Streaming Data API

LinusP
Posts: 1871
Joined: Mon Jul 02, 2012 10:45 pm

I assumed that if you had two streaming subscriptions with the same market and data filter you would get the same updates but I noticed the other day that sometimes the publish time would be different. Not sure if this would impact things as well or if it was a one off.
LinusP
Posts: 1871
Joined: Mon Jul 02, 2012 10:45 pm

Had another go at comparing the amount of data returned when comparing EX_ALL_OFFERS and EX_BEST_OFFERS, xitian looks as though you were correct in that when you go over about 5 ladder levels you receive a lot more data than just asking for all offers!

One horse racing market started about an hour before the start (about 10 runners, something which may impact this test):

screenshot 2.png
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xitian
Posts: 457
Joined: Fri Jul 08, 2011 2:08 pm

Thanks for the results of that analysis!

Now if only Betfair were as thorough as you are. I really can't think of a good reason why they would bother making 10 levels the default (and in particular changing it from 6 to 10). Might be worth one of us sending them your analysis to find out?

The only reason I've just thought of is that most people want many levels, but want to see virtual prices (and therefore can't use EX_ALL_OFFERS). I'd have thought needing that many levels is pretty niche though, so why not default it to 3, and let the specialists set it to 10 manually...
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