diff --git a/sweep.py b/sweep.py
index 3b1efa1..a10e1f7 100644
--- a/sweep.py
+++ b/sweep.py
@@ -20,8 +20,8 @@ def main():
     args = ap.parse_args()
 
     cfg = iproyal.CFG.get("sweep", {})
-    threshold = iproyal.CFG.get("alerts", {}).get("low_balance_threshold", 10.0)
-    max_sats = args.cap_sats or int(cfg.get("max_sats", 100000))
+    float_target = float(cfg.get("float_target", 50.0))
+    max_sats = args.cap_sats or int(cfg.get("max_sats", 75000))
     dest = cfg.get("iproyal_btc_address", "")
 
     try:
@@ -30,22 +30,22 @@ def main():
         print(f"balance check failed: {e}")
         sys.exit(1)
 
-    if bal >= threshold:
-        print(f"balance ${bal} >= threshold ${threshold} — no top-up needed")
+    if bal >= float_target:
+        print(f"balance ${bal} >= float target ${float_target} — no top-up needed")
         return
 
+    shortfall = float_target - bal
     if not dest:
-        print("NO destination set (sweep.iproyal_btc_address). "
-              "Set it in config.json before going live.")
+        print(f"LOW: balance ${bal} is below float target ${float_target} (shortfall ${shortfall:.2f}). "
+              "Set sweep.iproyal_btc_address in config.json to enable auto-top-up.")
         return
 
     if args.live:
-        print(f"LIVE: balance ${bal} < ${threshold} — would send {max_sats} sats to {dest}")
-        # TODO: wire send() to source wallet (BTCPay hot wallet / Alby on-chain).
-        # Hard cap enforced here: never exceed max_sats.
+        print(f"LIVE: balance ${bal} < ${float_target} — would send {max_sats} sats (~${shortfall:.2f}) to {dest}")
         print("WARNING: send() not yet wired — this is a no-op placeholder.")
     else:
-        print(f"DRY-RUN: balance ${bal} < ${threshold} — would top up {max_sats} sats to {dest}")
+        print(f"DRY-RUN: balance ${bal} < float target ${float_target} (shortfall ${shortfall:.2f}) — "
+              f"would top up {max_sats} sats to {dest}")
 
 
 if __name__ == "__main__":