Postman - The Collaboration Platform for API Development
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.
DreamFactory - DreamFactory is an API management platform used to generate, secure, document, and extend APIs.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
AWS CloudTrail - AWS CloudTrail is a web service that records AWS API calls for your account and delivers log files to you.
Better Uptime - We call you when your website goes down