How is the payment for agents calculated?

Hi DID team i need ask some question for you:

How is the payment for agents calculated? For example, if I subscribe to the $29 Pro version, can I generate 170 different character agents?
If I share these agent links, how is the conversation duration charged? Is it based on minutes?
Regarding the $29 version, having 3 cloned voices means three per month, correct? For instance, if I clone 3 voices for agents this month, can I clone 3 new voices next month?
If I purchase the Pro package for one month and do not renew it the following month, will the agent links I created earlier become invalid?
Is there any functional difference between the API’s agents package and the studio? If I need to intervene in my own app or website, is it right to choose the API?