diff --git a/third_party/endpoints/constants.py b/third_party/endpoints/constants.py
new file mode 100644
index 0000000..29b683e
--- /dev/null
+++ b/third_party/endpoints/constants.py
@@ -0,0 +1,29 @@
+# Copyright 2016 Google Inc. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Provide various constants needed by Endpoints Framework.
+
+Putting them in this file makes it easier to avoid circular imports,
+as well as keep from complicating tests due to importing code that
+uses App Engine apis.
+"""
+
+from __future__ import absolute_import
+
+__all__ = [
+    'API_EXPLORER_CLIENT_ID',
+]
+
+
+API_EXPLORER_CLIENT_ID = '292824132082.apps.googleusercontent.com'