diff --git a/src/Std/Lib/Openprovider.php b/src/Std/Lib/Openprovider.php
index bd9c782..e616ac3 100644
--- a/src/Std/Lib/Openprovider.php
+++ b/src/Std/Lib/Openprovider.php
@@ -6,6 +6,7 @@ use Std\Lib\Curl;
 class Openprovider {
   protected string $dataDir = ROOT."/data/cache/";
   protected int $tokenDuration = 172800; // 48時間
+  protected int $dataDuration = 1800; // 30分
 
   private string $user = '';
   private string $pass = '';
@@ -93,7 +94,7 @@ class Openprovider {
   public function listDomains(array $query = []): \Result {
     if (!OPENPROVIDER_ENABLED) return \Result::error('エラー：OpenProviderは無効です。');
     $cache = $this->getCache('listdomains');
-    if (!empty($cache)) return \Result::Success('', $cache);
+    if ($this->isValidLifespan($cache, $query)) return \Result::Success('', $cache);
 
     $curl = $this->setupCurl('/domains');
     $res = $this->curlResult($curl);
@@ -206,8 +207,8 @@ class Openprovider {
    */
   public function listCustomers(array $query = []): \Result {
     if (!OPENPROVIDER_ENABLED) return \Result::error('エラー：OpenProviderは無効です。');
-    $cache = $this->getCache('listcustomer');
-    if (!empty($cache) && (isset($cache['query']) && $cache['query'] === $query)) return \Result::Success('', $cache);
+    $cache = $this->getCache('listcustomers');
+    if ($this->isValidLifespan($cache, $query)) return \Result::Success('', $cache);
 
     foreach ($query as $k => $v) { if (is_bool($v)) $query[$k] = $v ? '1' : '0'; }
     $uri = '/customers?'.http_build_query($query, '', '&', PHP_QUERY_RFC3986);
@@ -215,7 +216,7 @@ class Openprovider {
     $res = $this->curlResult($curl);
     if (isset($res->data['data'])) {
       $res->data['query'] = $query;
-      $this->setCache('listcustomer', $res->data);
+      $this->setCache('listcustomers', $res->data);
       return \Result::Success('', $res->data);
     }
 
@@ -233,7 +234,7 @@ class Openprovider {
     if (!OPENPROVIDER_ENABLED) return \Result::error('エラー：OpenProviderは無効です。');
     $cacheName = "getcustomer-{$handle}";
     $cache = $this->getCache($cacheName);
-    if (!empty($cache) && (isset($cache['handle']) && $cache['handle'] === $handle)) return \Result::Success('', $cache);
+    if ($this->isValidLifespan($cache, $handle, 'handle')) return \Result::Success('', $cache);
 
     $query = [ 'with_additional_data' => $withAdditionalData ? 'true' : 'false' ];
     $uri = "/customers/{$handle}?".http_build_query($query, '', '&', PHP_QUERY_RFC3986);
@@ -266,7 +267,7 @@ class Openprovider {
     $cacheName = $name && $ext ? "domainprices-{$name}.{$ext}" : 'domainprices';
 
     $cache = $this->getCache($cacheName);
-    if (!empty($cache)) return \Result::Success('', $cache);
+    if ($this->isValidLifespan($cache)) return \Result::Success('', $cache);
 
     $uri = "/domains/prices?".http_build_query($query, '', '&', PHP_QUERY_RFC3986);
     $curl = $this->setupCurl($uri);
@@ -292,7 +293,7 @@ class Openprovider {
   public function listTlds(array $query = []): \Result {
     if (!OPENPROVIDER_ENABLED) return \Result::error('エラー：OpenProviderは無効です。');
     $cache = $this->getCache('listtlds');
-    if (!empty($cache)) return \Result::Success('', $cache);
+    if ($this->isValidLifespan($cache)) return \Result::Success('', $cache);
 
     if (empty($query)) $query = [ 'limit' => 10, 'offset' => 0, 'order' => 'ASC' ];
     foreach ($query as $k => $v) if (is_bool($v)) $query[$k] = $v ? '1' : '0';
@@ -318,7 +319,7 @@ class Openprovider {
   public function getTld(string $tld, array $query = []): \Result {
     if (!OPENPROVIDER_ENABLED) return \Result::error('エラー：OpenProviderは無効です。');
     $cache = $this->getCache("gettld-{$tld}");
-    if (!empty($cache)) return \Result::Success('', $cache);
+    if ($this->isValidLifespan($cache)) return \Result::Success('', $cache);
 
     if (empty($query)) $query = [ 'limit' => 10, 'offset' => 0 ];
     foreach ($query as $k => $v) if (is_bool($v)) $query[$k] = $v ? '1' : '0';
@@ -359,7 +360,7 @@ class Openprovider {
   public function listDnsZones(array $query = []): \Result {
     if (!OPENPROVIDER_ENABLED) return \Result::error('エラー：OpenProviderは無効です。');
     $cache = $this->getCache('listdnszones');
-    if (!empty($cache)) return \Result::Success('', $cache);
+    if ($this->isValidLifespan($cache, $query)) return \Result::Success('', $cache);
 
     if (empty($query)) $query = [ 'limit' => 25, 'offset' => 0, 'order_by.name' => 'asc' ];
     foreach ($query as $k => $v) if (is_bool($v)) $query[$k] = $v ? '1' : '0';
@@ -385,7 +386,7 @@ class Openprovider {
   public function getDnsZone(string $domain, array $query = []): \Result {
     if (!OPENPROVIDER_ENABLED) return \Result::error('エラー：OpenProviderは無効です。');
     $cache = $this->getCache("getdnszone-{$domain}");
-    if (!empty($cache)) return \Result::Success('', $cache);
+    if ($this->isValidLifespan($cache)) return \Result::Success('', $cache);
 
     if (empty($query)) $query = [ 'limit' => 100, 'offset' => 0, 'order_by.name' => 'asc' ];
     foreach ($query as $k => $v) if (is_bool($v)) $query[$k] = $v ? '1' : '0';
@@ -412,7 +413,7 @@ class Openprovider {
   public function listZoneRecords(string $domain): \Result {
     if (!OPENPROVIDER_ENABLED) return \Result::error('エラー：OpenProviderは無効です。');
     $cache = $this->getCache("getzonerecords-{$domain}");
-    if (!empty($cache)) return \Result::Success('', $cache);
+    if ($this->isValidLifespan($cache)) return \Result::Success('', $cache);
 
     $curl = $this->setupCurl("/dns/zones/{$domain}/records");
     $res = $this->curlResult($curl);
@@ -502,6 +503,8 @@ class Openprovider {
       if (!mkdir($this->dataDir, 0755))
         return \Result::Error('エラー：ユーザーのアイコンディレクトリの作成に失敗。');
     }
+
+    $data['lifespan'] = time();
     $json = json_encode($data, JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
     if (file_put_contents("{$this->dataDir}{$type}.json", $json) === false) return \Result::Error('エラー：ユーザーデータの保存に失敗。');
 
@@ -530,4 +533,32 @@ class Openprovider {
 
     return $data;
   }
+
+  /**
+   * キャッシュを破壊する
+   *
+   * @param string $name  キャッシュのファイル名
+   * @return Result
+   */
+  private function murderCache(string $name): \Result {
+    if (!file_exists("{$this->dataDir}{$name}.json")) return \Result::Error('キャッシュファイルが存在しない。');
+    if (!unlink("{$this->dataDir}{$name}.json")) return \Result::Error('キャッシュファイルの削除に失敗。');
+    return \Result::Success();
+  }
+
+  /**
+   * キャッシュ有効期限の確認
+   *
+   * @param array $cache
+   * @param mixed $data  デフォルト＝null
+   * @param string $dataPoint  デフォルト＝query
+   * @return bool
+   */
+  private function isValidLifespan(array $cache, mixed $data = null, string $dataPoint = 'query'): bool {
+    if (NULL === $data) return (!empty($cache) && (isset($cache['lifespan']) && time() < ($cache['lifespan'] + $this->dataDuration)));
+    else return (!empty($cache)
+             && (isset($cache[$dataPoint])
+             && $cache[$dataPoint] === $data)
+             && (isset($cache['lifespan']) && time() < ($cache['lifespan'] + $this->dataDuration)));
+  }
 }
\ No newline at end of file