Have y'all seen the KISS app yet?
This is an app you download to your phone that serializes fiction. It works both for what we think of as serialized stories like on Wattpad. But they also take books fully complete and published and break them down (by chapter usually) to serialize them. Reader then purchase coins they can use to read a little at a time. Basically, you pay for what you read.
There's a great line up of books already on the app, and they're adding more daily. I got lucky that my publisher has arranged for my books to be included, and a few are already up. So of course, I had to go check it out.
I may, or may not, have gotten sucked into another author's story and read it all night. LOL. So it's definitely addictive. I've also found it very handy for reading in the car when waiting to pick up kids from activities and so forth.
Anyway...give KISS a look see. While you're at it, maybe try out one of mine!