Well... this is how I just found out about them. I find coil very interesting! Strongly thinking about becoming a member, but I would like to find out if the websites I follow use the web monetization tag first.
As far as I'm aware, there are two ways of discovering that:
1. Start a one month subscription and browse your websites. The add-on changes colour depending on whether the current site is monetized or not.
2. Try to find them here: https://coil.com/explore. If you click on "blogs", there's a search bar that you can use.
There's also a Twitter bot that tracks how many websites have it (https://twitter.com/WebMotized). Currently at 1400, with about a dozen of sites added weekly.
