I really like Aqua's way of handling lightning. It reminds me of Muun, but the use of Liquid instead of main-chain makes it more affordable.

However, I don't see it as a (hot) spending wallet.

Liquid->LN costs too much for the coffee use case. A 4100 sat invoice (2€) requires ~400 sats in fees (0.2€). That's 10%.

However, it's a great stacking warm wallet, while a custodial well-connected LSP (WoS, or a good mint) can be the spending wallet.

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Discussion

I agree. Phoenix has a fixed fee of 0.4% for outbound lightning payments. I'd still like to see something a little less, but for a convenient self-custodial wallet for coffee use case, it's currently hard to beat. But at some higher price point, the Aqua fee rate falls below 0.4%. For example, I payed ~600000 sat invoice and Aqua's fee was less than 0.2%.