Merge pull request #697 from sputn1ck/instantout_quote

Instantout: Add fee estimation to CLI

cmd/loop/instantout.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"strconv"
 	"strings"
@@ -97,7 +98,10 @@ func instantOut(ctx *cli.Context) error {
 	fmt.Scanln(&answer)
 
 	// Parse
-	var selectedReservations [][]byte
+	var (
+		selectedReservations [][]byte
+		selectedAmt          uint64
+	)
 	switch answer {
 	case "ALL":
 		for _, res := range confirmedReservations {
@@ -105,6 +109,7 @@ func instantOut(ctx *cli.Context) error {
 				selectedReservations,
 				res.ReservationId,
 			)
+			selectedAmt += res.Amount
 		}
 
 	case "":
@@ -135,9 +140,33 @@ func instantOut(ctx *cli.Context) error {
 			)
 
 			selectedIndexMap[idx] = struct{}{}
+			selectedAmt += confirmedReservations[idx-1].Amount
 		}
 	}
 
+	// Now that we have the selected reservations we can estimate the
+	// fee-rates.
+	quote, err := client.InstantOutQuote(
+		context.Background(), &looprpc.InstantOutQuoteRequest{
+			Amt:             selectedAmt,
+			NumReservations: int32(len(selectedReservations)),
+		},
+	)
+	if err != nil {
+		return err
+	}
+	fmt.Println()
+	fmt.Printf(satAmtFmt, "Estimated on-chain fee:", quote.SweepFeeSat)
+	fmt.Printf(satAmtFmt, "Service fee:", quote.ServiceFeeSat)
+	fmt.Println()
+
+	fmt.Printf("CONTINUE SWAP? (y/n): ")
+
+	fmt.Scanln(&answer)
+	if answer != "y" {
+		return errors.New("swap canceled")
+	}
+
 	fmt.Println("Starting instant swap out")
 
 	// Now we can request the instant out swap.

instantout/manager.go

@@ -7,7 +7,9 @@ import (
 	"sync"
 	"time"
 
+	"github.com/btcsuite/btcd/btcutil"
 	"github.com/lightninglabs/loop/instantout/reservation"
+	"github.com/lightninglabs/loop/swapserverrpc"
 	"github.com/lightningnetwork/lnd/lntypes"
 )
 
@@ -199,3 +201,50 @@ func (m *Manager) GetActiveInstantOut(swapHash lntypes.Hash) (*FSM, error) {
 
 	return fsm, nil
 }
+
+type Quote struct {
+	// ServiceFee is the fee in sat that is paid to the loop service.
+	ServiceFee btcutil.Amount
+
+	// OnChainFee is the estimated on chain fee in sat.
+	OnChainFee btcutil.Amount
+}
+
+// GetInstantOutQuote returns a quote for an instant out.
+func (m *Manager) GetInstantOutQuote(ctx context.Context,
+	amt btcutil.Amount, numReservations int) (Quote, error) {
+
+	if numReservations <= 0 {
+		return Quote{}, fmt.Errorf("no reservations selected")
+	}
+
+	if amt <= 0 {
+		return Quote{}, fmt.Errorf("no amount selected")
+	}
+
+	// Get the service fee.
+	quoteRes, err := m.cfg.InstantOutClient.GetInstantOutQuote(
+		ctx, &swapserverrpc.GetInstantOutQuoteRequest{
+			Amount: uint64(amt),
+		},
+	)
+	if err != nil {
+		return Quote{}, err
+	}
+
+	// Get the offchain fee by getting the fee estimate from the lnd client
+	// and multiplying it by the estimated sweepless sweep transaction.
+	feeRate, err := m.cfg.Wallet.EstimateFeeRate(ctx, normalConfTarget)
+	if err != nil {
+		return Quote{}, err
+	}
+
+	// The on chain chainFee is the chainFee rate times the estimated
+	// sweepless sweep transaction size.
+	chainFee := feeRate.FeeForWeight(sweeplessSweepWeight(numReservations))
+
+	return Quote{
+		ServiceFee: btcutil.Amount(quoteRes.SwapFee),
+		OnChainFee: chainFee,
+	}, nil
+}

loopd/perms/perms.go

@@ -104,4 +104,8 @@ var RequiredPermissions = map[string][]bakery.Op{
 		Entity: "swap",
 		Action: "execute",
 	}},
+	"/looprpc.SwapClient/InstantOutQuote": {{
+		Entity: "swap",
+		Action: "read",
+	}},
 }

loopd/swapclient_server.go

@@ -1209,6 +1209,25 @@ func (s *swapClientServer) InstantOut(ctx context.Context,
 	return res, nil
 }
 
+// InstantOutQuote returns a quote for an instant out swap with the provided
+// parameters.
+func (s *swapClientServer) InstantOutQuote(ctx context.Context,
+	req *clientrpc.InstantOutQuoteRequest) (
+	*clientrpc.InstantOutQuoteResponse, error) {
+
+	quote, err := s.instantOutManager.GetInstantOutQuote(
+		ctx, btcutil.Amount(req.Amt), int(req.NumReservations),
+	)
+	if err != nil {
+		return nil, err
+	}
+
+	return &clientrpc.InstantOutQuoteResponse{
+		ServiceFeeSat: int64(quote.ServiceFee),
+		SweepFeeSat:   int64(quote.OnChainFee),
+	}, nil
+}
+
 func rpcAutoloopReason(reason liquidity.Reason) (clientrpc.AutoReason, error) {
 	switch reason {
 	case liquidity.ReasonNone:

looprpc/client.pb.go

@@ -3731,6 +3731,125 @@ func (x *InstantOutResponse) GetState() string {
 	return ""
 }
 
+type InstantOutQuoteRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	//
+	//The amount to swap in satoshis.
+	Amt uint64 `protobuf:"varint,1,opt,name=amt,proto3" json:"amt,omitempty"`
+	//
+	//The amount of reservations to use for the swap.
+	NumReservations int32 `protobuf:"varint,2,opt,name=num_reservations,json=numReservations,proto3" json:"num_reservations,omitempty"`
+}
+
+func (x *InstantOutQuoteRequest) Reset() {
+	*x = InstantOutQuoteRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_client_proto_msgTypes[38]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *InstantOutQuoteRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*InstantOutQuoteRequest) ProtoMessage() {}
+
+func (x *InstantOutQuoteRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_client_proto_msgTypes[38]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use InstantOutQuoteRequest.ProtoReflect.Descriptor instead.
+func (*InstantOutQuoteRequest) Descriptor() ([]byte, []int) {
+	return file_client_proto_rawDescGZIP(), []int{38}
+}
+
+func (x *InstantOutQuoteRequest) GetAmt() uint64 {
+	if x != nil {
+		return x.Amt
+	}
+	return 0
+}
+
+func (x *InstantOutQuoteRequest) GetNumReservations() int32 {
+	if x != nil {
+		return x.NumReservations
+	}
+	return 0
+}
+
+type InstantOutQuoteResponse struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	//
+	//The fee that the swap service is charging for the swap.
+	ServiceFeeSat int64 `protobuf:"varint,1,opt,name=service_fee_sat,json=serviceFeeSat,proto3" json:"service_fee_sat,omitempty"`
+	//
+	//The estimated on-chain fee that needs to be paid to publish the Sweepless
+	//Sweep.
+	SweepFeeSat int64 `protobuf:"varint,2,opt,name=sweep_fee_sat,json=sweepFeeSat,proto3" json:"sweep_fee_sat,omitempty"`
+}
+
+func (x *InstantOutQuoteResponse) Reset() {
+	*x = InstantOutQuoteResponse{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_client_proto_msgTypes[39]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *InstantOutQuoteResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*InstantOutQuoteResponse) ProtoMessage() {}
+
+func (x *InstantOutQuoteResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_client_proto_msgTypes[39]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use InstantOutQuoteResponse.ProtoReflect.Descriptor instead.
+func (*InstantOutQuoteResponse) Descriptor() ([]byte, []int) {
+	return file_client_proto_rawDescGZIP(), []int{39}
+}
+
+func (x *InstantOutQuoteResponse) GetServiceFeeSat() int64 {
+	if x != nil {
+		return x.ServiceFeeSat
+	}
+	return 0
+}
+
+func (x *InstantOutQuoteResponse) GetSweepFeeSat() int64 {
+	if x != nil {
+		return x.SweepFeeSat
+	}
+	return 0
+}
+
 var File_client_proto protoreflect.FileDescriptor
 
 var file_client_proto_rawDesc = []byte{
@@ -4183,152 +4302,170 @@ var file_client_proto_rawDesc = []byte{
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-	0x6e, 0x69, 0x6e, 0x67, 0x6c, 0x61, 0x62, 0x73, 0x2f, 0x6c, 0x6f, 0x6f, 0x70, 0x2f, 0x6c, 0x6f,
-	0x6f, 0x70, 0x72, 0x70, 0x63, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
+	0x77, 0x61, 0x70, 0x73, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x1a, 0x1d, 0x2e, 0x6c, 0x6f,
+	0x6f, 0x70, 0x72, 0x70, 0x63, 0x2e, 0x53, 0x75, 0x67, 0x67, 0x65, 0x73, 0x74, 0x53, 0x77, 0x61,
+	0x70, 0x73, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x12, 0x57, 0x0a, 0x10, 0x4c, 0x69,
+	0x73, 0x74, 0x52, 0x65, 0x73, 0x65, 0x72, 0x76, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x73, 0x12, 0x20,
+	0x2e, 0x6c, 0x6f, 0x6f, 0x70, 0x72, 0x70, 0x63, 0x2e, 0x4c, 0x69, 0x73, 0x74, 0x52, 0x65, 0x73,
+	0x65, 0x72, 0x76, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x73, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74,
+	0x1a, 0x21, 0x2e, 0x6c, 0x6f, 0x6f, 0x70, 0x72, 0x70, 0x63, 0x2e, 0x4c, 0x69, 0x73, 0x74, 0x52,
+	0x65, 0x73, 0x65, 0x72, 0x76, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x73, 0x52, 0x65, 0x73, 0x70, 0x6f,
+	0x6e, 0x73, 0x65, 0x12, 0x45, 0x0a, 0x0a, 0x49, 0x6e, 0x73, 0x74, 0x61, 0x6e, 0x74, 0x4f, 0x75,
+	0x74, 0x12, 0x1a, 0x2e, 0x6c, 0x6f, 0x6f, 0x70, 0x72, 0x70, 0x63, 0x2e, 0x49, 0x6e, 0x73, 0x74,
+	0x61, 0x6e, 0x74, 0x4f, 0x75, 0x74, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x1a, 0x1b, 0x2e,
+	0x6c, 0x6f, 0x6f, 0x70, 0x72, 0x70, 0x63, 0x2e, 0x49, 0x6e, 0x73, 0x74, 0x61, 0x6e, 0x74, 0x4f,
+	0x75, 0x74, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x12, 0x54, 0x0a, 0x0f, 0x49, 0x6e,
+	0x73, 0x74, 0x61, 0x6e, 0x74, 0x4f, 0x75, 0x74, 0x51, 0x75, 0x6f, 0x74, 0x65, 0x12, 0x1f, 0x2e,
+	0x6c, 0x6f, 0x6f, 0x70, 0x72, 0x70, 0x63, 0x2e, 0x49, 0x6e, 0x73, 0x74, 0x61, 0x6e, 0x74, 0x4f,
+	0x75, 0x74, 0x51, 0x75, 0x6f, 0x74, 0x65, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x1a, 0x20,
+	0x2e, 0x6c, 0x6f, 0x6f, 0x70, 0x72, 0x70, 0x63, 0x2e, 0x49, 0x6e, 0x73, 0x74, 0x61, 0x6e, 0x74,
+	0x4f, 0x75, 0x74, 0x51, 0x75, 0x6f, 0x74, 0x65, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65,
+	0x42, 0x27, 0x5a, 0x25, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x6c,
+	0x69, 0x67, 0x68, 0x74, 0x6e, 0x69, 0x6e, 0x67, 0x6c, 0x61, 0x62, 0x73, 0x2f, 0x6c, 0x6f, 0x6f,
+	0x70, 0x2f, 0x6c, 0x6f, 0x6f, 0x70, 0x72, 0x70, 0x63, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f,
+	0x33,
 }
 
 var (
@@ -4344,7 +4481,7 @@ func file_client_proto_rawDescGZIP() []byte {
 }
 
 var file_client_proto_enumTypes = make([]protoimpl.EnumInfo, 7)
-var file_client_proto_msgTypes = make([]protoimpl.MessageInfo, 38)
+var file_client_proto_msgTypes = make([]protoimpl.MessageInfo, 40)
 var file_client_proto_goTypes = []interface{}{
 	(AddressType)(0),                    // 0: looprpc.AddressType
 	(SwapType)(0),                       // 1: looprpc.SwapType
@@ -4391,19 +4528,21 @@ var file_client_proto_goTypes = []interface{}{
 	(*ClientReservation)(nil),           // 42: looprpc.ClientReservation
 	(*InstantOutRequest)(nil),           // 43: looprpc.InstantOutRequest
 	(*InstantOutResponse)(nil),          // 44: looprpc.InstantOutResponse
-	(*swapserverrpc.RouteHint)(nil),     // 45: looprpc.RouteHint
+	(*InstantOutQuoteRequest)(nil),      // 45: looprpc.InstantOutQuoteRequest
+	(*InstantOutQuoteResponse)(nil),     // 46: looprpc.InstantOutQuoteResponse
+	(*swapserverrpc.RouteHint)(nil),     // 47: looprpc.RouteHint
 }
 var file_client_proto_depIdxs = []int32{
 	0,  // 0: looprpc.LoopOutRequest.account_addr_type:type_name -> looprpc.AddressType
-	45, // 1: looprpc.LoopInRequest.route_hints:type_name -> looprpc.RouteHint
+	47, // 1: looprpc.LoopInRequest.route_hints:type_name -> looprpc.RouteHint
 	1,  // 2: looprpc.SwapStatus.type:type_name -> looprpc.SwapType
 	2,  // 3: looprpc.SwapStatus.state:type_name -> looprpc.SwapState
 	3,  // 4: looprpc.SwapStatus.failure_reason:type_name -> looprpc.FailureReason
 	13, // 5: looprpc.ListSwapsRequest.list_swap_filter:type_name -> looprpc.ListSwapsFilter
 	6,  // 6: looprpc.ListSwapsFilter.swap_type:type_name -> looprpc.ListSwapsFilter.SwapTypeFilter
 	11, // 7: looprpc.ListSwapsResponse.swaps:type_name -> looprpc.SwapStatus
-	45, // 8: looprpc.QuoteRequest.loop_in_route_hints:type_name -> looprpc.RouteHint
-	45, // 9: looprpc.ProbeRequest.route_hints:type_name -> looprpc.RouteHint
+	47, // 8: looprpc.QuoteRequest.loop_in_route_hints:type_name -> looprpc.RouteHint
+	47, // 9: looprpc.ProbeRequest.route_hints:type_name -> looprpc.RouteHint
 	26, // 10: looprpc.TokensResponse.tokens:type_name -> looprpc.LsatToken
 	27, // 11: looprpc.GetInfoResponse.loop_out_stats:type_name -> looprpc.LoopStats
 	27, // 12: looprpc.GetInfoResponse.loop_in_stats:type_name -> looprpc.LoopStats
@@ -4435,26 +4574,28 @@ var file_client_proto_depIdxs = []int32{
 	35, // 38: looprpc.SwapClient.SuggestSwaps:input_type -> looprpc.SuggestSwapsRequest
 	40, // 39: looprpc.SwapClient.ListReservations:input_type -> looprpc.ListReservationsRequest
 	43, // 40: looprpc.SwapClient.InstantOut:input_type -> looprpc.InstantOutRequest
-	9,  // 41: looprpc.SwapClient.LoopOut:output_type -> looprpc.SwapResponse
-	9,  // 42: looprpc.SwapClient.LoopIn:output_type -> looprpc.SwapResponse
-	11, // 43: looprpc.SwapClient.Monitor:output_type -> looprpc.SwapStatus
-	14, // 44: looprpc.SwapClient.ListSwaps:output_type -> looprpc.ListSwapsResponse
-	11, // 45: looprpc.SwapClient.SwapInfo:output_type -> looprpc.SwapStatus
-	39, // 46: looprpc.SwapClient.AbandonSwap:output_type -> looprpc.AbandonSwapResponse
-	18, // 47: looprpc.SwapClient.LoopOutTerms:output_type -> looprpc.OutTermsResponse
-	21, // 48: looprpc.SwapClient.LoopOutQuote:output_type -> looprpc.OutQuoteResponse
-	17, // 49: looprpc.SwapClient.GetLoopInTerms:output_type -> looprpc.InTermsResponse
-	20, // 50: looprpc.SwapClient.GetLoopInQuote:output_type -> looprpc.InQuoteResponse
-	23, // 51: looprpc.SwapClient.Probe:output_type -> looprpc.ProbeResponse
-	25, // 52: looprpc.SwapClient.GetLsatTokens:output_type -> looprpc.TokensResponse
-	29, // 53: looprpc.SwapClient.GetInfo:output_type -> looprpc.GetInfoResponse
-	31, // 54: looprpc.SwapClient.GetLiquidityParams:output_type -> looprpc.LiquidityParameters
-	34, // 55: looprpc.SwapClient.SetLiquidityParams:output_type -> looprpc.SetLiquidityParamsResponse
-	37, // 56: looprpc.SwapClient.SuggestSwaps:output_type -> looprpc.SuggestSwapsResponse
-	41, // 57: looprpc.SwapClient.ListReservations:output_type -> looprpc.ListReservationsResponse
-	44, // 58: looprpc.SwapClient.InstantOut:output_type -> looprpc.InstantOutResponse
-	41, // [41:59] is the sub-list for method output_type
-	23, // [23:41] is the sub-list for method input_type
+	45, // 41: looprpc.SwapClient.InstantOutQuote:input_type -> looprpc.InstantOutQuoteRequest
+	9,  // 42: looprpc.SwapClient.LoopOut:output_type -> looprpc.SwapResponse
+	9,  // 43: looprpc.SwapClient.LoopIn:output_type -> looprpc.SwapResponse
+	11, // 44: looprpc.SwapClient.Monitor:output_type -> looprpc.SwapStatus
+	14, // 45: looprpc.SwapClient.ListSwaps:output_type -> looprpc.ListSwapsResponse
+	11, // 46: looprpc.SwapClient.SwapInfo:output_type -> looprpc.SwapStatus
+	39, // 47: looprpc.SwapClient.AbandonSwap:output_type -> looprpc.AbandonSwapResponse
+	18, // 48: looprpc.SwapClient.LoopOutTerms:output_type -> looprpc.OutTermsResponse
+	21, // 49: looprpc.SwapClient.LoopOutQuote:output_type -> looprpc.OutQuoteResponse
+	17, // 50: looprpc.SwapClient.GetLoopInTerms:output_type -> looprpc.InTermsResponse
+	20, // 51: looprpc.SwapClient.GetLoopInQuote:output_type -> looprpc.InQuoteResponse
+	23, // 52: looprpc.SwapClient.Probe:output_type -> looprpc.ProbeResponse
+	25, // 53: looprpc.SwapClient.GetLsatTokens:output_type -> looprpc.TokensResponse
+	29, // 54: looprpc.SwapClient.GetInfo:output_type -> looprpc.GetInfoResponse
+	31, // 55: looprpc.SwapClient.GetLiquidityParams:output_type -> looprpc.LiquidityParameters
+	34, // 56: looprpc.SwapClient.SetLiquidityParams:output_type -> looprpc.SetLiquidityParamsResponse
+	37, // 57: looprpc.SwapClient.SuggestSwaps:output_type -> looprpc.SuggestSwapsResponse
+	41, // 58: looprpc.SwapClient.ListReservations:output_type -> looprpc.ListReservationsResponse
+	44, // 59: looprpc.SwapClient.InstantOut:output_type -> looprpc.InstantOutResponse
+	46, // 60: looprpc.SwapClient.InstantOutQuote:output_type -> looprpc.InstantOutQuoteResponse
+	42, // [42:61] is the sub-list for method output_type
+	23, // [23:42] is the sub-list for method input_type
 	23, // [23:23] is the sub-list for extension type_name
 	23, // [23:23] is the sub-list for extension extendee
 	0,  // [0:23] is the sub-list for field type_name
@@ -4922,6 +5063,30 @@ func file_client_proto_init() {
 				return nil
 			}
 		}
+		file_client_proto_msgTypes[38].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*InstantOutQuoteRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_client_proto_msgTypes[39].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*InstantOutQuoteResponse); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
 	}
 	type x struct{}
 	out := protoimpl.TypeBuilder{
@@ -4929,7 +5094,7 @@ func file_client_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_client_proto_rawDesc,
 			NumEnums:      7,
-			NumMessages:   38,
+			NumMessages:   40,
 			NumExtensions: 0,
 			NumServices:   1,
 		},

looprpc/client.proto

@@ -120,6 +120,13 @@ service SwapClient {
     InstantOut initiates an instant out swap with the given parameters.
     */
     rpc InstantOut (InstantOutRequest) returns (InstantOutResponse);
+
+    /* loop: `instantoutquote`
+    InstantOutQuote returns a quote for an instant out swap with the provided
+    parameters.
+    */
+    rpc InstantOutQuote (InstantOutQuoteRequest)
+        returns (InstantOutQuoteResponse);
 }
 
 message LoopOutRequest {
@@ -1335,4 +1342,29 @@ message InstantOutResponse {
     The state of the swap.
     */
     string state = 3;
+}
+
+message InstantOutQuoteRequest {
+    /*
+    The amount to swap in satoshis.
+    */
+    uint64 amt = 1;
+
+    /*
+    The amount of reservations to use for the swap.
+    */
+    int32 num_reservations = 2;
+}
+
+message InstantOutQuoteResponse {
+    /*
+    The fee that the swap service is charging for the swap.
+    */
+    int64 service_fee_sat = 1;
+
+    /*
+    The estimated on-chain fee that needs to be paid to publish the Sweepless
+    Sweep.
+    */
+    int64 sweep_fee_sat = 2;
 }

looprpc/client.swagger.json

@@ -759,6 +759,21 @@
         }
       }
     },
+    "looprpcInstantOutQuoteResponse": {
+      "type": "object",
+      "properties": {
+        "service_fee_sat": {
+          "type": "string",
+          "format": "int64",
+          "description": "The fee that the swap service is charging for the swap."
+        },
+        "sweep_fee_sat": {
+          "type": "string",
+          "format": "int64",
+          "description": "The estimated on-chain fee that needs to be paid to publish the Sweepless\nSweep."
+        }
+      }
+    },
     "looprpcInstantOutResponse": {
       "type": "object",
       "properties": {

looprpc/client_grpc.pb.go

@@ -89,6 +89,10 @@ type SwapClientClient interface {
 	// loop: `instantout`
 	//InstantOut initiates an instant out swap with the given parameters.
 	InstantOut(ctx context.Context, in *InstantOutRequest, opts ...grpc.CallOption) (*InstantOutResponse, error)
+	// loop: `instantoutquote`
+	//InstantOutQuote returns a quote for an instant out swap with the provided
+	//parameters.
+	InstantOutQuote(ctx context.Context, in *InstantOutQuoteRequest, opts ...grpc.CallOption) (*InstantOutQuoteResponse, error)
 }
 
 type swapClientClient struct {
@@ -284,6 +288,15 @@ func (c *swapClientClient) InstantOut(ctx context.Context, in *InstantOutRequest
 	return out, nil
 }
 
+func (c *swapClientClient) InstantOutQuote(ctx context.Context, in *InstantOutQuoteRequest, opts ...grpc.CallOption) (*InstantOutQuoteResponse, error) {
+	out := new(InstantOutQuoteResponse)
+	err := c.cc.Invoke(ctx, "/looprpc.SwapClient/InstantOutQuote", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 // SwapClientServer is the server API for SwapClient service.
 // All implementations must embed UnimplementedSwapClientServer
 // for forward compatibility
@@ -359,6 +372,10 @@ type SwapClientServer interface {
 	// loop: `instantout`
 	//InstantOut initiates an instant out swap with the given parameters.
 	InstantOut(context.Context, *InstantOutRequest) (*InstantOutResponse, error)
+	// loop: `instantoutquote`
+	//InstantOutQuote returns a quote for an instant out swap with the provided
+	//parameters.
+	InstantOutQuote(context.Context, *InstantOutQuoteRequest) (*InstantOutQuoteResponse, error)
 	mustEmbedUnimplementedSwapClientServer()
 }
 
@@ -420,6 +437,9 @@ func (UnimplementedSwapClientServer) ListReservations(context.Context, *ListRese
 func (UnimplementedSwapClientServer) InstantOut(context.Context, *InstantOutRequest) (*InstantOutResponse, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method InstantOut not implemented")
 }
+func (UnimplementedSwapClientServer) InstantOutQuote(context.Context, *InstantOutQuoteRequest) (*InstantOutQuoteResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method InstantOutQuote not implemented")
+}
 func (UnimplementedSwapClientServer) mustEmbedUnimplementedSwapClientServer() {}
 
 // UnsafeSwapClientServer may be embedded to opt out of forward compatibility for this service.
@@ -760,6 +780,24 @@ func _SwapClient_InstantOut_Handler(srv interface{}, ctx context.Context, dec fu
 	return interceptor(ctx, in, info, handler)
 }
 
+func _SwapClient_InstantOutQuote_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(InstantOutQuoteRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(SwapClientServer).InstantOutQuote(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/looprpc.SwapClient/InstantOutQuote",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(SwapClientServer).InstantOutQuote(ctx, req.(*InstantOutQuoteRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 // SwapClient_ServiceDesc is the grpc.ServiceDesc for SwapClient service.
 // It's only intended for direct use with grpc.RegisterService,
 // and not to be introspected or modified (even as a copy)
@@ -835,6 +873,10 @@ var SwapClient_ServiceDesc = grpc.ServiceDesc{
 			MethodName: "InstantOut",
 			Handler:    _SwapClient_InstantOut_Handler,
 		},
+		{
+			MethodName: "InstantOutQuote",
+			Handler:    _SwapClient_InstantOutQuote_Handler,
+		},
 	},
 	Streams: []grpc.StreamDesc{
 		{

looprpc/swapclient.pb.json.go

@@ -487,4 +487,29 @@ func RegisterSwapClientJSONCallbacks(registry map[string]func(ctx context.Contex
 		}
 		callback(string(respBytes), nil)
 	}
+
+	registry["looprpc.SwapClient.InstantOutQuote"] = func(ctx context.Context,
+		conn *grpc.ClientConn, reqJSON string, callback func(string, error)) {
+
+		req := &InstantOutQuoteRequest{}
+		err := marshaler.Unmarshal([]byte(reqJSON), req)
+		if err != nil {
+			callback("", err)
+			return
+		}
+
+		client := NewSwapClientClient(conn)
+		resp, err := client.InstantOutQuote(ctx, req)
+		if err != nil {
+			callback("", err)
+			return
+		}
+
+		respBytes, err := marshaler.Marshal(resp)
+		if err != nil {
+			callback("", err)
+			return
+		}
+		callback(string(respBytes), nil)
+	}
 }

swapserverrpc/instantout.pb.go

@@ -746,6 +746,102 @@ func (*CancelInstantSwapResponse) Descriptor() ([]byte, []int) {
 	return file_instantout_proto_rawDescGZIP(), []int{11}
 }
 
+type GetInstantOutQuoteRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// The amount to swap in satoshis.
+	Amount uint64 `protobuf:"varint,1,opt,name=amount,proto3" json:"amount,omitempty"`
+}
+
+func (x *GetInstantOutQuoteRequest) Reset() {
+	*x = GetInstantOutQuoteRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_instantout_proto_msgTypes[12]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *GetInstantOutQuoteRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*GetInstantOutQuoteRequest) ProtoMessage() {}
+
+func (x *GetInstantOutQuoteRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_instantout_proto_msgTypes[12]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use GetInstantOutQuoteRequest.ProtoReflect.Descriptor instead.
+func (*GetInstantOutQuoteRequest) Descriptor() ([]byte, []int) {
+	return file_instantout_proto_rawDescGZIP(), []int{12}
+}
+
+func (x *GetInstantOutQuoteRequest) GetAmount() uint64 {
+	if x != nil {
+		return x.Amount
+	}
+	return 0
+}
+
+type GetInstantOutQuoteResponse struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// The swap fee in satoshis.
+	SwapFee uint64 `protobuf:"varint,1,opt,name=swap_fee,json=swapFee,proto3" json:"swap_fee,omitempty"`
+}
+
+func (x *GetInstantOutQuoteResponse) Reset() {
+	*x = GetInstantOutQuoteResponse{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_instantout_proto_msgTypes[13]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *GetInstantOutQuoteResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*GetInstantOutQuoteResponse) ProtoMessage() {}
+
+func (x *GetInstantOutQuoteResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_instantout_proto_msgTypes[13]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use GetInstantOutQuoteResponse.ProtoReflect.Descriptor instead.
+func (*GetInstantOutQuoteResponse) Descriptor() ([]byte, []int) {
+	return file_instantout_proto_rawDescGZIP(), []int{13}
+}
+
+func (x *GetInstantOutQuoteResponse) GetSwapFee() uint64 {
+	if x != nil {
+		return x.SwapFee
+	}
+	return 0
+}
+
 var File_instantout_proto protoreflect.FileDescriptor
 
 var file_instantout_proto_rawDesc = []byte{
@@ -822,49 +918,62 @@ var file_instantout_proto_rawDesc = []byte{
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 }
 
 var (
@@ -880,7 +989,7 @@ func file_instantout_proto_rawDescGZIP() []byte {
 }
 
 var file_instantout_proto_enumTypes = make([]protoimpl.EnumInfo, 1)
-var file_instantout_proto_msgTypes = make([]protoimpl.MessageInfo, 12)
+var file_instantout_proto_msgTypes = make([]protoimpl.MessageInfo, 14)
 var file_instantout_proto_goTypes = []interface{}{
 	(InstantOutProtocolVersion)(0),      // 0: looprpc.InstantOutProtocolVersion
 	(*InstantLoopOutRequest)(nil),       // 1: looprpc.InstantLoopOutRequest
@@ -895,6 +1004,8 @@ var file_instantout_proto_goTypes = []interface{}{
 	(*PushPreimageResponse)(nil),        // 10: looprpc.PushPreimageResponse
 	(*CancelInstantSwapRequest)(nil),    // 11: looprpc.CancelInstantSwapRequest
 	(*CancelInstantSwapResponse)(nil),   // 12: looprpc.CancelInstantSwapResponse
+	(*GetInstantOutQuoteRequest)(nil),   // 13: looprpc.GetInstantOutQuoteRequest
+	(*GetInstantOutQuoteResponse)(nil),  // 14: looprpc.GetInstantOutQuoteResponse
 }
 var file_instantout_proto_depIdxs = []int32{
 	0,  // 0: looprpc.InstantLoopOutRequest.protocol_version:type_name -> looprpc.InstantOutProtocolVersion
@@ -904,14 +1015,16 @@ var file_instantout_proto_depIdxs = []int32{
 	7,  // 4: looprpc.InstantSwapServer.PushHtlcSig:input_type -> looprpc.PushHtlcSigRequest
 	9,  // 5: looprpc.InstantSwapServer.PushPreimage:input_type -> looprpc.PushPreimageRequest
 	11, // 6: looprpc.InstantSwapServer.CancelInstantSwap:input_type -> looprpc.CancelInstantSwapRequest
-	2,  // 7: looprpc.InstantSwapServer.RequestInstantLoopOut:output_type -> looprpc.InstantLoopOutResponse
-	4,  // 8: looprpc.InstantSwapServer.PollPaymentAccepted:output_type -> looprpc.PollPaymentAcceptedResponse
-	6,  // 9: looprpc.InstantSwapServer.InitHtlcSig:output_type -> looprpc.InitHtlcSigResponse
-	8,  // 10: looprpc.InstantSwapServer.PushHtlcSig:output_type -> looprpc.PushHtlcSigResponse
-	10, // 11: looprpc.InstantSwapServer.PushPreimage:output_type -> looprpc.PushPreimageResponse
-	12, // 12: looprpc.InstantSwapServer.CancelInstantSwap:output_type -> looprpc.CancelInstantSwapResponse
-	7,  // [7:13] is the sub-list for method output_type
-	1,  // [1:7] is the sub-list for method input_type
+	13, // 7: looprpc.InstantSwapServer.GetInstantOutQuote:input_type -> looprpc.GetInstantOutQuoteRequest
+	2,  // 8: looprpc.InstantSwapServer.RequestInstantLoopOut:output_type -> looprpc.InstantLoopOutResponse
+	4,  // 9: looprpc.InstantSwapServer.PollPaymentAccepted:output_type -> looprpc.PollPaymentAcceptedResponse
+	6,  // 10: looprpc.InstantSwapServer.InitHtlcSig:output_type -> looprpc.InitHtlcSigResponse
+	8,  // 11: looprpc.InstantSwapServer.PushHtlcSig:output_type -> looprpc.PushHtlcSigResponse
+	10, // 12: looprpc.InstantSwapServer.PushPreimage:output_type -> looprpc.PushPreimageResponse
+	12, // 13: looprpc.InstantSwapServer.CancelInstantSwap:output_type -> looprpc.CancelInstantSwapResponse
+	14, // 14: looprpc.InstantSwapServer.GetInstantOutQuote:output_type -> looprpc.GetInstantOutQuoteResponse
+	8,  // [8:15] is the sub-list for method output_type
+	1,  // [1:8] is the sub-list for method input_type
 	1,  // [1:1] is the sub-list for extension type_name
 	1,  // [1:1] is the sub-list for extension extendee
 	0,  // [0:1] is the sub-list for field type_name
@@ -1067,6 +1180,30 @@ func file_instantout_proto_init() {
 				return nil
 			}
 		}
+		file_instantout_proto_msgTypes[12].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*GetInstantOutQuoteRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_instantout_proto_msgTypes[13].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*GetInstantOutQuoteResponse); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
 	}
 	type x struct{}
 	out := protoimpl.TypeBuilder{
@@ -1074,7 +1211,7 @@ func file_instantout_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_instantout_proto_rawDesc,
 			NumEnums:      1,
-			NumMessages:   12,
+			NumMessages:   14,
 			NumExtensions: 0,
 			NumServices:   1,
 		},

swapserverrpc/instantout.proto

@@ -33,6 +33,11 @@ service InstantSwapServer {
     // called if the swap has not been accepted yet.
     rpc CancelInstantSwap (CancelInstantSwapRequest)
         returns (CancelInstantSwapResponse);
+
+    // GetInstantOutQuote returns the absolute fee in satoshis for the swap and
+    // the pubkey to query the route to estimate offchain payment fees.
+    rpc GetInstantOutQuote (GetInstantOutQuoteRequest)
+        returns (GetInstantOutQuoteResponse);
 }
 
 message InstantLoopOutRequest {
@@ -130,6 +135,16 @@ message CancelInstantSwapRequest {
 message CancelInstantSwapResponse {
 }
 
+message GetInstantOutQuoteRequest {
+    // The amount to swap in satoshis.
+    uint64 amount = 1;
+}
+
+message GetInstantOutQuoteResponse {
+    // The swap fee in satoshis.
+    uint64 swap_fee = 1;
+}
+
 enum InstantOutProtocolVersion {
     INSTANTOUT_NONE = 0;
     INSTANTOUT_FULL_RESERVATION = 1;

swapserverrpc/instantout_grpc.pb.go

@@ -34,6 +34,9 @@ type InstantSwapServerClient interface {
 	// CancelInstantSwap tries to cancel the instant swap. This can only be
 	// called if the swap has not been accepted yet.
 	CancelInstantSwap(ctx context.Context, in *CancelInstantSwapRequest, opts ...grpc.CallOption) (*CancelInstantSwapResponse, error)
+	// GetInstantOutQuote returns the absolute fee in satoshis for the swap and
+	// the pubkey to query the route to estimate offchain payment fees.
+	GetInstantOutQuote(ctx context.Context, in *GetInstantOutQuoteRequest, opts ...grpc.CallOption) (*GetInstantOutQuoteResponse, error)
 }
 
 type instantSwapServerClient struct {
@@ -98,6 +101,15 @@ func (c *instantSwapServerClient) CancelInstantSwap(ctx context.Context, in *Can
 	return out, nil
 }
 
+func (c *instantSwapServerClient) GetInstantOutQuote(ctx context.Context, in *GetInstantOutQuoteRequest, opts ...grpc.CallOption) (*GetInstantOutQuoteResponse, error) {
+	out := new(GetInstantOutQuoteResponse)
+	err := c.cc.Invoke(ctx, "/looprpc.InstantSwapServer/GetInstantOutQuote", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 // InstantSwapServerServer is the server API for InstantSwapServer service.
 // All implementations must embed UnimplementedInstantSwapServerServer
 // for forward compatibility
@@ -118,6 +130,9 @@ type InstantSwapServerServer interface {
 	// CancelInstantSwap tries to cancel the instant swap. This can only be
 	// called if the swap has not been accepted yet.
 	CancelInstantSwap(context.Context, *CancelInstantSwapRequest) (*CancelInstantSwapResponse, error)
+	// GetInstantOutQuote returns the absolute fee in satoshis for the swap and
+	// the pubkey to query the route to estimate offchain payment fees.
+	GetInstantOutQuote(context.Context, *GetInstantOutQuoteRequest) (*GetInstantOutQuoteResponse, error)
 	mustEmbedUnimplementedInstantSwapServerServer()
 }
 
@@ -143,6 +158,9 @@ func (UnimplementedInstantSwapServerServer) PushPreimage(context.Context, *PushP
 func (UnimplementedInstantSwapServerServer) CancelInstantSwap(context.Context, *CancelInstantSwapRequest) (*CancelInstantSwapResponse, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method CancelInstantSwap not implemented")
 }
+func (UnimplementedInstantSwapServerServer) GetInstantOutQuote(context.Context, *GetInstantOutQuoteRequest) (*GetInstantOutQuoteResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method GetInstantOutQuote not implemented")
+}
 func (UnimplementedInstantSwapServerServer) mustEmbedUnimplementedInstantSwapServerServer() {}
 
 // UnsafeInstantSwapServerServer may be embedded to opt out of forward compatibility for this service.
@@ -264,6 +282,24 @@ func _InstantSwapServer_CancelInstantSwap_Handler(srv interface{}, ctx context.C
 	return interceptor(ctx, in, info, handler)
 }
 
+func _InstantSwapServer_GetInstantOutQuote_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(GetInstantOutQuoteRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(InstantSwapServerServer).GetInstantOutQuote(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/looprpc.InstantSwapServer/GetInstantOutQuote",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(InstantSwapServerServer).GetInstantOutQuote(ctx, req.(*GetInstantOutQuoteRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 // InstantSwapServer_ServiceDesc is the grpc.ServiceDesc for InstantSwapServer service.
 // It's only intended for direct use with grpc.RegisterService,
 // and not to be introspected or modified (even as a copy)
@@ -295,6 +331,10 @@ var InstantSwapServer_ServiceDesc = grpc.ServiceDesc{
 			MethodName: "CancelInstantSwap",
 			Handler:    _InstantSwapServer_CancelInstantSwap_Handler,
 		},
+		{
+			MethodName: "GetInstantOutQuote",
+			Handler:    _InstantSwapServer_GetInstantOutQuote_Handler,
+		},
 	},
 	Streams:  []grpc.StreamDesc{},
 	Metadata: "instantout.proto",