diff --git a/CryptoExchange.Net/Authentication/ApiCredentials.cs b/CryptoExchange.Net/Authentication/ApiCredentials.cs
index c248ba4..10a9187 100644
--- a/CryptoExchange.Net/Authentication/ApiCredentials.cs
+++ b/CryptoExchange.Net/Authentication/ApiCredentials.cs
@@ -20,6 +20,11 @@ namespace CryptoExchange.Net.Authentication
         /// </summary>
         public string Secret { get; set; }
 
+        /// <summary>
+        /// The api passphrase. Not needed on all exchanges
+        /// </summary>
+        public string? Pass { get; set; }
+
         /// <summary>
         /// Type of the credentials
         /// </summary>
@@ -32,6 +37,18 @@ namespace CryptoExchange.Net.Authentication
         /// <param name="secret">The api secret or private key used for signing</param>
         /// <param name="credentialType">The type of credentials</param>
         public ApiCredentials(string key, string secret, ApiCredentialsType credentialType = ApiCredentialsType.Hmac)
+            : this(key, secret, null, credentialType)
+        {
+        }
+
+        /// <summary>
+        /// Create Api credentials providing an api key, secret and pass for authentication
+        /// </summary>
+        /// <param name="key">The api key / label used for identification</param>
+        /// <param name="secret">The api secret or private key used for signing</param>
+        /// <param name="pass">The api pass for the key. Not always needed</param>
+        /// <param name="credentialType">The type of credentials</param>
+        public ApiCredentials(string key, string secret, string? pass, ApiCredentialsType credentialType = ApiCredentialsType.Hmac)
         {
             if (string.IsNullOrEmpty(key) || string.IsNullOrEmpty(secret))
                 throw new ArgumentException("Key and secret can't be null/empty");
@@ -39,6 +56,7 @@ namespace CryptoExchange.Net.Authentication
             CredentialType = credentialType;
             Key = key;
             Secret = secret;
+            Pass = pass;
         }
 
         /// <summary>
@@ -47,7 +65,7 @@ namespace CryptoExchange.Net.Authentication
         /// <returns></returns>
         public virtual ApiCredentials Copy()
         {
-            return new ApiCredentials(Key, Secret, CredentialType);
+            return new ApiCredentials(Key, Secret, Pass, CredentialType);
         }
     }
 }