santerref

This plugin simplifies how you can add for you by giving you a configuration page to put the code.
Once installed, a new REST API route will be created to output the code: wp-json/mywebsiteisonline/v1/verify
Trusted by developers from all around the world.
<h4>My Website is Online features</h4>
Receive a notification as soon as a problem is detected on your website.
<ul>
<li>1-minute checks</li>
<li>Unlimited monitors</li>
<li>SMS alerts</li>
<li>Unlimited email alerts</li>
<li>HTTP headers and status</li>
<li>Response time monitoring (TTFB)</li>
<li>SSL certificate checks</li>
<li>Multi-factor authentication</li>
<li>12 months log retention</li>
<li>Multiple email recipients</li>
<li>Domain expiration monitoring</li>
<li>Google Web Risk</li>
<li>DNS records monitoring</li>
<li>Slack integration</li>
</ul>
To learn more about My Website is Online visit: <a href="https://mywebsiteisonline.com/" rel="nofollow ugc">https://mywebsiteisonline.com/</a>

Uptime Monitoring for WordPress – My Website is Online

Thanks for the plugin, help me linking my website to My Website is Online.

Simple and works perfectly

My Website is Online is a Web service that monitors your website every minute to check if it's down. Don’t let downtimes impact your business.

siteimpulse

Super Monitoring is an external web application for monitoring website uptime and its basic functions. 
This plugin integrates Super Monitoring interface into WordPress administration panel so you don’t have to log in to supermonitoring.com separately to see your reports or update settings.
Super Monitoring features 
– checking your website every minute 
– detecting different kinds of failures 
– using a worldwide network of monitoring stations to avoid false positives 
– measuring response times 
– content checking 
– web form testing 
– file integrity monitoring 
– instant email & mobile text (SMS) alerts 
– unlimited event history 
– API.
In order to use the plugin you need an account at <a href="https://www.supermonitoring.com/" title="website monitoring" rel="nofollow ugc">www.supermonitoring.com</a>. 
You can sign up for a free trial <a href="https://www.supermonitoring.com/sign-up" title="sign up for a free trial account" rel="nofollow ugc">here</a>.

Super Monitoring

Monitor your website uptime and basic functions with www.supermonitoring.com and access your reports and settings directly in your WordPress panel.

Uptime Monitoring for WordPress – My Website is Online vs Super Monitoring