If we create your newsletters, then the answer is yes.
Recently, MailChimp changed its pricing structure.
If you use the free version of MailChimp, you should still have a free account.
If you pay for MailChimp, your cost may have gone up. The number of people in your “audience” has expanded to include not only subscribers but also unsubscribed and non-subscribed contacts. You can reduce your audience by archiving contacts you no longer need.