Deduction before splitting for fees

bot.py

@@ -187,9 +187,10 @@ def run_cycle(config: Config) -> bool:
         return bool(closed)
 
     to_buy = opportunities[:num_to_buy]
-    # Deduct fee reserve before splitting so each order has room for Kraken's taker fee
+    # Deduct fee reserve before splitting so each order has room for Kraken's taker fee.
+    # Floor to the nearest cent so floating point never pushes us over the available balance.
     fee_multiplier = 1 - (config.taker_fee_pct / 100)
-    alloc_per_asset = (balance * fee_multiplier) / num_to_buy
+    alloc_per_asset = math.floor((balance * fee_multiplier / num_to_buy) * 100) / 100
     log.info(
         "Buying %d asset(s) @ $%.2f each (total $%.2f, %.1f%% fee reserve applied)",
         num_to_buy, alloc_per_asset, alloc_per_asset * num_to_buy, config.taker_fee_pct,

config.py

@@ -23,7 +23,7 @@ class Config:
     # Portfolio limits
     max_positions: int = 5        # Maximum concurrent holdings
     min_order_usd: float = 15.0   # Kraken minimum is ~$10; keep a small buffer
-    taker_fee_pct: float = 0.4    # Reserve this % per order for Kraken's taker fee (actual ~0.26%)
+    taker_fee_pct: float = 1.5    # Reserve this % of balance for fees/rounding (Kraken actual ~0.26%)
 
     # ── Risk management ──────────────────────────────────────────────────────
     # Trailing stop: sell if price drops this % below its peak since purchase.