changedetection.io

changedetection.io watches web pages for changes: prices, stock, announcements. Its notification URLs can post Pocketbell’s own request, with a button that opens the page.

This uses an API Source.

Set it up

1. In the Pocketbell app, create a Source named changedetection.io, choose API, and copy its key.

2. In changedetection.io, open Settings → Notifications, and add this notification URL, with your key in place of pb_live_…:

   posts://api.pocketbell.dev/v1/messages?+Authorization=Bearer%20pb_live_…

   The %20 is the space after Bearer.

3. Set the Notification Body to:

   {
     "title": {{ watch_title|tojson }},
     "message": {{ ("Changed: " ~ watch_url)|tojson }},
     "url": {{ watch_url|tojson }},
     "url_title": "Open page",
     "tags": ["changedetection"]
   }

4. Click Send test notification, then save. The same can be set on a single watch instead, under its Notifications tab.

How it behaves

• |tojson turns each value into a JSON string, quotes included, so a page title with quotes in it still makes a valid request.
• A message over 4,096 characters is refused, and nothing arrives, so keep the message short, as above, and open the page to see what changed.
• The +Authorization header needs changedetection.io 0.45.8.2 or later.