No, ScriptVocalizer Agency is an Upgrade for ScriptVocalizer Standard Montly or Yearly Subscription.
Once you Upgrade your Subscription to ScriptVocalizer Agency you can use the Agency features inside your ScriptVocalizer account as long as you keep renewing your ScriptVocalizer standard Monthly or Yearly Subscription. You will not need to pay any additional fee for the Agency Features as long as your ScriptVocalizer Monthly or Yearly Subscription is active.