PSBT: Below is a minimal, production-safe version that does the following: python3 itc_cli.py <destination_address> <amount> No CSV, no shares, no batching, no previews — just: validate address create PSBT sign finalize broadcast Uses walletcreatefundedpsbt so fees come from change (exact send).

itc_cli.py

#!/usr/bin/env python3

import os
import sys
import argparse
from decimal import Decimal, ROUND_DOWN, getcontext
import requests
from requests.auth import HTTPBasicAuth

getcontext().prec = 28
SAT8 = Decimal("0.00000001")

# ---------- Helpers ----------
def quant8(x: Decimal) -> Decimal:
    return x.quantize(SAT8, rounding=ROUND_DOWN)

def rpc_call(method, params, args):
    url = f"http://{args.rpc_host}:{args.rpc_port}/wallet/{args.wallet}"
    payload = {
        "jsonrpc": "1.0",
        "id": "send",
        "method": method,
        "params": params
    }
    auth = HTTPBasicAuth(args.rpc_user, args.rpc_pass)
    r = requests.post(url, json=payload, auth=auth, timeout=30)
    r.raise_for_status()
    data = r.json()
    if data.get("error"):
        raise SystemExit(f"RPC error: {data['error']}")
    return data["result"]

# ---------- Main ----------
def main():
    ap = argparse.ArgumentParser(description="Send ITC via PSBT")
    ap.add_argument("address", help="Destination ITC address")
    ap.add_argument("amount", type=Decimal, help="Amount to send")
    ap.add_argument("--wallet", default=os.getenv("RPC_WALLET", "default"))
    ap.add_argument("--rpc-host", default="127.0.0.1")
    ap.add_argument("--rpc-port", default="8332")
    ap.add_argument("--rpc-user", default=os.getenv("RPC_USER"))
    ap.add_argument("--rpc-pass", default=os.getenv("RPC_PASS"))
    ap.add_argument("--rbf", action="store_true", help="Enable RBF")
    ap.add_argument("--conf-target", type=int, default=6)
    ap.add_argument("--fee-rate", type=Decimal, help="Optional fee rate (per kB)")
    args = ap.parse_args()

    amount = quant8(args.amount)
    if amount <= 0:
        raise SystemExit("Amount must be positive")

    # Validate address
    val = rpc_call("validateaddress", [args.address], args)
    if not val.get("isvalid"):
        raise SystemExit("Invalid destination address")

    outputs = {args.address: float(amount)}

    opts = {
        "replaceable": args.rbf,
        "change_type": "bech32"
    }

    if args.fee_rate:
        opts["feeRate"] = float(args.fee_rate)
    else:
        opts["conf_target"] = args.conf_target

    # Create PSBT
    psbt = rpc_call(
        "walletcreatefundedpsbt",
        [[], outputs, 0, opts, True],
        args
    )

    # Sign
    processed = rpc_call(
        "walletprocesspsbt",
        [psbt["psbt"], True, "ALL", True],
        args
    )

    # Finalize
    final = rpc_call("finalizepsbt", [processed["psbt"]], args)
    if not final.get("complete"):
        raise SystemExit("PSBT not complete")

    # Broadcast
    txid = rpc_call("sendrawtransaction", [final["hex"]], args)

    print("✅ Transaction sent")
    print("TXID:", txid)

if __name__ == "__main__":
    main()