Instead of paying a fixed amount for every story read, like a typical micropayment, readers volunteer to pay a flat amount?—?say $5, $20, or whatever a month. The user picks the amount and the time frame.
The money is then divvied up by publishers. The default is to divide the money by time spent on sites which use Tipsy, but that can be changed at any point by the user. It’s somewhat like Flattr, another micropayment site, but easier to use.
(via Micropayments for news stories make a comeback. (Maybe.) — 3 to read — Medium)
They note that this Chrome extension app is similar to Flattr. It also works like Kachingle which has been around for a long time, but hasn’t caught on in a big way.