mirror of
https://github.com/lightninglabs/loop
synced 2024-11-13 13:10:30 +00:00
62 lines
2.8 KiB
Markdown
62 lines
2.8 KiB
Markdown
|
|
||
|
|
# Frequently Asked Questions
|
||
|
|
|
||
|
|
## How does Loop recover from a crash?
|
||
|
|
When `loopd` is terminated (or killed) for whatever reason, it will pickup
|
||
|
|
pending swaps after a restart.
|
||
|
|
|
||
|
|
Information about pending swaps is stored persistently in the swap database.
|
||
|
|
Its location is `~/.loopd/<network>/loop.db`.
|
||
|
|
|
||
|
|
## Can Loop handle multiple simultaneous swaps?
|
||
|
|
It is possible to execute multiple swaps simultaneously. Just keep loopd
|
||
|
|
running.
|
||
|
|
|
||
|
|
## What are the fees?
|
||
|
|
|
||
|
|
You can pass the `--verbose` flag when using Loop to get a detailed fee
|
||
|
|
breakdown
|
||
|
|
|
||
|
|
### Loop Out Fees
|
||
|
|
|
||
|
|
An explanation of each fee:
|
||
|
|
|
||
|
|
- **Estimated on-chain fee**: The estimated cost to sweep the
|
||
|
|
HTLC in case of success, calculated based on the _current_ on-chain fees.
|
||
|
|
This value is called `miner_fee` in the gRPC/REST responses.
|
||
|
|
- **Max on-chain fee**: The maximum on-chain fee the daemon
|
||
|
|
is going to allow for sweeping the HTLC in case of success. A fee estimation
|
||
|
|
based on the `--conf_target` flag is always performed before sweeping. The
|
||
|
|
factor of `100` times the estimated fee is applied in case the fees spike
|
||
|
|
between the time the swap is initiated and the time the HTLC can be swept. But
|
||
|
|
that is the absolute worst-case fee that will be paid. If there is no fee
|
||
|
|
spike, a normal, much lower fee will be used.
|
||
|
|
- **Max off-chain swap routing fee**: The maximum off-chain
|
||
|
|
routing fee that the daemon should pay when finding a route to pay the
|
||
|
|
Lightning invoice. This is a hard limit. If no route with a lower or equal fee
|
||
|
|
is found, the payment (and the swap) is aborted. This value is calculated
|
||
|
|
statically based on the swap amount (see `maxRoutingFeeBase` and
|
||
|
|
`maxRoutingFeeRate` in `cmd/loop/main.go`).
|
||
|
|
- **Max off-chain prepay routing fee**: The maximum off-chain routing
|
||
|
|
fee that the daemon should pay when finding a route to pay the prepay fee.
|
||
|
|
This is a hard limit. If no route with a lower or equal fee is found, the
|
||
|
|
payment (and the swap) is aborted. This value is calculated statically based
|
||
|
|
on the prepay amount (see `maxRoutingFeeBase` and `maxRoutingFeeRate` in
|
||
|
|
`cmd/loop/main.go`).
|
||
|
|
- **No show penalty (prepay)**: This is the amount that has to be
|
||
|
|
pre-paid (off-chain) before the server publishes the HTLC on-chain. This is
|
||
|
|
necessary to ensure the server's on-chain fees are paid if the client aborts
|
||
|
|
and never completes the swap _after_ the HTLC has been published on-chain.
|
||
|
|
If the swap completes normally, this amount is counted towards the full swap
|
||
|
|
amount and therefore is actually a pre-payment and not a fee. This value is
|
||
|
|
called `prepay_amt` in the gRPC/REST responses.
|
||
|
|
|
||
|
|
### Loop In Fees
|
||
|
|
|
||
|
|
An explanation of each fee:
|
||
|
|
|
||
|
|
- **Estimated on-chain fee**: The estimated on-chain fee that the
|
||
|
|
daemon has to pay to publish the HTLC. This is an estimation from `lnd`'s
|
||
|
|
wallet based on the available UTXOs and current network fees. This value is
|
||
|
|
called `miner_fee` in the gRPC/REST responses.
|