diff --git a/NineChronicles.Headless.AccessControlCenter/Controllers/AccessControlServiceController.cs b/NineChronicles.Headless.AccessControlCenter/Controllers/AccessControlServiceController.cs
index 2e9658ecb..4888a6458 100644
--- a/NineChronicles.Headless.AccessControlCenter/Controllers/AccessControlServiceController.cs
+++ b/NineChronicles.Headless.AccessControlCenter/Controllers/AccessControlServiceController.cs
@@ -27,7 +27,7 @@ public AccessControlServiceController(IMutableAccessControlService accessControl
         [HttpGet("entries/{address}")]
         public ActionResult<int?> GetTxQuota(string address)
         {
-            var result = _accessControlService.GetTxQuota(new Address(address));
+            var result = _accessControlService.GetTxQuotaAsync(new Address(address)).Result;
 
             return result != null ? result : NotFound();
         }
diff --git a/NineChronicles.Headless/Services/RedisAccessControlService.cs b/NineChronicles.Headless/Services/RedisAccessControlService.cs
index 4dce4a4f3..78a3aec7c 100644
--- a/NineChronicles.Headless/Services/RedisAccessControlService.cs
+++ b/NineChronicles.Headless/Services/RedisAccessControlService.cs
@@ -1,4 +1,5 @@
 using System;
+using System.Threading.Tasks;
 using StackExchange.Redis;
 using Libplanet.Crypto;
 using Nekoyume.Blockchain;
@@ -23,18 +24,17 @@ public RedisAccessControlService(string storageUri)
             _db = redis.GetDatabase();
         }
 
-        public int? GetTxQuota(Address address)
+        public async Task<int?> GetTxQuotaAsync(Address address)
         {
             try
             {
-                RedisValue result = _db.StringGet(address.ToString());
-
+                RedisValue result = await _db.StringGetAsync(address.ToString());
                 return !result.IsNull ? Convert.ToInt32(result) : null;
             }
-            catch (RedisTimeoutException)
+            catch (RedisTimeoutException ex)
             {
                 Log.ForContext("Source", nameof(IAccessControlService))
-                    .Error("\"{Address}\" Redis timeout.", address);
+                    .Error(ex, "\"{Address}\" Redis timeout encountered.", address);
                 return null;
             }
         }
diff --git a/NineChronicles.Headless/Services/RestAPIAccessControlService.cs b/NineChronicles.Headless/Services/RestAPIAccessControlService.cs
index 733159334..73c39d306 100644
--- a/NineChronicles.Headless/Services/RestAPIAccessControlService.cs
+++ b/NineChronicles.Headless/Services/RestAPIAccessControlService.cs
@@ -21,7 +21,7 @@ public RestAPIAccessControlService(string baseUrl)
             };
         }
 
-        public int? GetTxQuota(Address address)
+        public Task<int?> GetTxQuotaAsync(Address address)
         {
             try
             {
@@ -31,7 +31,7 @@ public RestAPIAccessControlService(string baseUrl)
                 if (response.IsSuccessStatusCode)
                 {
                     string resultString = response.Content.ReadAsStringAsync().GetAwaiter().GetResult();
-                    return Convert.ToInt32(resultString);
+                    return Task.FromResult<int?>(Convert.ToInt32(resultString));
                 }
             }
             catch (TaskCanceledException)
@@ -45,7 +45,7 @@ public RestAPIAccessControlService(string baseUrl)
                     .Error(ex, "HttpRequestException occurred for \"{Address}\".", address);
             }
 
-            return null;
+            return Task.FromResult<int?>(null);
         }
     }
 }
diff --git a/NineChronicles.Headless/Services/SQLiteAccessControlService.cs b/NineChronicles.Headless/Services/SQLiteAccessControlService.cs
index 1ddfaac65..1d370432d 100644
--- a/NineChronicles.Headless/Services/SQLiteAccessControlService.cs
+++ b/NineChronicles.Headless/Services/SQLiteAccessControlService.cs
@@ -1,4 +1,5 @@
 using System;
+using System.Threading.Tasks;
 using Microsoft.Data.Sqlite;
 using Libplanet.Crypto;
 using Nekoyume.Blockchain;
@@ -34,7 +35,7 @@ public SQLiteAccessControlService(string connectionString)
             }
         }
 
-        public int? GetTxQuota(Address address)
+        public Task<int?> GetTxQuotaAsync(Address address)
         {
             try
             {
@@ -49,7 +50,7 @@ public SQLiteAccessControlService(string connectionString)
 
                 if (queryResult != null && queryResult != DBNull.Value)
                 {
-                    return Convert.ToInt32(queryResult);
+                    return Task.FromResult<int?>(Convert.ToInt32(queryResult));
                 }
             }
             catch (Exception ex)
@@ -57,7 +58,7 @@ public SQLiteAccessControlService(string connectionString)
                 Log.Error(ex, "An error occurred while getting transaction quota.");
             }
 
-            return null;
+            return Task.FromResult<int?>(null);
         }
 
         private void ExecuteNonQuery(SqliteConnection connection, string commandText)