How often are market prices updated ?

[mikael]

Hi,

I would like to know how many times per second market prices can change ?
And how do you know when to make a call to listMarketBook to get the new data as quickly as possible ?

Thanks

[Lopiner]

5 times a second. You have to guess (discover) the end of the 200ms cycle and syncronize your app to request the data near the end of the matching cycle.

[mikael]

Thanks.
Are you sure about the 200ms cycle ?
I heard that it was 50ms on the previous api.

[Lopiner]

You are right, it's not 200ms, it's 20 a second, 50ms (that's why they throttle at 50ms).

[jptrader]

I'm quite sure it's 200 ms, which also is the same as in the old API. See e.g. https://api.developer.betfair.com/se...listMarketBook