diff --git a/krakendca/dca.py b/krakendca/dca.py
index 5849a15..bcb6a56 100644
--- a/krakendca/dca.py
+++ b/krakendca/dca.py
@@ -173,7 +173,7 @@ def check_account_balance(self) -> None:
 
         :return: None
         """
-        trade_balance = self.ka.get_trade_balance().get("eb")
+        trade_balance = self.ka.get_trade_balance().get("tb")
         logger.info(f"Current trade balance: {trade_balance} ZUSD.")
         balance = self.ka.get_balance()
         try:
@@ -190,7 +190,9 @@ def check_account_balance(self) -> None:
             f"Pair balances: {pair_quote_balance} {self.pair.quote}, "
             f"{pair_base_balance} {self.pair.base}."
         )
-        if pair_quote_balance < self.amount:
+        # Use trade balance (tb) as the authoritative available funds
+        available = float(trade_balance) if trade_balance else 0
+        if available < self.amount:
             raise ValueError(
                 f"Insufficient funds to buy {self.amount} "
                 f"{self.pair.quote} of {self.pair.base}"