diff --git a/CHANGES.md b/CHANGES.md
index bd97294d2a5..d473bc3cf8f 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -13,9 +13,12 @@ To be released.
     `ObjectGraphType<IValue>` instead of `StringGraphType`.  Instead of
     simply being a hexadecimal representation of `byte[]` encoded `IValue`,
     now one can choose its representation format.  [[#3560]]
+ -  (Libplanet.Explorer) Added `HelperQuery`, a collection of utility like
+    queries.  [[#3561]]
 
 [#3559]: https://github.com/planetarium/libplanet/pull/3559
 [#3560]: https://github.com/planetarium/libplanet/pull/3560
+[#3561]: https://github.com/planetarium/libplanet/pull/3561
 
 
 Version 3.9.2
diff --git a/Libplanet.Explorer.Tests/Queries/HelperQueryTest.cs b/Libplanet.Explorer.Tests/Queries/HelperQueryTest.cs
new file mode 100644
index 00000000000..8ef1be73ef2
--- /dev/null
+++ b/Libplanet.Explorer.Tests/Queries/HelperQueryTest.cs
@@ -0,0 +1,63 @@
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using GraphQL;
+using GraphQL.Execution;
+using Libplanet.Common;
+using static Libplanet.Explorer.Tests.GraphQLTestUtils;
+using Libplanet.Explorer.Queries;
+using Libplanet.Types.Assets;
+using Xunit;
+
+namespace Libplanet.Explorer.Tests.Queries;
+
+public class HelperQueryTest
+{
+    [Fact]
+    public async Task CurrencyHash()
+    {
+        Currency currency = Currency.Uncapped("ABC", 2, minters: null);
+
+        ExecutionResult result = await ExecuteQueryAsync<HelperQuery>(@"
+        {
+            currencyHash (
+                currency: { ticker: ""ABC"", decimalPlaces: 2, totalSupplyTrackable: true }
+            )
+        }
+        ");
+
+        Assert.Null(result.Errors);
+        ExecutionNode resultData = Assert.IsAssignableFrom<ExecutionNode>(result.Data);
+        IDictionary<string, object> resultDict =
+            Assert.IsAssignableFrom<IDictionary<string, object>>(resultData!.ToValue());
+        string hash =
+            Assert.IsAssignableFrom<string>(resultDict["currencyHash"]);
+        Assert.Equal(ByteUtil.Hex(currency.Hash.ByteArray), hash);
+    }
+
+    [Fact]
+    public async Task BencodexValue()
+    {
+        ExecutionResult result = await ExecuteQueryAsync<HelperQuery>(@"
+        {
+            bencodexValue (hex: ""7531323a68656c6c6f20776f726c6421"") {
+                hex
+                json
+                inspection
+            }
+        }
+        ");
+
+        Assert.Null(result.Errors);
+        ExecutionNode resultData = Assert.IsAssignableFrom<ExecutionNode>(result.Data);
+        IDictionary<string, object> resultDict =
+            Assert.IsAssignableFrom<IDictionary<string, object>>(resultData!.ToValue());
+        IDictionary<string, object> bencodexValue =
+            Assert.IsAssignableFrom<IDictionary<string, object>>(resultDict["bencodexValue"]);
+        string hex = Assert.IsAssignableFrom<string>(bencodexValue["hex"]);
+        string json = Assert.IsAssignableFrom<string>(bencodexValue["json"]);
+        string inspection = Assert.IsAssignableFrom<string>(bencodexValue["inspection"]);
+        Assert.Equal("7531323a68656c6c6f20776f726c6421", hex);
+        Assert.Equal("\"\\uFEFFhello world!\"", json);
+        Assert.Equal("\"hello world!\"", inspection);
+    }
+}
diff --git a/Libplanet.Explorer/Queries/ExplorerQuery.cs b/Libplanet.Explorer/Queries/ExplorerQuery.cs
index 5829a49ff88..bf210edcae7 100644
--- a/Libplanet.Explorer/Queries/ExplorerQuery.cs
+++ b/Libplanet.Explorer/Queries/ExplorerQuery.cs
@@ -28,6 +28,7 @@ public ExplorerQuery(IBlockChainContext chainContext)
                 "nodeState",
                 resolve: context => chainContext
             );
+            Field<HelperQuery>("helperQuery", resolve: context => new { });
 
             Name = "ExplorerQuery";
         }
diff --git a/Libplanet.Explorer/Queries/HelperQuery.cs b/Libplanet.Explorer/Queries/HelperQuery.cs
new file mode 100644
index 00000000000..49e6e5063ef
--- /dev/null
+++ b/Libplanet.Explorer/Queries/HelperQuery.cs
@@ -0,0 +1,48 @@
+using System.Security.Cryptography;
+using Bencodex;
+using GraphQL;
+using GraphQL.Types;
+using Libplanet.Common;
+using Libplanet.Explorer.GraphTypes;
+using Libplanet.Types.Assets;
+
+namespace Libplanet.Explorer.Queries
+{
+    public class HelperQuery : ObjectGraphType
+    {
+        private static Codec _codec = new Codec();
+
+        public HelperQuery()
+        {
+            Name = "HelperQuery";
+            Description = "A number of queries for convenience.";
+
+            Field<NonNullGraphType<HashDigestType<SHA1>>>(
+                name: "currencyHash",
+                description: "Converts currency info to currency hash.",
+                arguments: new QueryArguments(
+                    new QueryArgument<NonNullGraphType<CurrencyInputType>>
+                    {
+                        Name = "currency",
+                        Description = "The currency to convert.",
+                    }
+                ),
+                resolve: context => context.GetArgument<Currency>("currency").Hash
+            );
+
+            Field<NonNullGraphType<BencodexValueType>>(
+                name: "bencodexValue",
+                description: "Decodes hex encoded bencodex value",
+                arguments: new QueryArguments(
+                    new QueryArgument<NonNullGraphType<StringGraphType>>
+                    {
+                        Name = "hex",
+                        Description = "The byte array in hex representation to decode.",
+                    }
+                ),
+                resolve: context =>
+                    _codec.Decode(ByteUtil.ParseHex(context.GetArgument<string>("hex")))
+            );
+        }
+    }
+}