diff --git a/scraper_service.py b/scraper_service.py
index 5ac4a75..9244512 100644
--- a/scraper_service.py
+++ b/scraper_service.py
@@ -1279,7 +1279,10 @@ def scrape_yahoo_options(symbol, expiration=None, strike_limit=25):
 
 @app.route("/scrape_sync")
 def scrape_sync():
-    symbol = request.args.get("stock", "MSFT")
+    symbol = request.args.get("stock")
+    if not symbol:
+        return jsonify({"error": "Missing 'stock' parameter"}), 400
+
     expiration = (
         request.args.get("expiration")
         or request.args.get("expiry")
@@ -1297,7 +1300,10 @@ def scrape_sync():
 
 @app.route("/profile")
 def profile():
-    symbol = request.args.get("stock", "MSFT")
+    symbol = request.args.get("stock")
+    if not symbol:
+        return jsonify({"error": "Missing 'stock' parameter"}), 400
+
     app.logger.info("Received /profile request for symbol=%s", symbol)
     return jsonify(scrape_yahoo_profile(symbol))