diff --git a/Mimir/Controllers/AvatarController.cs b/Mimir/Controllers/AvatarController.cs
index 07addee0..54579eb8 100644
--- a/Mimir/Controllers/AvatarController.cs
+++ b/Mimir/Controllers/AvatarController.cs
@@ -1,6 +1,15 @@
+using System.Numerics;
+using Bencodex;
+using Libplanet.Common;
+using Libplanet.Crypto;
 using Microsoft.AspNetCore.Mvc;
 using Mimir.Models.Avatar;
 using Mimir.Repositories;
+using Mimir.Services;
+using Mimir.Util;
+using Nekoyume.Model.State;
+using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
 
 namespace Mimir.Controllers;
 
@@ -8,16 +17,107 @@ namespace Mimir.Controllers;
 [Route("{network}/avatars")]
 public class AvatarController(AvatarRepository avatarRepository) : ControllerBase
 {
+    #region temporary snippets
+
+    // This is a snippet from Mimir/Util/BigIntegerToStringConverter.cs
+    private class BigIntegerToStringConverter : JsonConverter
+    {
+        public override bool CanConvert(Type objectType)
+        {
+            return objectType == typeof(BigInteger);
+        }
+
+        public override object ReadJson(JsonReader reader, Type objectType, object? existingValue,
+            JsonSerializer serializer)
+        {
+            throw new NotImplementedException();
+        }
+
+        public override void WriteJson(JsonWriter writer, object? value, JsonSerializer serializer)
+        {
+            writer.WriteValue(value?.ToString());
+        }
+    }
+
+    // This is a snippet from Mimir/Util/StateJsonConverter.cs
+    private class StateJsonConverter : JsonConverter
+    {
+        public override bool CanConvert(Type objectType)
+        {
+            return typeof(IState).IsAssignableFrom(objectType);
+        }
+
+        public override object ReadJson(
+            JsonReader reader,
+            Type objectType,
+            object? existingValue,
+            JsonSerializer serializer)
+        {
+            throw new NotImplementedException();
+        }
+
+        public override void WriteJson(JsonWriter writer, object? value, JsonSerializer serializer)
+        {
+            if (value is null)
+            {
+                return;
+            }
+
+            var jo = JObject.FromObject(value, JsonSerializer.CreateDefault(new JsonSerializerSettings
+            {
+                ReferenceLoopHandling = ReferenceLoopHandling.Ignore,
+                Converters = new List<JsonConverter> { new BigIntegerToStringConverter() },
+                Formatting = Formatting.Indented,
+                NullValueHandling = NullValueHandling.Ignore
+            }));
+
+            var iValue = value switch
+            {
+                AvatarState avatarState => avatarState.SerializeList(),
+                IState state => state.Serialize(),
+                _ => null
+            };
+
+            if (iValue != null)
+            {
+                var rawValue = ByteUtil.Hex(new Codec().Encode(iValue));
+                jo.Add("Raw", rawValue);
+            }
+
+            jo.WriteTo(writer);
+        }
+    }
+
+    // This is a snippet from Mimir.Worker/Models/State/BaseData.cs
+    private static JsonSerializerSettings JsonSerializerSettings => new()
+    {
+        Converters = { new StateJsonConverter() },
+        Formatting = Formatting.Indented,
+        NullValueHandling = NullValueHandling.Ignore
+    };
+
+    #endregion snippets
+
     [HttpGet("{avatarAddress}/inventory")]
-    public Inventory? GetInventory(string network, string avatarAddress)
+    public async Task<Inventory?> GetInventory(
+        string network,
+        string avatarAddress,
+        IStateService stateService)
     {
         var inventory = avatarRepository.GetInventory(network, avatarAddress);
-        if (inventory is null)
+        if (inventory is not null)
+        {
+            return inventory;
+        }
+
+        var stateGetter = new StateGetter(stateService);
+        var inventoryState = await stateGetter.GetInventoryStateAsync(new Address(avatarAddress));
+        if (inventoryState is null)
         {
             Response.StatusCode = StatusCodes.Status404NotFound;
             return null;
         }
 
-        return inventory;
+        return new Inventory(inventoryState);
     }
 }
diff --git a/Mimir/Models/Avatar/Inventory.cs b/Mimir/Models/Avatar/Inventory.cs
index 64d29820..e7e48538 100644
--- a/Mimir/Models/Avatar/Inventory.cs
+++ b/Mimir/Models/Avatar/Inventory.cs
@@ -3,9 +3,21 @@
 
 namespace Mimir.Models.Avatar;
 
-public class Inventory(BsonValue inventory)
+public class Inventory
 {
-    public List<Equipment> Equipments { get; set; } = inventory["Equipments"].AsBsonArray
-        .Select(e => new Equipment(e.AsBsonDocument))
-        .ToList();
+    public List<Equipment> Equipments { get; set; }
+
+    public Inventory(Nekoyume.Model.Item.Inventory inventory)
+    {
+        Equipments = inventory.Equipments
+            .Select(e => new Equipment(e))
+            .ToList();
+    }
+    
+    public Inventory(BsonValue inventory)
+    {
+        Equipments = inventory["Equipments"].AsBsonArray
+            .Select(e => new Equipment(e.AsBsonDocument))
+            .ToList();
+    }
 }
diff --git a/Mimir/Models/Items/Equipment.cs b/Mimir/Models/Items/Equipment.cs
index 599ab3aa..7ec1d86a 100644
--- a/Mimir/Models/Items/Equipment.cs
+++ b/Mimir/Models/Items/Equipment.cs
@@ -2,7 +2,17 @@
 
 namespace Mimir.Models.Items;
 
-public class Equipment(BsonValue equipment) : NonFungibleItem(equipment)
+public class Equipment : NonFungibleItem
 {
-    public int Level { get; set; } = equipment["level"].AsInt32;
+    public int Level { get; set; }
+
+    public Equipment(Nekoyume.Model.Item.Equipment equipment) : base(equipment)
+    {
+        Level = equipment.level;
+    }
+
+    public Equipment(BsonValue equipment) : base(equipment)
+    {
+        Level = equipment["level"].AsInt32;
+    }
 }
diff --git a/Mimir/Models/Items/Item.cs b/Mimir/Models/Items/Item.cs
index 98145e5e..764706dc 100644
--- a/Mimir/Models/Items/Item.cs
+++ b/Mimir/Models/Items/Item.cs
@@ -3,7 +3,17 @@
 
 namespace Mimir.Models.Items;
 
-public class Item(BsonValue item)
+public class Item
 {
-    public ItemSubType ItemSubType { get; set; } = (ItemSubType)item["ItemSubType"].AsInt32;
+    public ItemSubType ItemSubType { get; set; }
+
+    public Item(IItem item)
+    {
+        ItemSubType = item.ItemSubType;
+    }
+
+    public Item(BsonValue item)
+    {
+        ItemSubType = (ItemSubType)item["ItemSubType"].AsInt32;
+    }
 }
diff --git a/Mimir/Models/Items/NonFungibleItem.cs b/Mimir/Models/Items/NonFungibleItem.cs
index 335653fa..49a1cb54 100644
--- a/Mimir/Models/Items/NonFungibleItem.cs
+++ b/Mimir/Models/Items/NonFungibleItem.cs
@@ -1,11 +1,21 @@
 using MongoDB.Bson;
+using Nekoyume.Model.Item;
 
 namespace Mimir.Models.Items;
 
-public class NonFungibleItem(BsonValue nonFungibleItem) : Item(nonFungibleItem)
+public class NonFungibleItem : Item
 {
-    public Guid NonFungibleId { get; set; } =
-        Guid.TryParse(nonFungibleItem["NonFungibleId"].AsString, out var nonFungibleId)
+    public Guid NonFungibleId { get; set; }
+
+    public NonFungibleItem(INonFungibleItem nonFungibleItem) : base(nonFungibleItem)
+    {
+        NonFungibleId = nonFungibleItem.NonFungibleId;
+    }
+
+    public NonFungibleItem(BsonValue nonFungibleItem) : base(nonFungibleItem)
+    {
+        NonFungibleId = Guid.TryParse(nonFungibleItem["NonFungibleId"].AsString, out var nonFungibleId)
             ? nonFungibleId
             : Guid.Empty;
+    }
 }