diff --git a/CryptoExchange.Net/ExtensionMethods.cs b/CryptoExchange.Net/ExtensionMethods.cs
index 3f1df21..ffb150e 100644
--- a/CryptoExchange.Net/ExtensionMethods.cs
+++ b/CryptoExchange.Net/ExtensionMethods.cs
@@ -31,6 +31,18 @@ namespace CryptoExchange.Net
             parameters.Add(key, value);
         }
 
+        /// <summary>
+        /// Add a parameter
+        /// </summary>
+        /// <param name="parameters"></param>
+        /// <param name="key"></param>
+        /// <param name="value"></param>
+        /// <param name="converter"></param>
+        public static void AddParameter(this Dictionary<string, object> parameters, string key, string value, JsonConverter converter)
+        {
+            parameters.Add(key, JsonConvert.SerializeObject(value, converter));
+        }
+
         /// <summary>
         /// Add a parameter
         /// </summary>
@@ -42,6 +54,18 @@ namespace CryptoExchange.Net
             parameters.Add(key, value);
         }
 
+        /// <summary>
+        /// Add a parameter
+        /// </summary>
+        /// <param name="parameters"></param>
+        /// <param name="key"></param>
+        /// <param name="value"></param>
+        /// <param name="converter"></param>
+        public static void AddParameter(this Dictionary<string, object> parameters, string key, object value, JsonConverter converter)
+        {
+            parameters.Add(key, JsonConvert.SerializeObject(value, converter));
+        }
+
         /// <summary>
         /// Add an optional parameter. Not added if value is null
         /// </summary>
@@ -54,6 +78,19 @@ namespace CryptoExchange.Net
                 parameters.Add(key, value);
         }
 
+        /// <summary>
+        /// Add an optional parameter. Not added if value is null
+        /// </summary>
+        /// <param name="parameters"></param>
+        /// <param name="key"></param>
+        /// <param name="value"></param>
+        /// <param name="converter"></param>
+        public static void AddOptionalParameter(this Dictionary<string, object> parameters, string key, object? value, JsonConverter converter)
+        {
+            if (value != null)
+                parameters.Add(key, JsonConvert.SerializeObject(value, converter));
+        }
+
         /// <summary>
         /// Add an optional parameter. Not added if value is null
         /// </summary>
@@ -66,6 +103,19 @@ namespace CryptoExchange.Net
                 parameters.Add(key, value);
         }
 
+        /// <summary>
+        /// Add an optional parameter. Not added if value is null
+        /// </summary>
+        /// <param name="parameters"></param>
+        /// <param name="key"></param>
+        /// <param name="value"></param>
+        /// <param name="converter"></param>
+        public static void AddOptionalParameter(this Dictionary<string, string> parameters, string key, string? value, JsonConverter converter)
+        {
+            if (value != null)
+                parameters.Add(key, JsonConvert.SerializeObject(value, converter));
+        }
+
         /// <summary>
         /// Create a query string of the specified parameters
         /// </summary>