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lightning-fundpsbt - Command to populate PSBT inputs from the wallet

fundpsbt satoshi feerate startweight [minconf] [reserve] [locktime] [min_witness_weight] [excess_as_change]

fundpsbt is a low-level RPC command which creates a PSBT using unreserved inputs in the wallet, optionally reserving them as well.

satoshi is the minimum satoshi value of the output(s) needed (or the string "all" meaning use all unreserved inputs). If a value, it can be a whole number, a whole number ending in sat, a whole number ending in 000msat, or a number with 1 to 8 decimal places ending in btc.

feerate can be one of the feerates listed in lightning-feerates(7), or one of the strings urgent (aim for next block), normal (next 4 blocks or so) or slow (next 100 blocks or so) to use lightningd's internal estimates. It can also be a feerate is a number, with an optional suffix: perkw means the number is interpreted as satoshi-per-kilosipa (weight), and perkb means it is interpreted bitcoind-style as satoshi-per-kilobyte. Omitting the suffix is equivalent to perkb.

startweight is the weight of the transaction before fundpsbt has added any inputs.

minconf specifies the minimum number of confirmations that used outputs should have. Default is 1.

reserve is either boolean or a number: if true or a non-zero number then reserveinputs is called (successfully, with exclusive true) on the returned PSBT for this number of blocks (or 72 blocks if reserve is simply true).

locktime is an optional locktime: if not set, it is set to a recent block height.

min_witness_weight is an optional minimum weight to use for a UTXO's witness. If the actual witness weight is greater than the provided minimum, the actual witness weight will be used.

excess_as_change is an optional boolean to flag to add a change output for the excess sats.

Let's assume the caller is trying to produce a 100,000 satoshi output.

First, the caller estimates the weight of the core (typically 42) and known outputs of the transaction (typically (9 + scriptlen) * 4). For a simple P2WPKH it's a 22 byte scriptpubkey, so that's 124 weight.

It calls "fundpsbt 100000sat slow 166", which succeeds, and returns the psbt and feerate_per_kw it used, the estimated_final_weight and any excess_msat.

If excess_msat is greater than the cost of adding a change output, the caller adds a change output randomly to position 0 or 1 in the PSBT. Say feerate_per_kw is 253, and the change output is a P2WPKH (weight 124), the cost is around 31 sats. With the dust limit disallowing payments below 546 satoshis, we would only create a change output if excess_msat was greater or equal to 31 + 546.

On success, an object is returned, containing:

psbt (string): Unsigned PSBT which fulfills the parameters given
feerate_per_kw (u32): The feerate used to create the PSBT, in satoshis-per-kiloweight
estimated_final_weight (u32): The estimated weight of the transaction once fully signed
excess_msat (msat): The amount above satoshi which is available. This could be zero, or dust; it will be zero if change_outnum is also returned
change_outnum (u32, optional): The 0-based output number where change was placed (only if parameter excess_as_change was true and there was sufficient funds)
reservations (array of objects, optional): If reserve was true or a non-zero number, just as per lightning-reserveinputs(7):
txid (txid): The txid of the transaction
vout (u32): The 0-based output number
was_reserved (boolean): Whether this output was previously reserved (always false)
reserved (boolean): Whether this output is now reserved (always true)
reserved_to_block (u32): The blockheight the reservation will expire

If excess_as_change is true and the excess is enough to cover an additional output above the dust_limit, then an output is added to the PSBT for the excess amount. The excess_msat will be zero. A change_outnum will be returned with the index of the change output.

On error the returned object will contain code and message properties, with code being one of the following:

-32602: If the given parameters are wrong.
-1: Catchall nonspecific error.
301: Insufficient UTXOs to meet satoshi value.

Rusty Russell <> is mainly responsible.

lightning-utxopsbt(7), lightning-reserveinputs(7), lightning-unreserveinputs(7).

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