/rest/default/V1/guest-carts/ DDOS attack

Overnight I am getting thousands of calls per minute to /rest/default/V1/guest-carts/

I have placed a recaptcha on checkout, and Cloudflare but still no luck.

I can see other people have this issue- https://community.magento.com/t5/Magento-2-x-Technical-Issues/rest-default-V1-guest-carts-open-to-DDOS/m-p/421447#M12873

But I have never seen it solved. Any ideas?

submitted by /u/tylerr82
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