diff --git a/claude_setup.sh b/claude_setup.sh
index bcd49ef..2f90aac 100755
--- a/claude_setup.sh
+++ b/claude_setup.sh
@@ -303,6 +303,18 @@ _handle_api_response() {
       echo -e "\033[0;33m[СЕТЬ]\033[0m Не удалось проверить ключ (нет сети?). Продолжаю..."
       return 0
       ;;
+    400)
+      _emsg=$(_claude_extract_error "$body")
+      if echo "$_emsg" | grep -qi "RESOURCE_EXHAUSTED"; then
+        echo ""
+        echo -e "\033[0;33m[КВОТА ИСЧЕРПАНА]\033[0m Лимит запросов исчерпан."
+        [ -n "$topup_url" ] && echo "  $topup_url"
+        return 429
+      fi
+      # 400 = auth is valid, but max_tokens=1 is too small for thinking models
+      echo -e "\033[0;32mOK\033[0m"
+      return 0
+      ;;
     *)
       _emsg=$(_claude_extract_error "$body")
       echo ""