diff --git a/src/Infrastructure/BotSharp.Abstraction/Users/IUserService.cs b/src/Infrastructure/BotSharp.Abstraction/Users/IUserService.cs
index 8f314ffa..4071790c 100644
--- a/src/Infrastructure/BotSharp.Abstraction/Users/IUserService.cs
+++ b/src/Infrastructure/BotSharp.Abstraction/Users/IUserService.cs
@@ -10,4 +10,6 @@ public interface IUserService
     Task<Token> ActiveUser(UserActivationModel model);
     Task<Token?> GetToken(string authorization);
     Task<User> GetMyProfile();
+    Task<bool> VerifyUserUnique(string userName);
+    Task<bool> VerifyEmailUnique(string email);
 }
\ No newline at end of file
diff --git a/src/Infrastructure/BotSharp.Abstraction/Utilities/Pagination.cs b/src/Infrastructure/BotSharp.Abstraction/Utilities/Pagination.cs
index 92e3eacb..512d27c4 100644
--- a/src/Infrastructure/BotSharp.Abstraction/Utilities/Pagination.cs
+++ b/src/Infrastructure/BotSharp.Abstraction/Utilities/Pagination.cs
@@ -13,17 +13,14 @@ public class Pagination
 
     public int Size
     {
-        get 
+        get
         {
-            if (_size <= 0) return 20;
-            if (_size > 100) return 100;
-
             return _size;
-        } 
-        set 
+        }
+        set
         {
             _size = value;
-        } 
+        }
     }
 
     /// <summary>
diff --git a/src/Infrastructure/BotSharp.Core/Users/Services/UserService.cs b/src/Infrastructure/BotSharp.Core/Users/Services/UserService.cs
index ae5220b9..19242e39 100644
--- a/src/Infrastructure/BotSharp.Core/Users/Services/UserService.cs
+++ b/src/Infrastructure/BotSharp.Core/Users/Services/UserService.cs
@@ -263,4 +263,30 @@ public class UserService : IUserService
         };
         return token;
     }
+
+    public async Task<bool> VerifyUserUnique(string userName)
+    {
+        if (string.IsNullOrEmpty(userName))
+            return false;
+
+        var db = _services.GetRequiredService<IBotSharpRepository>();
+        var user = db.GetUserByUserName(userName);
+        if (user == null)
+            return true;
+        
+        return false;
+    }
+
+    public async Task<bool> VerifyEmailUnique(string email)
+    {
+        if (string.IsNullOrEmpty(email))
+            return false;
+
+        var db = _services.GetRequiredService<IBotSharpRepository>();
+        var emailName = db.GetUserByEmail(email);
+        if (emailName == null)
+            return true;
+
+        return false;
+    }
 }
diff --git a/src/Infrastructure/BotSharp.OpenAPI/Controllers/UserController.cs b/src/Infrastructure/BotSharp.OpenAPI/Controllers/UserController.cs
index 317d1fc9..e413724b 100644
--- a/src/Infrastructure/BotSharp.OpenAPI/Controllers/UserController.cs
+++ b/src/Infrastructure/BotSharp.OpenAPI/Controllers/UserController.cs
@@ -94,4 +94,16 @@ public class UserController : ControllerBase
         }
         return UserViewModel.FromUser(user);
     }
+
+    [HttpGet("/user/name/existing")]
+    public async Task<bool> VerifyUserUnique([FromQuery] string userName)
+    {
+        return await _userService.VerifyUserUnique(userName);
+    }
+
+    [HttpGet("/user/email/existing")]
+    public async Task<bool> VerifyEmailUnique([FromQuery] string email)
+    {
+        return await _userService.VerifyEmailUnique(email);
+    }
 }