I quickly tested @BULLBITCOIN.COM 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 @ODELL since he uses this wallet, and maybe he can correct me on some points.