BareMetrics - SaaS Analytics for Stripe
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.
SlipMetrics - Slipmetrics provide one-click Sales Analytics & Insights for Paypal.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Probe - Revenue metrics. Sales metrics. Business costs. All in one place.
Better Uptime - We call you when your website goes down