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I think Fastly offers some similar products: https://www.fastly.com/edge-cloud-network/

But Cloudflare offers a lot of features/services. What specifically are you trying to find alternatives for?

Essentially we just need 1) edge cache to cache response from our website / api 2) and firewall rules

I love Verizon's Edgecast cache feature. It just works so well.

Fastly should be able to do both