Add stoplossvalue interface

docs/strategy-advanced.md

@@ -8,6 +8,11 @@ If you're just getting started, please be familiar with the methods described in
 !!! Note
     All callback methods described below should only be implemented in a strategy if they are actually used.
 
+## Custom stoploss logic
+
+// TODO: Complete this section
+
+
 ## Custom order timeout rules
 
 Simple, timebased order-timeouts can be configured either via strategy or in the configuration in the `unfilledtimeout` section.

freqtrade/strategy/interface.py

@@ -254,6 +254,24 @@ class IStrategy(ABC):
         """
         return True
 
+    def stoploss_value(self, pair: str, trade: Trade, rate: float, **kwargs) -> float:
+        """
+        Define custom stoploss logic
+        The custom stoploss can never be below self.stoploss, which serves as a hard maximum loss.
+
+
+        For full documentation please go to https://www.freqtrade.io/en/latest/strategy-advanced/
+
+        When not implemented by a strategy, returns the initial stoploss value
+
+        :param pair: Pair that's about to be sold.
+        :param trade: trade object.
+        :param rate: Rate that's going to be used when using limit orders
+        :param **kwargs: Ensure to keep this here so updates to this won't break your strategy.
+        :return float: New stoploss value, relative to the open price
+        """
+        return self.stoploss
+
     def informative_pairs(self) -> ListPairsWithTimeframes:
         """
         Define additional, informative pair/interval combinations to be cached from the exchange.