Ask HN: Siteuptime.com but running my JavaScript every 5 mins?

Don't know about saas, but it would seem like you could set this up on AWS lambda, or an Azure function.

Alternatively, you could write a webpage on your site that does what you need (server-side), and point Uptime Robot at that.

With Google Spreadsheets you can run js code periodically, including making http calls.

We're currently building one. If you'd like, you can send us some ideas to be implemented at support at gentlent dot com :)

Can trigger a lambda every 5 minutes.

try http://www.uptimedoctor.com, I'm using that for my heroku project.

Try Runscope.com with Ghost Inspector.