diff --git a/synapse/rest/client/v2_alpha/capabilities.py b/synapse/rest/client/v2_alpha/capabilities.py
new file mode 100644
index 000000000..d73153ccc
--- /dev/null
+++ b/synapse/rest/client/v2_alpha/capabilities.py
@@ -0,0 +1,49 @@
+# -*- coding: utf-8 -*-
+# Copyright 2019 New Vector
+#
+# 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 synapse.http.servlet import RestServlet
+
+from ._base import client_v2_patterns
+
+
+class CapabilitiesRestServlet(RestServlet):
+    PATTERNS = client_v2_patterns("/capabilities$")
+
+    def __init__(self, hs):
+        """
+        Args:
+            hs (synapse.server.HomeServer): server
+        """
+        super(CapabilitiesRestServlet, self).__init__()
+        self.hs = hs
+
+    def on_GET(self, request):
+        return 200, {
+            "capabilities": {
+                "m.room_versions": {
+                    "default": "1",
+                    "available": {
+                        "1": "stable",
+                        "2": "stable",
+                        "state-v2-test": "unstable",
+                        "3": "unstable"
+                    }
+                }
+            }
+        }
+
+
+def register_servlets(hs, http_server):
+    CapabilitiesRestServlet(hs).register(http_server)
diff --git a/tests/rest/client/v2_alpha/test_capabilities.py b/tests/rest/client/v2_alpha/test_capabilities.py
new file mode 100644
index 000000000..1a0ed8d12
--- /dev/null
+++ b/tests/rest/client/v2_alpha/test_capabilities.py
@@ -0,0 +1,39 @@
+# -*- coding: utf-8 -*-
+# Copyright 2019 New Vector Ltd
+#
+# 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 synapse.api.constants import DEFAULT_ROOM_VERSION, KNOWN_ROOM_VERSIONS
+from synapse.rest.client.v2_alpha.capabilities import register_servlets
+
+from tests import unittest
+
+
+class CapabilitiesTestCase(unittest.HomeserverTestCase):
+    servlets = [register_servlets]
+
+    def make_homeserver(self, reactor, clock):
+        self.url = b"/_matrix/client/r0/capabilities"
+        hs = self.setup_test_homeserver()
+        return hs
+
+    def test_get_room_version_capabilities(self):
+        request, channel = self.make_request("GET", self.url)
+        self.render(request)
+        capabilities = channel.json_body['capabilities']
+        self.assertEqual(channel.code, 200)
+        for room_version in capabilities['m.room_versions']['available'].keys():
+            self.assertTrue(room_version in KNOWN_ROOM_VERSIONS, "" + room_version)
+        self.assertEqual(
+            DEFAULT_ROOM_VERSION, capabilities['m.room_versions']['default']
+        )