fundrawtransaction

fundrawtransaction "hexstring" ( options iswitness )

Add inputs to a transaction until it has enough in value to meet its out value.

This will not modify existing inputs, and will add at most one change output to the outputs.

No existing outputs will be modified unless “subtractFeeFromOutputs” is specified.

Note that inputs which were signed may need to be resigned after completion since in/outputs have been added.

The inputs added will not be signed, use signrawtransactionwithkey
or signrawtransactionwithwallet for that.

Note that all existing inputs must have their previous output transaction be in the wallet.

Note that all inputs selected must be of standard form and P2SH scripts must be in the wallet using importaddress or addmultisigaddress (to calculate fees).

You can see whether this is the case by checking the “solvable” field in the listunspent output.

Only pay-to-pubkey, multisig, and P2SH versions thereof are currently supported for watch-only

Argument #1 - hexstring

Type: string, required

The hex string of the raw transaction

Argument #2 - options

Type: json object, optional

for backward compatibility: passing in a true instead of an object will result in {“includeWatching”:true}
“replaceable”: bool, (boolean, optional, default=fallback to wallet’s default) Marks this transaction as BIP125 replaceable. Allows this transaction to be replaced by a transaction with higher fees “conf_target”: n, (numeric, optional, default=fallback to wallet’s default) Confirmation target (in blocks) “estimate_mode”: “str”, (string, optional, default=UNSET) The fee estimate mode, must be one of: “UNSET” “ECONOMICAL” “CONSERVATIVE” }
{
  "changeAddress": "str",        (string, optional, default=pool address) The bitcoin address to receive the change
  "changePosition": n,           (numeric, optional, default=random) The index of the change output
  "change_type": "str",          (string, optional, default=set by -changetype) The output type to use. Only valid if changeAddress is not specified. Options are "legacy", "p2sh-segwit", and "bech32".
  "includeWatching": bool,       (boolean, optional, default=false) Also select inputs which are watch only
  "lockUnspents": bool,          (boolean, optional, default=false) Lock selected unspent outputs
  "feeRate": amount,             (numeric or string, optional, default=not set: makes wallet determine the fee) Set a specific fee rate in BTC/kB
  "subtractFeeFromOutputs": [    (json array, optional, default=empty array) A json array of integers.
                                 The fee will be equally deducted from the amount of each specified output.
                                 Those recipients will receive less bitcoins than you enter in their corresponding amount field.
                                 If no outputs are specified here, the sender pays the fee.
    vout_index,                  (numeric) The zero-based output index, before a change output is added.
    ...
  ],

Argument #3 - iswitness

Type: boolean, optional, default=depends on heuristic tests

Whether the transaction hex is a serialized witness transaction
If iswitness is not present, heuristic tests will be used in decoding

Result

{
  "hex":       "value", (string)  The resulting raw transaction (hex-encoded string)
  "fee":       n,         (numeric) Fee in BTC the resulting transaction pays
  "changepos": n          (numeric) The position of the added change output, or -1
}

Examples

Create a transaction with no inputs:

bitcoin-cli createrawtransaction "[]" "{\"myaddress\":0.01}"

Add sufficient unsigned inputs to meet the output value:

bitcoin-cli fundrawtransaction "rawtransactionhex"

Sign the transaction:

bitcoin-cli signrawtransactionwithwallet "fundedtransactionhex"

Send the transaction:

bitcoin-cli sendrawtransaction "signedtransactionhex"