We provide a billing summary page to show the current estimated costs for every month, you can navigate to [My Studios and Titles] page, click the […] icon that in the left of your studio row. Then click the [Billing Summary] item to jump to [Billing Summary] page. And please check this documenatation -- Billing Summary + Base Rate - PlayFab | Microsoft Docs for more explanation of the billing summary.
Besides, you can check this documentation -- Pricing Meters - PlayFab | Microsoft Docs to learn more about how PlayFab calculates the costs of the PlayStream Events. For clarification, events are metered in 1 KB blocks against average event size. For example, 10 events with an average size of 2 KB are billed as 20 events, while 10 events with an average size of 0.5 KB are billed as 10 events.
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