LIGHTNING-GETROUTE(7) LIGHTNING-GETROUTE(7) NAME getroute -- Command for routing a payment (low-level) SYNOPSIS getroute id amount_msat riskfactor [cltv] [fromid] [fuzzpercent] [exclude] [maxhops] DESCRIPTION Command deprecated in v26.06, removed after v27.03. NOTE: As of v26.06, getroute is deprecated in favor of getroutes. The usual equivalent is to use getroutes with layers including auto.localchans, auto.sourcefree and maxparts set to 1. The getroute RPC command attempts to find the best route for the payment of amount_msat to lightning node id, such that the payment will arrive at id with cltv. There are two considerations for how good a route is: how low the fees are, and how long your payment will get stuck in a delayed output if a node goes down during the process. . * id (pubkey): Node pubkey to find the best route for the payment. * amount_msat (msat): Amount to send. It can be a whole number, or a whole number ending in msat or sat, or a number with three decimal places end- ing in sat, or a number with 1 to 11 decimal places ending in btc. The 0 value is special: it ignores any htlc_minimum_msat setting on channels, and simply returns a possible route (if any) which is useful for simple probing. * riskfactor (u64): A non-negative floating-point field controls this tradeoff; it is the annual cost of your funds being stuck (as a percent- age). For example, if you thought the convenience of keeping your funds liquid (not stuck) was worth 20% per annum interest, riskfactor would be 20. If you didn't care about risk, riskfactor would be zero. * cltv (u32, optional): Cltv-blocks to spare. The default is 9. * fromid (pubkey, optional): The node to start the route from. The default is this node. * fuzzpercent (u32, optional): Used to distort fees to provide some ran- domization to the route generated, but it was not properly implemented and is ignored. * exclude (array of strings, optional): A JSON array of short-channel- id/direction (e.g. ['564334x877x1/0', '564195x1292x0/1' ]) or node-id which should be excluded from consideration for routing. Note if the source or destination is excluded, the command result is undefined. The default is not to exclude any channels or nodes.: * (string, optional) * maxhops (u32, optional): The maximum number of channels to return. The default is 20. RISKFACTOR EFFECT ON ROUTING The risk factor is treated as if it were an additional fee on the route, for the purposes of comparing routes. The formula used is the following approximation: risk-fee = amount x blocks-timeout x per-block-cost We are given a riskfactor expressed as a percentage. There are 52596 blocks per year, thus per-block-cost is riskfactor divided by 5,259,600. The final result is: risk-fee = amount x blocks-timeout x riskfactor / 5259600 Here are the risk fees in millisatoshis, using various parameters. I assume a channel charges the default of 1000 millisatoshis plus 1 part-per-mil- lion. Common to_self_delay values on the network at 14 and 144 blocks. +-----------------+----------------+----------+--------------+------------+ | Amount (msat) | Riskfactor | Delay | Risk Fee | Route fee | +-----------------+----------------+----------+--------------+------------+ | 10,000 | 1 | 14 | 0 | 1001 | +-----------------+----------------+----------+--------------+------------+ | 10,000 | 10 | 14 | 0 | 1001 | +-----------------+----------------+----------+--------------+------------+ | 10,000 | 100 | 14 | 2 | 1001 | +-----------------+----------------+----------+--------------+------------+ | 10,000 | 1000 | 14 | 26 | 1001 | +-----------------+----------------+----------+--------------+------------+ | 1,000,000 | 1 | 14 | 2 | 1001 | +-----------------+----------------+----------+--------------+------------+ | 1,000,000 | 10 | 14 | 26 | 1001 | +-----------------+----------------+----------+--------------+------------+ | 1,000,000 | 100 | 14 | 266 | 1001 | +-----------------+----------------+----------+--------------+------------+ | 1,000,000 | 1000 | 14 | 2661 | 1001 | +-----------------+----------------+----------+--------------+------------+ | 100,000,000 | 1 | 14 | 266 | 1100 | +-----------------+----------------+----------+--------------+------------+ | 100,000,000 | 10 | 14 | 2661 | 1100 | +-----------------+----------------+----------+--------------+------------+ | 100,000,000 | 100 | 14 | 26617 | 1100 | +-----------------+----------------+----------+--------------+------------+ | 100,000,000 | 1000 | 14 | 266179 | 1100 | +-----------------+----------------+----------+--------------+------------+ | 10,000 | 1 | 144 | 0 | 1001 | +-----------------+----------------+----------+--------------+------------+ | 10,000 | 10 | 144 | 2 | 1001 | +-----------------+----------------+----------+--------------+------------+ | 10,000 | 100 | 144 | 27 | 1001 | +-----------------+----------------+----------+--------------+------------+ | 10,000 | 1000 | 144 | 273 | 1001 | +-----------------+----------------+----------+--------------+------------+ | 1,000,000 | 1 | 144 | 27 | 1001 | +-----------------+----------------+----------+--------------+------------+ | 1,000,000 | 10 | 144 | 273 | 1001 | +-----------------+----------------+----------+--------------+------------+ | 1,000,000 | 100 | 144 | 2737 | 1001 | +-----------------+----------------+----------+--------------+------------+ | 1,000,000 | 1000 | 144 | 27378 | 1001 | +-----------------+----------------+----------+--------------+------------+ | 100,000,000 | 1 | 144 | 2737 | 1100 | +-----------------+----------------+----------+--------------+------------+ | 100,000,000 | 10 | 144 | 27378 | 1100 | +-----------------+----------------+----------+--------------+------------+ | 100,000,000 | 100 | 144 | 273785 | 1100 | +-----------------+----------------+----------+--------------+------------+ | 100,000,000 | 1000 | 144 | 2737850 | 1100 | +-----------------+----------------+----------+--------------+------------+ RECOMMENDED RISKFACTOR VALUES The default fuzz factor is 5%, so as you can see from the table above, that tends to overwhelm the effect of riskfactor less than about 5. 1 is a conservative value for a stable lightning network with very few failures. 1000 is an aggressive value for trying to minimize timeouts at all costs. The default for lightning-pay(7) is 10, which starts to become a major fac- tor for larger amounts, and is basically ignored for tiny ones. RETURN VALUE On success, an object containing route is returned. It is an array of ob- jects, where each object contains: * id (pubkey): The node at the end of this hop. * channel (short_channel_id): The channel joining these nodes. * direction (u32): 0 if this channel is traversed from lesser to greater id, otherwise 1. * amount_msat (msat): The amount expected by the node at the end of this hop. * delay (u32): The total CLTV expected by the node at the end of this hop. * style (string) (always "tlv"): The features understood by the destina- tion node. The final id will be the destination id given in the input. The difference between the first amount_msat minus the amount_msat given in the input is the fee (assuming the first hop is free). The first delay is the very worst case timeout for the payment failure, in blocks. AUTHOR Rusty Russell rusty@rustcorp.com.au is mainly responsible. SEE ALSO lightning-pay(7), lightning-sendpay(7) RESOURCES Main web site: https://github.com/ElementsProject/lightning EXAMPLES Example 1: Request: $ lightning-cli getroute -k "id"="nodeid030303030303030303030303030303030303030303030303030303030303" "amount_msat"=10000 "riskfactor"=1 { "id": "example:getroute#1", "method": "getroute", "params": { "id": "nodeid030303030303030303030303030303030303030303030303030303030303", "amount_msat": 10000, "riskfactor": 1 } } Response: { "route": [ { "id": "nodeid020202020202020202020202020202020202020202020202020202020202", "channel": "109x1x1", "direction": 1, "amount_msat": 10001, "delay": 15, "style": "tlv" }, { "id": "nodeid030303030303030303030303030303030303030303030303030303030303", "channel": "111x1x1", "direction": 0, "amount_msat": 10000, "delay": 9, "style": "tlv" } ] } Example 2: Request: $ lightning-cli getroute -k "id"="nodeid040404040404040404040404040404040404040404040404040404040404" "amount_msat"=500000 "riskfactor"=10 "cltv"=9 { "id": "example:getroute#2", "method": "getroute", "params": { "id": "nodeid040404040404040404040404040404040404040404040404040404040404", "amount_msat": 500000, "riskfactor": 10, "cltv": 9 } } Response: { "route": [ { "id": "nodeid030303030303030303030303030303030303030303030303030303030303", "channel": "111x1x1", "direction": 0, "amount_msat": 500006, "delay": 15, "style": "tlv" }, { "id": "nodeid040404040404040404040404040404040404040404040404040404040404", "channel": "125x1x1", "direction": 0, "amount_msat": 500000, "delay": 9, "style": "tlv" } ] } Core Lightning v26.06.1 LIGHTNING-GETROUTE(7)
NAME | SYNOPSIS | DESCRIPTION | RISKFACTOR EFFECT ON ROUTING | RECOMMENDED RISKFACTOR VALUES | RETURN VALUE | AUTHOR | SEE ALSO | RESOURCES | EXAMPLES
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