diff --git a/WalletWasabi.WabiSabiClientLibrary.Tests/IntegrationTests/TestVectors/GetAnonymityScores.json b/WalletWasabi.WabiSabiClientLibrary.Tests/IntegrationTests/TestVectors/GetAnonymityScores.json
index a7803cbc66b..bea95ecf484 100644
--- a/WalletWasabi.WabiSabiClientLibrary.Tests/IntegrationTests/TestVectors/GetAnonymityScores.json
+++ b/WalletWasabi.WabiSabiClientLibrary.Tests/IntegrationTests/TestVectors/GetAnonymityScores.json
@@ -56,5 +56,56 @@
         }
       ]
     }
+  },
+  {
+    "name": "",
+    "request": {
+      "transactions": [
+        {
+          "internalInputs": [
+            {
+              "address": "bcrt1p0hghqgks9z83pwh3a3jzq3eldgzj8ezjrs247szks3w2nq7s7fhsqtqgg7",
+              "value": 20000000
+            }
+          ],
+          "externalInputs": [],
+          "internalOutputs": [],
+          "externalOutputs": []
+        }
+      ]
+    },
+    "expectedStatusCode": 500,
+    "expectedResponse": {
+      "description": "There is an internal input that references a non-existing transaction."
+    }
+  },
+  {
+    "name": "",
+    "request": {},
+    "expectedStatusCode": 500,
+    "expectedResponse": {
+      "description": "The Transactions field is required."
+    }
+  },
+  {
+    "name": "",
+    "request": {
+      "transactions": [
+        {
+          "internalInputs": [
+            {
+              "value": ""
+            }
+          ],
+          "externalInputs": [],
+          "internalOutputs": [],
+          "externalOutputs": []
+        }
+      ]
+    },
+    "expectedStatusCode": 500,
+    "expectedResponse": {
+      "description": "Unable to cast object of type 'System.String' to type 'System.Nullable`1[System.Int64]'."
+    }
   }
 ]
diff --git a/WalletWasabi.WabiSabiClientLibrary/Controllers/Controller.cs b/WalletWasabi.WabiSabiClientLibrary/Controllers/Controller.cs
index c27af847b69..bb861744a93 100644
--- a/WalletWasabi.WabiSabiClientLibrary/Controllers/Controller.cs
+++ b/WalletWasabi.WabiSabiClientLibrary/Controllers/Controller.cs
@@ -9,6 +9,7 @@ namespace WalletWasabi.WabiSabiClientLibrary.Controllers;
 
 [ApiController]
 [ExceptionTranslateFilter]
+[ValidationFilter]
 [Produces("application/json")]
 public class Controller : ControllerBase, IDisposable
 {
diff --git a/WalletWasabi.WabiSabiClientLibrary/Filters/ValidationFilter.cs b/WalletWasabi.WabiSabiClientLibrary/Filters/ValidationFilter.cs
new file mode 100644
index 00000000000..dce4afb17ca
--- /dev/null
+++ b/WalletWasabi.WabiSabiClientLibrary/Filters/ValidationFilter.cs
@@ -0,0 +1,19 @@
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Mvc.Filters;
+
+namespace WalletWasabi.WabiSabiClientLibrary.Filters;
+
+public class ValidationFilterAttribute : Attribute, IAsyncActionFilter
+{
+	public async Task OnActionExecutionAsync(ActionExecutingContext context, ActionExecutionDelegate next)
+	{
+		if (!context.ModelState.IsValid)
+		{
+			string messages = string.Join("; ", context.ModelState.Values.SelectMany(x => x.Errors).Select(x => x.ErrorMessage));
+			throw new Exception(messages);
+		}
+
+		await next();
+	}
+}
diff --git a/WalletWasabi.WabiSabiClientLibrary/Program.cs b/WalletWasabi.WabiSabiClientLibrary/Program.cs
index 4a2c403cd7b..cb3067604b7 100644
--- a/WalletWasabi.WabiSabiClientLibrary/Program.cs
+++ b/WalletWasabi.WabiSabiClientLibrary/Program.cs
@@ -40,6 +40,9 @@ public static async Task Main(string[] args)
 			builder.Services.AddControllers().AddNewtonsoftJson(x =>
 			{
 				x.SerializerSettings.Converters = JsonSerializationOptions.Default.Settings.Converters;
+			}).ConfigureApiBehaviorOptions(options =>
+			{
+				options.SuppressModelStateInvalidFilter = true;
 			});
 			builder.Services.AddSingleton<Global>(global);
 #if (DEBUG)