diff --git a/app/Jobs/Host/CancelExpiredHostJob.php b/app/Jobs/Host/CancelExpiredHostJob.php
new file mode 100644
index 0000000..4f6926a
--- /dev/null
+++ b/app/Jobs/Host/CancelExpiredHostJob.php
@@ -0,0 +1,73 @@
+<?php
+
+namespace App\Jobs\Host;
+
+use App\Models\Host;
+use Illuminate\Bus\Queueable;
+use Illuminate\Contracts\Queue\ShouldQueue;
+use Illuminate\Foundation\Bus\Dispatchable;
+use Illuminate\Queue\InteractsWithQueue;
+use Illuminate\Queue\SerializesModels;
+
+class CancelExpiredHostJob implements ShouldQueue
+{
+    use Dispatchable, InteractsWithQueue, Queueable, SerializesModels;
+
+    protected ?Host $host;
+
+    /**
+     * Create a new job instance.
+     *
+     * @return void
+     */
+    public function __construct(Host $host = null)
+    {
+        $this->host = $host;
+
+        $this->onQueue('host-cost');
+    }
+
+    /**
+     * Execute the job.
+     */
+    public function handle(): void
+    {
+        $now = now();
+
+        if (! $this->host) {
+            $host = new Host();
+
+            // 查找试用到期的主机
+            $host->where('day_at', $now->day)
+                ->where('hour_at', $now->hour)
+                ->where('trial_ends_at', '<', $now)
+                ->chunk(500, function ($hosts) {
+                    $hosts->each(function ($host) {
+                        /* @var Host $host */
+
+                        if ($host->module->isUp()) {
+                            dispatch(new self($host));
+                        }
+                    });
+                });
+
+            // 查找到期的主机
+            $host->where('expired_at', '<', $now)
+                ->chunk(500, function ($hosts) {
+                    $hosts->each(function ($host) {
+                        /* @var Host $host */
+
+                        if ($host->module->isUp()) {
+                            dispatch(new self($host));
+                        }
+                    });
+                });
+        } else {
+            if ($this->host->isNextMonthCancel()) {
+                $this->host->safeDelete();
+            } else {
+                $this->host->cost();
+            }
+        }
+    }
+}
diff --git a/app/Notifications/User/BalanceNotEnough.php b/app/Notifications/User/BalanceNotEnough.php
new file mode 100644
index 0000000..90581ab
--- /dev/null
+++ b/app/Notifications/User/BalanceNotEnough.php
@@ -0,0 +1,46 @@
+<?php
+
+namespace App\Notifications\User;
+
+use App\Models\User;
+use App\Notifications\Channels\WebChannel;
+use Illuminate\Bus\Queueable;
+use Illuminate\Notifications\Messages\MailMessage;
+use Illuminate\Notifications\Notification;
+
+class BalanceNotEnough extends Notification
+{
+    use Queueable;
+
+    /**
+     * Get the notification's delivery channels.
+     */
+    public function via(): array
+    {
+        return [WebChannel::class, 'mail'];
+    }
+
+    /**
+     * Get the mail representation of the notification.
+     */
+    public function toMail(User $user): MailMessage
+    {
+        return (new MailMessage)
+            ->subject('账户余额不足')
+            ->greeting('您好，'.$user->name)
+            ->line('账户余额不足')
+            ->line('一个或多个主机已被暂停。')
+            ->action('查看主机', route('hosts.index'));
+    }
+
+    /**
+     * Get the array representation of the notification.
+     */
+    public function toArray(): array
+    {
+        return [
+            'title' => '账户余额不足',
+            'message' => '被影响的主机已暂停。',
+        ];
+    }
+}