Pingdom - With website monitoring from Pingdom you will be the first to know when your website is down. No installation required. 30-day free trial.
Unlock - Monetize your content with a few lines of code
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
HitPay - Send or receive money using a modern payments interface
Better Uptime - We call you when your website goes down
Kale - Kale helps nanoinfluencers (<10k followers) make a passive income.