michaelg,

My betfair prices are recorded at 10-20 secs before the scheduled race start time. I collect the figures using my own program so I know the dollar amounts available at each level. If you have a winning method you should try betting it with small amounts on betfair. You can start with as little as 20c bets so a 100 unit bank will only cost you $20.

Its nothing for testing a potential winning system.