diff --git a/Include/MyIncludes/DPO_Calculator.mqh b/Include/MyIncludes/DPO_Calculator.mqh
new file mode 100644
index 0000000..4b91593
--- /dev/null
+++ b/Include/MyIncludes/DPO_Calculator.mqh
@@ -0,0 +1,143 @@
+//+------------------------------------------------------------------+
+//|                                               DPO_Calculator.mqh |
+//|      Engine for calculating the Detrended Price Oscillator.      |
+//|                                        Copyright 2025, xxxxxxxx  |
+//+------------------------------------------------------------------+
+#property copyright "Copyright 2025, xxxxxxxx"
+
+#include <MyIncludes\MovingAverage_Engine.mqh>
+
+//+==================================================================+
+class CDPOCalculator
+  {
+protected:
+   int               m_period;
+   CMovingAverageCalculator *m_ma_calc;
+   double            m_price[]; // Internal price buffer
+
+   virtual bool      PreparePriceSeries(int rates_total, ENUM_APPLIED_PRICE price_type, const double &open[], const double &high[], const double &low[], const double &close[]);
+
+public:
+                     CDPOCalculator(void);
+   virtual          ~CDPOCalculator(void);
+
+   bool              Init(int period, ENUM_MA_TYPE ma_type);
+   void              Calculate(int rates_total, ENUM_APPLIED_PRICE price_type, const double &open[], const double &high[], const double &low[], const double &close[],
+                               double &dpo_buffer[]);
+  };
+
+//+------------------------------------------------------------------+
+//|                                                                  |
+//+------------------------------------------------------------------+
+class CDPOCalculator_HA : public CDPOCalculator
+  {
+public:
+                     CDPOCalculator_HA(void);
+  };
+
+//+==================================================================+
+//|                 METHOD IMPLEMENTATIONS                           |
+//+==================================================================+
+
+//+------------------------------------------------------------------+
+//|                                                                  |
+//+------------------------------------------------------------------+
+CDPOCalculator::CDPOCalculator(void) { m_ma_calc = new CMovingAverageCalculator(); }
+//+------------------------------------------------------------------+
+//|                                                                  |
+//+------------------------------------------------------------------+
+CDPOCalculator::~CDPOCalculator(void) { if(CheckPointer(m_ma_calc) != POINTER_INVALID) delete m_ma_calc; }
+//+------------------------------------------------------------------+
+//|                                                                  |
+//+------------------------------------------------------------------+
+CDPOCalculator_HA::CDPOCalculator_HA(void)
+  {
+   if(CheckPointer(m_ma_calc) != POINTER_INVALID)
+      delete m_ma_calc;
+   m_ma_calc = new CMovingAverageCalculator_HA();
+  }
+
+//+------------------------------------------------------------------+
+//|                                                                  |
+//+------------------------------------------------------------------+
+bool CDPOCalculator::Init(int period, ENUM_MA_TYPE ma_type)
+  {
+   m_period = period;
+   if(CheckPointer(m_ma_calc) == POINTER_INVALID)
+      return false;
+   return m_ma_calc.Init(period, ma_type);
+  }
+
+//+------------------------------------------------------------------+
+//|                                                                  |
+//+------------------------------------------------------------------+
+void CDPOCalculator::Calculate(int rates_total, ENUM_APPLIED_PRICE price_type, const double &open[], const double &high[], const double &low[], const double &close[],
+                               double &dpo_buffer[])
+  {
+   if(rates_total < m_period)
+      return;
+   if(CheckPointer(m_ma_calc) == POINTER_INVALID)
+      return;
+   if(!PreparePriceSeries(rates_total, price_type, open, high, low, close))
+      return;
+
+//--- Step 1: Calculate the standard, lagging MA into an internal buffer ---
+   double ma_buffer[];
+   ArrayResize(ma_buffer, rates_total);
+   m_ma_calc.Calculate(rates_total, price_type, open, high, low, close, ma_buffer);
+
+//--- Step 2: Calculate DPO by subtracting the shifted MA from the price ---
+   int shift = (m_period / 2) + 1;
+
+   for(int i = 0; i < rates_total; i++)
+     {
+      int source_index = i - shift;
+      if(source_index >= 0 && ma_buffer[source_index] != EMPTY_VALUE)
+         dpo_buffer[i] = m_price[i] - ma_buffer[source_index];
+      else
+         dpo_buffer[i] = EMPTY_VALUE;
+     }
+  }
+
+//+------------------------------------------------------------------+
+//|                                                                  |
+//+------------------------------------------------------------------+
+bool CDPOCalculator::PreparePriceSeries(int rates_total, ENUM_APPLIED_PRICE price_type, const double &open[], const double &high[], const double &low[], const double &close[])
+  {
+   if(ArraySize(m_price) != rates_total)
+      if(ArrayResize(m_price, rates_total) != rates_total)
+         return false;
+
+   switch(price_type)
+     {
+      case PRICE_CLOSE:
+         ArrayCopy(m_price, close, 0, 0, rates_total);
+         break;
+      case PRICE_OPEN:
+         ArrayCopy(m_price, open, 0, 0, rates_total);
+         break;
+      case PRICE_HIGH:
+         ArrayCopy(m_price, high, 0, 0, rates_total);
+         break;
+      case PRICE_LOW:
+         ArrayCopy(m_price, low, 0, 0, rates_total);
+         break;
+      case PRICE_MEDIAN:
+         for(int i=0; i<rates_total; i++)
+            m_price[i] = (high[i]+low[i])/2.0;
+         break;
+      case PRICE_TYPICAL:
+         for(int i=0; i<rates_total; i++)
+            m_price[i] = (high[i]+low[i]+close[i])/3.0;
+         break;
+      case PRICE_WEIGHTED:
+         for(int i=0; i<rates_total; i++)
+            m_price[i] = (high[i]+low[i]+close[i]+close[i])/4.0;
+         break;
+      default:
+         return false;
+     }
+   return true;
+  }
+//+------------------------------------------------------------------+
+//+------------------------------------------------------------------+