SendMany

SendMany handles a request for a transaction that creates multiple specified outputs in parallel. If neither target_conf, or sat_per_vbyte are set, then the internal wallet will consult its fee model to determine a fee for the default confirmation target.

Source: lightning.proto

gRPC

rpc SendMany (SendManyRequest) returns (SendManyResponse);

REST

HTTP Method	Path
POST	/v1/transactions/many

Code Samples

gRPC

Javascript

const fs = require('fs');
const grpc = require('@grpc/grpc-js');
const protoLoader = require('@grpc/proto-loader');

const GRPC_HOST = 'localhost:10009'
const MACAROON_PATH = 'LND_DIR/data/chain/bitcoin/regtest/admin.macaroon'
const TLS_PATH = 'LND_DIR/tls.cert'

const loaderOptions = {
  keepCase: true,
  longs: String,
  enums: String,
  defaults: true,
  oneofs: true,
};
const packageDefinition = protoLoader.loadSync('lightning.proto', loaderOptions);
const lnrpc = grpc.loadPackageDefinition(packageDefinition).lnrpc;
process.env.GRPC_SSL_CIPHER_SUITES = 'HIGH+ECDSA';
const tlsCert = fs.readFileSync(TLS_PATH);
const sslCreds = grpc.credentials.createSsl(tlsCert);
const macaroon = fs.readFileSync(MACAROON_PATH).toString('hex');
const macaroonCreds = grpc.credentials.createFromMetadataGenerator(function(args, callback) {
  let metadata = new grpc.Metadata();
  metadata.add('macaroon', macaroon);
  callback(null, metadata);
});
let creds = grpc.credentials.combineChannelCredentials(sslCreds, macaroonCreds);
let client = new lnrpc.Lightning(GRPC_HOST, creds);
let request = {
  AddrToAmount: <AddrToAmountEntry>,
  target_conf: <int32>,
  sat_per_vbyte: <uint64>,
  sat_per_byte: <int64>,
  label: <string>,
  min_confs: <int32>,
  spend_unconfirmed: <bool>,
};
client.sendMany(request, function(err, response) {
  console.log(response);
});
// Console output:
//  {
//    "txid": <string>,
//  }

Python

import codecs, grpc, os
# Generate the following 2 modules by compiling the lightning.proto with the grpcio-tools.
# See https://github.com/lightningnetwork/lnd/blob/master/docs/grpc/python.md for instructions.
import lightning_pb2 as lnrpc, lightning_pb2_grpc as lightningstub

GRPC_HOST = 'localhost:10009'
MACAROON_PATH = 'LND_DIR/data/chain/bitcoin/regtest/admin.macaroon'
TLS_PATH = 'LND_DIR/tls.cert'

# create macaroon credentials
macaroon = codecs.encode(open(MACAROON_PATH, 'rb').read(), 'hex')
def metadata_callback(context, callback):
  callback([('macaroon', macaroon)], None)
auth_creds = grpc.metadata_call_credentials(metadata_callback)
# create SSL credentials
os.environ['GRPC_SSL_CIPHER_SUITES'] = 'HIGH+ECDSA'
cert = open(TLS_PATH, 'rb').read()
ssl_creds = grpc.ssl_channel_credentials(cert)
# combine macaroon and SSL credentials
combined_creds = grpc.composite_channel_credentials(ssl_creds, auth_creds)
# make the request
channel = grpc.secure_channel(GRPC_HOST, combined_creds)
stub = lightningstub.LightningStub(channel)
request = lnrpc.SendManyRequest(
  AddrToAmount=<AddrToAmountEntry>,
  target_conf=<int32>,
  sat_per_vbyte=<uint64>,
  sat_per_byte=<int64>,
  label=<string>,
  min_confs=<int32>,
  spend_unconfirmed=<bool>,
)
response = stub.SendMany(request)
print(response)
# {
#    "txid": <string>,
# }

REST

Javascript

const fs = require('fs');
const request = require('request');

const REST_HOST = 'localhost:8080'
const MACAROON_PATH = 'LND_DIR/data/chain/bitcoin/regtest/admin.macaroon'

let requestBody = {
  AddrToAmount: <object>, // <AddrToAmountEntry> 
  target_conf: <integer>, // <int32> 
  sat_per_vbyte: <string>, // <uint64> 
  sat_per_byte: <string>, // <int64> 
  label: <string>, // <string> 
  min_confs: <integer>, // <int32> 
  spend_unconfirmed: <boolean>, // <bool> 
};
let options = {
  url: `https://${REST_HOST}/v1/transactions/many`,
  // Work-around for self-signed certificates.
  rejectUnauthorized: false,
  json: true,
  headers: {
    'Grpc-Metadata-macaroon': fs.readFileSync(MACAROON_PATH).toString('hex'),
  },
  form: JSON.stringify(requestBody),
}
request.post(options, function(error, response, body) {
  console.log(body);
});
// Console output:
//  {
//    "txid": <string>, // <string> 
//  }

Python

import base64, codecs, json, requests

REST_HOST = 'localhost:8080'
MACAROON_PATH = 'LND_DIR/data/chain/bitcoin/regtest/admin.macaroon'
TLS_PATH = 'LND_DIR/tls.cert'

url = f'https://{REST_HOST}/v1/transactions/many'
macaroon = codecs.encode(open(MACAROON_PATH, 'rb').read(), 'hex')
headers = {'Grpc-Metadata-macaroon': macaroon}
data = {
  'AddrToAmount': <AddrToAmountEntry>,
  'target_conf': <int32>,
  'sat_per_vbyte': <uint64>,
  'sat_per_byte': <int64>,
  'label': <string>,
  'min_confs': <int32>,
  'spend_unconfirmed': <bool>,
}
r = requests.post(url, headers=headers, data=json.dumps(data), verify=TLS_PATH)
print(r.json())
# {
#    "txid": <string>,
# }

Shell

$ lncli sendmany --help

NAME:
   lncli sendmany - Send bitcoin on-chain to multiple addresses.

USAGE:
   lncli sendmany [command options] send-json-string [--conf_target=N] [--sat_per_vbyte=P]

CATEGORY:
   On-chain

DESCRIPTION:
   
  Create and broadcast a transaction paying the specified amount(s) to the passed address(es).

  The send-json-string' param decodes addresses and the amount to send
  respectively in the following format:

      '{"ExampleAddr": NumCoinsInSatoshis, "SecondAddr": NumCoins}'
  

OPTIONS:
   --conf_target value    (optional) the number of blocks that the transaction *should* confirm in, will be used for fee estimation (default: 0)
   --sat_per_vbyte value  (optional) a manual fee expressed in sat/vbyte that should be used when crafting the transaction (default: 0)
   --min_confs value      (optional) the minimum number of confirmations each one of your outputs used for the transaction must satisfy (default: 1)
   --label value          (optional) a label for the transaction
   

Messages

lnrpc.SendManyRequest

Source: lightning.proto

Field	gRPC Type	REST Type	REST Placement
AddrToAmount The map from addresses to amounts	AddrToAmountEntry[]	object	body
target_conf The target number of blocks that this transaction should be confirmed by.	int32	integer	body
sat_per_vbyte A manual fee rate set in sat/vbyte that should be used when crafting the transaction.	uint64	string	body
sat_per_byte Deprecated, use sat_per_vbyte. A manual fee rate set in sat/vbyte that should be used when crafting the transaction.	int64	string	body
label An optional label for the transaction, limited to 500 characters.	string	string	body
min_confs The minimum number of confirmations each one of your outputs used for the transaction must satisfy.	int32	integer	body
spend_unconfirmed Whether unconfirmed outputs should be used as inputs for the transaction.	bool	boolean	body

lnrpc.SendManyResponse

Source: lightning.proto

Field	gRPC Type	REST Type
txid The id of the transaction	string	string

Nested Messages

lnrpc.SendManyRequest.AddrToAmountEntry

Field	gRPC Type	REST Type
key	string	unknown
value	int64	unknown