CloudFlare started as a DNS-as-a-Service company and quickly expanded to other areas of networking. They main selling point is their top notch free DDoS protection. Their free offering includes everything you need to make your site more secure & faster. They offer a wide range of products from caching to firewall rules to cloud workers (similar to AWS Lambda or Azure Functions).

All of their self-serve pricing is transparent on the site, but in conversations recently with Enterprise account manager (Sales), figured worth adding that their minimum Enterprise account seems to start in the $2,000-$3,000 range.

Note: this is a negotiated, stripped-down Enterprise offering primarily for inclusion of SSL for SaaS and custom Workers CPU limit increase requirements.