diff --git a/tests/debug_auth_dependency.py b/tests/debug_auth_dependency.py
new file mode 100644
index 0000000..cf4c537
--- /dev/null
+++ b/tests/debug_auth_dependency.py
@@ -0,0 +1,24 @@
+import asyncio
+from typing import Optional
+from app.routers.dependencies_v3 import get_account_context_optional
+
+async def debug_auth():
+    print("--- Debugging get_account_context_optional ---")
+    
+    API_KEY = "IDF68Em5X4HTZlswRNgepQ"
+    
+    # Simulate Query Param
+    ctx = get_account_context_optional(
+        x_aether_api_key_query=API_KEY
+    )
+    
+    print(f"Auth Method: {ctx.auth_method}")
+    print(f"Account ID: {ctx.account_id}")
+    
+    if ctx.auth_method == 'guest':
+        print("❌ Result: Guest (Failure)")
+    else:
+        print(f"✅ Result: {ctx.auth_method} (Success)")
+
+if __name__ == "__main__":
+    asyncio.run(debug_auth())
diff --git a/tests/e2e/test_e2e_v3_hash_download.py b/tests/e2e/test_e2e_v3_hash_download.py
new file mode 100644
index 0000000..c37df39
--- /dev/null
+++ b/tests/e2e/test_e2e_v3_hash_download.py
@@ -0,0 +1,53 @@
+import requests
+
+# Configuration
+# The hash from your previous message
+FILE_HASH = "384fef832fa07b347a1d70927d0606b24cf41771202c1bfa00d7026764db2bb2"
+BASE_URL = f"https://dev-api.oneskyit.com/v3/action/hosted_file/hash/{FILE_HASH}/download"
+API_KEY = "PMM4n50teUCaOMMTN8qOJA"
+
+def test_hash_download_query_param():
+    print(f"--- Testing Hash Download via Query Param API Key ---")
+    
+    # Passing api_key in query string as requested
+    url = f"{BASE_URL}?api_key={API_KEY}"
+    
+    try:
+        response = requests.get(url)
+        print(f"Status: {response.status_code}")
+        
+        if response.status_code == 200:
+            print("✅ Success: File downloaded by hash!")
+            print(f"   Content-Length: {response.headers.get('Content-Length')}")
+            return True
+        else:
+            print(f"❌ Failed: {response.text}")
+            return False
+    except Exception as e:
+        print(f"💥 Exception: {e}")
+        return False
+
+def test_hash_download_header():
+    print(f"\n--- Testing Hash Download via Header API Key ---")
+    
+    headers = {"X-Aether-API-Key": API_KEY}
+    
+    try:
+        response = requests.get(BASE_URL, headers=headers)
+        print(f"Status: {response.status_code}")
+        
+        if response.status_code == 200:
+            print("✅ Success: File downloaded by hash via header!")
+            return True
+        else:
+            print(f"❌ Failed: {response.status_code}")
+            return False
+    except Exception as e:
+        print(f"💥 Exception: {e}")
+        return False
+
+if __name__ == "__main__":
+    s1 = test_hash_download_query_param()
+    s2 = test_hash_download_header()
+    if s1 and s2:
+        print("\n🎉 HASH DOWNLOAD TESTS PASSED!")