Websites that have a shopping cart or checkout page, either using a known ecommerce platform or a custom solution.
Google Cloud Trace is a distributed tracing system that collects latency data from applications and displays it in the Google Cloud Console.
JSDelivr is a free public CDN for open-source projects. It can serve web files directly from the npm registry and GitHub repositories without any configuration.
Stripe offers online payment processing for internet businesses as well as fraud prevention, invoicing and subscription management.
Unpkg is a content delivery network for everything on npm.