A web based interface to the Bitcoin API JSON-RPC

Command: settxfee

The settxfee RPC sets the transaction fee per kilobyte paid by transactions created by this wallet.

Parameter #1—the transaction fee amount per kilobyte
Result: true on success

The P2PKH address corresponding to the private key you want returned. Must be an address corresponding to a private key in this wallet.
settxfee amount

Set the transaction fee per kB. Overwrites the paytxfee parameter.

1. amount         (numeric or string, required) The transaction fee in BTC/kB

true|false        (boolean) Returns true if successful

> bitcoin-cli settxfee 0.00001
> curl --user myusername --data-binary '{"jsonrpc": "1.0", "id":"curltest", "method": "settxfee", "params": [0.00001] }' -H 'content-type: text/plain;'