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cmd/loop: add max swap fee flags for static in

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Add --max_swap_fee_sat and --max_swap_fee_ppm flags to `loop static in`.
When set, the resolved cap is checked against the current quote before
confirmation and sent in MaxSwapFeeSatoshis instead of the quoted fee,
giving scripts a budget ceiling without the quote-then-retry workaround.
This commit is contained in:
Boris Nagaev 2026-04-06 15:56:39 -05:00
parent 6d18faafa9
commit 659d812634
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1 changed files with 29 additions and 2 deletions
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31
cmd/loop/staticaddr.go
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@ -453,6 +453,22 @@ var staticAddressLoopInCommand = &cli.Command{
"higher fee, so the change output is " +
"available sooner",
},
&cli.Uint64Flag{
Name: "max_swap_fee_sat",
Usage: fmt.Sprintf("the maximum swap fee in satoshis. "+
"If set, the swap is rejected when the quoted "+
"fee exceeds this cap. The maximum allowed "+
"value is %d. On-chain fees for creating "+
"static deposits are unaffected.",
maxSwapFeeSatLimit),
},
&cli.Uint64Flag{
Name: "max_swap_fee_ppm",
Usage: "the maximum swap fee expressed in " +
"parts per million of the swap amount. " +
"If set together with --max_swap_fee_sat " +
"the tighter cap is used.",
},
lastHopFlag,
labelFlag,
routeHintsFlag,
@ -585,7 +601,18 @@ func staticAddressLoopIn(ctx context.Context, cmd *cli.Command) error {
return err
}
limits := getInLimits(quote)
// Resolve the effective swap fee cap. When the user provides
// --max_swap_fee_sat and/or --max_swap_fee_ppm the tighter of
// the two is used and checked against the current quote. Without
// overrides the quoted fee is forwarded as before.
maxSwapFee, err := resolveMaxSwapFee(
quoteReq, quote,
cmd.IsSet("max_swap_fee_sat"), cmd.Uint64("max_swap_fee_sat"),
cmd.IsSet("max_swap_fee_ppm"), cmd.Uint64("max_swap_fee_ppm"),
)
if err != nil {
return err
}
if !(cmd.Bool("force") || cmd.Bool("f")) {
err = displayInDetails(quoteReq, quote, cmd.Bool("verbose"))
@ -601,7 +628,7 @@ func staticAddressLoopIn(ctx context.Context, cmd *cli.Command) error {
req := &looprpc.StaticAddressLoopInRequest{
Amount: quoteReq.Amt,
Outpoints: depositOutpoints,
MaxSwapFeeSatoshis: int64(limits.maxSwapFee),
MaxSwapFeeSatoshis: int64(maxSwapFee),
LastHop: lastHop,
Label: label,
Initiator: defaultInitiator,