How live arbitrage betting works, and why in-play arbs vanish in seconds
Live arbitrage betting means betting both sides of a game while it's being played, at two sportsbooks whose in-play odds disagree. Most live arbs come from one book updating slower than another after a score, so they last only seconds. Books hold in-play bets for a few seconds before accepting them, and a line can move in that window, so bet the stale price first. Arbocado's Arbitrage Finder has a Live mode that scans in-play markets across your books.
- Live arbitrage betting means betting both sides of an in-play game at two sportsbooks whose live odds disagree.
- Most live arbs exist because one sportsbook updates its odds slower than another after a score, so they usually last only a few seconds.
- Many sportsbooks hold in-play bets for a few seconds before accepting them, and a line move during that delay can turn a profitable arb into a small loss.
- In a live arb, bet the stale price first: if that bet is rejected you have no exposure, and the book that already updated is less likely to move again.
- Betting stale in-play lines right after a score is one of the clearest signals sportsbooks use to limit accounts.
The short answer
Live arbitrage betting means betting both sides of a game while it's being played, at two books whose in-play odds disagree. The math is the same as a pre-game arb. The timing isn't.
Live arbs usually last a few seconds. Most books also hold in-play bets for a few seconds before accepting them, and the line can move during that wait. Whether you profit depends on how fast you place both legs and which one you place first.
Why live arbs exist
Every sportsbook re-prices a game after each score, timeout, and injury. Some update in under a second. Others lag a few seconds behind, and during a run of scoring the gap between them can be large.
Say the Heat go on a 9-0 run against the Celtics in the second quarter. FanDuel updates right away and has the Celtics at -140. Most books now have the Heat around +130, but BetMGM still shows +160, its price from before the run. BetMGM's Heat price plus FanDuel's Celtics price adds up to 96.79% implied. That's a 3.31% arb, and it lasts until BetMGM catches up.
This arb exists because one book is slow. That shapes everything else about how you bet it.
Live vs. pre-game arbs
| Pre-game | Live | |
|---|---|---|
| How long an arb lasts | Minutes, sometimes longer | Seconds |
| Why the gap exists | Books price the game differently | One book updates slower than another |
| Bet acceptance | Instant at most books | Held for a few seconds first |
| Market suspensions | Rare | After scores, reviews, free throws, and injuries |
| Typical edge | 1% to 3% is common | Often larger, since prices move further |
| Maximum stake | Book's normal limit | Often lower in-play |
| Main risk | Line moves before the second bet | Second bet rejected or re-priced during the delay |
If you're new to arbs, start pre-game. How to arbitrage bet covers the basic process. Live arbs add speed on top of it.
The bet delay is the real risk
Before the game, a bet is accepted the moment you submit it. In-play, most books hold it for a few seconds first. If anything happens in that window, the book can reject the bet or come back with a new price.
Back to the Heat and Celtics with $300 to stake. You put $119.21 on the Heat at +160 at BetMGM and it goes through. That returns $309.95 if the Heat win. Then you submit $180.79 on the Celtics at -140 at FanDuel, and the bet sits in FanDuel's delay.
| During the delay | FanDuel price | Celtics stake needed | Result |
|---|---|---|---|
| Nothing happens | -140 | $180.79 | $9.93 profit |
| Celtics make a free throw | -150 | $185.97 | $4.77 profit |
| Celtics hit a 3 | -175 | $197.24 | $6.50 loss |
At -175, you have two choices. Bet $197.24 to cover the Heat leg and lock in a $6.50 loss, or leave the Heat bet open and wait for a better Celtics price. Waiting means $119.21 rides on the game until you hedge. Most arbers take the small, known loss.
Change the Celtics odds below to -150 or -175 to see each outcome. Open the full calculator to lock the Heat stake at $119.21.
A live arb before the delay
Heat +160 at BetMGM (a stale price) vs. Celtics -140 at FanDuel, with $300 total.
Guaranteed profit $9.93 (3.31%) whichever outcome wins
Bet the stale price first
In a pre-game arb, the usual advice is to bet the leg most likely to move first. In a live arb that's almost always the stale price, because it will disappear the moment the slow book catches up.
- Spot the stale side. Compare each price with other books. In the example, most books had the Heat near +130. BetMGM's +160 was the outlier, so it was the price that would vanish.
- If it gets rejected, you've lost nothing. No bet means no exposure. Skip the arb and move on.
- The fresh side is safer to chase. FanDuel's price was already current, so it's less likely to jump while you bet the second leg.
- Ignore suspended markets. If one side is suspended, its price on screen can't be bet. The arb isn't real until both markets are open.
How much time each sport gives you
Prices move when something can happen. Sports with set pauses between plays give you a window to place both legs. Continuous sports don't.
| Sport | Natural pause | What it means for live arbs |
|---|---|---|
| NFL | 40-second play clock between plays | Time to place both legs before the snap |
| MLB | 15-second pitch clock (18 with runners on) | Short windows, but steady ones |
| Tennis | 25-second serve clock between points | Prices swing on every point |
| NBA | About 200 possessions in 48 minutes of game clock | A possession every 15 seconds or so, with few pauses |
| Soccer and hockey | Play rarely stops | Fewer scores, but a goal moves the price sharply |
Basketball produces plenty of live arbs because the score changes so often. It also re-prices them away the fastest. Football and baseball give you more time per arb.
Live arbs get noticed faster
Betting a book's stale line seconds after a score is one of the clearest signals a sportsbook watches for. A few of those bets can get an account limited faster than months of pre-game arbs.
- Don't take every stale price at the same book. Spread live arbs across your accounts.
- Round stakes to whole dollars. $119.21 on an in-play moneyline stands out.
- Mix in pre-game bets and normal-sized wagers so your account doesn't only show in-play arbs.
For more on how books spot arbers, see how to avoid sportsbook limits.
Tools that keep up
You can't find live arbs by refreshing two apps. By the time you've compared prices by hand, the slow book has updated.
- Finding them. Arbocado's live arbitrage betting finder has a Live mode that scans in-play markets across the books you pick. Live arbs are on the paid Basic and Pro plans.
- Sizing them. The free arbitrage betting calculator re-sizes the second leg when its price changes. Lock the stake you already placed and type the new odds.
- Placing them. With automated arbitrage betting, Arbocado Pro fills the bet slips at DraftKings, FanDuel, BetMGM, and Caesars and re-sizes the stake the moment a line moves. You confirm each bet.
Catch live arbs before the slow book updates
Switch the Arbitrage Finder to Live to scan in-play markets across your books, with each leg sized for you.
Open the Arbitrage FinderTo compare finders and their refresh speeds, see the best arbitrage betting software. For the step-by-step basics, start with how to arbitrage bet.
Frequently asked questions
Is live arbitrage betting more profitable than pre-game?
Live arbs often have larger edges because prices move further during a game, but they're harder to complete. The second bet can be rejected or re-priced during the book's in-play delay, and in-play maximum stakes are often lower. Many arbers get steadier results from pre-game arbs and take live ones selectively.
Which leg should you bet first in a live arb?
Bet the stale price first. That's the price at the book that hasn't updated yet, and it will disappear when that book catches up. If the bet is rejected, you have no exposure. Then cover it at the book that has already moved, since its price is less likely to jump again.
What happens if the second leg of a live arb gets rejected?
You hold one unhedged bet. Re-size the second leg at the new price with an arbitrage calculator. If the arb is gone, you can lock in a small loss by covering at the worse odds, or leave the first bet open and wait for a better price, which keeps your stake exposed to the game.
Do you need software for live arbitrage betting?
Yes. Live arbs usually last a few seconds, which isn't enough time to compare odds across apps by hand. You need arbitrage betting software that scans in-play markets, and placing both legs quickly matters as much as finding them.