diff --git a/README.md b/README.md
index 51d6262..2b06986 100644
--- a/README.md
+++ b/README.md
@@ -124,7 +124,7 @@ curl -X POST http://localhost:3000/clear-all-sms
 **Пример запроса:**
 
 ```bash
-curl http://localhost:3000/balance
+curl http://localhost:3000/balance.php
 ```
 
 **Ответ:**
@@ -171,7 +171,7 @@ environment:
 - `POST /sms/send`
 - `GET /sms/view-all-sms`
 - `POST /sms/clear-all-sms`
-- `GET /sms/balance`
+- `GET /sms/balance.php`
 - `GET /sms/` - веб-интерфейс
 
 Изменение порта в docker-compose.yml:
diff --git a/VERSION b/VERSION
index 9fc80f9..87a0871 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-0.3.2
\ No newline at end of file
+0.3.3
\ No newline at end of file
diff --git a/server.js b/server.js
index deb9951..c71e269 100644
--- a/server.js
+++ b/server.js
@@ -86,7 +86,17 @@ router.post("/clear-all-sms", (req, res) => {
 });
 
 // GET /balance - get account balance (SMSC API compatible)
-router.get("/balance", (req, res) => {
+router.get("/balance.php", (req, res) => {
+  const { login, psw } = req.query;
+
+  if (!login || !psw) {
+    return res.json({ error: "Отсутствуют обязательные параметры", error_code: 1 });
+  }
+
+  if (login !== AUTH_LOGIN || psw !== AUTH_PASSWORD) {
+    return res.json({ error: "Ошибка авторизации", error_code: 2 });
+  }
+
   res.json({ balance: "1000.00" });
 });