Threshold rebalancing (#37)

* Creates config variable

* Comments adjustments

* Adds checks for rebalance_threshold

* Backwards compatibility

* Adds logic for Rebalance thresholds

* Writes documentation

* Threshold orders should also be greater than or equal to the min_order_value

* Corrects default value

PieBot.py

@@ -7,8 +7,23 @@
 pre_flight_checks()
 
 
+# Hard codes the minimum order value
 min_order_value = 0.25
 
+# Checks whether the Rebalance threshold has been defined, and allows the bot to run if it hasn't
+try:
+    rebalance_threshold
+except NameError:
+    rebalance_threshold = None
+
+if rebalance_threshold is None:
+    uses_threshold = False
+else:
+    if rebalance_threshold > 0:
+        uses_threshold = True
+    else:
+        uses_threshold = False
+
 
 # Buy more coins at a regular interval
 def buy(pairs):
@@ -86,21 +101,37 @@ def rebalance(pairs):
         coin_price = pair[2]
         pair_value = pair[3]
 
-        # If the coin value is over target, sell the excess if it's difference is greater than or equal to the minimum order value
+        # The coin value is over target
         if pair_value > target_per_coin:
             difference = pair_value - target_per_coin
 
             if difference >= min_order_value:
-                order_value = difference / coin_price
-                sell_orders_data.append([pair[0], pair[1], order_value, difference])
+                if uses_threshold:
+                    difference_percentage = (((pair_value - target_per_coin) / target_per_coin) * 100)
 
-        # If the coin value is under target, buy more if it's difference is greater than or equal to the minimum order value
+                    if difference_percentage >= (rebalance_threshold * 100):
+                        order_value = difference / coin_price
+                        sell_orders_data.append([pair[0], pair[1], order_value, difference])
+
+                else:
+                    order_value = difference / coin_price
+                    sell_orders_data.append([pair[0], pair[1], order_value, difference])
+
+        # The coin value is under target
         elif pair_value < target_per_coin:
             difference = target_per_coin - pair_value
 
             if difference >= min_order_value:
-                order_value = difference
-                buy_orders_data.append([pair[0], pair[1], order_value, difference])
+                if uses_threshold:
+                    difference_percentage = (((target_per_coin - pair_value) / pair_value) * 100)
+
+                    if difference_percentage >= (rebalance_threshold * 100):
+                        order_value = difference
+                        buy_orders_data.append([pair[0], pair[1], order_value, difference])
+
+                else:
+                    order_value = difference
+                    buy_orders_data.append([pair[0], pair[1], order_value, difference])
 
     if len(sell_orders_data) >= 1:
         for order in sell_orders_data:

README.md

@@ -16,6 +16,7 @@ PieBot is a DCA (Dollar Cost Averaging) cryptocurrency trading bot, built with P
     - [pair_list](#pair_list)
     - [buy_frequency](#buy_frequency)
     - [rebalance_frequency](#rebalance_frequency)
+    - [rebalance_threshold](#rebalance_threshold)
     - [buy_order_value](#buy_order_value)
     - [usdt_reserve](#usdt_reserve)
   - [Operation](#operation)
@@ -152,6 +153,22 @@ You can stop the Rebalance task from running by setting the value as `0`. In thi
 
 ---
 
+#### rebalance_threshold
+
+Sets the desired price deviation a coin must meet before it is rebalanced.
+
+By specifying a target percentage, rather than just requiring the deviation to be greater than or equal to the minimum order value, you dramatically reduce the number of trades PieBot completes in any given cycle, which can help reduce fees.
+
+For example, if `rebalance_threshold` is set to `0.025`, then each coin pair must be greater than or equal to 2.5% above or below the target coin price. So, coins that are within the 0% - 2.49999...% window will not be rebalanced in this cycle.
+
+The value reflects a percentage, and should be between `0` and `1`.
+
+For example, 5% = `0.05`, 15% = `0.15` etc.
+
+**Default value** - `0.03`
+
+---
+
 #### buy_order_value
 
 The USDT value that PieBot will buy for each enabled coin pair in the Buy task.
@@ -164,7 +181,9 @@ For example, with 10 enabled coin pairs, and a `buy_order_value` of `0.5`, the B
 
 #### usdt_reserve
 
-This value tells PieBot how much USDT it should keep aside to not trade with. The value reflects a percentage, and should be between `0` and `1`.
+This value tells PieBot how much USDT it should keep aside to not trade with.
+
+The value reflects a percentage, and should be between `0` and `1`.
 
 For example, 5% = `0.05`, 15% = `0.15` etc.
 

_config-example.py

@@ -20,6 +20,11 @@
 buy_frequency = 6
 rebalance_frequency = 1
 
+# The required value deviation before the coin is rebalanced.  This is a percentage
+# 0.05 = 5%
+# 0.15 = 15%
+rebalance_threshold = 0.03
+
 # The USDT value that PieBot will buy for each enabled coin pair in the "Buy" task
 buy_order_value = 0.50