In Breez, in the side menu, there's a "Apps" sections, where you can select FixedFloat. In FixedFloat you just select cryptocurrency you would like to pay to (e.g. Monero) and then scan Monero QR code or paste address and tap on Exchange. And that's it.
Wait what? That’s amazing.
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Am I wrong to think this is better than a coinjoin?
I'm not sure I'll ever need to pay with Monero or the other coins on the FixedFloat platform. But thanks a lot for the hint 👍