Calculation of 'tradedVolume'

[veeb91]

Suppose I place a bet: £2 @ 1.08 on a selection and this is the only bet placed on that selection.


The traded volume returned for that selection will be:

"tradedVolume": [
{
"price": 1.08,
"size": 4
}
]

So the traded volume size is calculated as (2 * stake) =£4 .

My question is why is it calculated like this? Surely the traded volume should be (back stake + lay liability) = (£2 + 0.16) = £2.16?

[bfexplorer]

You are so wrong.

We are on exchange, so there are two parties, one offering to back, and the one to lay. When matching on the the price/odds is available, both parties put the same stake amount (back) not lay liability, so in your case 2 stake amount was matched so 4 in response.

[veeb91]

You are so wrong.

We are on exchange, so there are two parties, one offering to back, and the one to lay. When matching on the the price/odds is available, both parties put the same stake amount (back) not lay liability, so in your case 2 stake amount was matched so 4 in response.

The reason I assumed this is because the name given is 'totalMatched'.
In the example above £2 leaves the wallet on the BACK side and £0.16 leaves the wallet on the LAY side.
So I assumed what is matched is £2.16.

Can you please explain why total match being equal to 2 * stake (in this case 2 * £2 = £4) makes more sense?

[bfexplorer]

In fact total matched is always amount of stake, not liability, so 4 = 2 + 2. You exchange your bet here, not liability.

[sonata]

In betfair exchange volume traded at 1.41 odds in match is 15000 dollars. How can we know how much is back volume and how much is lay volume from that data

[LetsGo]

No easy way, you have to calculate it yourself by tracking the previous trades.
$15,000 means that $7,500 has been matched.
You have to look at the current prices and the current amount available and compair that with the previous prices and amount available.
Bets can be placed, cancelled or matched