diff --git a/install_files/ansible-base/roles/build-securedrop-app-code-deb-pkg/files/usr.sbin.apache2 b/install_files/ansible-base/roles/build-securedrop-app-code-deb-pkg/files/usr.sbin.apache2
index f5f34c9d6f..cac98dc0df 100644
--- a/install_files/ansible-base/roles/build-securedrop-app-code-deb-pkg/files/usr.sbin.apache2
+++ b/install_files/ansible-base/roles/build-securedrop-app-code-deb-pkg/files/usr.sbin.apache2
@@ -135,6 +135,8 @@
   /var/lib/securedrop/shredder/*/ w,
   /var/lib/securedrop/store/** rw,
   /var/lib/securedrop/store/*/ w,
+  /var/lib/securedrop/source_v2_url r,
+  /var/lib/securedrop/source_v3_url r,
   /var/lib/securedrop/tmp/** rw,
   /var/lib/ssl/* r,
   /var/log/apache2/* w,
diff --git a/securedrop/source_app/api.py b/securedrop/source_app/api.py
index e6171211c7..07f600fb97 100644
--- a/securedrop/source_app/api.py
+++ b/securedrop/source_app/api.py
@@ -3,6 +3,8 @@
 
 from flask import Blueprint, current_app, make_response
 
+from source_app.utils import get_sourcev2_url, get_sourcev3_url
+
 import version
 
 
@@ -16,7 +18,9 @@ def metadata():
             'gpg_fpr': config.JOURNALIST_KEY,
             'sd_version': version.__version__,
             'server_os': platform.linux_distribution()[1],
-            'supported_languages': config.SUPPORTED_LOCALES
+            'supported_languages': config.SUPPORTED_LOCALES,
+            'v2_source_url': get_sourcev2_url(),
+            'v3_source_url': get_sourcev3_url()
         }
         resp = make_response(json.dumps(meta))
         resp.headers['Content-Type'] = 'application/json'
diff --git a/securedrop/source_app/utils.py b/securedrop/source_app/utils.py
index 39acd00b04..0a5475567f 100644
--- a/securedrop/source_app/utils.py
+++ b/securedrop/source_app/utils.py
@@ -9,6 +9,7 @@
 from threading import Thread
 
 import i18n
+import re
 
 from crypto_util import CryptoException
 from models import Source
@@ -112,3 +113,31 @@ def normalize_timestamps(filesystem_id):
                 "Couldn't normalize submission "
                 "timestamps (touch exited with %d)" %
                 rc)
+
+
+def check_url_file(path, regexp):
+    """
+    Check that a file exists at the path given and contains a single line
+    matching the regexp. Used for checking the source interface address
+    files at /var/lib/securedrop/source_{v2,v3}_url.
+    """
+    try:
+        f = open(path, "r")
+        contents = f.readline().strip()
+        f.close()
+        if re.match(regexp, contents):
+            return contents
+        else:
+            return None
+    except IOError:
+        return None
+
+
+def get_sourcev2_url():
+    return check_url_file("/var/lib/securedrop/source_v2_url",
+                          r"^[a-z0-9]{16}\.onion$")
+
+
+def get_sourcev3_url():
+    return check_url_file("/var/lib/securedrop/source_v3_url",
+                          r"^[a-z0-9]{56}\.onion$")
diff --git a/securedrop/tests/test_source.py b/securedrop/tests/test_source.py
index 7cf06ae7f4..767c1245c7 100644
--- a/securedrop/tests/test_source.py
+++ b/securedrop/tests/test_source.py
@@ -558,6 +558,32 @@ def test_metadata_route(config, source_app):
             assert resp.json.get('server_os') == '16.04'
             assert resp.json.get('supported_languages') ==\
                 config.SUPPORTED_LOCALES
+            assert resp.json.get('v2_source_url') is None
+            assert resp.json.get('v3_source_url') is None
+
+
+def test_metadata_v2_url(config, source_app):
+    onion_test_url = "abcdabcdabcdabcd.onion"
+    with patch.object(source_app_api, "get_sourcev2_url") as mocked_v2_url:
+        mocked_v2_url.return_value = (onion_test_url)
+        with source_app.test_client() as app:
+            resp = app.get(url_for('api.metadata'))
+            assert resp.status_code == 200
+            assert resp.headers.get('Content-Type') == 'application/json'
+            assert resp.json.get('v2_source_url') == onion_test_url
+            assert resp.json.get('v3_source_url') is None
+
+
+def test_metadata_v3_url(config, source_app):
+    onion_test_url = "abcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefgh.onion"
+    with patch.object(source_app_api, "get_sourcev3_url") as mocked_v3_url:
+        mocked_v3_url.return_value = (onion_test_url)
+        with source_app.test_client() as app:
+            resp = app.get(url_for('api.metadata'))
+            assert resp.status_code == 200
+            assert resp.headers.get('Content-Type') == 'application/json'
+            assert resp.json.get('v2_source_url') is None
+            assert resp.json.get('v3_source_url') == onion_test_url
 
 
 def test_login_with_overly_long_codename(source_app):
diff --git a/securedrop/tests/test_source_utils.py b/securedrop/tests/test_source_utils.py
new file mode 100644
index 0000000000..1a5b998b00
--- /dev/null
+++ b/securedrop/tests/test_source_utils.py
@@ -0,0 +1,30 @@
+# -*- coding: utf-8 -*-
+import os
+
+from source_app.utils import check_url_file
+
+
+def test_check_url_file(config):
+
+    assert check_url_file("nosuchfile", "whatever") is None
+
+    try:
+        def write_url_file(path, content):
+            url_file = open(path, "w")
+            url_file.write("{}\n".format(content))
+
+        url_path = "test_source_url"
+
+        onion_test_url = "abcdabcdabcdabcd.onion"
+        write_url_file(url_path, onion_test_url)
+        assert check_url_file(url_path, r"^[a-z0-9]{16}\.onion$") == onion_test_url
+
+        onion_test_url = "abcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefgh.onion"
+        write_url_file(url_path, onion_test_url)
+        assert check_url_file(url_path, r"^[a-z0-9]{56}\.onion$") == onion_test_url
+
+        write_url_file(url_path, "NO.onion")
+        assert check_url_file(url_path, r"^[a-z0-9]{56}\.onion$") is None
+    finally:
+        if os.path.exists(url_path):
+            os.unlink(url_path)