I did not get it how it could be used for a _static blog_.
>…the paywall fetches the content behind the scenes, and since our response is JSON rather than HTML it has nothing to render in place, so it navigates to an in-memory object URL created from the response. The protocol itself is pay per use, so every time you hit an API - you will be charged.
So it can't be used to 'unlock' a paid article forever? You can only read it once, and if you closed the tab, you need to pay again?
There is a description of an access token, so it looks like you'll have some time to access a page. Anyway, this is more for bots. If you want this page so much, just print it to pdf.