diff --git a/ox/api.py b/ox/api.py
index 6f9aa67..4b56fa6 100644
--- a/ox/api.py
+++ b/ox/api.py
@@ -137,3 +137,27 @@ class API(object):
                 for chunk in iter(lambda: u.read(chunk_size), b''):
                     fd.write(chunk)
             shutil.move(tmpname, filename)
+
+
+def signin(site):
+    from getpass import getpass
+    from .web import auth
+    api = API('https://%s/api/' % site)
+    update = False
+    try:
+        credentials = auth.get(site)
+    except:
+        credentials = {}
+        print('Please provide your username and password for %s:' % site)
+        credentials['username'] = input('Username: ')
+        credentials['password'] = getpass('Password: ')
+        update = True
+    r = api.signin(**credentials)
+    if 'errors' in r.get('data', {}):
+        for kv in r['data']['errors'].items():
+            print('%s: %s' % kv)
+        sys.exit(1)
+    if update:
+        auth.update(site, credentials)
+    return api
+