Mash (now defunct) did this.

No one wants this afaict. I don't even want paywalls. I tolerate them because there's no better way to fight free riding, but I certainly don't want to pay per page of a book, or per scroll of a webpage, or per minute of a video.

What I want:

1. good content
2. creators to be paid, so in the future I will get good content

In no way, do I want to be charged per page.

What creators want:

1. to get paid for producing content

They do not want to be paid per page afaict.

So, who wants to pay per page? If you, the reader, do, I'd ask:

1. How many substacks/patreons are you subscribed to?
2. How many sats have you streamed podcasters this month?
3. How many geyser funds have you contributed to?

If the answer is 0, I'd guess you'd pay for 0 pages too.