Added to the site
PingWhen is live at pingwhen.app — paste a URL, get pinged when it changes or dies. Starter $9/mo and Plus $19/mo on Stripe.
PingWhen
Watch a page and get an email when it changes or goes down. Built on Cloudflare Workers with Stripe billing and Resend email. Starter is $9/mo (10 watches, every 15 min); Plus is $19/mo (40 watches, every 5 min).