Merge pull request #5347 from Axel-CH/custom_order_price

Custom order price

freqtrade/constants.py

@@ -191,6 +191,9 @@ CONF_SCHEMA = {
             },
             'required': ['price_side']
         },
+        'custom_price_max_distance_ratio': {
+           'type': 'number', 'minimum': 0.0
+        },
         'order_types': {
             'type': 'object',
             'properties': {

freqtrade/freqtradebot.py

@@ -479,7 +479,13 @@ class FreqtradeBot(LoggingMixin):
             buy_limit_requested = price
         else:
             # Calculate price
-            buy_limit_requested = self.exchange.get_rate(pair, refresh=True, side="buy")
+            proposed_buy_rate = self.exchange.get_rate(pair, refresh=True, side="buy")
+            custom_entry_price = strategy_safe_wrapper(self.strategy.custom_entry_price,
+                                                       default_retval=proposed_buy_rate)(
+                pair=pair, current_time=datetime.now(timezone.utc),
+                proposed_rate=proposed_buy_rate)
+
+            buy_limit_requested = self.get_valid_price(custom_entry_price, proposed_buy_rate)
 
         if not buy_limit_requested:
             raise PricingError('Could not determine buy price.')
@@ -1076,6 +1082,17 @@ class FreqtradeBot(LoggingMixin):
            and self.strategy.order_types['stoploss_on_exchange']:
             limit = trade.stop_loss
 
+        # set custom_exit_price if available
+        proposed_limit_rate = limit
+        current_profit = trade.calc_profit_ratio(limit)
+        custom_exit_price = strategy_safe_wrapper(self.strategy.custom_exit_price,
+                                                  default_retval=proposed_limit_rate)(
+            pair=trade.pair, trade=trade,
+            current_time=datetime.now(timezone.utc),
+            proposed_rate=proposed_limit_rate, current_profit=current_profit)
+
+        limit = self.get_valid_price(custom_exit_price, proposed_limit_rate)
+
         # First cancelling stoploss on exchange ...
         if self.strategy.order_types.get('stoploss_on_exchange') and trade.stoploss_order_id:
             try:
@@ -1375,3 +1392,26 @@ class FreqtradeBot(LoggingMixin):
                                               amount=amount, fee_abs=fee_abs)
         else:
             return amount
+
+    def get_valid_price(self, custom_price: float, proposed_price: float) -> float:
+        """
+        Return the valid price.
+        Check if the custom price is of the good type if not return proposed_price
+        :return: valid price for the order
+        """
+        if custom_price:
+            try:
+                valid_custom_price = float(custom_price)
+            except ValueError:
+                valid_custom_price = proposed_price
+        else:
+            valid_custom_price = proposed_price
+
+        cust_p_max_dist_r = self.config.get('custom_price_max_distance_ratio', 0.02)
+        min_custom_price_allowed = proposed_price - (proposed_price * cust_p_max_dist_r)
+        max_custom_price_allowed = proposed_price + (proposed_price * cust_p_max_dist_r)
+
+        # Bracket between min_custom_price_allowed and max_custom_price_allowed
+        return max(
+            min(valid_custom_price, max_custom_price_allowed),
+            min_custom_price_allowed)

freqtrade/strategy/interface.py

@@ -280,6 +280,43 @@ class IStrategy(ABC, HyperStrategyMixin):
         """
         return self.stoploss
 
+    def custom_entry_price(self, pair: str, current_time: datetime, proposed_rate: float,
+                           **kwargs) -> float:
+        """
+        Custom entry price logic, returning the new entry price.
+
+        For full documentation please go to https://www.freqtrade.io/en/latest/strategy-advanced/
+
+        When not implemented by a strategy, returns None, orderbook is used to set entry price
+
+        :param pair: Pair that's currently analyzed
+        :param current_time: datetime object, containing the current datetime
+        :param proposed_rate: Rate, calculated based on pricing settings in ask_strategy.
+        :param **kwargs: Ensure to keep this here so updates to this won't break your strategy.
+        :return float: New entry price value if provided
+        """
+        return proposed_rate
+
+    def custom_exit_price(self, pair: str, trade: Trade,
+                          current_time: datetime, proposed_rate: float,
+                          current_profit: float, **kwargs) -> float:
+        """
+        Custom exit price logic, returning the new exit price.
+
+        For full documentation please go to https://www.freqtrade.io/en/latest/strategy-advanced/
+
+        When not implemented by a strategy, returns None, orderbook is used to set exit price
+
+        :param pair: Pair that's currently analyzed
+        :param trade: trade object.
+        :param current_time: datetime object, containing the current datetime
+        :param proposed_rate: Rate, calculated based on pricing settings in ask_strategy.
+        :param current_profit: Current profit (as ratio), calculated based on current_rate.
+        :param **kwargs: Ensure to keep this here so updates to this won't break your strategy.
+        :return float: New exit price value if provided
+        """
+        return proposed_rate
+
     def custom_sell(self, pair: str, trade: Trade, current_time: datetime, current_rate: float,
                     current_profit: float, **kwargs) -> Optional[Union[str, bool]]:
         """