Billing

You can use AS for free, but ECS instances automatically created in an AS group are billed on a pay-per-use basis. EIPs used by the instances are also billed. When the AS group scales in, the automatically created instances will be removed from the AS group and be deleted. After the deletion, these instances are no longer billed. Instances manually added are still billed after being removed from the AS group. If you do not need these instances, unsubscribe from them on the ECS console.

For example, if two instances are created when an AS group scales out, but then an hour later, the AS group scales back in, the two instances are removed from the AS group, and you will be billed for that one hour of use.