Buttondown offers a variety of pricing models for paid newsletters. You can choose from the following options:
The simplest and most common pricing model is a flat rate. You set a price for your paid newsletter, and subscribers pay that amount each month or year.
If you want to offer a more flexible pricing model, you can use the "Pay what you want" model. With this model, subscribers can pay any amount they want on a recurring basis. You can specify both a minimum price ("whatever you want, as long as it's more than $5") or a suggested price ("most people pay $10").
Lastly, you can set up a payment scheme such that paid subscribers pay for every premium email you send. This model is useful for more erratic publishing schedules where charging a flat monthly rate doesn't make sense.
(Note that this pricing model does not allow you to sell access to individual emails.)