I am using FastComet web hosting for my website, already tested Uptime Robot for monitoring uptime of my server. But as a free user, they offer only 5 minutes interval for each check.

Is there any way or free service to track server accessibility with 1-minute interval?

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Thanks,

You can write a crude crontab script that pulls a particular page from your server every minute and checks if it returns a particular string. No string returned will mean server down.

There are various kind of services provided over internet as nowadays. You can just simple search on google for the services. Just contact to them and have their services.