diff --git a/app/Http/Controllers/Site/ReportController.php b/app/Http/Controllers/Site/ReportController.php
index 31476d8..e8fa375 100644
--- a/app/Http/Controllers/Site/ReportController.php
+++ b/app/Http/Controllers/Site/ReportController.php
@@ -118,8 +118,20 @@ class ReportController extends Controller
             }
         }
         if (count($prises) === 0) {
+            $config = app(ConfigService::class);
+            if (!$config->getBool('show_last_price', false)) {
+                return ['sell' => 0, 'buy' => 0];
+            }
+
             $price = Price::orderBy('id', 'desc')->first();
-            $priceValue = $price->price;
+            $priceValue = $price ? (float) $price->price : 0.0;
+
+            if (
+                $priceValue <= 0
+                || !$this->isPlausibleStoredPrice($priceValue, $config->priceProvider(), $config)
+            ) {
+                return ['sell' => 0, 'buy' => 0];
+            }
 
             return ['sell' => $priceValue - $diffSell, 'buy' => $priceValue + $diffBuy];
         }
@@ -134,6 +146,40 @@ class ReportController extends Controller
         return $payload;
     }
 
+    /**
+     * جلوگیری از fallback به قیمت ذخیره‌شدهٔ نامعتبر (مثلاً طلا ~785M روی پروژه مس).
+     */
+    protected function isPlausibleStoredPrice(float $storedPrice, string $priceProvider, ConfigService $config): bool
+    {
+        if ($storedPrice <= 0) {
+            return false;
+        }
+
+        $up = (float) $config->get('up_price', 0);
+        $down = (float) $config->get('down_price', 0);
+
+        if ($up > 0 && $down > 0) {
+            $min = min($up, $down);
+            $max = max($up, $down);
+
+            if ($storedPrice < $min * 0.25 || $storedPrice > $max * 4) {
+                return false;
+            }
+
+            return true;
+        }
+
+        if (in_array($priceProvider, ['zaarbox', 'main_product'], true)) {
+            return $storedPrice < 100_000_000;
+        }
+
+        if ($priceProvider === 'montzar') {
+            return $storedPrice > 1_000_000 && $storedPrice < 500_000_000;
+        }
+
+        return $storedPrice < 500_000_000;
+    }
+
     public function lastPrice()
     {
         $config = app(ConfigService::class);
@@ -215,11 +261,10 @@ class ReportController extends Controller
             'main_product_price',
             'buy_fee',
             'sell_fee',
-            'show_last_price',
         ])->get();
 
         $settingsMap = $settings->pluck('value', 'key');
-        $show_last_price = $toBool($settingsMap->get('show_last_price', false));
+        $show_last_price = $config->getBool('show_last_price', false);
         $taban_gohar_price = $settingsMap->get('tabanGohar_price');
         $main_product_price = $settingsMap->get('main_product_price');
 
@@ -409,8 +454,12 @@ class ReportController extends Controller
             }
 
             $lastPrice = Price::latest()->first();
+            $storedPrice = $lastPrice ? (float) $lastPrice->price : 0.0;
 
-            if (!$lastPrice || (float) $lastPrice->price <= 0) {
+            if (
+                $storedPrice <= 0
+                || !$this->isPlausibleStoredPrice($storedPrice, $priceProvider, $config)
+            ) {
                 return $this->appendUpPrices([
                     'sell' => 0,
                     'buy' => 0,
@@ -425,7 +474,7 @@ class ReportController extends Controller
                 ]);
             }
 
-            $priceValue = (float) $lastPrice->price;
+            $priceValue = $storedPrice;
             $priceSource = 'database_last';
         }
 
@@ -509,7 +558,7 @@ class ReportController extends Controller
         }
 
         /*
-         | main_product / zaarbox: سفارش از Price::latest() — نمایش buy/sell همان منبع.
+         | main_product / zaarbox: buy/sell از همان قیمت زنده (نه رکورد قدیمی DB).
          */
         if (in_array($priceProvider, ['main_product', 'zaarbox'], true) && !$closed) {
             $base = (float) $priceValue;
diff --git a/config/price_providers.php b/config/price_providers.php
index 9905c36..399f6e9 100644
--- a/config/price_providers.php
+++ b/config/price_providers.php
@@ -26,4 +26,6 @@ return [
     'profit_gold_api_enabled' => false,
     'open_register' => true,
     'auto_active_customer' => false,
+    /** null/خالی در settings = false — فقط وقتی API قطع است از prices استفاده شود */
+    'show_last_price' => false,
 ];