По мотивам поста Светланы Орловской, я решил сравнить разницу между Time&Sales через CQG, которые перешли на новый протокол MDP 3.0, и старым протоколом FIX/FAST (провайдер данных - IQFeed).

Данные записывал в режиме реального времени через терминал NinjaTrader для CQG, и через IQFeed API напрямую.

В CQG тики действительно агрегированные.

Ниже представлен скриншот, на котором это хорошо видно:

 

Тоже самое озвучили в тех. поддержке IQFeed:

"As a high level summary, the change relates to how the exchange bundles trades within their messaging. Right now we are able to process each order for a trade independently. In the new protocol the exchange summarizes multiple orders under certain circumstances. For example, if you look at the current feed and see multiple trades at the same time and price (but different sizes), those will typically be bundled into a single trade going forward with MDP 3.0. So instead of multiple ticks such as 1@2084.75, 3@2084.75, 2@2084.75, 5@2084.75… you will see a single tick of 11@2084.75.

Since the middle of last year, our engineers have been trying to find ways to unbundle the data in the new protocol while still maintaining accuracy and reliability. Unfortunately we haven't found a good way to accomplish this with the data provided by the protocol. We continue to look at our data processing options in cooperation with the CME Exchange. In the mean time, we are happy to be able to continue providing our customers the accurate tick data they have come to expect.

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