Hello @enyang,
 
There are no published limits that I'm aware of, but it is important to remember that ZAPI is a service running on the controller, and like any other service, it has a finite number of resources.  I don't know what scale your customer is dealing with, but it may be prudent to have some throttling on the client side.
 
Please reach out to me internally and I can provide a bit more info.
 
Andrew
					
				
			
			
				
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