Custom On-chain Fee Rate for Loop Out?

[bushev]

Hi team,

I’m using Lightning Terminal on Umbrel to perform loop outs from the Lightning Network to on-chain BTC. A major issue I’m facing is the inability to manually set the on-chain fee rate.

The GUI only allows setting a confirmation target (starting from 100 blocks), which is too slow for my use case. I want the loop out to confirm as quickly as possible.

If I leave the field blank, the fee defaults to something like 1 sat/vbyte, which is way too low given the current network congestion. As a result, transactions get stuck in the mempool for a long time.

Is there a way—through Umbrel’s terminal, CLI, or config—to specify the exact fee rate (e.g., 15 sat/vbyte) manually?

Thanks!

[alexbosworth]

what fee are you seeing when you specify a fast confirmation target?

if it's really stuck at the maximum fee rate and you want to bump it even more than that you can do bumpfee

[bushev]

Thanks for the quick response!

The issue is that the only option I’m given in the GUI is to specify a confirmation target block number, which—due to validation rules—can only start at 100 blocks. That’s way too slow for my needs.

If I leave that field blank, the fee ends up being just a bit over 1 sat/vbyte, which results in the transaction getting stuck for a long time, especially with the current mempool congestion.

What I’d really like is the ability to set an exact fee rate, e.g., 15 sat/vbyte, directly when initiating the loop out.

Also, could you please clarify how exactly bumpfee works in this context? Is there a way to use it with a loop out that’s already been initiated through Umbrel? Some guidance or examples would be much appreciated.

[alexbosworth]

that sounds like a wrong validation then, it should allow for a fast conf target

@levmi this would correspond with the conf target argument

   --conf_target value           the number of blocks from the swap initiation height that the on-chain HTLC should be swept within (default: 9)

[levmi]

Are you using the litd binary UI or terminal.lightning.engineering?