diff --git a/Thirdweb.Tests/Thirdweb.Utils/Thirdweb.Utils.Tests.cs b/Thirdweb.Tests/Thirdweb.Utils/Thirdweb.Utils.Tests.cs
index 4bff4092..35afbb31 100644
--- a/Thirdweb.Tests/Thirdweb.Utils/Thirdweb.Utils.Tests.cs
+++ b/Thirdweb.Tests/Thirdweb.Utils/Thirdweb.Utils.Tests.cs
@@ -1,4 +1,5 @@
 using System.Numerics;
+using Newtonsoft.Json.Linq;
 
 namespace Thirdweb.Tests.Utilities;
 
@@ -506,7 +507,7 @@ public async void ToJsonExternalWalletFriendly_ReturnsCorrectValue4()
         var verifyingContract = await pkWallet.GetAddress(); // doesn't matter here
         var typedDataRaw = EIP712.GetTypedDefinition_SmartAccount_AccountMessage("Account", "1", 137, verifyingContract);
         var json = Utils.ToJsonExternalWalletFriendly(typedDataRaw, msg);
-        var jsonObject = Newtonsoft.Json.Linq.JObject.Parse(json);
+        var jsonObject = JObject.Parse(json);
         var internalMsg = jsonObject.SelectToken("$.message.message");
         Assert.NotNull(internalMsg);
         Assert.Equal("0x01020304", internalMsg);
@@ -763,4 +764,106 @@ public async Task FetchGasFees_Celo()
         Assert.True(maxPrio > 0);
         Assert.Equal(maxFee, maxPrio);
     }
+
+    [Fact]
+    public void PreprocessTypedDataJson_FormatsBigIntegers()
+    {
+        // Arrange
+        var inputJson =
+            /*lang=json,strict*/
+            @"
+        {
+            ""from"": 973250616940336452028326648501327235277017847475,
+            ""data"": ""0x"",
+            ""nested"": {
+                ""value"": 4294967295
+            },
+            ""array"": [
+                123,
+                973250616940336452028326648501327235277017847475
+            ]
+        }";
+
+        var expectedJson =
+            /*lang=json,strict*/
+            @"
+        {
+            ""from"": ""973250616940336452028326648501327235277017847475"",
+            ""data"": ""0x"",
+            ""nested"": {
+                ""value"": 4294967295
+            },
+            ""array"": [
+                123,
+                ""973250616940336452028326648501327235277017847475""
+            ]
+        }";
+
+        // Act
+        var processedJson = Utils.PreprocessTypedDataJson(inputJson);
+
+        // Assert
+        var expectedJObject = JObject.Parse(expectedJson);
+        var processedJObject = JObject.Parse(processedJson);
+
+        Assert.Equal(expectedJObject, processedJObject);
+    }
+
+    [Fact]
+    public void PreprocessTypedDataJson_NoLargeNumbers_NoChange()
+    {
+        // Arrange
+        var inputJson =
+            /*lang=json,strict*/
+            @"
+        {
+            ""value"": 123,
+            ""nested"": {
+                ""value"": 456
+            },
+            ""array"": [1, 2, 3]
+        }";
+
+        // Act
+        var processedJson = Utils.PreprocessTypedDataJson(inputJson);
+        var expectedJObject = JObject.Parse(inputJson);
+        var processedJObject = JObject.Parse(processedJson);
+
+        // Assert
+        Assert.Equal(expectedJObject, processedJObject);
+    }
+
+    [Fact]
+    public void PreprocessTypedDataJson_NestedLargeNumbers()
+    {
+        // Arrange
+        var inputJson =
+            /*lang=json,strict*/
+            @"
+        {
+            ""nested"": {
+                ""value"": 973250616940336452028326648501327235277017847475
+            },
+            ""array"": [123, 973250616940336452028326648501327235277017847475]
+        }";
+
+        var expectedJson =
+            /*lang=json,strict*/
+            @"
+        {
+            ""nested"": {
+                ""value"": ""973250616940336452028326648501327235277017847475""
+            },
+            ""array"": [123, ""973250616940336452028326648501327235277017847475""]
+        }";
+
+        // Act
+        var processedJson = Utils.PreprocessTypedDataJson(inputJson);
+
+        // Assert
+        var expectedJObject = JObject.Parse(expectedJson);
+        var processedJObject = JObject.Parse(processedJson);
+
+        Assert.Equal(expectedJObject, processedJObject);
+    }
 }
diff --git a/Thirdweb/Thirdweb.Utils/Utils.cs b/Thirdweb/Thirdweb.Utils/Utils.cs
index 4d955290..c4b32ad3 100644
--- a/Thirdweb/Thirdweb.Utils/Utils.cs
+++ b/Thirdweb/Thirdweb.Utils/Utils.cs
@@ -953,4 +953,54 @@ public static async Task<SocialProfiles> GetSocialProfiles(ThirdwebClient client
 
         return new SocialProfiles(deserializedResponse.Data);
     }
+
+    /// <summary>
+    /// Preprocesses the typed data JSON to stringify large numbers.
+    /// </summary>
+    /// <param name="json">The typed data JSON.</param>
+    /// <returns>The preprocessed typed data JSON.</returns>
+    public static string PreprocessTypedDataJson(string json)
+    {
+        var jObject = JObject.Parse(json);
+
+        static void StringifyLargeNumbers(JToken token)
+        {
+            if (token is JObject obj)
+            {
+                foreach (var property in obj.Properties().ToList())
+                {
+                    StringifyLargeNumbers(property.Value);
+                }
+            }
+            else if (token is JArray array)
+            {
+                foreach (var item in array.ToList())
+                {
+                    StringifyLargeNumbers(item);
+                }
+            }
+            else if (token is JValue value)
+            {
+                if (value.Type == JTokenType.Integer)
+                {
+                    try
+                    {
+                        var bigInt = BigInteger.Parse(value.ToString());
+                        if (bigInt > new BigInteger(uint.MaxValue) || bigInt < BigInteger.Zero)
+                        {
+                            value.Replace(bigInt.ToString());
+                        }
+                    }
+                    catch (FormatException)
+                    {
+                        // Skip if the value isn't properly formatted as an integer
+                    }
+                }
+            }
+        }
+
+        StringifyLargeNumbers(jObject);
+
+        return jObject.ToString();
+    }
 }
diff --git a/Thirdweb/Thirdweb.Wallets/InAppWallet/EcosystemWallet/EcosystemWallet.cs b/Thirdweb/Thirdweb.Wallets/InAppWallet/EcosystemWallet/EcosystemWallet.cs
index c0888835..ba32ba78 100644
--- a/Thirdweb/Thirdweb.Wallets/InAppWallet/EcosystemWallet/EcosystemWallet.cs
+++ b/Thirdweb/Thirdweb.Wallets/InAppWallet/EcosystemWallet/EcosystemWallet.cs
@@ -776,9 +776,11 @@ public async Task<string> SignTypedDataV4(string json)
             throw new ArgumentNullException(nameof(json), "Json to sign cannot be null.");
         }
 
+        var processedJson = Utils.PreprocessTypedDataJson(json);
+
         var url = $"{ENCLAVE_PATH}/sign-typed-data";
 
-        var requestContent = new StringContent(json, Encoding.UTF8, "application/json");
+        var requestContent = new StringContent(processedJson, Encoding.UTF8, "application/json");
 
         var response = await this.HttpClient.PostAsync(url, requestContent).ConfigureAwait(false);
         _ = response.EnsureSuccessStatusCode();