You can use Network Intelligence Service (NIS) for free after you activate NIS by using your Alibaba Cloud account that passes real-time verification.
If you want to use the intra-region traffic analysis capability of NIS, you must enable the virtual private cloud (VPC) flow log feature. You are charged for VPC flow logs. For more information, see Billing of flow logs.
For more information about real-name verification, see FAQ about real-name registration on the Alibaba Cloud international site (alibabacloud.com).