I quickly tested nostr:npub18ull0tdnj9vugtq259k48szg80al44ta7g4fa85nvj3svaq7kt8s9udcl9 wallet to understand the fee structure, since I cannot find any details about them.

I received 5k sats and there was a 60 sats fee (1,2%); another 5k transaction, another 60 sats fee. So I suppose it's the standard incoming fee.

Transaction's details have some interesting data about the fee: Network fee: 47 sats + Boltz swap fee: 13 sats. Here you discover that it's not a typical Lightning wallet, but something more similar to Muun.

So my balance is now 9880 sats.

Then I tried to pay out.

Using the full balance failed since it required a fee of 48 sats (split here too between Network fee and Boltz swap), so I lowered the amount to 9832, but it continued to block the transaction, lamenting insufficient funds, even if the sum seemed fine. I did a couple of tests lowering the amount, and I was able to send a 9800 sats transaction. At the end I saw that the fee was actually higher, 63 sats (0,6%).

So my wallet was left with 17 sats. But I was not able to send them because "Amount below minimum swap limit: 1000 sats".

Final toughts:

- The wallet's UI is polished and well designed

- Receiving fees are quite high; they should be explained in advance

- There is a bug in the display of sending fees (it should at least say “approximately”)

- For someone that already used LN, these references to swap (and related costs) can be really confusing

- So is 1000 sats the minimum possible transaction? Unexpected.

An informative onboarding or a contextual help could be really useful, solving many users' doubts and so alleviating most frustrations.

One more thing: please let the user empty the wallet, or at worst, increase fees in a creative way! Have sats stuck in a (test) wallet is something that generally irritates users.

/cc nostr:npub1qny3tkh0acurzla8x3zy4nhrjz5zd8l9sy9jys09umwng00manysew95gx since he uses this wallet, and maybe he can correct me on some points.