[jakopo87]

That's exactly how Brave works after you setup the wallet and it gives you two options:

- pay a variable amount to the website you visit, based on how many visits and time you spent on;

- pay a fixed amount to a website of your choice;

Both options can be enabled at the same time, and the minimum number of visit, or the minimum length of the same, is adjustable;

Flattr[0] should be similar with fiat currency.

[0] https://flattr.com/