Page changed → your phone knows
changedetection.io ships Apprise with its own
posts:// handler, so pingwa is one notification URL away. Restock,
price, terms-page watching with the diff delivered to WhatsApp. Text
join to get a key.
The notification
Per watch (or in global settings) → Notifications:
Notification URL:
posts://pingwa.dev/v1/notify?+Authorization=Bearer%20pw_YOUR_KEY
Notification Title: (leave empty)
Notification Body:
{"text": {{ ("Changed: " ~ watch_url ~ "\n\n" ~ diff) | truncate(900, true) | tojson }}}
Notification Format: Text
The +Authorization query param becomes the HTTP
header; tojson makes the diff JSON-safe;
truncate(900, true) keeps it under pingwa's 1024-char
text limit. Hit "Send test notification" to check the pipe.
Verified 2026-07-23 against the changedetection.io notification docs.
Noise control
Every changed check = one message, and out-of-window sends
are paid (free plan: 30/month). Tune per-watch recheck intervals, use the
visual selector to watch the price element instead of the whole page, and
keep jittery watches on a digest channel instead. 402 from
pingwa = quota spent.
Two-way, and DIY watchers
Want to act on the change (buy, book, reply)? Point
a tiny script at POST /v1/ask with buttons and approve from your
phone; the watchers recipe has the full loop,
including the buy-it-now variant.
FAQ
Why posts:// and not json://?
changedetection.io's own handler: it converts +Header
params to headers, posts your body verbatim as JSON, and carries the
project's SSRF guard. For any other Apprise-embedded tool, use the generic
jsons:// recipe.
The diff has HTML junk in it.
Switch the watch's "difference" mode to text, or replace
diff with current_snapshot in the body. The same
tojson rule applies.
Scan the code and get instant access. It opens WhatsApp with “join” ready to send, and your API key comes straight back.
pingwa carries the ping over the official Meta Cloud API. Your own number stays out of it (why that matters). Alerts landing outside your 24h reply window are paid template sends; the free plan's 30/month covers a well-tended watch list.