By default, images from any origin domains can be resized by Cloudimage and the storage and traffic consumption generated by the images will count toward your plan's allowance. In the Cloudimage admin console, you can restrict the list of origin URLs that your token can transform images from.
Log in to your Cloudimage admin console and navigate to Image settings / scroll down to Whitelisted domains: Configure your original image domains / S3 buckets.
This Cloudimage URL works:
This one does not: