Repository: lightningnetwork/lnd
Pull request #8136 (2023-10-31 14:51:16)

Probing for more reliable route fee estimation
This PR implements https://github.com/lightningnetwork/lnd/issues/7916

### Overview

In this PR we extend the implementation of the graph based`EstimateRouteFee` RPC with a payment probe based approach to obtain a more reliable routing fee estimate.

### Notes on implementation

- The new fee estimation API now optionally accepts an invoice from the target node and a probe payment timeout.
- Probing distinguishes two cases, (1) probing to a public destination key specified in the invoice or (2), probing a private invoice destination reachable through public hop hints in the invoice.
- If multiple hop hints are provided then, for each of the public ones, a probe is dispatched and each of the fee estimates is returned. Private hints are skipped.
- `lncli` adds support to use the graph-based and probe-based fee estimation:

graph-based: 
```
lncli estimateroutefee --dest 0266a18ed969ef95c8a5aa314b443b2b3b8d91ed1d9f8e95476f5f4647efdec079 --amt 100000
```
probe-based: 
```
lncli estimateroutefee reg_zane estimateroutefee --pay_req lnbcrt1m1pj... --timeout 60s
```

JssDWt: There is currently a problem with prepayment probing in combination with some lightning service providers. Basically prepayment probes are not compatible with the current LSP protocols. Since nodes behind a LSP can be a significant portion of destinations, I think it's good to keep the following considerations in mind. In below context, assume the payee is a lightning node behind a LSP.

In the current state I generally recommend against sending prepayment probes when a LSP is involved. I guess the question is: how do you determine whether a LSP is involved? Let's outline the protocols and their caveats.

#### Present: Breez LSP
- Prepayment probes with a random payment hash will, in some situations around just-in-time channels, fail with `unknown_next_peer` returned by the LSP, even though the _actual_ payment with the real payment hash would succeed. 
- There is an option to re-hash the payment hash prefixed with `probing-01`, like [here](https://github.com/breez/lspd/blob/33b7e1dd6d53e26dd8bf1d9c08cd69bf085d4bd4/itest/probing_test.go#L54-L57). When used with the current Breez LSP, the Breez LSP will return `incorrect_or_unknown_payment_details` in the same situations as where the previous bullet would return `unknown_next_peer`.

#### Soon: LSPS2
Very soon Breez and multiple other LSPs will implement the [LSPS2 protocol](https://github.com/BitcoinAndLightningLayerSpecs/lsp/blob/main/LSPS2/README.md). This is a protocol for just-in-time channels. This initial version of the protocol is incompatible with prepayment probes. There are no payment hash tricks here.

These nodes should have feature bit 729 (`option_supports_lsps`) set in their node announcement. Recommendation is to send the prepayment probe to the node in the route hint, rather than the destination node, if this feature bit is set for the route hint node and the destination node is only reachable through the route hint node (quite a mouthful, sorry about that).

#### Medium term: LSPS4
The LSP spec group is currently in the process of designing a LSP protocol LSPS4 for just-in-time channels. When LSPS4 is fully implemented, prepayment probes won't be much of an issue. This is not going to be implemented soon, however.

#### Other thoughts
Prepayment probes don't work together with MPP very well. At least there is no indication whether you were able to deliver the full amount for the specified fee, even if all payment parts return with `incorrect_or_unknown_payment_details`. Point is the parts do not all arrive at the same time, like they would in an actual payment. The previous parts locking up liquidity in the route on an actual payment may very well change the path chosen for next parts.
hieblmi: Thanks for the detailed rundown on LSP mechanics @JssDWt.

The primary focus of this PR is to improve the currently active graph based method of estimating routing fees. It is unreliable because the gossip announcements might not accurately reflect the network topology or fees at the time when a payment occurs. So in this first step the desired outcome is to improve the fee estimation for payments to publicly known nodes.

Follow-up PRs will focus on MPP/AMP as noted in the linked issue https://github.com/lightningnetwork/lnd/issues/7916. This seems to have gotten possible since the release of AMP by invalidating the last shard of a AMP, see https://github.com/lightningnetwork/lnd/issues/4219#issuecomment-908833773.

I think LSP specific probing protocols will also land with a separate PR.
Roasbeef: > Prepayment probes don't work together with MPP very well. At least there is no indication whether you were able to deliver the full amount for the specified fee, 

AMP solves that. You can send the N-1 shards, then make the Nth shared fail by giving it an invalid secret share. 
Roasbeef: @JssDWt 

> These nodes should have feature bit 729 (option_supports_lsps) set in their node announcement. Recommendation is to send the prepayment probe to the node in the route hint, rather than the destination node, if this feature bit is set for the route hint node and the destination node is only reachable through the route hint node (quite a mouthful, sorry about that).

How will that work if a probing hash is used, and also only a single shard is sent that may be below the actual payment amount? The LSP just decides on a value to use for channel opening? What if the sender doesn't retry again, the LSP just eats the chain fees cost? What about if the user already has a channel open? 
JssDWt: @Roasbeef 

Assuming you're asking about probing all the way to the destination node, and not up until the LSP. Let me answer these one by one.
 
> How will that work if a probing hash is used, and also only a single shard is sent that may be below the actual payment amount? 

In that case the single shard is failed back by the LSP after a timeperiod similar to the MPP timeout. The recipient's invoice amount is the threshold for letting htlcs through and trigger channel open.

> The LSP just decides on a value to use for channel opening? 

The recipient communicates the intended amount to receive to the LSP before creating the invoice. The invoice then contains a route hint with a scid specifically for this payment/channel order. 

> What about if the user already has a channel open?

In that case there are no issues. The destination works like any other lightning node. Only if the recipient ordered a cchannel for that payment will this LSPS2 spec be used.
Roasbeef: @hieblmi is this ready to leave draft? 
hieblmi: > @hieblmi is this ready to leave draft?

@Roasbeef I will move to 'ready' once I have incorporated the hop hint fee estimation and refactor suggestions. Will focus on it.
lightninglabs-deploy: @bitromortac: review reminder
@hieblmi, remember to re-request review from reviewers when ready
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hieblmi: There are some LSP heuristic improvements that are still pending. I will ping the reviewers once they are pushed.
hieblmi: @bitromortac, @ProofOfKeags, @champo  thanks for your thorough reviews. I think I addressed all comments.

I am still working on the probing timeout test, but imo the review can continue without it for now.

@bitromortac 
We talked offline about the total cltv delta discrepancy of 3 blocks between graph and probe based estimates. Do harmonize the two I've added the block padding delta to the graph based estimation, see https://github.com/lightningnetwork/lnd/pull/8136/commits/87e0f9f218acd1d16ec0b45e75dc7d95be04fc58#diff-9ced6590b7c4cfad60e1fa1641b602da6fe758092211f30a55b19771e4186842R444

The other uncertainty I had was around handling the `MinFinalCLTVExpiryDelta` in combination with hop hints. In our LSP case we now add the cltv delta provided in the hop hint to the total cltv delta determined by the probe, but only in case it is greater than the `payReq.MinFinalCLTVExpiry()`, and `payReq.MinFinalCLTVExpiry()` otherwise, see https://github.com/lightningnetwork/lnd/pull/8136/commits/87e0f9f218acd1d16ec0b45e75dc7d95be04fc58#diff-9ced6590b7c4cfad60e1fa1641b602da6fe758092211f30a55b19771e4186842R550

I still have a doubt about the hop cltv determined by our `isLsp` heuristic, it is here https://github.com/lightningnetwork/lnd/pull/8136/commits/87e0f9f218acd1d16ec0b45e75dc7d95be04fc58#r1479710025

Thanks again for your time and effort!
alexbosworth: > The issue with the zero amount invoices made me think if accepting an invoice to the api is really the best choice? There is some flow where a wallet gets a zero-amount invoice and the user fills in the amount. A probe would then be done with that amount. Right now we fail that use-case. 

Failing isn't good, but it could also just have a separate amount field to mirror the send payment API, which would match the design pattern of probe with the arguments you want to use for a payment before you actually pay.

I can see the argument for generic probing fields but thinking about the history of this feature what motivated it from a user perspective is that doing this yourself is too hard, even though you can actually do everything yourself with the existing APIs. This API adds zero functionality you couldn't achieve some other way with other APIs and you can already break things down into components if you want to do that. So given that motivating logic, making it easier with just the payment request would be easier and therefore correct for this API.
saubyk: > Failing isn't good, but it could also just have a separate amount field to mirror the send payment API, which would match the design pattern of probe with the arguments you want to use for a payment before you actually pay.
> 
> I can see the argument for generic probing fields but thinking about the history of this feature what motivated it from a user perspective is that doing this yourself is too hard, even though you can actually do everything yourself with the existing APIs. This API adds zero functionality you couldn't achieve some other way with other APIs and you can already break things down into components if you want to do that. So given that motivating logic, making it easier with just the payment request would be easier and therefore correct for this API.

+1
Also, if keeping the API future compatible with bolt12 is a concern, can that be handled internally by checking the format first for the invoice type? I believe a determination can be made my looking at the invoice string if it's bolt11 or 12
hieblmi: Once again thanks for the thorough review @ProofOfKeags + @bitromortac, I've addressed all your comments.
Most notably I restructured `isLsp` to only check what its name implies, and added `prepareLspRouteHints` to handle the extraction of `adjustedRouteHints` which allow probing the LSP. I've also made the requested changes to tests and itests. 

This PR is ready for another review round.

Patch:
diff --git a/cmd/lncli/cmd_payments.go b/cmd/lncli/cmd_payments.go
index bee74e31c..1ba3b42c8 100644
--- a/cmd/lncli/cmd_payments.go
+++ b/cmd/lncli/cmd_payments.go
@@ -1799,10 +1799,100 @@ func deletePayments(ctx *cli.Context) error {
 	return nil
 }
 
+var estimateRouteFeeCommand = cli.Command{
+	Name:     "estimateroutefee",
+	Category: "Payments",
+	Usage:    "Estimate routing fees based on a destination or an invoice.",
+	Action:   actionDecorator(estimateRouteFee),
+	Flags: []cli.Flag{
+		cli.StringFlag{
+			Name: "dest",
+			Usage: "the 33-byte hex-encoded public key for the " +
+				"probe destination. If it is specified then " +
+				"the amt flag is required. If it isn't " +
+				"specified then the pay_req field has to.",
+		},
+		cli.Int64Flag{
+			Name: "amt",
+			Usage: "the payment amount expressed in satoshis " +
+				"that should be probed for. This field is " +
+				"mandatory if dest is specified.",
+		},
+		cli.StringFlag{
+			Name: "pay_req",
+			Usage: "a zpay32 encoded payment request which is " +
+				"used to probe. If the destination is " +
+				"not public then route hints are scanned for " +
+				"a public node.",
+		},
+		cli.DurationFlag{
+			Name: "timeout",
+			Usage: "a deadline for the probe attempt. Only " +
+				"applicable if pay_req is specified.",
+			Value: paymentTimeout,
+		},
+	},
+}
+
+func estimateRouteFee(ctx *cli.Context) error {
+	ctxc := getContext()
+	conn := getClientConn(ctx, false)
+	defer conn.Close()
+
+	client := routerrpc.NewRouterClient(conn)
+
+	req := &routerrpc.RouteFeeRequest{}
+
+	switch {
+	case ctx.IsSet("dest") && ctx.IsSet("pay_req"):
+		return fmt.Errorf("either dest or pay_req can be set")
+
+	case ctx.IsSet("dest") && !ctx.IsSet("amt"):
+		return fmt.Errorf("amt is required when dest is set")
+
+	case ctx.IsSet("dest"):
+		dest, err := hex.DecodeString(ctx.String("dest"))
+		if err != nil {
+			return err
+		}
+
+		if len(dest) != 33 {
+			return fmt.Errorf("dest node pubkey must be exactly "+
+				"33 bytes, is instead: %v", len(dest))
+		}
+
+		amtSat := ctx.Int64("amt")
+		if amtSat == 0 {
+			return fmt.Errorf("non-zero amount required")
+		}
+
+		req.Dest = dest
+		req.AmtSat = amtSat
+
+	case ctx.IsSet("pay_req"):
+		req.PaymentRequest = stripPrefix(ctx.String("pay_req"))
+		if ctx.IsSet("timeout") {
+			req.Timeout = uint32(ctx.Duration("timeout").Seconds())
+		}
+
+	default:
+		return fmt.Errorf("fee estimation arguments missing")
+	}
+
+	resp, err := client.EstimateRouteFee(ctxc, req)
+	if err != nil {
+		return err
+	}
+
+	printRespJSON(resp)
+
+	return nil
+}
+
 // ESC is the ASCII code for escape character.
 const ESC = 27
 
-// clearCode defines a terminal escape code to clear the currently line and move
+// clearCode defines a terminal escape code to clear the current line and move
 // the cursor up.
 var clearCode = fmt.Sprintf("%c[%dA%c[2K", ESC, 1, ESC)
 
diff --git a/cmd/lncli/main.go b/cmd/lncli/main.go
index b0ef75b40..e956dbf91 100644
--- a/cmd/lncli/main.go
+++ b/cmd/lncli/main.go
@@ -507,6 +507,7 @@ func main() {
 		subscribeCustomCommand,
 		fishCompletionCommand,
 		listAliasesCommand,
+		estimateRouteFeeCommand,
 	}
 
 	// Add any extra commands determined by build flags.
diff --git a/docs/release-notes/release-notes-0.18.0.md b/docs/release-notes/release-notes-0.18.0.md
index 4ef9d7dd9..a601123cf 100644
--- a/docs/release-notes/release-notes-0.18.0.md
+++ b/docs/release-notes/release-notes-0.18.0.md
@@ -221,9 +221,15 @@
   error is defined as a routing error found in one of a MPP's HTLC attempts.
   If, however, there's only one HTLC attempt, when it's failed, this payment is
   considered failed, thus there's no such thing as temp error for a non-MPP.
+
 * Support for
   [MinConf](https://github.com/lightningnetwork/lnd/pull/8097)(minimum number
   of confirmations) has been added to the `WalletBalance` RPC call.
+ 
+* [EstimateRouteFee](https://github.com/lightningnetwork/lnd/pull/8136) extends
+  the graph based estimation by a payment probe approach which can lead to more
+  accurate estimates. The new estimation method manually incorporates fees of
+  destinations that lie hidden behind lightning service providers.
 
 * `PendingChannels` now optionally returns the 
   [raw hex of the closing tx](https://github.com/lightningnetwork/lnd/pull/8426)
@@ -250,6 +256,9 @@
 * `pendingchannels` now optionally returns the 
   [raw hex of the closing tx](https://github.com/lightningnetwork/lnd/pull/8426)
   in `waiting_close_channels`.
+ 
+* The [estimateroutefee](https://github.com/lightningnetwork/lnd/pull/8136)
+  subcommand now gives access to graph based and payment probe fee estimation.
 
 ## Code Health
 
@@ -346,10 +355,10 @@
 * Keagan McClelland
 * Marcos Fernandez Perez
 * Matt Morehouse
+* Ononiwu Maureen Chiamaka
 * Slyghtning
 * Tee8z
 * Turtle
-* Ononiwu Maureen Chiamaka
 * w3irdrobot
 * Yong Yu
 * Ziggie
diff --git a/lnrpc/routerrpc/config.go b/lnrpc/routerrpc/config.go
index ec70b6d46..7b6d14599 100644
--- a/lnrpc/routerrpc/config.go
+++ b/lnrpc/routerrpc/config.go
@@ -69,6 +69,7 @@ func DefaultConfig() *Config {
 			NodeWeight: routing.DefaultBimodalNodeWeight,
 			DecayTime:  routing.DefaultBimodalDecayTime,
 		},
+		FeeEstimationTimeout: routing.DefaultFeeEstimationTimeout,
 	}
 
 	return &Config{
@@ -96,5 +97,6 @@ func GetRoutingConfig(cfg *Config) *RoutingConfig {
 			NodeWeight: cfg.BimodalConfig.NodeWeight,
 			DecayTime:  cfg.BimodalConfig.DecayTime,
 		},
+		FeeEstimationTimeout: cfg.FeeEstimationTimeout,
 	}
 }
diff --git a/lnrpc/routerrpc/router.pb.go b/lnrpc/routerrpc/router.pb.go
index 2b869b7eb..aa8d3ff82 100644
--- a/lnrpc/routerrpc/router.pb.go
+++ b/lnrpc/routerrpc/router.pb.go
@@ -800,10 +800,29 @@ type RouteFeeRequest struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	// The destination once wishes to obtain a routing fee quote to.
+	// The destination one wishes to obtain a routing fee quote to. If set, this
+	// parameter requires the amt_sat parameter also to be set. This parameter
+	// combination triggers a graph based routing fee estimation as opposed to a
+	// payment probe based estimate in case a payment request is provided. The
+	// graph based estimation is an algorithm that is executed on the in memory
+	// graph. Hence its runtime is significantly shorter than a payment probe
+	// estimation that sends out actual payments to the network.
 	Dest []byte `protobuf:"bytes,1,opt,name=dest,proto3" json:"dest,omitempty"`
-	// The amount one wishes to send to the target destination.
+	// The amount one wishes to send to the target destination. It is only to be
+	// used in combination with the dest parameter.
 	AmtSat int64 `protobuf:"varint,2,opt,name=amt_sat,json=amtSat,proto3" json:"amt_sat,omitempty"`
+	// A payment request of the target node that the route fee request is intended
+	// for. Its parameters are input to probe payments that estimate routing fees.
+	// The timeout parameter can be specified to set a maximum time on the probing
+	// attempt. Cannot be used in combination with dest and amt_sat.
+	PaymentRequest string `protobuf:"bytes,3,opt,name=payment_request,json=paymentRequest,proto3" json:"payment_request,omitempty"`
+	// A user preference of how long a probe payment should maximally be allowed to
+	// take, denoted in seconds. The probing payment loop is aborted if this
+	// timeout is reached. Note that the probing process itself can take longer
+	// than the timeout if the HTLC becomes delayed or stuck. Canceling the context
+	// of this call will not cancel the payment loop, the duration is only
+	// controlled by the timeout parameter.
+	Timeout uint32 `protobuf:"varint,4,opt,name=timeout,proto3" json:"timeout,omitempty"`
 }
 
 func (x *RouteFeeRequest) Reset() {
@@ -852,6 +871,20 @@ func (x *RouteFeeRequest) GetAmtSat() int64 {
 	return 0
 }
 
+func (x *RouteFeeRequest) GetPaymentRequest() string {
+	if x != nil {
+		return x.PaymentRequest
+	}
+	return ""
+}
+
+func (x *RouteFeeRequest) GetTimeout() uint32 {
+	if x != nil {
+		return x.Timeout
+	}
+	return 0
+}
+
 type RouteFeeResponse struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -864,6 +897,9 @@ type RouteFeeResponse struct {
 	// will still need to factor in the final CLTV delta of the last hop into this
 	// value.
 	TimeLockDelay int64 `protobuf:"varint,2,opt,name=time_lock_delay,json=timeLockDelay,proto3" json:"time_lock_delay,omitempty"`
+	// An indication whether a probing payment succeeded or whether and why it
+	// failed. FAILURE_REASON_NONE indicates success.
+	FailureReason lnrpc.PaymentFailureReason `protobuf:"varint,5,opt,name=failure_reason,json=failureReason,proto3,enum=lnrpc.PaymentFailureReason" json:"failure_reason,omitempty"`
 }
 
 func (x *RouteFeeResponse) Reset() {
@@ -912,6 +948,13 @@ func (x *RouteFeeResponse) GetTimeLockDelay() int64 {
 	return 0
 }
 
+func (x *RouteFeeResponse) GetFailureReason() lnrpc.PaymentFailureReason {
+	if x != nil {
+		return x.FailureReason
+	}
+	return lnrpc.PaymentFailureReason(0)
+}
+
 type SendToRouteRequest struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -3370,495 +3413,503 @@ var file_routerrpc_router_proto_rawDesc = []byte{
 	0x79, 0x6d, 0x65, 0x6e, 0x74, 0x73, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x12, 0x2e, 0x0a,
 	0x13, 0x6e, 0x6f, 0x5f, 0x69, 0x6e, 0x66, 0x6c, 0x69, 0x67, 0x68, 0x74, 0x5f, 0x75, 0x70, 0x64,
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 }
 
 var (
@@ -3927,90 +3978,92 @@ var file_routerrpc_router_proto_goTypes = []interface{}{
 	nil,                                        // 48: routerrpc.ForwardHtlcInterceptRequest.CustomRecordsEntry
 	(*lnrpc.RouteHint)(nil),                    // 49: lnrpc.RouteHint
 	(lnrpc.FeatureBit)(0),                      // 50: lnrpc.FeatureBit
-	(*lnrpc.Route)(nil),                        // 51: lnrpc.Route
-	(*lnrpc.Failure)(nil),                      // 52: lnrpc.Failure
-	(lnrpc.Failure_FailureCode)(0),             // 53: lnrpc.Failure.FailureCode
-	(*lnrpc.HTLCAttempt)(nil),                  // 54: lnrpc.HTLCAttempt
-	(*lnrpc.ChannelPoint)(nil),                 // 55: lnrpc.ChannelPoint
-	(*lnrpc.Payment)(nil),                      // 56: lnrpc.Payment
+	(lnrpc.PaymentFailureReason)(0),            // 51: lnrpc.PaymentFailureReason
+	(*lnrpc.Route)(nil),                        // 52: lnrpc.Route
+	(*lnrpc.Failure)(nil),                      // 53: lnrpc.Failure
+	(lnrpc.Failure_FailureCode)(0),             // 54: lnrpc.Failure.FailureCode
+	(*lnrpc.HTLCAttempt)(nil),                  // 55: lnrpc.HTLCAttempt
+	(*lnrpc.ChannelPoint)(nil),                 // 56: lnrpc.ChannelPoint
+	(*lnrpc.Payment)(nil),                      // 57: lnrpc.Payment
 }
 var file_routerrpc_router_proto_depIdxs = []int32{
 	49, // 0: routerrpc.SendPaymentRequest.route_hints:type_name -> lnrpc.RouteHint
 	47, // 1: routerrpc.SendPaymentRequest.dest_custom_records:type_name -> routerrpc.SendPaymentRequest.DestCustomRecordsEntry
 	50, // 2: routerrpc.SendPaymentRequest.dest_features:type_name -> lnrpc.FeatureBit
-	51, // 3: routerrpc.SendToRouteRequest.route:type_name -> lnrpc.Route
-	52, // 4: routerrpc.SendToRouteResponse.failure:type_name -> lnrpc.Failure
-	19, // 5: routerrpc.QueryMissionControlResponse.pairs:type_name -> routerrpc.PairHistory
-	19, // 6: routerrpc.XImportMissionControlRequest.pairs:type_name -> routerrpc.PairHistory
-	20, // 7: routerrpc.PairHistory.history:type_name -> routerrpc.PairData
-	25, // 8: routerrpc.GetMissionControlConfigResponse.config:type_name -> routerrpc.MissionControlConfig
-	25, // 9: routerrpc.SetMissionControlConfigRequest.config:type_name -> routerrpc.MissionControlConfig
-	4,  // 10: routerrpc.MissionControlConfig.model:type_name -> routerrpc.MissionControlConfig.ProbabilityModel
-	27, // 11: routerrpc.MissionControlConfig.apriori:type_name -> routerrpc.AprioriParameters
-	26, // 12: routerrpc.MissionControlConfig.bimodal:type_name -> routerrpc.BimodalParameters
-	20, // 13: routerrpc.QueryProbabilityResponse.history:type_name -> routerrpc.PairData
-	51, // 14: routerrpc.BuildRouteResponse.route:type_name -> lnrpc.Route
-	5,  // 15: routerrpc.HtlcEvent.event_type:type_name -> routerrpc.HtlcEvent.EventType
-	35, // 16: routerrpc.HtlcEvent.forward_event:type_name -> routerrpc.ForwardEvent
-	36, // 17: routerrpc.HtlcEvent.forward_fail_event:type_name -> routerrpc.ForwardFailEvent
-	37, // 18: routerrpc.HtlcEvent.settle_event:type_name -> routerrpc.SettleEvent
-	40, // 19: routerrpc.HtlcEvent.link_fail_event:type_name -> routerrpc.LinkFailEvent
-	39, // 20: routerrpc.HtlcEvent.subscribed_event:type_name -> routerrpc.SubscribedEvent
-	38, // 21: routerrpc.HtlcEvent.final_htlc_event:type_name -> routerrpc.FinalHtlcEvent
-	34, // 22: routerrpc.ForwardEvent.info:type_name -> routerrpc.HtlcInfo
-	34, // 23: routerrpc.LinkFailEvent.info:type_name -> routerrpc.HtlcInfo
-	53, // 24: routerrpc.LinkFailEvent.wire_failure:type_name -> lnrpc.Failure.FailureCode
-	0,  // 25: routerrpc.LinkFailEvent.failure_detail:type_name -> routerrpc.FailureDetail
-	1,  // 26: routerrpc.PaymentStatus.state:type_name -> routerrpc.PaymentState
-	54, // 27: routerrpc.PaymentStatus.htlcs:type_name -> lnrpc.HTLCAttempt
-	42, // 28: routerrpc.ForwardHtlcInterceptRequest.incoming_circuit_key:type_name -> routerrpc.CircuitKey
-	48, // 29: routerrpc.ForwardHtlcInterceptRequest.custom_records:type_name -> routerrpc.ForwardHtlcInterceptRequest.CustomRecordsEntry
-	42, // 30: routerrpc.ForwardHtlcInterceptResponse.incoming_circuit_key:type_name -> routerrpc.CircuitKey
-	2,  // 31: routerrpc.ForwardHtlcInterceptResponse.action:type_name -> routerrpc.ResolveHoldForwardAction
-	53, // 32: routerrpc.ForwardHtlcInterceptResponse.failure_code:type_name -> lnrpc.Failure.FailureCode
-	55, // 33: routerrpc.UpdateChanStatusRequest.chan_point:type_name -> lnrpc.ChannelPoint
-	3,  // 34: routerrpc.UpdateChanStatusRequest.action:type_name -> routerrpc.ChanStatusAction
-	6,  // 35: routerrpc.Router.SendPaymentV2:input_type -> routerrpc.SendPaymentRequest
-	7,  // 36: routerrpc.Router.TrackPaymentV2:input_type -> routerrpc.TrackPaymentRequest
-	8,  // 37: routerrpc.Router.TrackPayments:input_type -> routerrpc.TrackPaymentsRequest
-	9,  // 38: routerrpc.Router.EstimateRouteFee:input_type -> routerrpc.RouteFeeRequest
-	11, // 39: routerrpc.Router.SendToRoute:input_type -> routerrpc.SendToRouteRequest
-	11, // 40: routerrpc.Router.SendToRouteV2:input_type -> routerrpc.SendToRouteRequest
-	13, // 41: routerrpc.Router.ResetMissionControl:input_type -> routerrpc.ResetMissionControlRequest
-	15, // 42: routerrpc.Router.QueryMissionControl:input_type -> routerrpc.QueryMissionControlRequest
-	17, // 43: routerrpc.Router.XImportMissionControl:input_type -> routerrpc.XImportMissionControlRequest
-	21, // 44: routerrpc.Router.GetMissionControlConfig:input_type -> routerrpc.GetMissionControlConfigRequest
-	23, // 45: routerrpc.Router.SetMissionControlConfig:input_type -> routerrpc.SetMissionControlConfigRequest
-	28, // 46: routerrpc.Router.QueryProbability:input_type -> routerrpc.QueryProbabilityRequest
-	30, // 47: routerrpc.Router.BuildRoute:input_type -> routerrpc.BuildRouteRequest
-	32, // 48: routerrpc.Router.SubscribeHtlcEvents:input_type -> routerrpc.SubscribeHtlcEventsRequest
-	6,  // 49: routerrpc.Router.SendPayment:input_type -> routerrpc.SendPaymentRequest
-	7,  // 50: routerrpc.Router.TrackPayment:input_type -> routerrpc.TrackPaymentRequest
-	44, // 51: routerrpc.Router.HtlcInterceptor:input_type -> routerrpc.ForwardHtlcInterceptResponse
-	45, // 52: routerrpc.Router.UpdateChanStatus:input_type -> routerrpc.UpdateChanStatusRequest
-	56, // 53: routerrpc.Router.SendPaymentV2:output_type -> lnrpc.Payment
-	56, // 54: routerrpc.Router.TrackPaymentV2:output_type -> lnrpc.Payment
-	56, // 55: routerrpc.Router.TrackPayments:output_type -> lnrpc.Payment
-	10, // 56: routerrpc.Router.EstimateRouteFee:output_type -> routerrpc.RouteFeeResponse
-	12, // 57: routerrpc.Router.SendToRoute:output_type -> routerrpc.SendToRouteResponse
-	54, // 58: routerrpc.Router.SendToRouteV2:output_type -> lnrpc.HTLCAttempt
-	14, // 59: routerrpc.Router.ResetMissionControl:output_type -> routerrpc.ResetMissionControlResponse
-	16, // 60: routerrpc.Router.QueryMissionControl:output_type -> routerrpc.QueryMissionControlResponse
-	18, // 61: routerrpc.Router.XImportMissionControl:output_type -> routerrpc.XImportMissionControlResponse
-	22, // 62: routerrpc.Router.GetMissionControlConfig:output_type -> routerrpc.GetMissionControlConfigResponse
-	24, // 63: routerrpc.Router.SetMissionControlConfig:output_type -> routerrpc.SetMissionControlConfigResponse
-	29, // 64: routerrpc.Router.QueryProbability:output_type -> routerrpc.QueryProbabilityResponse
-	31, // 65: routerrpc.Router.BuildRoute:output_type -> routerrpc.BuildRouteResponse
-	33, // 66: routerrpc.Router.SubscribeHtlcEvents:output_type -> routerrpc.HtlcEvent
-	41, // 67: routerrpc.Router.SendPayment:output_type -> routerrpc.PaymentStatus
-	41, // 68: routerrpc.Router.TrackPayment:output_type -> routerrpc.PaymentStatus
-	43, // 69: routerrpc.Router.HtlcInterceptor:output_type -> routerrpc.ForwardHtlcInterceptRequest
-	46, // 70: routerrpc.Router.UpdateChanStatus:output_type -> routerrpc.UpdateChanStatusResponse
-	53, // [53:71] is the sub-list for method output_type
-	35, // [35:53] is the sub-list for method input_type
-	35, // [35:35] is the sub-list for extension type_name
-	35, // [35:35] is the sub-list for extension extendee
-	0,  // [0:35] is the sub-list for field type_name
+	51, // 3: routerrpc.RouteFeeResponse.failure_reason:type_name -> lnrpc.PaymentFailureReason
+	52, // 4: routerrpc.SendToRouteRequest.route:type_name -> lnrpc.Route
+	53, // 5: routerrpc.SendToRouteResponse.failure:type_name -> lnrpc.Failure
+	19, // 6: routerrpc.QueryMissionControlResponse.pairs:type_name -> routerrpc.PairHistory
+	19, // 7: routerrpc.XImportMissionControlRequest.pairs:type_name -> routerrpc.PairHistory
+	20, // 8: routerrpc.PairHistory.history:type_name -> routerrpc.PairData
+	25, // 9: routerrpc.GetMissionControlConfigResponse.config:type_name -> routerrpc.MissionControlConfig
+	25, // 10: routerrpc.SetMissionControlConfigRequest.config:type_name -> routerrpc.MissionControlConfig
+	4,  // 11: routerrpc.MissionControlConfig.model:type_name -> routerrpc.MissionControlConfig.ProbabilityModel
+	27, // 12: routerrpc.MissionControlConfig.apriori:type_name -> routerrpc.AprioriParameters
+	26, // 13: routerrpc.MissionControlConfig.bimodal:type_name -> routerrpc.BimodalParameters
+	20, // 14: routerrpc.QueryProbabilityResponse.history:type_name -> routerrpc.PairData
+	52, // 15: routerrpc.BuildRouteResponse.route:type_name -> lnrpc.Route
+	5,  // 16: routerrpc.HtlcEvent.event_type:type_name -> routerrpc.HtlcEvent.EventType
+	35, // 17: routerrpc.HtlcEvent.forward_event:type_name -> routerrpc.ForwardEvent
+	36, // 18: routerrpc.HtlcEvent.forward_fail_event:type_name -> routerrpc.ForwardFailEvent
+	37, // 19: routerrpc.HtlcEvent.settle_event:type_name -> routerrpc.SettleEvent
+	40, // 20: routerrpc.HtlcEvent.link_fail_event:type_name -> routerrpc.LinkFailEvent
+	39, // 21: routerrpc.HtlcEvent.subscribed_event:type_name -> routerrpc.SubscribedEvent
+	38, // 22: routerrpc.HtlcEvent.final_htlc_event:type_name -> routerrpc.FinalHtlcEvent
+	34, // 23: routerrpc.ForwardEvent.info:type_name -> routerrpc.HtlcInfo
+	34, // 24: routerrpc.LinkFailEvent.info:type_name -> routerrpc.HtlcInfo
+	54, // 25: routerrpc.LinkFailEvent.wire_failure:type_name -> lnrpc.Failure.FailureCode
+	0,  // 26: routerrpc.LinkFailEvent.failure_detail:type_name -> routerrpc.FailureDetail
+	1,  // 27: routerrpc.PaymentStatus.state:type_name -> routerrpc.PaymentState
+	55, // 28: routerrpc.PaymentStatus.htlcs:type_name -> lnrpc.HTLCAttempt
+	42, // 29: routerrpc.ForwardHtlcInterceptRequest.incoming_circuit_key:type_name -> routerrpc.CircuitKey
+	48, // 30: routerrpc.ForwardHtlcInterceptRequest.custom_records:type_name -> routerrpc.ForwardHtlcInterceptRequest.CustomRecordsEntry
+	42, // 31: routerrpc.ForwardHtlcInterceptResponse.incoming_circuit_key:type_name -> routerrpc.CircuitKey
+	2,  // 32: routerrpc.ForwardHtlcInterceptResponse.action:type_name -> routerrpc.ResolveHoldForwardAction
+	54, // 33: routerrpc.ForwardHtlcInterceptResponse.failure_code:type_name -> lnrpc.Failure.FailureCode
+	56, // 34: routerrpc.UpdateChanStatusRequest.chan_point:type_name -> lnrpc.ChannelPoint
+	3,  // 35: routerrpc.UpdateChanStatusRequest.action:type_name -> routerrpc.ChanStatusAction
+	6,  // 36: routerrpc.Router.SendPaymentV2:input_type -> routerrpc.SendPaymentRequest
+	7,  // 37: routerrpc.Router.TrackPaymentV2:input_type -> routerrpc.TrackPaymentRequest
+	8,  // 38: routerrpc.Router.TrackPayments:input_type -> routerrpc.TrackPaymentsRequest
+	9,  // 39: routerrpc.Router.EstimateRouteFee:input_type -> routerrpc.RouteFeeRequest
+	11, // 40: routerrpc.Router.SendToRoute:input_type -> routerrpc.SendToRouteRequest
+	11, // 41: routerrpc.Router.SendToRouteV2:input_type -> routerrpc.SendToRouteRequest
+	13, // 42: routerrpc.Router.ResetMissionControl:input_type -> routerrpc.ResetMissionControlRequest
+	15, // 43: routerrpc.Router.QueryMissionControl:input_type -> routerrpc.QueryMissionControlRequest
+	17, // 44: routerrpc.Router.XImportMissionControl:input_type -> routerrpc.XImportMissionControlRequest
+	21, // 45: routerrpc.Router.GetMissionControlConfig:input_type -> routerrpc.GetMissionControlConfigRequest
+	23, // 46: routerrpc.Router.SetMissionControlConfig:input_type -> routerrpc.SetMissionControlConfigRequest
+	28, // 47: routerrpc.Router.QueryProbability:input_type -> routerrpc.QueryProbabilityRequest
+	30, // 48: routerrpc.Router.BuildRoute:input_type -> routerrpc.BuildRouteRequest
+	32, // 49: routerrpc.Router.SubscribeHtlcEvents:input_type -> routerrpc.SubscribeHtlcEventsRequest
+	6,  // 50: routerrpc.Router.SendPayment:input_type -> routerrpc.SendPaymentRequest
+	7,  // 51: routerrpc.Router.TrackPayment:input_type -> routerrpc.TrackPaymentRequest
+	44, // 52: routerrpc.Router.HtlcInterceptor:input_type -> routerrpc.ForwardHtlcInterceptResponse
+	45, // 53: routerrpc.Router.UpdateChanStatus:input_type -> routerrpc.UpdateChanStatusRequest
+	57, // 54: routerrpc.Router.SendPaymentV2:output_type -> lnrpc.Payment
+	57, // 55: routerrpc.Router.TrackPaymentV2:output_type -> lnrpc.Payment
+	57, // 56: routerrpc.Router.TrackPayments:output_type -> lnrpc.Payment
+	10, // 57: routerrpc.Router.EstimateRouteFee:output_type -> routerrpc.RouteFeeResponse
+	12, // 58: routerrpc.Router.SendToRoute:output_type -> routerrpc.SendToRouteResponse
+	55, // 59: routerrpc.Router.SendToRouteV2:output_type -> lnrpc.HTLCAttempt
+	14, // 60: routerrpc.Router.ResetMissionControl:output_type -> routerrpc.ResetMissionControlResponse
+	16, // 61: routerrpc.Router.QueryMissionControl:output_type -> routerrpc.QueryMissionControlResponse
+	18, // 62: routerrpc.Router.XImportMissionControl:output_type -> routerrpc.XImportMissionControlResponse
+	22, // 63: routerrpc.Router.GetMissionControlConfig:output_type -> routerrpc.GetMissionControlConfigResponse
+	24, // 64: routerrpc.Router.SetMissionControlConfig:output_type -> routerrpc.SetMissionControlConfigResponse
+	29, // 65: routerrpc.Router.QueryProbability:output_type -> routerrpc.QueryProbabilityResponse
+	31, // 66: routerrpc.Router.BuildRoute:output_type -> routerrpc.BuildRouteResponse
+	33, // 67: routerrpc.Router.SubscribeHtlcEvents:output_type -> routerrpc.HtlcEvent
+	41, // 68: routerrpc.Router.SendPayment:output_type -> routerrpc.PaymentStatus
+	41, // 69: routerrpc.Router.TrackPayment:output_type -> routerrpc.PaymentStatus
+	43, // 70: routerrpc.Router.HtlcInterceptor:output_type -> routerrpc.ForwardHtlcInterceptRequest
+	46, // 71: routerrpc.Router.UpdateChanStatus:output_type -> routerrpc.UpdateChanStatusResponse
+	54, // [54:72] is the sub-list for method output_type
+	36, // [36:54] is the sub-list for method input_type
+	36, // [36:36] is the sub-list for extension type_name
+	36, // [36:36] is the sub-list for extension extendee
+	0,  // [0:36] is the sub-list for field type_name
 }
 
 func init() { file_routerrpc_router_proto_init() }
diff --git a/lnrpc/routerrpc/router.proto b/lnrpc/routerrpc/router.proto
index de57bfaa2..a90982880 100644
--- a/lnrpc/routerrpc/router.proto
+++ b/lnrpc/routerrpc/router.proto
@@ -353,14 +353,39 @@ message TrackPaymentsRequest {
 
 message RouteFeeRequest {
     /*
-    The destination once wishes to obtain a routing fee quote to.
+    The destination one wishes to obtain a routing fee quote to. If set, this
+    parameter requires the amt_sat parameter also to be set. This parameter
+    combination triggers a graph based routing fee estimation as opposed to a
+    payment probe based estimate in case a payment request is provided. The
+    graph based estimation is an algorithm that is executed on the in memory
+    graph. Hence its runtime is significantly shorter than a payment probe
+    estimation that sends out actual payments to the network.
     */
     bytes dest = 1;
 
     /*
-    The amount one wishes to send to the target destination.
+    The amount one wishes to send to the target destination. It is only to be
+    used in combination with the dest parameter.
     */
     int64 amt_sat = 2;
+
+    /*
+    A payment request of the target node that the route fee request is intended
+    for. Its parameters are input to probe payments that estimate routing fees.
+    The timeout parameter can be specified to set a maximum time on the probing
+    attempt. Cannot be used in combination with dest and amt_sat.
+    */
+    string payment_request = 3;
+
+    /*
+    A user preference of how long a probe payment should maximally be allowed to
+    take, denoted in seconds. The probing payment loop is aborted if this
+    timeout is reached. Note that the probing process itself can take longer
+    than the timeout if the HTLC becomes delayed or stuck. Canceling the context
+    of this call will not cancel the payment loop, the duration is only
+    controlled by the timeout parameter.
+    */
+    uint32 timeout = 4;
 }
 
 message RouteFeeResponse {
@@ -376,6 +401,12 @@ message RouteFeeResponse {
     value.
     */
     int64 time_lock_delay = 2;
+
+    /*
+    An indication whether a probing payment succeeded or whether and why it
+    failed. FAILURE_REASON_NONE indicates success.
+    */
+    lnrpc.PaymentFailureReason failure_reason = 5;
 }
 
 message SendToRouteRequest {
diff --git a/lnrpc/routerrpc/router.swagger.json b/lnrpc/routerrpc/router.swagger.json
index 2a163d030..8e1c646c1 100644
--- a/lnrpc/routerrpc/router.swagger.json
+++ b/lnrpc/routerrpc/router.swagger.json
@@ -1642,12 +1642,21 @@
         "dest": {
           "type": "string",
           "format": "byte",
-          "description": "The destination once wishes to obtain a routing fee quote to."
+          "description": "The destination one wishes to obtain a routing fee quote to. If set, this\nparameter requires the amt_sat parameter also to be set. This parameter\ncombination triggers a graph based routing fee estimation as opposed to a\npayment probe based estimate in case a payment request is provided. The\ngraph based estimation is an algorithm that is executed on the in memory\ngraph. Hence its runtime is significantly shorter than a payment probe\nestimation that sends out actual payments to the network."
         },
         "amt_sat": {
           "type": "string",
           "format": "int64",
-          "description": "The amount one wishes to send to the target destination."
+          "description": "The amount one wishes to send to the target destination. It is only to be\nused in combination with the dest parameter."
+        },
+        "payment_request": {
+          "type": "string",
+          "description": "A payment request of the target node that the route fee request is intended\nfor. Its parameters are input to probe payments that estimate routing fees.\nThe timeout parameter can be specified to set a maximum time on the probing\nattempt. Cannot be used in combination with dest and amt_sat."
+        },
+        "timeout": {
+          "type": "integer",
+          "format": "int64",
+          "description": "A user preference of how long a probe payment should maximally be allowed to\ntake, denoted in seconds. The probing payment loop is aborted if this\ntimeout is reached. Note that the probing process itself can take longer\nthan the timeout if the HTLC becomes delayed or stuck. Canceling the context\nof this call will not cancel the payment loop, the duration is only\ncontrolled by the timeout parameter."
         }
       }
     },
@@ -1663,6 +1672,10 @@
           "type": "string",
           "format": "int64",
           "description": "An estimate of the worst case time delay that can occur. Note that callers\nwill still need to factor in the final CLTV delta of the last hop into this\nvalue."
+        },
+        "failure_reason": {
+          "$ref": "#/definitions/lnrpcPaymentFailureReason",
+          "description": "An indication whether a probing payment succeeded or whether and why it\nfailed. FAILURE_REASON_NONE indicates success."
         }
       }
     },
diff --git a/lnrpc/routerrpc/router_backend.go b/lnrpc/routerrpc/router_backend.go
index 4d82c72e4..64dd6917f 100644
--- a/lnrpc/routerrpc/router_backend.go
+++ b/lnrpc/routerrpc/router_backend.go
@@ -1175,8 +1175,18 @@ func unmarshallHopHint(rpcHint *lnrpc.HopHint) (zpay32.HopHint, error) {
 	}, nil
 }
 
+// MarshalFeatures converts a feature vector into a list of uint32's.
+func MarshalFeatures(feats *lnwire.FeatureVector) []lnrpc.FeatureBit {
+	var featureBits []lnrpc.FeatureBit
+	for feature := range feats.Features() {
+		featureBits = append(featureBits, lnrpc.FeatureBit(feature))
+	}
+
+	return featureBits
+}
+
 // UnmarshalFeatures converts a list of uint32's into a valid feature vector.
-// This method checks that feature bit pairs aren't assigned toegether, and
+// This method checks that feature bit pairs aren't assigned together, and
 // validates transitive dependencies.
 func UnmarshalFeatures(
 	rpcFeatures []lnrpc.FeatureBit) (*lnwire.FeatureVector, error) {
diff --git a/lnrpc/routerrpc/router_server.go b/lnrpc/routerrpc/router_server.go
index 84bfa68ef..7ed683f24 100644
--- a/lnrpc/routerrpc/router_server.go
+++ b/lnrpc/routerrpc/router_server.go
@@ -1,7 +1,9 @@
 package routerrpc
 
 import (
+	"bytes"
 	"context"
+	crand "crypto/rand"
 	"errors"
 	"fmt"
 	"io/ioutil"
@@ -15,11 +17,13 @@ import (
 	"github.com/grpc-ecosystem/grpc-gateway/v2/runtime"
 	"github.com/lightningnetwork/lnd/channeldb"
 	"github.com/lightningnetwork/lnd/lnrpc"
+	"github.com/lightningnetwork/lnd/lnrpc/invoicesrpc"
 	"github.com/lightningnetwork/lnd/lntypes"
 	"github.com/lightningnetwork/lnd/lnwire"
 	"github.com/lightningnetwork/lnd/macaroons"
 	"github.com/lightningnetwork/lnd/routing"
 	"github.com/lightningnetwork/lnd/routing/route"
+	"github.com/lightningnetwork/lnd/zpay32"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/status"
@@ -31,16 +35,26 @@ const (
 	// to register ourselves, and we also require that the main
 	// SubServerConfigDispatcher instance recognize as the name of our
 	subServerName = "RouterRPC"
+
+	// routeFeeLimitSat is the maximum routing fee that we allow to occur
+	// when estimating a routing fee.
+	routeFeeLimitSat = 100_000_000
 )
 
 var (
 	errServerShuttingDown = errors.New("routerrpc server shutting down")
 
-	// ErrInterceptorAlreadyExists is an error returned when the a new stream
-	// is opened and there is already one active interceptor.
-	// The user must disconnect prior to open another stream.
+	// ErrInterceptorAlreadyExists is an error returned when a new stream is
+	// opened and there is already one active interceptor. The user must
+	// disconnect prior to open another stream.
 	ErrInterceptorAlreadyExists = errors.New("interceptor already exists")
 
+	errMissingPaymentAttempt = errors.New("missing payment attempt")
+
+	errMissingRoute = errors.New("missing route")
+
+	errUnexpectedFailureSource = errors.New("unexpected failure source")
+
 	// macaroonOps are the set of capabilities that our minted macaroon (if
 	// it doesn't already exist) will have.
 	macaroonOps = []bakery.Op{
@@ -356,25 +370,58 @@ func (s *Server) SendPaymentV2(req *SendPaymentRequest,
 	)
 }
 
-// EstimateRouteFee allows callers to obtain a lower bound w.r.t how much it
-// may cost to send an HTLC to the target end destination.
+// EstimateRouteFee allows callers to obtain an expected value w.r.t how much it
+// may cost to send an HTLC to the target end destination. This method sends
+// probe payments to the target node, based on target invoice parameters and a
+// random payment hash that makes it impossible for the target to settle the
+// htlc. The probing stops if a user-provided timeout is reached. If provided
+// with a destination key and amount, this method will perform a local graph
+// based fee estimation.
 func (s *Server) EstimateRouteFee(ctx context.Context,
 	req *RouteFeeRequest) (*RouteFeeResponse, error) {
 
-	if len(req.Dest) != 33 {
-		return nil, errors.New("invalid length destination key")
+	isProbeDestination := len(req.Dest) > 0
+	isProbeInvoice := len(req.PaymentRequest) > 0
+
+	switch {
+	case isProbeDestination == isProbeInvoice:
+		return nil, errors.New("specify either a destination or an " +
+			"invoice")
+
+	case isProbeDestination:
+		switch {
+		case len(req.Dest) != 33:
+			return nil, errors.New("invalid length destination key")
+
+		case req.AmtSat <= 0:
+			return nil, errors.New("amount must be greater than 0")
+
+		default:
+			return s.probeDestination(req.Dest, req.AmtSat)
+		}
+
+	case isProbeInvoice:
+		return s.probePaymentRequest(
+			ctx, req.PaymentRequest, req.Timeout,
+		)
+	}
+
+	return &RouteFeeResponse{}, nil
+}
+
+// probeDestination estimates fees along a route to a destination based on the
+// contents of the local graph.
+func (s *Server) probeDestination(dest []byte, amtSat int64) (*RouteFeeResponse,
+	error) {
+
+	destNode, err := route.NewVertexFromBytes(dest)
+	if err != nil {
+		return nil, err
 	}
-	var destNode route.Vertex
-	copy(destNode[:], req.Dest)
 
 	// Next, we'll convert the amount in satoshis to mSAT, which are the
 	// native unit of LN.
-	amtMsat := lnwire.NewMSatFromSatoshis(btcutil.Amount(req.AmtSat))
-
-	// Pick a fee limit
-	//
-	// TODO: Change this into behaviour that makes more sense.
-	feeLimit := lnwire.NewMSatFromSatoshis(btcutil.SatoshiPerBitcoin)
+	amtMsat := lnwire.NewMSatFromSatoshis(btcutil.Amount(amtSat))
 
 	// Finally, we'll query for a route to the destination that can carry
 	// that target amount, we'll only request a single route. Set a
@@ -384,7 +431,7 @@ func (s *Server) EstimateRouteFee(ctx context.Context,
 	routeReq, err := routing.NewRouteRequest(
 		s.cfg.RouterBackend.SelfNode, &destNode, amtMsat, 0,
 		&routing.RestrictParams{
-			FeeLimit:          feeLimit,
+			FeeLimit:          routeFeeLimitSat,
 			CltvLimit:         s.cfg.RouterBackend.MaxTotalTimelock,
 			ProbabilitySource: mc.GetProbability,
 		}, nil, nil, nil, s.cfg.RouterBackend.DefaultFinalCltvDelta,
@@ -398,14 +445,379 @@ func (s *Server) EstimateRouteFee(ctx context.Context,
 		return nil, err
 	}
 
+	// We are adding a block padding to the total time lock to account for
+	// the safety buffer that the payment session will add to the last hop's
+	// cltv delta. This is to prevent the htlc from failing if blocks are
+	// mined while it is in flight.
+	timeLockDelay := route.TotalTimeLock + uint32(routing.BlockPadding)
+
 	return &RouteFeeResponse{
 		RoutingFeeMsat: int64(route.TotalFees()),
-		TimeLockDelay:  int64(route.TotalTimeLock),
+		TimeLockDelay:  int64(timeLockDelay),
+		FailureReason:  lnrpc.PaymentFailureReason_FAILURE_REASON_NONE,
 	}, nil
 }
 
-// SendToRouteV2 sends a payment through a predefined route. The response of this
-// call contains structured error information.
+// probePaymentRequest estimates fees along a route to a destination that is
+// specified in an invoice. The estimation duration is limited by a timeout. In
+// case that route hints are provided, this method applies a heuristic to
+// identify LSPs which might block probe payments. In that case, fees are
+// manually calculated and added to the probed fee estimation up until the LSP
+// node. If the route hints don't indicate an LSP, they are passed as arguments
+// to the SendPayment_V2 method, which enable it to send probe payments to the
+// payment request destination.
+func (s *Server) probePaymentRequest(ctx context.Context, paymentRequest string,
+	timeout uint32) (*RouteFeeResponse, error) {
+
+	payReq, err := zpay32.Decode(
+		paymentRequest, s.cfg.RouterBackend.ActiveNetParams,
+	)
+	if err != nil {
+		return nil, err
+	}
+
+	if *payReq.MilliSat <= 0 {
+		return nil, errors.New("payment request amount must be " +
+			"greater than 0")
+	}
+
+	// Generate random payment hash, so we can be sure that the target of
+	// the probe payment doesn't have the preimage to settle the htlc.
+	var paymentHash lntypes.Hash
+	_, err = crand.Read(paymentHash[:])
+	if err != nil {
+		return nil, fmt.Errorf("cannot generate random probe "+
+			"preimage: %w", err)
+	}
+
+	amtMsat := int64(*payReq.MilliSat)
+	probeRequest := &SendPaymentRequest{
+		TimeoutSeconds:   int32(timeout),
+		Dest:             payReq.Destination.SerializeCompressed(),
+		MaxParts:         1,
+		AllowSelfPayment: false,
+		AmtMsat:          amtMsat,
+		PaymentHash:      paymentHash[:],
+		FeeLimitSat:      routeFeeLimitSat,
+		PaymentAddr:      payReq.PaymentAddr[:],
+		FinalCltvDelta:   int32(payReq.MinFinalCLTVExpiry()),
+		DestFeatures:     MarshalFeatures(payReq.Features),
+	}
+
+	hints := payReq.RouteHints
+
+	// If the hints don't indicate an LSP then chances are that our probe
+	// payment won't be blocked along the route to the destination. We send
+	// a probe payment with unmodified route hints.
+	if !isLSP(hints) {
+		probeRequest.RouteHints = invoicesrpc.CreateRPCRouteHints(hints)
+		return s.sendProbePayment(ctx, probeRequest)
+	}
+
+	// If the heuristic indicates an LSP we modify the route hints to allow
+	// probing the LSP.
+	lspAdjustedRouteHints, lspHint, err := prepareLspRouteHints(
+		hints, *payReq.MilliSat,
+	)
+	if err != nil {
+		return nil, err
+	}
+
+	// The adjusted route hints serve the payment probe to find the last
+	// public hop to the LSP on the route.
+	probeRequest.Dest = lspHint.NodeID.SerializeCompressed()
+	if len(lspAdjustedRouteHints) > 0 {
+		probeRequest.RouteHints = invoicesrpc.CreateRPCRouteHints(
+			lspAdjustedRouteHints,
+		)
+	}
+
+	// The payment probe will be able to calculate the fee up until the LSP
+	// node. The fee of the last hop has to be calculated manually. Since
+	// the last hop's fee amount has to be sent across the payment path we
+	// have to add it to the original payment amount. Only then will the
+	// payment probe be able to determine the correct fee to the last hop
+	// prior to the private destination. For example, if the user wants to
+	// send 1000 sats to a private destination and the last hop's fee is 10
+	// sats, then 1010 sats will have to arrive at the last hop. This means
+	// that the probe has to be dispatched with 1010 sats to correctly
+	// calculate the routing fee.
+	//
+	// Calculate the hop fee for the last hop manually.
+	hopFee := lspHint.HopFee(*payReq.MilliSat)
+	if err != nil {
+		return nil, err
+	}
+
+	// Add the last hop's fee to the requested payment amount that we want
+	// to get an estimate for.
+	probeRequest.AmtMsat += int64(hopFee)
+
+	// Use the hop hint's cltv delta as the payment request's final cltv
+	// delta. The actual final cltv delta of the invoice will be added to
+	// the payment probe's cltv delta.
+	probeRequest.FinalCltvDelta = int32(lspHint.CLTVExpiryDelta)
+
+	// Dispatch the payment probe with adjusted fee amount.
+	resp, err := s.sendProbePayment(ctx, probeRequest)
+	if err != nil {
+		return nil, err
+	}
+
+	// If the payment probe failed we only return the failure reason and
+	// leave the probe result params unaltered.
+	if resp.FailureReason != lnrpc.PaymentFailureReason_FAILURE_REASON_NONE { //nolint:lll
+		return resp, nil
+	}
+
+	// The probe succeeded, so we can add the last hop's fee to fee the
+	// payment probe returned.
+	resp.RoutingFeeMsat += int64(hopFee)
+
+	// Add the final cltv delta of the invoice to the payment probe's total
+	// cltv delta. This is the cltv delta for the hop behind the LSP.
+	resp.TimeLockDelay += int64(payReq.MinFinalCLTVExpiry())
+
+	return resp, nil
+}
+
+// isLSP checks if the route hints indicate an LSP. An LSP is indicated with
+// true if the last node in each route hint has the same node id, false
+// otherwise.
+func isLSP(routeHints [][]zpay32.HopHint) bool {
+	if len(routeHints) == 0 || len(routeHints[0]) == 0 {
+		return false
+	}
+
+	refNodeID := routeHints[0][len(routeHints[0])-1].NodeID
+	for i := 1; i < len(routeHints); i++ {
+		// Skip empty route hints.
+		if len(routeHints[i]) == 0 {
+			continue
+		}
+
+		lastHop := routeHints[i][len(routeHints[i])-1]
+		idMatchesRefNode := bytes.Equal(
+			lastHop.NodeID.SerializeCompressed(),
+			refNodeID.SerializeCompressed(),
+		)
+		if !idMatchesRefNode {
+			return false
+		}
+	}
+
+	return true
+}
+
+// prepareLspRouteHints assumes that the isLsp heuristic returned true for the
+// route hints passed in here. It constructs a modified list of route hints that
+// allows the caller to probe the LSP, which itself is returned as a separate
+// hop hint.
+func prepareLspRouteHints(routeHints [][]zpay32.HopHint,
+	amt lnwire.MilliSatoshi) ([][]zpay32.HopHint, *zpay32.HopHint, error) {
+
+	if len(routeHints) == 0 {
+		return nil, nil, fmt.Errorf("no route hints provided")
+	}
+
+	// Create the LSP hop hint. We are probing for the worst case fee and
+	// cltv delta. So we look for the max values amongst all LSP hop hints.
+	refHint := routeHints[0][len(routeHints[0])-1]
+	refHint.CLTVExpiryDelta = maxLspCltvDelta(routeHints)
+	refHint.FeeBaseMSat, refHint.FeeProportionalMillionths = maxLspFee(
+		routeHints, amt,
+	)
+
+	// We construct a modified list of route hints that allows the caller to
+	// probe the LSP.
+	adjustedHints := make([][]zpay32.HopHint, 0, len(routeHints))
+
+	// Strip off the LSP hop hint from all route hints.
+	for i := 0; i < len(routeHints); i++ {
+		hint := routeHints[i]
+		if len(hint) > 1 {
+			adjustedHints = append(
+				adjustedHints, hint[:len(hint)-1],
+			)
+		}
+	}
+
+	return adjustedHints, &refHint, nil
+}
+
+// maxLspFee returns base fee and fee rate amongst all LSP route hints that
+// results in the overall highest fee for the given amount.
+func maxLspFee(routeHints [][]zpay32.HopHint, amt lnwire.MilliSatoshi) (uint32,
+	uint32) {
+
+	var maxFeePpm uint32
+	var maxBaseFee uint32
+	var maxTotalFee lnwire.MilliSatoshi
+	for _, rh := range routeHints {
+		lastHop := rh[len(rh)-1]
+		lastHopFee := lastHop.HopFee(amt)
+		if lastHopFee > maxTotalFee {
+			maxTotalFee = lastHopFee
+			maxBaseFee = lastHop.FeeBaseMSat
+			maxFeePpm = lastHop.FeeProportionalMillionths
+		}
+	}
+
+	return maxBaseFee, maxFeePpm
+}
+
+// maxLspCltvDelta returns the maximum cltv delta amongst all LSP route hints.
+func maxLspCltvDelta(routeHints [][]zpay32.HopHint) uint16 {
+	var maxCltvDelta uint16
+	for _, rh := range routeHints {
+		rhLastHop := rh[len(rh)-1]
+		if rhLastHop.CLTVExpiryDelta > maxCltvDelta {
+			maxCltvDelta = rhLastHop.CLTVExpiryDelta
+		}
+	}
+
+	return maxCltvDelta
+}
+
+// probePaymentStream is a custom implementation of the grpc.ServerStream
+// interface. It is used to send payment status updates to the caller on the
+// stream channel.
+type probePaymentStream struct {
+	Router_SendPaymentV2Server
+
+	stream chan *lnrpc.Payment
+	ctx    context.Context //nolint:containedctx
+}
+
+// Send sends a payment status update to a payment stream that the caller can
+// evaluate.
+func (p *probePaymentStream) Send(response *lnrpc.Payment) error {
+	select {
+	case p.stream <- response:
+
+	case <-p.ctx.Done():
+		return p.ctx.Err()
+	}
+
+	return nil
+}
+
+// Context returns the context of the stream.
+func (p *probePaymentStream) Context() context.Context {
+	return p.ctx
+}
+
+// sendProbePayment sends a payment to a target node in order to obtain
+// potential routing fees for it. The payment request has to contain a payment
+// hash that is guaranteed to be unknown to the target node, so it cannot settle
+// the payment. This method invokes a payment request loop in a goroutine and
+// awaits payment status updates.
+func (s *Server) sendProbePayment(ctx context.Context,
+	req *SendPaymentRequest) (*RouteFeeResponse, error) {
+
+	// We'll launch a goroutine to send the payment probes.
+	errChan := make(chan error, 1)
+	defer close(errChan)
+
+	paymentStream := &probePaymentStream{
+		stream: make(chan *lnrpc.Payment),
+		ctx:    ctx,
+	}
+	go func() {
+		err := s.SendPaymentV2(req, paymentStream)
+		if err != nil {
+			select {
+			case errChan <- err:
+
+			case <-paymentStream.ctx.Done():
+				return
+			}
+		}
+	}()
+
+	for {
+		select {
+		case payment := <-paymentStream.stream:
+			switch payment.Status {
+			case lnrpc.Payment_INITIATED:
+			case lnrpc.Payment_IN_FLIGHT:
+			case lnrpc.Payment_SUCCEEDED:
+				return nil, errors.New("warning, the fee " +
+					"estimation payment probe " +
+					"unexpectedly succeeded. Please reach" +
+					"out to the probe destination to " +
+					"negotiate a refund. Otherwise the " +
+					"payment probe amount is lost forever")
+
+			case lnrpc.Payment_FAILED:
+				// Incorrect payment details point to a
+				// successful probe.
+				//nolint:lll
+				if payment.FailureReason == lnrpc.PaymentFailureReason_FAILURE_REASON_INCORRECT_PAYMENT_DETAILS {
+					return paymentDetails(payment)
+				}
+
+				return &RouteFeeResponse{
+					RoutingFeeMsat: 0,
+					TimeLockDelay:  0,
+					FailureReason:  payment.FailureReason,
+				}, nil
+
+			default:
+				return nil, errors.New("unexpected payment " +
+					"status")
+			}
+
+		case err := <-errChan:
+			return nil, err
+
+		case <-s.quit:
+			return nil, errServerShuttingDown
+		}
+	}
+}
+
+func paymentDetails(payment *lnrpc.Payment) (*RouteFeeResponse, error) {
+	fee, timeLock, err := timelockAndFee(payment)
+	if errors.Is(err, errUnexpectedFailureSource) {
+		return nil, err
+	}
+
+	return &RouteFeeResponse{
+		RoutingFeeMsat: fee,
+		TimeLockDelay:  timeLock,
+		FailureReason:  lnrpc.PaymentFailureReason_FAILURE_REASON_NONE,
+	}, nil
+}
+
+// timelockAndFee returns the fee and total time lock of the last payment
+// attempt.
+func timelockAndFee(p *lnrpc.Payment) (int64, int64, error) {
+	if len(p.Htlcs) == 0 {
+		return 0, 0, nil
+	}
+
+	lastAttempt := p.Htlcs[len(p.Htlcs)-1]
+	if lastAttempt == nil {
+		return 0, 0, errMissingPaymentAttempt
+	}
+
+	lastRoute := lastAttempt.Route
+	if lastRoute == nil {
+		return 0, 0, errMissingRoute
+	}
+
+	hopFailureIndex := lastAttempt.Failure.FailureSourceIndex
+	finalHopIndex := uint32(len(lastRoute.Hops))
+	if hopFailureIndex != finalHopIndex {
+		return 0, 0, errUnexpectedFailureSource
+	}
+
+	return lastRoute.TotalFeesMsat, int64(lastRoute.TotalTimeLock), nil
+}
+
+// SendToRouteV2 sends a payment through a predefined route. The response of
+// this call contains structured error information.
 func (s *Server) SendToRouteV2(ctx context.Context,
 	req *SendToRouteRequest) (*lnrpc.HTLCAttempt, error) {
 
@@ -867,7 +1279,6 @@ func (s *Server) trackPayment(subscription routing.ControlTowerSubscriber,
 	identifier lntypes.Hash, stream Router_TrackPaymentV2Server,
 	noInflightUpdates bool) error {
 
-	// Stream updates to the client.
 	err := s.trackPaymentStream(
 		stream.Context(), subscription, noInflightUpdates, stream.Send,
 	)
diff --git a/lnrpc/routerrpc/routing_config.go b/lnrpc/routerrpc/routing_config.go
index 31494d546..83699a27f 100644
--- a/lnrpc/routerrpc/routing_config.go
+++ b/lnrpc/routerrpc/routing_config.go
@@ -41,6 +41,9 @@ type RoutingConfig struct {
 
 	// BimodalConfig defines parameters for the bimodal probability.
 	BimodalConfig *BimodalConfig `group:"bimodal" namespace:"bimodal" description:"configuration for the bimodal pathfinding probability estimator"`
+
+	// FeeEstimationTimeout is the maximum time to wait for routing fees to be estimated.
+	FeeEstimationTimeout time.Duration `long:"fee-estimation-timeout" description:"the maximum time to wait for routing fees to be estimated by payment probes"`
 }
 
 // AprioriConfig defines parameters for the apriori probability.
diff --git a/routing/missioncontrol.go b/routing/missioncontrol.go
index b3208525b..1dceace7c 100644
--- a/routing/missioncontrol.go
+++ b/routing/missioncontrol.go
@@ -62,6 +62,11 @@ const (
 	// have passed since the previously recorded failure before the failure
 	// amount may be raised.
 	DefaultMinFailureRelaxInterval = time.Minute
+
+	// DefaultFeeEstimationTimeout is the default value for
+	// FeeEstimationTimeout. It defines the maximum duration that the
+	// probing fee estimation is allowed to take.
+	DefaultFeeEstimationTimeout = time.Minute
 )
 
 var (
diff --git a/sample-lnd.conf b/sample-lnd.conf
index 2e7f79376..cac080c7b 100644
--- a/sample-lnd.conf
+++ b/sample-lnd.conf
@@ -1205,6 +1205,9 @@
 ; `Payment_In_FLIGHT` will be sent for compatibility concerns.
 ; routerrpc.usestatusinitiated=false
 
+; Defines the the maximum duration that the probing fee estimation is allowed to
+; take.
+; routerrpc.fee-estimation-timeout=1m
 
 [workers]
 
diff --git a/zpay32/hophint.go b/zpay32/hophint.go
index feb33f9f0..07872b0d6 100644
--- a/zpay32/hophint.go
+++ b/zpay32/hophint.go
@@ -1,6 +1,9 @@
 package zpay32
 
-import "github.com/btcsuite/btcd/btcec/v2"
+import (
+	"github.com/btcsuite/btcd/btcec/v2"
+	"github.com/lightningnetwork/lnd/lnwire"
+)
 
 const (
 	// DefaultAssumedFinalCLTVDelta is the default value to be used as the
@@ -10,6 +13,9 @@ const (
 	// See also:
 	// https://github.com/lightning/bolts/blob/master/02-peer-protocol.md
 	DefaultAssumedFinalCLTVDelta = 18
+
+	// feeRateParts is the total number of parts used to express fee rates.
+	feeRateParts = 1e6
 )
 
 // HopHint is a routing hint that contains the minimum information of a channel
@@ -45,3 +51,13 @@ func (h HopHint) Copy() HopHint {
 		CLTVExpiryDelta:           h.CLTVExpiryDelta,
 	}
 }
+
+// HopFee calculates the fee for a given amount that is forwarded over a hop.
+// The amount has to be denoted in milli satoshi. The returned fee is also
+// denoted in milli satoshi.
+func (h HopHint) HopFee(amt lnwire.MilliSatoshi) lnwire.MilliSatoshi {
+	baseFee := lnwire.MilliSatoshi(h.FeeBaseMSat)
+	feeRate := lnwire.MilliSatoshi(h.FeeProportionalMillionths)
+
+	return baseFee + (amt*feeRate)/feeRateParts
+}


Test patch:
diff --git a/itest/list_on_test.go b/itest/list_on_test.go
index 13d7814a3..69fdf6787 100644
--- a/itest/list_on_test.go
+++ b/itest/list_on_test.go
@@ -257,6 +257,10 @@ var allTestCases = []*lntest.TestCase{
 		Name:     "multi-hop payments",
 		TestFunc: testMultiHopPayments,
 	},
+	{
+		Name:     "estimate route fee",
+		TestFunc: testEstimateRouteFee,
+	},
 	{
 		Name:     "anchors reserved value",
 		TestFunc: testAnchorReservedValue,
diff --git a/itest/lnd_amp_test.go b/itest/lnd_amp_test.go
index 61b6d194a..a96911319 100644
--- a/itest/lnd_amp_test.go
+++ b/itest/lnd_amp_test.go
@@ -89,7 +89,14 @@ func testSendPaymentAMPInvoiceCase(ht *lntest.HarnessTest,
 	// Increase Dave's fee to make the test deterministic. Otherwise it
 	// would be unpredictable whether pathfinding would go through Charlie
 	// or Dave for the first shard.
-	expectedPolicy := mts.updateDaveGlobalPolicy()
+	expectedPolicy := &lnrpc.RoutingPolicy{
+		FeeBaseMsat:      500_000,
+		FeeRateMilliMsat: int64(0.001 * 1_000_000),
+		TimeLockDelta:    40,
+		MinHtlc:          1000, // default value
+		MaxHtlcMsat:      133_650_000,
+	}
+	mts.dave.UpdateGlobalPolicy(expectedPolicy)
 
 	// Make sure Alice has heard it for both Dave's channels.
 	ht.AssertChannelPolicyUpdate(
@@ -382,10 +389,17 @@ func testSendPaymentAMP(ht *lntest.HarnessTest) {
 	mts.openChannels(mppReq)
 	chanPointAliceDave := mts.channelPoints[1]
 
-	// Increase Dave's fee to make the test deterministic. Otherwise it
+	// Increase Dave's fee to make the test deterministic. Otherwise, it
 	// would be unpredictable whether pathfinding would go through Charlie
 	// or Dave for the first shard.
-	expectedPolicy := mts.updateDaveGlobalPolicy()
+	expectedPolicy := &lnrpc.RoutingPolicy{
+		FeeBaseMsat:      500_000,
+		FeeRateMilliMsat: int64(0.001 * 1_000_000),
+		TimeLockDelta:    40,
+		MinHtlc:          1000, // default value
+		MaxHtlcMsat:      133_650_000,
+	}
+	mts.dave.UpdateGlobalPolicy(expectedPolicy)
 
 	// Make sure Alice has heard it.
 	ht.AssertChannelPolicyUpdate(
@@ -493,7 +507,7 @@ func testSendToRouteAMP(ht *lntest.HarnessTest) {
 	// Alice -- Carol ---- Bob
 	//      \              /
 	//       \__ Dave ____/
-	///
+	//
 	mppReq := &mppOpenChannelRequest{
 		// Since the channel Alice-> Carol will have to carry two
 		// shards, we make it larger.
diff --git a/itest/lnd_estimate_route_fee_test.go b/itest/lnd_estimate_route_fee_test.go
new file mode 100644
index 000000000..352dfe5ce
--- /dev/null
+++ b/itest/lnd_estimate_route_fee_test.go
@@ -0,0 +1,405 @@
+package itest
+
+import (
+	"testing"
+
+	"github.com/btcsuite/btcd/btcutil"
+	"github.com/lightningnetwork/lnd/chainreg"
+	"github.com/lightningnetwork/lnd/lnrpc"
+	"github.com/lightningnetwork/lnd/lnrpc/routerrpc"
+	"github.com/lightningnetwork/lnd/lntest"
+	"github.com/lightningnetwork/lnd/lntest/node"
+	"github.com/lightningnetwork/lnd/routing"
+	"github.com/stretchr/testify/require"
+)
+
+var (
+	probeInitiator *node.HarnessNode
+	probeAmount    = btcutil.Amount(100_000)
+	probeAmt       = int64(probeAmount) * 1_000
+
+	failureReasonNone    = lnrpc.PaymentFailureReason_FAILURE_REASON_NONE
+	failureReasonNoRoute = lnrpc.PaymentFailureReason_FAILURE_REASON_NO_ROUTE //nolint:lll
+)
+
+const (
+	ErrNoRouteInGraph = "unable to find a path to destination"
+)
+
+type estimateRouteFeeTestCase struct {
+	// name is the name of the target test case.
+	name string
+
+	// probing is a flag that indicates whether the test case estimates fees
+	// using the graph or by probing.
+	probing bool
+
+	// destination is the node that will receive the probe.
+	destination *node.HarnessNode
+
+	// routeHints are the route hints that will be used for the probe.
+	routeHints []*lnrpc.RouteHint
+
+	// expectedRoutingFeesMsat are the expected routing fees that will be
+	// returned by the probe.
+	expectedRoutingFeesMsat int64
+
+	// expectedCltvDelta is the expected cltv delta that will be returned by
+	// the fee estimation.
+	expectedCltvDelta int64
+
+	// expectedFailureReason is the expected payment failure reason that
+	// will be returned by the probe.
+	expectedFailureReason lnrpc.PaymentFailureReason
+
+	// expectedError are the expected error that will be returned if the
+	// probing fails.
+	expectedError string
+}
+
+// testEstimateRouteFee tests the estimation of routing fees using either graph
+// data or sending out a probe payment.
+func testEstimateRouteFee(ht *lntest.HarnessTest) {
+	mts := newMppTestScenario(ht)
+
+	// We extend the regular mpp test scenario with a new node Paula. Paula
+	// is connected to Bob and Eve through private channels.
+	//                  /-------------\
+	//              _ Eve _  (private) \
+	//             /       \            \
+	// Alice -- Carol ---- Bob --------- Paula
+	//      \              /   (private)
+	//       \__ Dave ____/
+	//
+	req := &mppOpenChannelRequest{
+		amtAliceCarol: 200_000,
+		amtAliceDave:  200_000,
+		amtCarolBob:   200_000,
+		amtCarolEve:   200_000,
+		amtDaveBob:    200_000,
+		amtEveBob:     200_000,
+	}
+	mts.openChannels(req)
+	chanPointDaveBob := mts.channelPoints[4]
+	chanPointEveBob := mts.channelPoints[5]
+
+	// Alice will initiate all probe payments.
+	probeInitiator = mts.alice
+
+	paula := ht.NewNode("Paula", nil)
+
+	// The channel from Bob to Paula actually doesn't have enough liquidity
+	// to carry out the probe. We assume in normal operation that hop hints
+	// added to the invoice always have enough liquidity, but here we check
+	// that the prober uses the more expensive route.
+	ht.EnsureConnected(mts.bob, paula)
+	channelPointBobPaula := ht.OpenChannel(
+		mts.bob, paula, lntest.OpenChannelParams{
+			Private: true,
+			Amt:     90_000,
+			PushAmt: 69_000,
+		},
+	)
+
+	ht.EnsureConnected(mts.eve, paula)
+	channelPointEvePaula := ht.OpenChannel(
+		mts.eve, paula, lntest.OpenChannelParams{
+			Private: true,
+			Amt:     1_000_000,
+		},
+	)
+
+	bobsPrivChannels := ht.Bob.RPC.ListChannels(&lnrpc.ListChannelsRequest{
+		PrivateOnly: true,
+	})
+	require.Len(ht, bobsPrivChannels.Channels, 1)
+	bobPaulaChanID := bobsPrivChannels.Channels[0].ChanId
+
+	evesPrivChannels := mts.eve.RPC.ListChannels(&lnrpc.ListChannelsRequest{
+		PrivateOnly: true,
+	})
+	require.Len(ht, evesPrivChannels.Channels, 1)
+	evePaulaChanID := evesPrivChannels.Channels[0].ChanId
+
+	// Let's disable the paths from Alice to Bob through Dave and Eve with
+	// high fees. This ensures that the path estimates are based on Carol's
+	// channel to Bob for the first set of tests.
+	expectedPolicy := &lnrpc.RoutingPolicy{
+		FeeBaseMsat:      200_000,
+		FeeRateMilliMsat: int64(0.001 * 1_000_000),
+		TimeLockDelta:    40,
+		MinHtlc:          1000, // default value
+		MaxHtlcMsat:      133_650_000,
+	}
+	mts.dave.UpdateGlobalPolicy(expectedPolicy)
+	ht.AssertChannelPolicyUpdate(
+		mts.alice, mts.dave, expectedPolicy, chanPointDaveBob, false,
+	)
+	expectedPolicy.FeeBaseMsat = 500_000
+	mts.eve.UpdateGlobalPolicy(expectedPolicy)
+	ht.AssertChannelPolicyUpdate(
+		mts.alice, mts.eve, expectedPolicy, chanPointEveBob, false,
+	)
+
+	var (
+		bobHopHint = &lnrpc.HopHint{
+			NodeId:                    mts.bob.PubKeyStr,
+			FeeBaseMsat:               1_000,
+			FeeProportionalMillionths: 1,
+			CltvExpiryDelta:           100,
+			ChanId:                    bobPaulaChanID,
+		}
+
+		bobExpHint = &lnrpc.HopHint{
+			NodeId:                    mts.bob.PubKeyStr,
+			FeeBaseMsat:               2000,
+			FeeProportionalMillionths: 2000,
+			CltvExpiryDelta:           80,
+			ChanId:                    bobPaulaChanID,
+		}
+
+		eveHopHint = &lnrpc.HopHint{
+			NodeId:                    mts.eve.PubKeyStr,
+			FeeBaseMsat:               1_000_000,
+			FeeProportionalMillionths: 1,
+			CltvExpiryDelta:           200,
+			ChanId:                    evePaulaChanID,
+		}
+
+		singleRouteHint = []*lnrpc.RouteHint{
+			{
+				HopHints: []*lnrpc.HopHint{
+					bobHopHint,
+				},
+			},
+		}
+
+		lspDifferentFeesHints = []*lnrpc.RouteHint{
+			{
+				HopHints: []*lnrpc.HopHint{
+					bobHopHint,
+				},
+			},
+			{
+				HopHints: []*lnrpc.HopHint{
+					bobExpHint,
+				},
+			},
+		}
+
+		nonLspProbingRouteHints = []*lnrpc.RouteHint{
+			{
+				HopHints: []*lnrpc.HopHint{
+					eveHopHint,
+				},
+			},
+			{
+				HopHints: []*lnrpc.HopHint{
+					bobHopHint,
+				},
+			},
+		}
+	)
+
+	defaultTimelock := int64(chainreg.DefaultBitcoinTimeLockDelta)
+
+	// Going A -> Carol -> Bob
+	feeStandardSingleHop := int64(1_000) + probeAmt/1_000_000
+
+	// Going A -> Carol -> Bob -> Paula/no node
+	feeBP := int64(bobHopHint.FeeBaseMsat) +
+		int64(bobHopHint.FeeProportionalMillionths)*(probeAmt)/1_000_000
+	deltaBP := int64(bobHopHint.CltvExpiryDelta)
+
+	feeCB := int64(1_000) + (probeAmt+feeBP)/1_000_000
+	deltaCB := defaultTimelock
+
+	deltaACBP := deltaCB + deltaBP
+	feeACBP := feeCB + feeBP
+
+	// The expensive alternative to Bob.
+	expFeeBP := int64(bobExpHint.FeeBaseMsat) +
+		int64(bobExpHint.FeeProportionalMillionths)*(probeAmt)/1_000_000
+	expFeeCB := int64(1_000) + (probeAmt+expFeeBP)/1_000_000
+	expensiveFeeACBP := expFeeCB + expFeeBP
+
+	// Going A -> Carol -> Eve -> Paula
+	feeEP := int64(eveHopHint.FeeBaseMsat) +
+		int64(eveHopHint.FeeProportionalMillionths)*(probeAmt)/1_000_000
+	deltaEP := int64(eveHopHint.CltvExpiryDelta)
+
+	feeCE := int64(1_000) + (probeAmt+feeEP)/1_000_000
+	deltaCE := defaultTimelock
+
+	feeACEP := feeEP + feeCE
+	deltaACEP := deltaCE + deltaEP
+
+	initialBlockHeight := int64(mts.alice.RPC.GetInfo().BlockHeight)
+
+	// Locktime is always composed of the initial block height and the
+	// time lock delta for the first hop. Additionally, there's a block
+	// accounting for block height variance.
+	locktime := initialBlockHeight + defaultTimelock +
+		int64(routing.BlockPadding)
+
+	var testCases = []*estimateRouteFeeTestCase{
+		// Single hop payment is free.
+		{
+			name:                    "graph based estimate, 0 fee",
+			probing:                 false,
+			destination:             mts.dave,
+			expectedRoutingFeesMsat: 0,
+			expectedCltvDelta:       locktime,
+			expectedFailureReason:   failureReasonNone,
+		},
+		// 1000 msat base fee + 100 msat(1ppm*100_000sat)
+		{
+			name:                    "graph based estimate",
+			probing:                 false,
+			destination:             mts.bob,
+			expectedRoutingFeesMsat: feeStandardSingleHop,
+			expectedCltvDelta:       locktime + deltaCB,
+			expectedFailureReason:   failureReasonNone,
+		},
+		// We expect the same result as the graph based estimate to Bob.
+		{
+			name: "probe based estimate, empty " +
+				"route hint",
+			probing:                 true,
+			destination:             mts.bob,
+			routeHints:              []*lnrpc.RouteHint{},
+			expectedRoutingFeesMsat: feeStandardSingleHop,
+			expectedCltvDelta:       locktime + deltaCB,
+			expectedFailureReason:   failureReasonNone,
+		},
+		// We expect the previous probing results adjusted by Paula's
+		// hop data.
+		{
+			name: "probe based estimate, single" +
+				" route hint",
+			probing:                 true,
+			destination:             paula,
+			routeHints:              singleRouteHint,
+			expectedRoutingFeesMsat: feeACBP,
+			expectedCltvDelta:       locktime + deltaACBP,
+			expectedFailureReason:   failureReasonNone,
+		},
+		// With multiple route hints and lsp detected, we expect the
+		// highest of fee settings to be used for estimation.
+		{
+			name: "probe based estimate, " +
+				"multiple route hints, diff lsp fees",
+			probing:                 true,
+			destination:             paula,
+			routeHints:              lspDifferentFeesHints,
+			expectedRoutingFeesMsat: expensiveFeeACBP,
+			expectedCltvDelta:       locktime + deltaACBP,
+			expectedFailureReason:   failureReasonNone,
+		},
+		// A destination without channels and an existing hop hint hop
+		// should result in the same estimate as if the hidden node was
+		// connected through a channel. This ensures that the probe is
+		// actually just send to the LSP and not the destination.
+		{
+			name: "single hop hint, destination " +
+				"without channels",
+			probing: true,
+			destination: ht.NewNode(
+				"ImWithoutChannels", nil,
+			),
+			routeHints:              singleRouteHint,
+			expectedRoutingFeesMsat: feeACBP,
+			expectedCltvDelta:       locktime + deltaACBP,
+			expectedFailureReason:   failureReasonNone,
+		},
+		// Test lnd native hop processing with non lsp probing. Paula is
+		// lacking liqudity in the channel to Bob, so Eve is used, but
+		// it has higher fees.
+		{
+			name: "probe based estimate, non " +
+				"lsp",
+			probing:                 true,
+			destination:             paula,
+			routeHints:              nonLspProbingRouteHints,
+			expectedRoutingFeesMsat: feeACEP,
+			expectedCltvDelta:       locktime + deltaACEP,
+			expectedFailureReason:   failureReasonNone,
+		},
+		// We expect a NO_ROUTE error if route hints to paula aren't
+		// provided while probing the graph.
+		{
+			name:          "no route via graph",
+			probing:       false,
+			destination:   paula,
+			expectedError: ErrNoRouteInGraph,
+		},
+		// We expect a NO_ROUTE error if route hints to paula aren't
+		// provided while sending a probe payment.
+		{
+			name:                    "no route via probe",
+			probing:                 true,
+			destination:             paula,
+			expectedRoutingFeesMsat: 0,
+			expectedCltvDelta:       0,
+			expectedFailureReason:   failureReasonNoRoute,
+		},
+	}
+
+	for _, testCase := range testCases {
+		success := ht.Run(
+			testCase.name, func(tt *testing.T) {
+				runFeeEstimationTestCase(ht, testCase)
+			},
+		)
+
+		if !success {
+			break
+		}
+	}
+
+	mts.ht.CloseChannelAssertPending(mts.bob, channelPointBobPaula, false)
+	mts.ht.CloseChannelAssertPending(mts.eve, channelPointEvePaula, false)
+	mts.closeChannels()
+}
+
+// runTestCase runs a single test case asserting that test conditions are met.
+func runFeeEstimationTestCase(ht *lntest.HarnessTest,
+	tc *estimateRouteFeeTestCase) {
+
+	// Legacy graph based fee estimation.
+	var feeReq *routerrpc.RouteFeeRequest
+	if tc.probing {
+		payReqs, _, _ := ht.CreatePayReqs(
+			tc.destination, probeAmount, 1, tc.routeHints...,
+		)
+		feeReq = &routerrpc.RouteFeeRequest{
+			PaymentRequest: payReqs[0],
+			Timeout:        10,
+		}
+	} else {
+		feeReq = &routerrpc.RouteFeeRequest{
+			Dest:   tc.destination.PubKey[:],
+			AmtSat: int64(probeAmount),
+		}
+	}
+
+	ctx := ht.Context()
+
+	// Kick off the parametrized fee estimation.
+	resp, err := probeInitiator.RPC.Router.EstimateRouteFee(ctx, feeReq)
+	if err != nil {
+		require.ErrorContains(ht, err, tc.expectedError)
+
+		return
+	}
+
+	require.Equal(ht, tc.expectedFailureReason, resp.FailureReason)
+	require.Equal(
+		ht, tc.expectedRoutingFeesMsat, resp.RoutingFeeMsat,
+		"routing fees",
+	)
+	require.Equal(
+		ht, tc.expectedCltvDelta, resp.TimeLockDelay,
+		"cltv delta",
+	)
+}
diff --git a/itest/lnd_mpp_test.go b/itest/lnd_mpp_test.go
index 9a28846dc..960626500 100644
--- a/itest/lnd_mpp_test.go
+++ b/itest/lnd_mpp_test.go
@@ -347,33 +347,3 @@ func (m *mppTestScenario) buildRoute(amt btcutil.Amount,
 
 	return routeResp.Route
 }
-
-// updatePolicy updates a Dave's global channel policy and returns the expected
-// policy for further check. It changes Dave's `FeeBaseMsat` from 1000 msat to
-// 500,000 msat, and `FeeProportionalMillonths` from 1 msat to 1000 msat.
-func (m *mppTestScenario) updateDaveGlobalPolicy() *lnrpc.RoutingPolicy {
-	const (
-		baseFeeMsat = 500_000
-		feeRate     = 0.001
-		maxHtlcMsat = 133_650_000
-	)
-
-	expectedPolicy := &lnrpc.RoutingPolicy{
-		FeeBaseMsat:      baseFeeMsat,
-		FeeRateMilliMsat: feeRate * testFeeBase,
-		TimeLockDelta:    40,
-		MinHtlc:          1000, // default value
-		MaxHtlcMsat:      maxHtlcMsat,
-	}
-
-	updateFeeReq := &lnrpc.PolicyUpdateRequest{
-		BaseFeeMsat:   baseFeeMsat,
-		FeeRate:       feeRate,
-		TimeLockDelta: 40,
-		Scope:         &lnrpc.PolicyUpdateRequest_Global{Global: true},
-		MaxHtlcMsat:   maxHtlcMsat,
-	}
-	m.dave.RPC.UpdateChannelPolicy(updateFeeReq)
-
-	return expectedPolicy
-}
diff --git a/itest/lnd_send_multi_path_payment_test.go b/itest/lnd_send_multi_path_payment_test.go
index 10ad3f4a2..935997c8d 100644
--- a/itest/lnd_send_multi_path_payment_test.go
+++ b/itest/lnd_send_multi_path_payment_test.go
@@ -38,10 +38,17 @@ func testSendMultiPathPayment(ht *lntest.HarnessTest) {
 	mts.openChannels(req)
 	chanPointAliceDave := mts.channelPoints[1]
 
-	// Increase Dave's fee to make the test deterministic. Otherwise it
+	// Increase Dave's fee to make the test deterministic. Otherwise, it
 	// would be unpredictable whether pathfinding would go through Charlie
 	// or Dave for the first shard.
-	expectedPolicy := mts.updateDaveGlobalPolicy()
+	expectedPolicy := &lnrpc.RoutingPolicy{
+		FeeBaseMsat:      500_000,
+		FeeRateMilliMsat: int64(0.001 * 1_000_000),
+		TimeLockDelta:    40,
+		MinHtlc:          1000, // default value
+		MaxHtlcMsat:      133_650_000,
+	}
+	mts.dave.UpdateGlobalPolicy(expectedPolicy)
 
 	// Make sure Alice has heard it.
 	ht.AssertChannelPolicyUpdate(
diff --git a/lnrpc/routerrpc/router_server_test.go b/lnrpc/routerrpc/router_server_test.go
index 1cdb4b586..22f210ee9 100644
--- a/lnrpc/routerrpc/router_server_test.go
+++ b/lnrpc/routerrpc/router_server_test.go
@@ -5,10 +5,13 @@ import (
 	"testing"
 	"time"
 
+	"github.com/btcsuite/btcd/btcec/v2"
 	"github.com/lightningnetwork/lnd/channeldb"
 	"github.com/lightningnetwork/lnd/lnrpc"
+	"github.com/lightningnetwork/lnd/lnwire"
 	"github.com/lightningnetwork/lnd/queue"
 	"github.com/lightningnetwork/lnd/routing"
+	"github.com/lightningnetwork/lnd/zpay32"
 	"github.com/stretchr/testify/require"
 	"google.golang.org/grpc"
 )
@@ -214,3 +217,186 @@ func TestTrackPaymentsNoInflightUpdates(t *testing.T) {
 	payment := <-stream.sentFromServer
 	require.Equal(t, lnrpc.Payment_SUCCEEDED, payment.Status)
 }
+
+// TestIsLsp tests the isLSP heuristic. Combinations of different route hints
+// with different fees and cltv deltas are tested to ensure that the heuristic
+// correctly identifies whether a route leads to an LSP or not.
+func TestIsLsp(t *testing.T) {
+	probeAmtMsat := lnwire.MilliSatoshi(1_000_000)
+
+	alicePrivKey, err := btcec.NewPrivateKey()
+	require.NoError(t, err)
+	alicePubKey := alicePrivKey.PubKey()
+
+	bobPrivKey, err := btcec.NewPrivateKey()
+	require.NoError(t, err)
+	bobPubKey := bobPrivKey.PubKey()
+
+	carolPrivKey, err := btcec.NewPrivateKey()
+	require.NoError(t, err)
+	carolPubKey := carolPrivKey.PubKey()
+
+	davePrivKey, err := btcec.NewPrivateKey()
+	require.NoError(t, err)
+	davePubKey := davePrivKey.PubKey()
+
+	var (
+		aliceHopHint = zpay32.HopHint{
+			NodeID:                    alicePubKey,
+			FeeBaseMSat:               100,
+			FeeProportionalMillionths: 1_000,
+			ChannelID:                 421337,
+		}
+
+		bobHopHint = zpay32.HopHint{
+			NodeID:                    bobPubKey,
+			FeeBaseMSat:               2_000,
+			FeeProportionalMillionths: 2_000,
+			CLTVExpiryDelta:           288,
+			ChannelID:                 815,
+		}
+
+		carolHopHint = zpay32.HopHint{
+			NodeID:                    carolPubKey,
+			FeeBaseMSat:               2_000,
+			FeeProportionalMillionths: 2_000,
+			ChannelID:                 815,
+		}
+
+		daveHopHint = zpay32.HopHint{
+			NodeID:                    davePubKey,
+			FeeBaseMSat:               2_000,
+			FeeProportionalMillionths: 2_000,
+			ChannelID:                 815,
+		}
+	)
+
+	bobExpensiveCopy := bobHopHint.Copy()
+	bobExpensiveCopy.FeeBaseMSat = 1_000_000
+	bobExpensiveCopy.FeeProportionalMillionths = 1_000_000
+	bobExpensiveCopy.CLTVExpiryDelta = bobHopHint.CLTVExpiryDelta - 1
+
+	//nolint:lll
+	lspTestCases := []struct {
+		name           string
+		routeHints     [][]zpay32.HopHint
+		probeAmtMsat   lnwire.MilliSatoshi
+		isLsp          bool
+		expectedHints  [][]zpay32.HopHint
+		expectedLspHop *zpay32.HopHint
+	}{
+		{
+			name:           "empty route hints",
+			routeHints:     [][]zpay32.HopHint{{}},
+			probeAmtMsat:   probeAmtMsat,
+			isLsp:          false,
+			expectedHints:  [][]zpay32.HopHint{},
+			expectedLspHop: nil,
+		},
+		{
+			name:           "single route hint",
+			routeHints:     [][]zpay32.HopHint{{daveHopHint}},
+			probeAmtMsat:   probeAmtMsat,
+			isLsp:          true,
+			expectedHints:  [][]zpay32.HopHint{},
+			expectedLspHop: &daveHopHint,
+		},
+		{
+			name: "single route, multiple hints",
+			routeHints: [][]zpay32.HopHint{{
+				aliceHopHint, bobHopHint,
+			}},
+			probeAmtMsat:   probeAmtMsat,
+			isLsp:          true,
+			expectedHints:  [][]zpay32.HopHint{{aliceHopHint}},
+			expectedLspHop: &bobHopHint,
+		},
+		{
+			name: "multiple routes, multiple hints",
+			routeHints: [][]zpay32.HopHint{
+				{
+					aliceHopHint, bobHopHint,
+				},
+				{
+					carolHopHint, bobHopHint,
+				},
+			},
+			probeAmtMsat: probeAmtMsat,
+			isLsp:        true,
+			expectedHints: [][]zpay32.HopHint{
+				{aliceHopHint}, {carolHopHint},
+			},
+			expectedLspHop: &bobHopHint,
+		},
+		{
+			name: "multiple routes, multiple hints with min length",
+			routeHints: [][]zpay32.HopHint{
+				{
+					bobHopHint,
+				},
+				{
+					carolHopHint, bobHopHint,
+				},
+			},
+			probeAmtMsat: probeAmtMsat,
+			isLsp:        true,
+			expectedHints: [][]zpay32.HopHint{
+				{carolHopHint},
+			},
+			expectedLspHop: &bobHopHint,
+		},
+		{
+			name: "multiple routes, multiple hints, diff fees+cltv",
+			routeHints: [][]zpay32.HopHint{
+				{
+					bobHopHint,
+				},
+				{
+					carolHopHint, bobExpensiveCopy,
+				},
+			},
+			probeAmtMsat: probeAmtMsat,
+			isLsp:        true,
+			expectedHints: [][]zpay32.HopHint{
+				{carolHopHint},
+			},
+			expectedLspHop: &zpay32.HopHint{
+				NodeID:                    bobHopHint.NodeID,
+				ChannelID:                 bobHopHint.ChannelID,
+				FeeBaseMSat:               bobExpensiveCopy.FeeBaseMSat,
+				FeeProportionalMillionths: bobExpensiveCopy.FeeProportionalMillionths,
+				CLTVExpiryDelta:           bobHopHint.CLTVExpiryDelta,
+			},
+		},
+		{
+			name: "multiple routes, different final hops",
+			routeHints: [][]zpay32.HopHint{
+				{
+					aliceHopHint, bobHopHint,
+				},
+				{
+					carolHopHint, daveHopHint,
+				},
+			},
+			probeAmtMsat:   probeAmtMsat,
+			isLsp:          false,
+			expectedHints:  [][]zpay32.HopHint{},
+			expectedLspHop: nil,
+		},
+	}
+
+	for _, tc := range lspTestCases {
+		t.Run(tc.name, func(t *testing.T) {
+			require.Equal(t, tc.isLsp, isLSP(tc.routeHints))
+			if !tc.isLsp {
+				return
+			}
+
+			adjustedHints, lspHint, _ := prepareLspRouteHints(
+				tc.routeHints, tc.probeAmtMsat,
+			)
+			require.Equal(t, tc.expectedHints, adjustedHints)
+			require.Equal(t, tc.expectedLspHop, lspHint)
+		})
+	}
+}
diff --git a/lntest/harness.go b/lntest/harness.go
index 23f5a8b43..c0a5da7f0 100644
--- a/lntest/harness.go
+++ b/lntest/harness.go
@@ -1614,8 +1614,8 @@ func (h *HarnessTest) mineTillForceCloseResolved(hn *node.HarnessNode) {
 // CreatePayReqs is a helper method that will create a slice of payment
 // requests for the given node.
 func (h *HarnessTest) CreatePayReqs(hn *node.HarnessNode,
-	paymentAmt btcutil.Amount, numInvoices int) ([]string,
-	[][]byte, []*lnrpc.Invoice) {
+	paymentAmt btcutil.Amount, numInvoices int,
+	routeHints ...*lnrpc.RouteHint) ([]string, [][]byte, []*lnrpc.Invoice) {
 
 	payReqs := make([]string, numInvoices)
 	rHashes := make([][]byte, numInvoices)
@@ -1624,9 +1624,10 @@ func (h *HarnessTest) CreatePayReqs(hn *node.HarnessNode,
 		preimage := h.Random32Bytes()
 
 		invoice := &lnrpc.Invoice{
-			Memo:      "testing",
-			RPreimage: preimage,
-			Value:     int64(paymentAmt),
+			Memo:       "testing",
+			RPreimage:  preimage,
+			Value:      int64(paymentAmt),
+			RouteHints: routeHints,
 		}
 		resp := hn.RPC.AddInvoice(invoice)
 
diff --git a/lntest/node/harness_node.go b/lntest/node/harness_node.go
index 64c5eb9b6..71d55d9ea 100644
--- a/lntest/node/harness_node.go
+++ b/lntest/node/harness_node.go
@@ -876,6 +876,19 @@ func (hn *HarnessNode) RestoreDB() error {
 	return nil
 }
 
+// UpdateGlobalPolicy updates a node's global channel policy.
+func (hn *HarnessNode) UpdateGlobalPolicy(policy *lnrpc.RoutingPolicy) {
+	updateFeeReq := &lnrpc.PolicyUpdateRequest{
+		BaseFeeMsat: policy.FeeBaseMsat,
+		FeeRate: float64(policy.FeeRateMilliMsat) /
+			float64(1_000_000),
+		TimeLockDelta: policy.TimeLockDelta,
+		Scope:         &lnrpc.PolicyUpdateRequest_Global{Global: true},
+		MaxHtlcMsat:   policy.MaxHtlcMsat,
+	}
+	hn.RPC.UpdateChannelPolicy(updateFeeReq)
+}
+
 func postgresDatabaseDsn(dbName string) string {
 	return fmt.Sprintf(postgresDsn, dbName)
 }