How much on each leg
Never the same on both sides. The stakes are split in inverse proportion to the odds, so you get the same back whoever wins.
This is where beginners lose money most often: they put the same amount on both outcomes. You can’t. If the odds are different, the amounts have to be different too, otherwise one outcome is in profit and the other in loss, and the whole “arb” is broken.
The good news: Pulse works it out for you. Still, it helps to understand the logic.
Why the split isn’t equal
The point of an arb is to get the same amount back whatever happens. The higher the odds on a leg, the less you need to put on it (it pays a lot back on its own), and the other way round.
How it looks in Pulse
In the slip, Stake split shows the finished amounts for your bankroll. With $250:
leg venue · side odds stake A Dexsport · Under 9.5 1.970 $127 B Stake · Over 9.5 2.050 $123 ────────────────────────────────────────────── Dexsport wins +$0.19 Stake wins +$2.15
Both positive, so the money is split right. Had you put $125 on each, one of the outcomes would already be negative.
The formula, if you’re curious
For two legs with odds K1 and K2, the share of the bankroll for each leg is:
stake1 = bank × (1/K1) / (1/K1 + 1/K2) stake2 = bank × (1/K2) / (1/K1 + 1/K2)
So the bankroll is split in inverse proportion to the odds, turned into probabilities.
In practice you never need to work the formula out by hand, the stake split has done it. But if a venue won’t take exactly the calculated amount, you’ll know which way to move it without breaking the arb.