Implement last_stake_amount_min_ratio

freqtrade/constants.py

@@ -80,6 +80,9 @@ CONF_SCHEMA = {
             'default': 0.99
         },
         'amend_last_stake_amount': {'type': 'boolean', 'default': False},
+        'last_stake_amount_min_ratio': {
+            'type': 'number', 'minimum': 0.0, 'maximum': 1.0, 'default': 0.5
+            },
         'fiat_display_currency': {'type': 'string', 'enum': SUPPORTED_FIAT},
         'dry_run': {'type': 'boolean'},
         'dry_run_wallet': {'type': 'number', 'default': DRY_RUN_WALLET},
@@ -284,6 +287,7 @@ SCHEMA_TRADE_REQUIRED = [
     'stake_currency',
     'stake_amount',
     'tradable_balance_ratio',
+    'last_stake_amount_min_ratio',
     'dry_run',
     'dry_run_wallet',
     'bid_strategy',

freqtrade/freqtradebot.py

@@ -312,7 +312,12 @@ class FreqtradeBot:
         available_amount = self._get_available_stake_amount()
 
         if self.config['amend_last_stake_amount']:
-            stake_amount = min(stake_amount, available_amount)
+            # Remaining amount needs to be at least stake_amount * last_stake_amount_min_ratio
+            # Otherwise the remaining amount is too low to trade.
+            if available_amount > (stake_amount * self.config['last_stake_amount_min_ratio']):
+                stake_amount = min(stake_amount, available_amount)
+            else:
+                stake_amount = 0
 
         if available_amount < stake_amount:
             raise DependencyException(