diff --git a/PocketSharp/APIException.cs b/PocketSharp/APIException.cs
new file mode 100644
index 0000000..b1f4bc5
--- /dev/null
+++ b/PocketSharp/APIException.cs
@@ -0,0 +1,28 @@
+using System;
+using System.Runtime.Serialization;
+
+namespace PocketSharp
+{
+  class APIException
+  {
+    [Serializable]
+    public class APIException : Exception
+    {
+      /// <summary>
+      /// necessary constructors for the exception 
+      /// including inner exceptions and serialization
+      /// </summary>
+      public APIException()
+        : base() { }
+
+      public APIException(string message)
+        : base(message) { }
+
+      public APIException(string message, Exception innerException)
+        : base(message, innerException) { }
+
+      protected APIException(SerializationInfo info, StreamingContext context)
+        : base(info, context) { }
+    }
+  }
+}