diff --git a/.zuul.yaml b/.zuul.yaml
index d8a4190..ffbb032 100644
--- a/.zuul.yaml
+++ b/.zuul.yaml
@@ -7,6 +7,9 @@
         - context: .
           repository: vexxhost/atmosphere-ingress
           target: atmosphere-ingress
+        - context: .
+          repository: vexxhost/atmosphere-usage
+          target: atmosphere-usage
 
 - job:
     name: atmosphere:image:upload
diff --git a/Dockerfile b/Dockerfile
index c7c81ee..42cd07f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -27,3 +27,6 @@ ENV FLASK_APP=atmosphere.app \
 
 FROM atmosphere AS atmosphere-ingress
 ENV UWSGI_WSGI_FILE=/usr/local/bin/atmosphere-ingress-wsgi
+
+FROM atmosphere AS atmosphere-usage
+ENV UWSGI_WSGI_FILE=/usr/local/bin/atmosphere-usage-wsgi
\ No newline at end of file
diff --git a/atmosphere/api/usage.py b/atmosphere/api/usage.py
new file mode 100644
index 0000000..ba31428
--- /dev/null
+++ b/atmosphere/api/usage.py
@@ -0,0 +1,62 @@
+# Copyright 2020 VEXXHOST, Inc.
+#
+# 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.
+
+"""Usage API."""
+
+from datetime import datetime
+
+from flask import abort
+from flask import Blueprint
+from flask import request
+from flask import jsonify
+from keystonemiddleware import auth_token
+from oslo_config import cfg
+
+from atmosphere.app import create_app
+from atmosphere import models
+
+CONF = cfg.CONF
+
+blueprint = Blueprint('usage', __name__)
+
+
+def init_application(config=None):
+    """Create usage API application."""
+    app = create_app(config)
+    app.register_blueprint(blueprint)
+
+    cfg.CONF([])
+    authtoken_config = dict(CONF.keystone_authtoken)
+    authtoken_config['log_name'] = app.name
+
+    app.wsgi_app = auth_token.AuthProtocol(app.wsgi_app, authtoken_config)
+    return app
+
+
+@blueprint.route('/v1/resources')
+def list_resources():
+    """List all resources for a specific project."""
+    # Project ID from request (or allow override if admin)
+    project_id = request.headers['X-Project-Id']
+    if 'admin' in request.headers['X-Roles'] and 'project_id' in request.args:
+        project_id = request.args['project_id']
+
+    try:
+        start = datetime.fromisoformat(request.args['start'])
+        end = datetime.fromisoformat(request.args['end'])
+    except (KeyError, ValueError):
+        abort(400)
+
+    resources = models.Resource.get_all_by_time_range(start, end, project_id)
+    return jsonify(resources)
diff --git a/atmosphere/tests/unit/api/test_ingress.py b/atmosphere/tests/unit/api/test_ingress.py
index 7f18f64..1cf187f 100644
--- a/atmosphere/tests/unit/api/test_ingress.py
+++ b/atmosphere/tests/unit/api/test_ingress.py
@@ -15,8 +15,25 @@
 from dateutil.relativedelta import relativedelta
 import pytest
 
+from atmosphere.api import ingress
 from atmosphere.tests.unit import fake
 from atmosphere import models
+from atmosphere.models import db
+
+
+@pytest.fixture
+def app():
+    app = ingress.init_application()
+    app.config['TESTING'] = True
+    app.config['SQLALCHEMY_ECHO'] = True
+    return app
+
+
+@pytest.fixture
+def _db(app):
+    db.init_app(app)
+    db.create_all()
+    return db
 
 
 @pytest.mark.usefixtures("client", "db_session")
diff --git a/atmosphere/tests/unit/api/test_usage.py b/atmosphere/tests/unit/api/test_usage.py
new file mode 100644
index 0000000..f118462
--- /dev/null
+++ b/atmosphere/tests/unit/api/test_usage.py
@@ -0,0 +1,37 @@
+# Copyright 2020 VEXXHOST, Inc.
+#
+# 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.
+
+from dateutil.relativedelta import relativedelta
+import pytest
+
+from atmosphere.api import usage
+from atmosphere.tests.unit import fake
+from atmosphere import models
+from atmosphere.models import db
+
+
+@pytest.fixture
+def app():
+    app = usage.init_application()
+    app.config['TESTING'] = True
+    app.config['SQLALCHEMY_ECHO'] = True
+    return app
+
+
+@pytest.mark.usefixtures("client")
+class TestResourceNoAuth:
+    def test_get_resources(self, client):
+        response = client.get('/v1/resources')
+
+        assert response.status_code == 401
diff --git a/atmosphere/tests/unit/conftest.py b/atmosphere/tests/unit/conftest.py
index acf2d47..cb009f3 100644
--- a/atmosphere/tests/unit/conftest.py
+++ b/atmosphere/tests/unit/conftest.py
@@ -18,7 +18,6 @@ from flask_sqlalchemy import SQLAlchemy
 
 from atmosphere.app import create_app
 from atmosphere.api import ingress
-from atmosphere.models import db
 
 
 @pytest.fixture(params=[
@@ -36,19 +35,3 @@ from atmosphere.models import db
 ])
 def ignored_event(request):
     yield request.param
-
-
-@pytest.fixture
-def app():
-    app = create_app()
-    app.config['TESTING'] = True
-    app.config['SQLALCHEMY_ECHO'] = True
-    app.register_blueprint(ingress.blueprint)
-    return app
-
-
-@pytest.fixture
-def _db(app):
-    db.init_app(app)
-    db.create_all()
-    return db
diff --git a/atmosphere/tests/unit/test_models.py b/atmosphere/tests/unit/test_models.py
index 56ee890..8d585dc 100644
--- a/atmosphere/tests/unit/test_models.py
+++ b/atmosphere/tests/unit/test_models.py
@@ -22,11 +22,28 @@ from dateutil.relativedelta import relativedelta
 from freezegun import freeze_time
 import before_after
 
+from atmosphere.api import ingress
 from atmosphere import models
+from atmosphere.models import db
 from atmosphere import exceptions
 from atmosphere.tests.unit import fake
 
 
+@pytest.fixture
+def app():
+    app = ingress.init_application()
+    app.config['TESTING'] = True
+    app.config['SQLALCHEMY_ECHO'] = True
+    return app
+
+
+@pytest.fixture
+def _db(app):
+    db.init_app(app)
+    db.create_all()
+    return db
+
+
 class GetOrCreateTestMixin:
     def test_with_existing_object(self):
         event = fake.get_normalized_event()
diff --git a/requirements.txt b/requirements.txt
index cf82064..f17f5d5 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,5 +2,6 @@ ceilometer
 Flask
 Flask-Migrate
 Flask-SQLAlchemy
+keystonemiddleware
 python-dateutil
 PyMySQL
diff --git a/setup.cfg b/setup.cfg
index 7fbd9ce..8c9a1d1 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -8,6 +8,7 @@ packages =
 [entry_points]
 wsgi_scripts =
     atmosphere-ingress-wsgi = atmosphere.api.ingress:init_application
+    atmosphere-usage-wsgi = atmosphere.api.usage:init_application
 
 [tool:pytest]
 mocked-sessions=atmosphere.models.db.session
diff --git a/tox.ini b/tox.ini
index bf4c8a9..1bbb1d7 100644
--- a/tox.ini
+++ b/tox.ini
@@ -4,10 +4,12 @@ skipsdist = True
 [testenv]
 envdir = {toxworkdir}/shared
 usedevelop = True
-setenv =
-    FLASK_APP=atmosphere.app
 passenv =
+    OS_*
+    FLASK_APP
     DATABASE_URI
+setenv =
+    FLASK_ENV=development
 deps =
     -r{toxinidir}/test-requirements.txt
     -r{toxinidir}/requirements.txt