diff --git a/Runtime/codebase/IWalletBase.cs b/Runtime/codebase/IWalletBase.cs
index c63d8b6a..83f04d99 100644
--- a/Runtime/codebase/IWalletBase.cs
+++ b/Runtime/codebase/IWalletBase.cs
@@ -105,6 +105,13 @@ public interface IWalletBase
         /// <returns></returns>
         Task<byte[]> SignMessage(byte[] message);
 
+        /// <summary>
+        /// Sign a UTF-8 encoded string message
+        /// </summary>
+        /// <param name="message">The string message to sign</param>
+        /// <returns>The signature bytes</returns>
+        Task<byte[]> SignMessage(string message);
+
         /// <summary>
         /// Sign and send a transaction
         /// </summary>
diff --git a/Runtime/codebase/WalletBase.cs b/Runtime/codebase/WalletBase.cs
index ab7835a3..a6b819f9 100644
--- a/Runtime/codebase/WalletBase.cs
+++ b/Runtime/codebase/WalletBase.cs
@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Text;
 using System.Linq;
 using System.Threading.Tasks;
 using Cysharp.Threading.Tasks;
@@ -264,6 +265,16 @@ public virtual async Task<RequestResult<string>> SignAndSendTransaction
         /// <inheritdoc />
         public abstract Task<byte[]> SignMessage(byte[] message);
 
+        /// <summary>
+        /// Sign a UTF-8 encoded string message
+        /// </summary>
+        /// <param name="message">The string message to sign</param>
+        /// <returns>The signature bytes</returns>
+        public Task<byte[]> SignMessage(string message)
+        {
+            return SignMessage(Encoding.UTF8.GetBytes(message));
+        }
+
         /// <summary>
         /// Airdrop sol on wallet
         /// </summary>