Most of the APIs and use cases are currently based on transactions on core systems, such as initiating a payment, checking a trade, etc.
Those API are able to sustains high load ; x number call per second , so it can handle so real time like API. the x being dependent to the core system.
There are some notification APIs through the Events/Messaging service as well
If you have a specific use case for real-time streaming APIs, raise it here on Community.
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