationals @ DraftKings | 1.52% | Aug 24, 6:50 PM ET |
Frequently asked questions
How often do BetOnline and DraftKings disagree?
In the last 30 days our scanner recorded 8 game-markets where BetOnline and DraftKings quoted the same line at prices whose implied probabilities summed to less than 100% — a cross-book arbitrage — across 10 scans. The average net edge was 4.64% and the largest 13.10%.
Which has lower vig, BetOnline or DraftKings?
BetOnline — BetOnline measures 4.44% overall and DraftKings measures 4.54% 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 DraftKings disagree on most?
MLB (6 game-markets, avg 4.98%); NFL (1 game-markets, avg 13.10%); NHL (1 game-markets, avg 1.15%).
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