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