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