Origin is an origin server, but without the setup and configuration. Normally, you would have to bootstrap an EC2 instance, configure a web server to render a default response, and set up DNS records to point at your domain. With Origin, you press Install and you're done.
You can install it for free.
How to Install
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Origin is a lot easier to configure than a normal origin server. The installation page covers the basics but we'll cover more here.
Due to technical limitations with Cloudflare Workers, Origin will clobber any other Workers running on any routes on your domain.
The following Options is available for each static page:
Temporarily bypass Origin without uninstalling it.
OPTIONAL Origin Template
HTML template to render when requests are made to the root of your domain,
OPTIONAL 404 Not Found Template
HTML template to show if a route isn't found.