diff --git a/NineChronicles.Headless.Tests/GraphQLTestUtils.cs b/NineChronicles.Headless.Tests/GraphQLTestUtils.cs
index 7bf0cf4b2..636bd6987 100644
--- a/NineChronicles.Headless.Tests/GraphQLTestUtils.cs
+++ b/NineChronicles.Headless.Tests/GraphQLTestUtils.cs
@@ -4,6 +4,7 @@
 using GraphQL;
 using GraphQL.Types;
 using Microsoft.Extensions.DependencyInjection;
+using NCAction = Libplanet.Action.PolymorphicAction<Nekoyume.Action.ActionBase>;
 
 namespace NineChronicles.Headless.Tests
 {
@@ -23,6 +24,8 @@ public static Task<ExecutionResult> ExecuteQueryAsync<TObjectGraphType>(
                 services.AddSingleton(standaloneContext);
             }
 
+            services.AddLibplanetExplorer<NCAction>();
+
             var serviceProvider = services.BuildServiceProvider();
             return ExecuteQueryAsync<TObjectGraphType>(
                 serviceProvider,
diff --git a/NineChronicles.Headless.Tests/GraphTypes/GraphQLTestBase.cs b/NineChronicles.Headless.Tests/GraphTypes/GraphQLTestBase.cs
index 9cbfefd5b..be925801f 100644
--- a/NineChronicles.Headless.Tests/GraphTypes/GraphQLTestBase.cs
+++ b/NineChronicles.Headless.Tests/GraphTypes/GraphQLTestBase.cs
@@ -27,6 +27,7 @@
 using Microsoft.Extensions.DependencyInjection;
 using Nekoyume.Model.State;
 using Nekoyume.TableData;
+using NCAction = Libplanet.Action.PolymorphicAction<Nekoyume.Action.ActionBase>;
 
 namespace NineChronicles.Headless.Tests.GraphTypes
 {
@@ -96,6 +97,7 @@ public GraphQLTestBase(ITestOutputHelper output)
             services.AddSingleton(StandaloneContextFx);
             services.AddSingleton<IConfiguration>(configuration);
             services.AddGraphTypes();
+            services.AddLibplanetExplorer<NCAction>();
             services.AddSingleton<StateQuery>();
             ServiceProvider serviceProvider = services.BuildServiceProvider();
             Schema = new StandaloneSchema(serviceProvider);
diff --git a/NineChronicles.Headless.Tests/GraphTypes/StandaloneQueryTest.cs b/NineChronicles.Headless.Tests/GraphTypes/StandaloneQueryTest.cs
index 5b3ecd5e6..24b8c8924 100644
--- a/NineChronicles.Headless.Tests/GraphTypes/StandaloneQueryTest.cs
+++ b/NineChronicles.Headless.Tests/GraphTypes/StandaloneQueryTest.cs
@@ -536,7 +536,7 @@ public async Task GetTx()
                     timestamp
                     updatedAddresses
                     actions {{
-                        plainValue
+                        inspection
                     }}
                 }}
             }}";
@@ -576,7 +576,7 @@ public async Task GetTx()
             var plainValue = tx["actions"]
                 .As<List<object>>()
                 .First()
-                .As<Dictionary<string, object>>()["plainValue"];
+                .As<Dictionary<string, object>>()["inspection"];
             Assert.Equal(transaction.Actions.First().PlainValue.Inspection, plainValue);
         }
 
diff --git a/NineChronicles.Headless/BlockChainContext.cs b/NineChronicles.Headless/BlockChainContext.cs
new file mode 100644
index 000000000..5a3cedaf0
--- /dev/null
+++ b/NineChronicles.Headless/BlockChainContext.cs
@@ -0,0 +1,23 @@
+using Libplanet.Action;
+using Libplanet.Blockchain;
+using Libplanet.Explorer.Interfaces;
+using Libplanet.Store;
+using Nekoyume.Action;
+using NCAction = Libplanet.Action.PolymorphicAction<Nekoyume.Action.ActionBase>;
+
+namespace NineChronicles.Headless
+{
+    public class BlockChainContext : IBlockChainContext<NCAction>
+    {
+        private readonly StandaloneContext _standaloneContext;
+
+        public BlockChainContext(StandaloneContext standaloneContext)
+        {
+            _standaloneContext = standaloneContext;
+        }
+
+        public bool Preloaded => _standaloneContext.NodeStatus.PreloadEnded;
+        public BlockChain<PolymorphicAction<ActionBase>> BlockChain => _standaloneContext.BlockChain;
+        public IStore Store => _standaloneContext.Store;
+    }
+}
diff --git a/NineChronicles.Headless/GraphQLBuilderExtensions.cs b/NineChronicles.Headless/GraphQLBuilderExtensions.cs
new file mode 100644
index 000000000..07dce444c
--- /dev/null
+++ b/NineChronicles.Headless/GraphQLBuilderExtensions.cs
@@ -0,0 +1,16 @@
+using GraphQL.Server;
+using Libplanet.Action;
+
+namespace NineChronicles.Headless
+{
+    public static class GraphQLBuilderExtensions
+    {
+        public static IGraphQLBuilder AddLibplanetExplorer<T>(this IGraphQLBuilder builder)
+            where T : IAction, new()
+        {
+            builder.Services.AddLibplanetExplorer<T>();
+
+            return builder;
+        }
+    }
+}
diff --git a/NineChronicles.Headless/GraphQLService.cs b/NineChronicles.Headless/GraphQLService.cs
index 2d19c0f9e..832388a1f 100644
--- a/NineChronicles.Headless/GraphQLService.cs
+++ b/NineChronicles.Headless/GraphQLService.cs
@@ -1,3 +1,4 @@
+using System;
 using System.Collections.Generic;
 using GraphQL.Server;
 using Microsoft.AspNetCore.Builder;
@@ -9,6 +10,7 @@
 using NineChronicles.Headless.Middleware;
 using NineChronicles.Headless.Properties;
 using Serilog;
+using NCAction = Libplanet.Action.PolymorphicAction<Nekoyume.Action.ActionBase>;
 
 namespace NineChronicles.Headless
 {
@@ -91,15 +93,16 @@ public void ConfigureServices(IServiceCollection services)
                             options.EnableMetrics = true;
                             options.UnhandledExceptionDelegate = context =>
                             {
-                                Log.Error(
-                                    context.Exception,
-                                    context.ErrorMessage);
+                                Console.Error.WriteLine(context.Exception.ToString());
+                                Console.Error.WriteLine(context.ErrorMessage);
                             };
                         })
                     .AddSystemTextJson()
                     .AddWebSockets()
                     .AddDataLoader()
                     .AddGraphTypes(typeof(StandaloneSchema))
+                    .AddLibplanetExplorer<NCAction>()
+                    .AddUserContextBuilder<UserContextBuilder>()
                     .AddGraphQLAuthorization(
                         options => options.AddPolicy(
                             LocalPolicyKey,
diff --git a/NineChronicles.Headless/GraphQLServiceExtensions.cs b/NineChronicles.Headless/GraphQLServiceExtensions.cs
index 7b67e35d0..326135118 100644
--- a/NineChronicles.Headless/GraphQLServiceExtensions.cs
+++ b/NineChronicles.Headless/GraphQLServiceExtensions.cs
@@ -2,8 +2,13 @@
 using System.Linq;
 using System.Reflection;
 using GraphQL.Types;
+using Libplanet.Action;
+using Libplanet.Explorer.GraphTypes;
+using Libplanet.Explorer.Interfaces;
+using Libplanet.Explorer.Queries;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.DependencyInjection.Extensions;
+using NCAction = Libplanet.Action.PolymorphicAction<Nekoyume.Action.ActionBase>;
 
 namespace NineChronicles.Headless
 {
@@ -24,5 +29,37 @@ public static IServiceCollection AddGraphTypes(this IServiceCollection services)
 
             return services;
         }
+
+        public static IServiceCollection AddLibplanetScalarTypes(this IServiceCollection services)
+        {
+            services.TryAddSingleton<AddressType>();
+            services.TryAddSingleton<ByteStringType>();
+
+            return services;
+        }
+
+        public static IServiceCollection AddBlockChainContext(this IServiceCollection services)
+        {
+            services.TryAddSingleton<IBlockChainContext<NCAction>, BlockChainContext>();
+
+            return services;
+        }
+
+        public static IServiceCollection AddLibplanetExplorer<T>(this IServiceCollection services)
+            where T : IAction, new()
+        {
+            services.AddLibplanetScalarTypes();
+            services.AddBlockChainContext();
+
+            services.TryAddSingleton<ActionType<T>>();
+            services.TryAddSingleton<BlockType<T>>();
+            services.TryAddSingleton<TransactionType<T>>();
+            services.TryAddSingleton<NodeStateType<T>>();
+            services.TryAddSingleton<BlockQuery<T>>();
+            services.TryAddSingleton<TransactionQuery<T>>();
+            services.TryAddSingleton<Query<T>>();
+
+            return services;
+        }
     }
 }
diff --git a/NineChronicles.Headless/GraphTypes/ActionMutation.cs b/NineChronicles.Headless/GraphTypes/ActionMutation.cs
index 8ac09644f..853887260 100644
--- a/NineChronicles.Headless/GraphTypes/ActionMutation.cs
+++ b/NineChronicles.Headless/GraphTypes/ActionMutation.cs
@@ -11,6 +11,7 @@
 using Serilog;
 using System;
 using System.Collections.Generic;
+using Libplanet.Explorer.GraphTypes;
 using Libplanet.Tx;
 using NineChroniclesActionType = Libplanet.Action.PolymorphicAction<Nekoyume.Action.ActionBase>;
 
diff --git a/NineChronicles.Headless/GraphTypes/ActionType.cs b/NineChronicles.Headless/GraphTypes/ActionType.cs
deleted file mode 100644
index dc2fef868..000000000
--- a/NineChronicles.Headless/GraphTypes/ActionType.cs
+++ /dev/null
@@ -1,17 +0,0 @@
-using GraphQL.Types;
-using Libplanet.Action;
-
-namespace NineChronicles.Headless.GraphTypes
-{
-    public class ActionType<T> : ObjectGraphType<T> where T : IAction, new()
-    {
-        public ActionType()
-        {
-            Field<NonNullGraphType<StringGraphType>>(
-                nameof(IAction.PlainValue),
-                resolve: context => context.Source.PlainValue.Inspection
-            );
-            Name = "Action";
-        }
-    }
-}
diff --git a/NineChronicles.Headless/GraphTypes/AddressType.cs b/NineChronicles.Headless/GraphTypes/AddressType.cs
deleted file mode 100644
index 523615285..000000000
--- a/NineChronicles.Headless/GraphTypes/AddressType.cs
+++ /dev/null
@@ -1,56 +0,0 @@
-using System;
-using GraphQL.Language.AST;
-using GraphQL.Types;
-using Libplanet;
-
-namespace NineChronicles.Headless.GraphTypes
-{
-    // Copied from planetarium/libplanet-explorer:59a2d3045e99100fb33d79cc7d0ee6fdc09a1eb4
-    // https://git.io/JfXZA
-    public class AddressType : StringGraphType
-    {
-        public AddressType()
-        {
-            Name = "Address";
-        }
-
-        public override object Serialize(object value)
-        {
-            if (value is Address addr)
-            {
-                return addr.ToString();
-            }
-
-            return value;
-        }
-
-        public override object ParseValue(object value)
-        {
-            switch (value)
-            {
-                case null:
-                    return null;
-                case string hex:
-                    if (hex.Substring(0, 2).ToLower().Equals("0x"))
-                    {
-                        hex = hex.Substring(2);
-                    }
-
-                    return new Address(hex);
-                default:
-                    throw new ArgumentException(
-                        $"Expected a hexadecimal string but {value}", nameof(value));
-            }
-        }
-
-        public override object ParseLiteral(IValue value)
-        {
-            if (value is StringValue)
-            {
-                return ParseValue(value.Value);
-            }
-
-            return null;
-        }
-    }
-}
diff --git a/NineChronicles.Headless/GraphTypes/AppProtocolVersionType.cs b/NineChronicles.Headless/GraphTypes/AppProtocolVersionType.cs
index 6967e75ef..1346ea8a1 100644
--- a/NineChronicles.Headless/GraphTypes/AppProtocolVersionType.cs
+++ b/NineChronicles.Headless/GraphTypes/AppProtocolVersionType.cs
@@ -1,6 +1,7 @@
 using Bencodex;
 using Libplanet.Net;
 using GraphQL.Types;
+using Libplanet.Explorer.GraphTypes;
 
 namespace NineChronicles.Headless.GraphTypes
 {
diff --git a/NineChronicles.Headless/GraphTypes/BlockHeaderType.cs b/NineChronicles.Headless/GraphTypes/BlockHeaderType.cs
index 1d5b2a89c..bcb81c907 100644
--- a/NineChronicles.Headless/GraphTypes/BlockHeaderType.cs
+++ b/NineChronicles.Headless/GraphTypes/BlockHeaderType.cs
@@ -3,6 +3,7 @@
 using Libplanet;
 using Libplanet.Action;
 using Libplanet.Blocks;
+using Libplanet.Explorer.GraphTypes;
 
 namespace NineChronicles.Headless.GraphTypes
 {
diff --git a/NineChronicles.Headless/GraphTypes/ByteStringType.cs b/NineChronicles.Headless/GraphTypes/ByteStringType.cs
deleted file mode 100644
index 3cc32afe5..000000000
--- a/NineChronicles.Headless/GraphTypes/ByteStringType.cs
+++ /dev/null
@@ -1,53 +0,0 @@
-using System;
-using GraphQL.Language.AST;
-using GraphQL.Types;
-using Libplanet;
-using Serilog;
-
-namespace NineChronicles.Headless.GraphTypes
-{
-    // Copied from planetarium/libplanet-explorer:59a2d3045e99100fb33d79cc7d0ee6fdc09a1eb4
-    // https://git.io/JfXOt
-    public class ByteStringType : ScalarGraphType
-    {
-        public ByteStringType()
-        {
-            Name = "ByteString";
-        }
-
-        public override object Serialize(object value)
-        {
-            // FIXME: ScalarGraphType에 동작 원리에 대한 이해가 필요합니다.
-            // https://graphql-dotnet.github.io/docs/getting-started/custom-scalars/
-            return value switch
-            {
-                byte[] b => ByteUtil.Hex(b),
-                string s => s,
-                _ => null
-            };
-        }
-
-        public override object ParseValue(object value)
-        {
-            switch (value)
-            {
-                case null:
-                    return null;
-                case string hex:
-                    return ByteUtil.ParseHex(hex);
-                default:
-                    throw new ArgumentException("Expected a hexadecimal string.", nameof(value));
-            }
-        }
-
-        public override object ParseLiteral(IValue value)
-        {
-            if (value is StringValue)
-            {
-                return ParseValue(value.Value);
-            }
-
-            return null;
-        }
-    }
-}
diff --git a/NineChronicles.Headless/GraphTypes/KeyStoreMutation.cs b/NineChronicles.Headless/GraphTypes/KeyStoreMutation.cs
index fcdcb4313..30f870f79 100644
--- a/NineChronicles.Headless/GraphTypes/KeyStoreMutation.cs
+++ b/NineChronicles.Headless/GraphTypes/KeyStoreMutation.cs
@@ -4,6 +4,7 @@
 using GraphQL.Types;
 using Libplanet;
 using Libplanet.Crypto;
+using Libplanet.Explorer.GraphTypes;
 using Libplanet.KeyStore;
 
 namespace NineChronicles.Headless.GraphTypes
diff --git a/NineChronicles.Headless/GraphTypes/KeyStoreType.cs b/NineChronicles.Headless/GraphTypes/KeyStoreType.cs
index 7b9d5366a..32eb762a5 100644
--- a/NineChronicles.Headless/GraphTypes/KeyStoreType.cs
+++ b/NineChronicles.Headless/GraphTypes/KeyStoreType.cs
@@ -4,6 +4,7 @@
 using GraphQL.Types;
 using Libplanet;
 using Libplanet.Crypto;
+using Libplanet.Explorer.GraphTypes;
 using Libplanet.KeyStore;
 using Org.BouncyCastle.Security;
 
diff --git a/NineChronicles.Headless/GraphTypes/NodeStatus.cs b/NineChronicles.Headless/GraphTypes/NodeStatus.cs
index 30d2ad65d..37facbcd9 100644
--- a/NineChronicles.Headless/GraphTypes/NodeStatus.cs
+++ b/NineChronicles.Headless/GraphTypes/NodeStatus.cs
@@ -8,6 +8,7 @@
 using Libplanet.Action;
 using Libplanet.Blockchain;
 using Libplanet.Blocks;
+using Libplanet.Explorer.GraphTypes;
 using Libplanet.Store;
 using Libplanet.Tx;
 using NCAction = Libplanet.Action.PolymorphicAction<Nekoyume.Action.ActionBase>;
diff --git a/NineChronicles.Headless/GraphTypes/PrivateKeyType.cs b/NineChronicles.Headless/GraphTypes/PrivateKeyType.cs
index 9c1ac6ee3..e12ee6b1f 100644
--- a/NineChronicles.Headless/GraphTypes/PrivateKeyType.cs
+++ b/NineChronicles.Headless/GraphTypes/PrivateKeyType.cs
@@ -1,6 +1,7 @@
 using GraphQL.Types;
 using Libplanet;
 using Libplanet.Crypto;
+using Libplanet.Explorer.GraphTypes;
 
 namespace NineChronicles.Headless.GraphTypes
 {
diff --git a/NineChronicles.Headless/GraphTypes/ProtectedPrivateKeyType.cs b/NineChronicles.Headless/GraphTypes/ProtectedPrivateKeyType.cs
index 665291edc..0a737b040 100644
--- a/NineChronicles.Headless/GraphTypes/ProtectedPrivateKeyType.cs
+++ b/NineChronicles.Headless/GraphTypes/ProtectedPrivateKeyType.cs
@@ -1,4 +1,5 @@
 using GraphQL.Types;
+using Libplanet.Explorer.GraphTypes;
 using Libplanet.KeyStore;
 
 namespace NineChronicles.Headless.GraphTypes
diff --git a/NineChronicles.Headless/GraphTypes/PublicKeyType.cs b/NineChronicles.Headless/GraphTypes/PublicKeyType.cs
index 425176b84..120a8d07f 100644
--- a/NineChronicles.Headless/GraphTypes/PublicKeyType.cs
+++ b/NineChronicles.Headless/GraphTypes/PublicKeyType.cs
@@ -2,6 +2,7 @@
 using GraphQL.Types;
 using Libplanet;
 using Libplanet.Crypto;
+using Libplanet.Explorer.GraphTypes;
 
 namespace NineChronicles.Headless.GraphTypes
 {
diff --git a/NineChronicles.Headless/GraphTypes/StandaloneMutation.cs b/NineChronicles.Headless/GraphTypes/StandaloneMutation.cs
index 78101aa4f..10a72339a 100644
--- a/NineChronicles.Headless/GraphTypes/StandaloneMutation.cs
+++ b/NineChronicles.Headless/GraphTypes/StandaloneMutation.cs
@@ -12,6 +12,7 @@
 using Serilog;
 using System;
 using GraphQL.Server.Authorization.AspNetCore;
+using Libplanet.Explorer.GraphTypes;
 using Microsoft.Extensions.Configuration;
 using NCAction = Libplanet.Action.PolymorphicAction<Nekoyume.Action.ActionBase>;
 
diff --git a/NineChronicles.Headless/GraphTypes/StandaloneQuery.cs b/NineChronicles.Headless/GraphTypes/StandaloneQuery.cs
index 628572d30..8005e8c27 100644
--- a/NineChronicles.Headless/GraphTypes/StandaloneQuery.cs
+++ b/NineChronicles.Headless/GraphTypes/StandaloneQuery.cs
@@ -1,4 +1,5 @@
 #nullable enable
+using System;
 using System.Security.Cryptography;
 using Bencodex;
 using Bencodex.Types;
@@ -8,6 +9,9 @@
 using Libplanet.Action;
 using Libplanet.Assets;
 using Libplanet.Blockchain;
+using Libplanet.Explorer.GraphTypes;
+using Libplanet.Explorer.Interfaces;
+using Libplanet.Store;
 using Microsoft.Extensions.Configuration;
 using Libplanet.Tx;
 using Nekoyume.Action;
@@ -88,6 +92,11 @@ public StandaloneQuery(StandaloneContext standaloneContext, IConfiguration confi
                 }
             );
 
+            Field<NonNullGraphType<Libplanet.Explorer.Queries.Query<NCAction>>>(
+                name: "chainQuery",
+                resolve: context => new { }
+            );
+
             Field<NonNullGraphType<ValidationQuery>>(
                 name: "validation",
                 description: "The validation method provider for Libplanet types.",
diff --git a/NineChronicles.Headless/GraphTypes/StandaloneSubscription.cs b/NineChronicles.Headless/GraphTypes/StandaloneSubscription.cs
index 1ce7a1a4e..eaaf173cf 100644
--- a/NineChronicles.Headless/GraphTypes/StandaloneSubscription.cs
+++ b/NineChronicles.Headless/GraphTypes/StandaloneSubscription.cs
@@ -12,6 +12,7 @@
 using Lib9c.Renderer;
 using Libplanet;
 using Libplanet.Blockchain;
+using Libplanet.Explorer.GraphTypes;
 using Libplanet.Net;
 using Libplanet.Headless;
 using Nekoyume.Action;
diff --git a/NineChronicles.Headless/GraphTypes/StateQuery.cs b/NineChronicles.Headless/GraphTypes/StateQuery.cs
index 11ffb67a1..f29bc2d04 100644
--- a/NineChronicles.Headless/GraphTypes/StateQuery.cs
+++ b/NineChronicles.Headless/GraphTypes/StateQuery.cs
@@ -3,6 +3,7 @@
 using GraphQL.Types;
 using Libplanet;
 using Libplanet.Action;
+using Libplanet.Explorer.GraphTypes;
 using Nekoyume;
 using Nekoyume.Model.State;
 using NineChronicles.Headless.GraphTypes.States;
diff --git a/NineChronicles.Headless/GraphTypes/States/AgentStateType.cs b/NineChronicles.Headless/GraphTypes/States/AgentStateType.cs
index a480f81ac..1df678664 100644
--- a/NineChronicles.Headless/GraphTypes/States/AgentStateType.cs
+++ b/NineChronicles.Headless/GraphTypes/States/AgentStateType.cs
@@ -5,6 +5,7 @@
 using Libplanet.Action;
 using Libplanet.Assets;
 using Libplanet.Blockchain;
+using Libplanet.Explorer.GraphTypes;
 using Nekoyume.Action;
 using Nekoyume.Model.State;
 
diff --git a/NineChronicles.Headless/GraphTypes/States/ArenaInfoType.cs b/NineChronicles.Headless/GraphTypes/States/ArenaInfoType.cs
index 49678dde2..7fd9dcfb6 100644
--- a/NineChronicles.Headless/GraphTypes/States/ArenaInfoType.cs
+++ b/NineChronicles.Headless/GraphTypes/States/ArenaInfoType.cs
@@ -1,4 +1,5 @@
 using GraphQL.Types;
+using Libplanet.Explorer.GraphTypes;
 using Nekoyume.Model.State;
 
 namespace NineChronicles.Headless.GraphTypes.States
diff --git a/NineChronicles.Headless/GraphTypes/States/AvatarStateType.cs b/NineChronicles.Headless/GraphTypes/States/AvatarStateType.cs
index 32a3f7c67..9d7e2f41e 100644
--- a/NineChronicles.Headless/GraphTypes/States/AvatarStateType.cs
+++ b/NineChronicles.Headless/GraphTypes/States/AvatarStateType.cs
@@ -1,4 +1,5 @@
 using GraphQL.Types;
+using Libplanet.Explorer.GraphTypes;
 using Nekoyume.Model.State;
 using NineChronicles.Headless.GraphTypes.States.Models;
 using NineChronicles.Headless.GraphTypes.States.Models.World;
diff --git a/NineChronicles.Headless/GraphTypes/States/Models/Item/MaterialType.cs b/NineChronicles.Headless/GraphTypes/States/Models/Item/MaterialType.cs
index e3e958000..c197bb9eb 100644
--- a/NineChronicles.Headless/GraphTypes/States/Models/Item/MaterialType.cs
+++ b/NineChronicles.Headless/GraphTypes/States/Models/Item/MaterialType.cs
@@ -1,4 +1,5 @@
 using GraphQL.Types;
+using Libplanet.Explorer.GraphTypes;
 using Nekoyume.Model.Item;
 
 namespace NineChronicles.Headless.GraphTypes.States.Models.Item
diff --git a/NineChronicles.Headless/GraphTypes/States/Models/Item/ShopItemType.cs b/NineChronicles.Headless/GraphTypes/States/Models/Item/ShopItemType.cs
index 9273ccaf5..ca5f7fe35 100644
--- a/NineChronicles.Headless/GraphTypes/States/Models/Item/ShopItemType.cs
+++ b/NineChronicles.Headless/GraphTypes/States/Models/Item/ShopItemType.cs
@@ -1,4 +1,5 @@
 using GraphQL.Types;
+using Libplanet.Explorer.GraphTypes;
 using Nekoyume.Model.Item;
 
 namespace NineChronicles.Headless.GraphTypes.States.Models.Item
diff --git a/NineChronicles.Headless/GraphTypes/States/RankingInfoType.cs b/NineChronicles.Headless/GraphTypes/States/RankingInfoType.cs
index 8f46a3fc6..17a8269bf 100644
--- a/NineChronicles.Headless/GraphTypes/States/RankingInfoType.cs
+++ b/NineChronicles.Headless/GraphTypes/States/RankingInfoType.cs
@@ -1,4 +1,5 @@
 using GraphQL.Types;
+using Libplanet.Explorer.GraphTypes;
 using Nekoyume.Model.State;
 
 namespace NineChronicles.Headless.GraphTypes.States
diff --git a/NineChronicles.Headless/GraphTypes/States/RankingMapStateType.cs b/NineChronicles.Headless/GraphTypes/States/RankingMapStateType.cs
index d92b64398..219e6f139 100644
--- a/NineChronicles.Headless/GraphTypes/States/RankingMapStateType.cs
+++ b/NineChronicles.Headless/GraphTypes/States/RankingMapStateType.cs
@@ -1,4 +1,5 @@
 using GraphQL.Types;
+using Libplanet.Explorer.GraphTypes;
 using Nekoyume.Action;
 using Nekoyume.Model.State;
 
diff --git a/NineChronicles.Headless/GraphTypes/States/ShopStateType.cs b/NineChronicles.Headless/GraphTypes/States/ShopStateType.cs
index 83b84e459..74149bc19 100644
--- a/NineChronicles.Headless/GraphTypes/States/ShopStateType.cs
+++ b/NineChronicles.Headless/GraphTypes/States/ShopStateType.cs
@@ -2,6 +2,7 @@
 using System.Linq;
 using GraphQL;
 using GraphQL.Types;
+using Libplanet.Explorer.GraphTypes;
 using Nekoyume.Model.Item;
 using Nekoyume.Model.State;
 using NineChronicles.Headless.GraphTypes.States.Models.Item;
diff --git a/NineChronicles.Headless/GraphTypes/States/WeeklyArenaStateType.cs b/NineChronicles.Headless/GraphTypes/States/WeeklyArenaStateType.cs
index 81eb4325f..5c10ff290 100644
--- a/NineChronicles.Headless/GraphTypes/States/WeeklyArenaStateType.cs
+++ b/NineChronicles.Headless/GraphTypes/States/WeeklyArenaStateType.cs
@@ -1,4 +1,5 @@
 using GraphQL.Types;
+using Libplanet.Explorer.GraphTypes;
 using Nekoyume.Model.State;
 
 namespace NineChronicles.Headless.GraphTypes.States
diff --git a/NineChronicles.Headless/GraphTypes/TransactionType.cs b/NineChronicles.Headless/GraphTypes/TransactionType.cs
index 9d5df9589..e5ed5afbe 100644
--- a/NineChronicles.Headless/GraphTypes/TransactionType.cs
+++ b/NineChronicles.Headless/GraphTypes/TransactionType.cs
@@ -1,5 +1,6 @@
 using GraphQL.Types;
 using Libplanet.Action;
+using Libplanet.Explorer.GraphTypes;
 using Libplanet.Tx;
 
 namespace NineChronicles.Headless.GraphTypes
diff --git a/NineChronicles.Headless/GraphTypes/ValidationQuery.cs b/NineChronicles.Headless/GraphTypes/ValidationQuery.cs
index c3ff9be21..a951b3ff2 100644
--- a/NineChronicles.Headless/GraphTypes/ValidationQuery.cs
+++ b/NineChronicles.Headless/GraphTypes/ValidationQuery.cs
@@ -4,6 +4,7 @@
 using GraphQL;
 using GraphQL.Types;
 using Libplanet.Crypto;
+using Libplanet.Explorer.GraphTypes;
 using Serilog;
 
 namespace NineChronicles.Headless.GraphTypes
diff --git a/NineChronicles.Headless/NineChronicles.Headless.csproj b/NineChronicles.Headless/NineChronicles.Headless.csproj
index 5f5f05068..ee269c564 100644
--- a/NineChronicles.Headless/NineChronicles.Headless.csproj
+++ b/NineChronicles.Headless/NineChronicles.Headless.csproj
@@ -17,6 +17,7 @@
     <PackageReference Include="GraphQL.Server.Transports.WebSockets" Version="4.4.0" />
     <PackageReference Include="GraphQL.Server.Ui.Playground" Version="4.4.0" />
     <PackageReference Include="GraphQL.SystemTextJson" Version="3.2.0" />
+    <PackageReference Include="Libplanet.Explorer" Version="0.1.0-dev.20210225020553" />
     <PackageReference Include="MagicOnion" Version="3.0.9" />
     <PackageReference Include="MagicOnion.Hosting" Version="3.0.9" />
     <PackageReference Include="Newtonsoft.Json" Version="12.0.3" />
diff --git a/NineChronicles.Headless/UserContextBuilder.cs b/NineChronicles.Headless/UserContextBuilder.cs
new file mode 100644
index 000000000..3ade5a130
--- /dev/null
+++ b/NineChronicles.Headless/UserContextBuilder.cs
@@ -0,0 +1,27 @@
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using GraphQL.Server.Transports.AspNetCore;
+using Libplanet.Explorer.Interfaces;
+using Microsoft.AspNetCore.Http;
+using NCAction = Libplanet.Action.PolymorphicAction<Nekoyume.Action.ActionBase>;
+
+namespace NineChronicles.Headless
+{
+    public class UserContextBuilder : IUserContextBuilder
+    {
+        private readonly StandaloneContext _standaloneContext;
+
+        public UserContextBuilder(StandaloneContext standaloneContext)
+        {
+            _standaloneContext = standaloneContext;
+        }
+        
+        public Task<IDictionary<string, object>> BuildUserContext(HttpContext httpContext)
+        {
+            return new ValueTask<IDictionary<string, object>>(new Dictionary<string, object>
+            {
+                [nameof(IBlockChainContext<NCAction>.Store)] = _standaloneContext.Store,
+            }).AsTask();
+        }
+    }
+}