What https service allows in a simple way (REST API) to determine if the site is available?

Question

Monitoring

This is either a simple csv/json response or html that can be easily parsed.

I used the downforeveryoneorjustme.com service, but one of his ips was blocked by Roskomnadzor. Now the chance to get access to it is 66%.

spoiler

Are there alternatives?

Answer 1

www.isitdownrightnow.com

Answer 2

Yandex projects will definitely not be blocked.
You can through them.
Either Webmaster or Metrics has the corresponding function, I set it up for a long time.

Answer 3

Add downforeveryoneorjustme.com to hosts with an entry pointing to the unblocked address.