diff --git a/README.md b/README.md
index 3a36182..61c9e3f 100644
--- a/README.md
+++ b/README.md
@@ -18,6 +18,8 @@ All configuration is handled through environment variables.
 | `IDINVITE_OIDC_SCOPE`               | `["openid", "email", "profile"]`                                        | JSON list of OIDC scopes to request. The OIDC IDP will need to send the group attribute. |
 | `IDINVITE_OIDC_USER_ATTR`           | `email`                                                                 | The attribute to use as the user ID.                                                     |
 | `HMDOORIS_REQUIRES_GROUP`           | -                                                                       | Set to require users to be a member of this groups.                                      |
+| `HMDOORIS_SPACEAPI_OPEND_NAME`      | -                                                                       | Name of the device to send `spaceapid` updates for                                       |
+| `HMDOORIS_SPACEAPI_OPEN_URL`        | -                                                                       | URL for the `spaceapid` open update endpoint.                                            |
 | `HMDOORIS_URL`                      | `http://localhost:3000`                                                 | URL of the application, used to construct links to itself.                               |
 
 ### Required Group
@@ -34,6 +36,14 @@ RaspberryMatic. If you are using a private certificate, you will need to use `HM
 the HTTP client to a suitable CA certificate. Setting the variable to `false` will disable certificate verification.
 Alternatively, you can use plain `http`.
 
+### SpaceAPI
+
+[spaceapid](https://git.hamburg.ccc.de/CCCHH/spaceapid) can be used to provide data
+for [SpaceAPI](https://spaceapi.io), and it's open update endpoint can be used to report the open status of a space. By
+setting `HMDOORIS_SPACEAPI_OPEND_NAME` to the name of the lock on the main door, and `HMDOORIS_SPACEAPI_OPEN_URL` to the
+update endpoint URL hmdooris can update the open status whenever it changes. Add the username and password in the url,
+in the `https://user:pass@hostname.tld` format. If you do not set the name, no updates will be sent.
+
 ## Managing the CCU certificate
 
 If you want to talk to the RaspberryMatic/CCU-Jack and you are using a self-signed certificate (which is the default),
diff --git a/hmdooris/AppConfig.py b/hmdooris/AppConfig.py
index 5915f1b..6ec569b 100644
--- a/hmdooris/AppConfig.py
+++ b/hmdooris/AppConfig.py
@@ -28,6 +28,8 @@ class AppConfig:
         self.ccujack_certificate_path = getenv('HMDOORIS_CCUJACK_CERTIFICATE_PATH', None)
         self.ccujack_username = getenv('HMDOORIS_CCUJACK_USERNAME', None)
         self.ccujack_password = getenv('HMDOORIS_CCUJACK_PASSWORD', None)
+        self.spaceapid_open_name = getenv('HMDOORIS_SPACEAPI_OPEND_NAME', None)
+        self.spaceapid_open_url = getenv('HMDOORIS_SPACEAPI_OPEN_URL', 'https://spaceapi.hamburg.ccc.de/state/open')
 
         if self.debug is not None and self.debug.lower not in ('0', 'f', 'false'):
             self.debug = True
diff --git a/hmdooris/__main__.py b/hmdooris/__main__.py
index d073256..19ef01c 100644
--- a/hmdooris/__main__.py
+++ b/hmdooris/__main__.py
@@ -39,7 +39,10 @@ auth = BottleOIDC(app, config={
 
 websocket_clients = WebSocketClients()
 bottle_helpers = BottleHelpers(auth, group=config.requires_group, allowed=config.allowed)
-update_poller = UpdatePoller(websocket_clients, ccujack, 1 if config.debug else 0.1)
+update_poller = UpdatePoller(websocket_clients, ccujack,
+                             update_delay=1 if config.debug else 0.1,
+                             spaceapid_open_name=config.spaceapid_open_name,
+                             spaceapid_open_url=config.spaceapid_open_url)
 
 
 @app.route("/static/<filepath>")
diff --git a/hmdooris/updatepoller.py b/hmdooris/updatepoller.py
index ce16003..5a668b0 100644
--- a/hmdooris/updatepoller.py
+++ b/hmdooris/updatepoller.py
@@ -3,16 +3,23 @@ import logging
 from threading import Thread
 from time import sleep
 
+import requests
+
 from hmdooris.ccujack import CCUJack
 from hmdooris.websocketcomm import WebSocketClients
 
 
 class UpdatePoller:
-    def __init__(self, wsc: WebSocketClients, ccu: CCUJack, update_delay = 1.0):
+    def __init__(self, wsc: WebSocketClients, ccu: CCUJack,
+                 update_delay = 1.0,
+                 spaceapid_open_name=None,
+                 spaceapid_open_url=None):
         self.wsc = wsc
         self.ccu = ccu
         self.current = {}
         self.update_delay = update_delay
+        self.spaceapid_open_name = spaceapid_open_name
+        self.spaceapid_open_url = spaceapid_open_url
         self.log = logging.getLogger(__name__)
         Thread(target=self.run, daemon=True).start()
 
@@ -33,6 +40,7 @@ class UpdatePoller:
         for lock_id, value in new.items():
             if force or lock_id not in self.current or self.current[lock_id] != value:
                 update.append(value)
+                self.spaceapid_open_update(value)
         data = {
             "locks": update,
         }
@@ -42,3 +50,8 @@ class UpdatePoller:
 
     def send_locks(self, force=False):
         self.wsc.send(self.get_locks())
+
+    def spaceapid_open_update(self, lock):
+        if self.spaceapid_open_name is None:
+            return
+        requests.put(self.spaceapid_open_url, data=lock["status"]=="UNLOCKED")