[mazugrin2]

For monthly donations, the minimum is actually 3 EUR. And it's super easy to do from the US - just enter a CC number and billing address. What would be a lower bar?

For smaller amounts, I can imagine it would be better to save them some overhead and donate annually. They have a button for doing 10 EUR per year if you still wanted to help out. You can choose any amount that's at least 3 EUR. I imagine even 3 EUR per year would help! Here's the site if you can't find it: https://donorbox.org/kde-community