diff --git a/Constants/XApiKeyScope.cs b/Constants/XApiKeyScope.cs
new file mode 100644
index 0000000..d6d5cc0
--- /dev/null
+++ b/Constants/XApiKeyScope.cs
@@ -0,0 +1,19 @@
+using xExceptions.Attributes;
+
+namespace xIdentityModels.Constants
+{
+    public enum XApiKeyScope
+    {
+        [StringValue("read")]
+        Read,
+
+        [StringValue("write")]
+        Write,
+
+        [StringValue("admin")]
+        Admin,
+
+        [StringValue("manage")]
+        Manage
+    }
+}
\ No newline at end of file
diff --git a/Constants/XApplicationType.cs b/Constants/XApplicationType.cs
new file mode 100644
index 0000000..65db979
--- /dev/null
+++ b/Constants/XApplicationType.cs
@@ -0,0 +1,7 @@
+namespace xIdentityModels.Constants
+{
+    public enum XApplicationType
+    {
+        Web, Mobile, Desktop, IoT, ThirdParty, Service
+    }
+}
\ No newline at end of file
diff --git a/Extensions/xIdentityModelsExtensions.cs b/Extensions/xIdentityModelsExtensions.cs
index 6daae10..4efbc11 100644
--- a/Extensions/xIdentityModelsExtensions.cs
+++ b/Extensions/xIdentityModelsExtensions.cs
@@ -5,6 +5,8 @@ using xIdentityModels.Models;
 using xIdentityModels.Constants;
 using System.Collections.Generic;
 using xIdentityModels.Configurations;
+using Microsoft.OpenApi.Expressions;
+using System;
 
 namespace xIdentityModels.Extensions
 {
@@ -161,7 +163,7 @@ namespace xIdentityModels.Extensions
         )
         {
             //
-            var result = 
+            var result =
                 !source.IsNullOrDefault() &&
                 source.Roles
                     .Any(r => roles
@@ -195,5 +197,54 @@ namespace xIdentityModels.Extensions
             //
             return result;
         }
+
+        /// <summary>
+        /// Check Specified Api Key is Revoked or not ...
+        /// </summary>
+        /// <param name="source"></param>
+        /// <returns></returns>
+        public static bool IsRevoked(this XApiKey source)
+        {
+            //
+            var result = 
+                !source.IsNullOrDefault() &&
+                source.RevokedAt.HasValue;
+
+            //
+            return result;
+        }
+
+        /// <summary>
+        /// Check Specified Api Key is Expired or not ...
+        /// </summary>
+        /// <param name="source"></param>
+        /// <returns></returns>
+        public static bool IsExpired(this XApiKey source)
+        {
+            //
+            var result =
+                !source.IsNullOrDefault() &&
+                DateTime.UtcNow >= source.ExpiresAt;
+
+            //
+            return result;
+        }
+
+        /// <summary>
+        /// Check Specified Api Key is Active or not ...
+        /// </summary>
+        /// <param name="source"></param>
+        /// <returns></returns>
+        public static bool IsActive(this XApiKey source)
+        {
+            //
+            var result =
+                !source.IsNullOrDefault() &&
+                !source.IsRevoked() &&
+                !source.IsExpired();
+
+            //
+            return result;
+        }
     }
 }
\ No newline at end of file
diff --git a/Models/XApiKey.cs b/Models/XApiKey.cs
new file mode 100644
index 0000000..8b8ec5e
--- /dev/null
+++ b/Models/XApiKey.cs
@@ -0,0 +1,84 @@
+using System;
+using xModels.Base;
+using System.ComponentModel.DataAnnotations;
+
+namespace xIdentityModels.Models
+{
+    /// <summary>
+    /// an Specified Api Key ...
+    /// </summary>
+    public class XApiKey : XBaseGuidIDEntity
+    {
+        /// <summary>
+        /// Related Application Id ...
+        /// </summary>
+        [Required]
+        public int ApplicationId { get; set; }
+
+        /// <summary>
+        /// Hash ...
+        /// SHA256 of ApiKey ...
+        /// </summary>
+        [Required]
+        [StringLength(512)]
+        public string KeyHash { get; set; }
+
+        /// <summary>
+        /// a Prefix ...
+        /// </summary>
+        [StringLength(100)]
+        public string KeyPrefix { get; set; }
+
+        /// <summary>
+        /// Expiration Type ...
+        /// </summary>
+        [Required]
+        public DateTime ExpiresAt { get; set; }
+
+        /// <summary>
+        /// Cration Time ...
+        /// </summary>
+        public DateTime CreatedOn { get; set; }
+
+        /// <summary>
+        /// Last Usage Date ...
+        /// </summary>
+        public DateTime? LastUsedAt { get; set; }
+
+        /// <summary>
+        /// Revoked Time ...
+        /// </summary>
+        public DateTime? RevokedAt { get; set; }
+
+        /// <summary>
+        /// Revoker User Id ...
+        /// </summary>
+        public string RevokedBy { get; set; }
+
+        /// <summary>
+        /// a Json Array String ...
+        /// XApiKeyScope ...
+        /// </summary>
+        [StringLength(1000)]
+        public string AllowedScopes { get; set; }
+
+        /// <summary>
+        /// a Comma-separated List which Specified White List IP ...
+        /// </summary>
+        [StringLength(2000)]
+        public string AllowedIPs { get; set; }
+
+        /// <summary>
+        /// Rate Limit Per Minute ...
+        /// </summary>
+        public int RateLimitPerMinute { get; set; } = 60;
+
+        // 
+        #region Navigation ...
+        /// <summary>
+        /// Related Application ...
+        /// </summary>
+        public virtual XApplication Application { get; set; }
+        #endregion
+    }
+}
\ No newline at end of file
diff --git a/Models/XApiKeyUsage.cs b/Models/XApiKeyUsage.cs
new file mode 100644
index 0000000..ab2cb47
--- /dev/null
+++ b/Models/XApiKeyUsage.cs
@@ -0,0 +1,43 @@
+using System;
+using xModels.Base;
+
+namespace xIdentityModels.Models
+{
+    public class XApiKeyUsage : XBaseLongIDEntity
+    {
+        /// <summary>
+        /// Api Key Id ...
+        /// </summary>
+        public Guid ApiKeyId { get; set; }
+
+        /// <summary>
+        /// Called Endpoint ...
+        /// </summary>
+        public string Endpoint { get; set; }
+
+        /// <summary>
+        /// Called Http Method ...
+        /// </summary>
+        public string HttpMethod { get; set; }
+
+        /// <summary>
+        /// Client IP Address ...
+        /// </summary>
+        public string ClientIP { get; set; }
+
+        /// <summary>
+        /// Status Code ...
+        /// </summary>
+        public int StatusCode { get; set; }
+
+        /// <summary>
+        /// Request Time ...
+        /// </summary>
+        public DateTime RequestedOn { get; set; }
+
+        /// <summary>
+        /// Response Time in Milliseconds ...
+        /// </summary>
+        public long ResponseTimeMs { get; set; }
+    }
+}
\ No newline at end of file
diff --git a/Models/XApplication.cs b/Models/XApplication.cs
new file mode 100644
index 0000000..7d89082
--- /dev/null
+++ b/Models/XApplication.cs
@@ -0,0 +1,62 @@
+using System;
+using xModels.Base;
+using xIdentityModels.Constants;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+
+namespace xIdentityModels.Models
+{
+    /// <summary>
+    /// an Application in xDashboard ...
+    /// </summary>
+    public class XApplication : XBaseIntIDEntity
+    {
+        /// <summary>
+        /// Name ...
+        /// </summary>
+        [Required]
+        [StringLength(255)]
+        public string Name { get; set; }
+
+        /// <summary>
+        /// Descriptor ...
+        /// </summary>
+        [StringLength(1000)]
+        public string Description { get; set; }
+
+        /// <summary>
+        /// Owner Id ...
+        /// </summary>
+        [Required]
+        [StringLength(255)]
+        public string OwnerId { get; set; }
+
+        /// <summary>
+        /// Application Type ...
+        /// </summary>
+        public XApplicationType Type { get; set; }
+
+        /// <summary>
+        /// Specified Application is Active or not ...
+        /// </summary>
+        public bool IsActive { get; set; } = true;
+
+        /// <summary>
+        /// Application Create Time ...
+        /// </summary>
+        public DateTime CreatedOn { get; set; }
+
+        /// <summary>
+        /// Application Update Type ...
+        /// </summary>
+        public DateTime UpdatedAt { get; set; }
+
+        // 
+        #region Navigation ...
+        /// <summary>
+        /// a Collection of ApiKeys which Related to this Application ...
+        /// </summary>
+        public virtual ICollection<XApiKey> ApiKeys { get; set; }
+        #endregion
+    }
+}
\ No newline at end of file