Add bid_last_balance parameter

to interpolate sell prices

closes #3270

freqtrade/constants.py

@@ -165,6 +165,12 @@ CONF_SCHEMA = {
             'type': 'object',
             'properties': {
                 'price_side': {'type': 'string', 'enum': ORDERBOOK_SIDES, 'default': 'ask'},
+                'bid_last_balance': {
+                    'type': 'number',
+                    'minimum': 0,
+                    'maximum': 1,
+                    'exclusiveMaximum': False,
+                },
                 'use_order_book': {'type': 'boolean'},
                 'order_book_min': {'type': 'integer', 'minimum': 1},
                 'order_book_max': {'type': 'integer', 'minimum': 1, 'maximum': 50},

freqtrade/freqtradebot.py

@@ -432,7 +432,7 @@ class FreqtradeBot(LoggingMixin):
             ticker = self.exchange.fetch_ticker(pair)
             ticker_rate = ticker[bid_strategy['price_side']]
             if ticker['last'] and ticker_rate > ticker['last']:
-                balance = self.config['bid_strategy']['ask_last_balance']
+                balance = bid_strategy['ask_last_balance']
                 ticker_rate = ticker_rate + balance * (ticker['last'] - ticker_rate)
             used_rate = ticker_rate
 
@@ -745,7 +745,13 @@ class FreqtradeBot(LoggingMixin):
                 logger.warning("Sell Price at location from orderbook could not be determined.")
                 raise PricingError from e
         else:
-            rate = self.exchange.fetch_ticker(pair)[ask_strategy['price_side']]
+            ticker = self.exchange.fetch_ticker(pair)
+            ticker_rate = ticker[ask_strategy['price_side']]
+            if ticker['last'] and ticker_rate < ticker['last']:
+                balance = ask_strategy.get('bid_last_balance', 0.0)
+                ticker_rate = ticker_rate - balance * (ticker_rate - ticker['last'])
+            rate = ticker_rate
+
         if rate is None:
             raise PricingError(f"Sell-Rate for {pair} was empty.")
         self._sell_rate_cache[pair] = rate