diff --git a/app/Console/Commands/System/Down.php b/app/Console/Commands/System/Down.php
new file mode 100644
index 0000000..cc89ae8
--- /dev/null
+++ b/app/Console/Commands/System/Down.php
@@ -0,0 +1,51 @@
+<?php
+
+namespace App\Console\Commands\System;
+
+use Illuminate\Console\Command;
+use Illuminate\Support\Facades\Cache;
+
+class Down extends Command
+{
+    /**
+     * The name and signature of the console command.
+     *
+     * @var string
+     */
+    protected $signature = 'down';
+
+    /**
+     * The console command description.
+     *
+     * @var string
+     */
+    protected $description = '启动维护模式。';
+
+    /**
+     * Create a new command instance.
+     *
+     * @return void
+     */
+    public function __construct()
+    {
+        parent::__construct();
+    }
+
+    /**
+     * Execute the console command.
+     *
+     * @return mixed
+     */
+    public function handle()
+    {
+        //
+
+        // 记录到缓存(维护最长 2 小时)
+
+        Cache::put('system_down', true, now()->addHours(2));
+
+        $this->info('API 已进入维护模式，将在 2 小时后自动关闭。');
+        $this->warn('请注意，维护模式只会拦截用户的请求，不会影响模块通信。');
+
+    }
+}
diff --git a/app/Console/Commands/System/Up.php b/app/Console/Commands/System/Up.php
new file mode 100644
index 0000000..ff26147
--- /dev/null
+++ b/app/Console/Commands/System/Up.php
@@ -0,0 +1,49 @@
+<?php
+
+namespace App\Console\Commands\System;
+
+use Illuminate\Console\Command;
+use Illuminate\Support\Facades\Cache;
+
+class Up extends Command
+{
+    /**
+     * The name and signature of the console command.
+     *
+     * @var string
+     */
+    protected $signature = 'up';
+
+    /**
+     * The console command description.
+     *
+     * @var string
+     */
+    protected $description = '关闭维护模式。';
+
+    /**
+     * Create a new command instance.
+     *
+     * @return void
+     */
+    public function __construct()
+    {
+        parent::__construct();
+    }
+
+    /**
+     * Execute the console command.
+     *
+     * @return mixed
+     */
+    public function handle()
+    {
+        //
+
+        Cache::delete('system_down');
+
+        $this->info('维护模式已关闭。');
+
+        // maintenance_mode(false);
+    }
+}
diff --git a/app/Console/Kernel.php b/app/Console/Kernel.php
index ebad1ea..521ef96 100644
--- a/app/Console/Kernel.php
+++ b/app/Console/Kernel.php
@@ -34,6 +34,8 @@ class Kernel extends ConsoleKernel
         UserAddBalance::class,
         GetUser::class,
         ReduceBalance::class,
+        Commands\System\Down::class,
+        Commands\System\Up::class,
     ];
 
     /**
diff --git a/app/Http/Controllers/User/BalanceController.php b/app/Http/Controllers/User/BalanceController.php
index 9f33b46..43995c6 100644
--- a/app/Http/Controllers/User/BalanceController.php
+++ b/app/Http/Controllers/User/BalanceController.php
@@ -213,7 +213,6 @@ public function drops()
             'drops' => $transactions->getDrops($user_id),
             // 'monthly_usages' => (double) Cache::get($cache_key, 0),
             'rate' => config('drops.rate'),
-            'decimal' => config('drops.decimal'),
         ];
 
         return $this->success($resp);
diff --git a/app/Http/Middleware/Maintenance.php b/app/Http/Middleware/Maintenance.php
new file mode 100644
index 0000000..82a021f
--- /dev/null
+++ b/app/Http/Middleware/Maintenance.php
@@ -0,0 +1,31 @@
+<?php
+
+namespace App\Http\Middleware;
+
+use Closure;
+use Illuminate\Support\Facades\Cache;
+
+class Maintenance
+{
+    /**
+     * Handle an incoming request.
+     *
+     * @param  \Illuminate\Http\Request  $request
+     * @param  \Closure  $next
+     * @return mixed
+     */
+    public function handle($request, Closure $next)
+    {
+
+        // if cache has system down
+        if (Cache::has('system_down')) {
+            return response()->json([
+                'message' => '我们正在进行维护，请稍等 2 小时后再来。',
+            ], 503);
+        }
+
+
+        // continue
+        return $next($request);
+    }
+}
diff --git a/app/Models/Host.php b/app/Models/Host.php
index da2f6c8..01e2d72 100644
--- a/app/Models/Host.php
+++ b/app/Models/Host.php
@@ -138,8 +138,6 @@ public function cost($price = null, $auto = true)
 
         Cache::put($month_cache_key, $hosts_drops, 604800);
 
-        $this->price *= config('drops.decimal');
-
         $transaction->reduceDrops($this->user_id, $this->id, $this->module_id, $auto, $this->price);
 
         broadcast(new UserEvent($this->user_id, 'balances.drops.reduced', $this->user));
diff --git a/app/Models/Transaction.php b/app/Models/Transaction.php
index 966a90f..be54f52 100644
--- a/app/Models/Transaction.php
+++ b/app/Models/Transaction.php
@@ -77,13 +77,11 @@ public function getDrops($user_id = null)
 
         $cache_key = 'user_drops_' . $user_id;
 
-        $decimal = config('drops.decimal');
+        $drops = Cache::get($cache_key, [
+            'drops' => 0,
+        ]);
 
-        $drops = Cache::get($cache_key);
-
-        $drops = $drops / $decimal;
-
-        return $drops;
+        return $drops['drops'];
     }
 
     public function increaseCurrentUserDrops($amount = 0)
@@ -96,14 +94,15 @@ public function increaseDrops($user_id, $amount = 0)
     {
         $cache_key = 'user_drops_' . $user_id;
 
-        $decimal = config('drops.decimal');
+        $current_drops = Cache::get($cache_key, [
+            'drops' => 0,
+        ]);
 
+        $current_drops['drops'] += $amount;
 
-        $amount = $amount * $decimal;
+        Cache::forever($cache_key, $current_drops);
 
-        $drops = Cache::increment($cache_key, $amount);
-
-        return $drops;
+        return $current_drops['drops'];
     }
 
 
@@ -112,9 +111,15 @@ public function reduceDrops($user_id, $host_id, $module_id, $auto = 1, $amount =
 
         $cache_key = 'user_drops_' . $user_id;
 
-        $decimal = config('drops.decimal');
+        $current_drops = Cache::get($cache_key, [
+            'drops' => 0,
+        ]);
 
-        Cache::decrement($cache_key, $amount);
+        $current_drops['drops'] = $current_drops['drops'] - $amount;
+
+        $current_drops['drops'] = round($current_drops['drops'], 5);
+
+        Cache::forever($cache_key, $current_drops);
 
         if ($auto) {
             $description = '平台按时间自动扣费。';
@@ -122,8 +127,7 @@ public function reduceDrops($user_id, $host_id, $module_id, $auto = 1, $amount =
             $description = '集成模块发起的扣费。';
         }
 
-        $this->addPayoutDrops($user_id, $amount / $decimal, $description, $host_id, $module_id);
-        // $this->addPayoutDrops($user_id, $amount, $description, $host_id, $module_id);
+        $this->addPayoutDrops($user_id, $amount, $description, $host_id, $module_id);
     }
 
 
diff --git a/bootstrap/app.php b/bootstrap/app.php
index f6bbd59..f5b85bc 100644
--- a/bootstrap/app.php
+++ b/bootstrap/app.php
@@ -97,6 +97,7 @@
 
 $app->routeMiddleware([
     'auth' => App\Http\Middleware\Authenticate::class,
+    'maintenance' => App\Http\Middleware\Maintenance::class,
     // 'remote' => [
     //     \Illuminate\Routing\Middleware\SubstituteBindings::class,
     //     \App\Http\Middleware\AllowCors::class,
@@ -147,7 +148,7 @@
 $app->router->group([
     'namespace' => 'App\Http\Controllers',
     'prefix' => 'api',
-    'middleware' => ['auth:api'],
+    'middleware' => ['maintenance', 'auth:api'],
 ], function ($router) {
     require __DIR__ . '/../routes/api.php';
 });
diff --git a/database/migrations/2022_10_03_123715_convert_user_drops.php b/database/migrations/2022_10_03_123715_convert_user_drops.php
new file mode 100644
index 0000000..817d5f6
--- /dev/null
+++ b/database/migrations/2022_10_03_123715_convert_user_drops.php
@@ -0,0 +1,53 @@
+<?php
+
+use App\Models\User;
+use Illuminate\Support\Facades\Cache;
+use Illuminate\Database\Migrations\Migration;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        //
+
+        $decimal = config('drops.decimal');
+
+        User::chunk(100, function ($users) use ($decimal) {
+            foreach ($users as $user) {
+
+                $cache_key = 'user_drops_' . $user->id;
+
+                $drops = Cache::get($cache_key);
+
+                if (!is_array($drops)) {
+                    $drops = [
+                        'drops' => $drops,
+                    ];
+                }
+
+                $drops = $drops['drops'] / $decimal;
+
+                $drops = [
+                    'drops' => $drops,
+                ];
+
+                Cache::forever($cache_key, $drops);
+            }
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        //
+    }
+};