Scan the code below with Knockbox and you have your own inbox. No sign-up, no password. After that, anything can send a notification to your phone — the laundry has finished, a parcel is downstairs, the thing you were watching dropped in price.
If Knockbox is already installed, this connects it directly
After you scan
1
A channel appears in the app, and this page hands you a send page of your own. Bookmark it.
2
That page has a worked example of every format, each with a Send this one button — press it and your phone really does buzz.
3
Give the address to anything that can make one HTTP request: home automation, a price watcher, a script you wrote, or your own coding agent.
There is no account or password. Your identity is the credential on the device. Lose every device and it is gone — to add a second device, generate a code from the app that is already connected.