diff --git a/src/lotto_buyer.py b/src/lotto_buyer.py
index b44a41a..9a08be4 100644
--- a/src/lotto_buyer.py
+++ b/src/lotto_buyer.py
@@ -126,14 +126,11 @@ class LottoBuyer:
         try:
             self.session.headers.update({"Referer": f"{BASE_URL}/mypage/home"})
             response = self.session.get(
-                f"{BASE_URL}/mypage/getMndpInfo.do", timeout=30
+                f"{BASE_URL}/mypage/selectUserMndp.do", timeout=30
             )
             data = response.json()
-            mndp = data.get("data", {})
-            # 예치금 잔액 = 입금액 합계 - 출금액 합계
-            deposit = int(mndp.get("csblDpstAmt", 0) or 0)
-            withdraw = int(mndp.get("csblTkmnyAmt", 0) or 0)
-            return max(0, deposit - withdraw)
+            mndp = data.get("data", {}).get("userMndp", {})
+            return int(mndp.get("totalAmt", 0) or 0)
         except Exception:
             return 0