Queue software

Betfair don't expose information about individual orders so it's impossible to reliably work out where you are in the queue. Therefore you can only estimate where you think you could be, but even that is pretty vague. At that point somebody wipes out three ticks around your price and you are suddenly at the back of a very big queue!

but surely it should be possible to work out where you are in the queue at a given price point?

eg, if there's 1K waiting at 2.0 and I put an order in at the same price, how much there is ahead of me should be £1000 minus the amount matched at that price since the order went in?

Part matching, cancelled orders, part cancelled orders, cross matching etc. etc. Delays between traded volume data and actual etc. etc.

hmm - I see the cancelled orders thing.

but presumably that still means it's possible to show the maximum amount that can be ahead of you in the queue, as this can only remove money.

MAXIMUM correct perhaps, but you couldn't reliably say a minimum.

I wonder - how does crossmatching fit into this if somehow the odds are same for a direct bet getting take versus a cross match that comes to the same value : and how could you work that out from the graphs?

I've always been surprised there is no api call for this, it seems a pretty basic and useful piece of information about a bet.