In the past, one could use an IPv6 server through sixxs.net gateway. Now the service is gone.
However, I found there is a free Cloudflare gateway. I assume the IPv6 server is to be associated to a domain or subdomain through an AAAA record. I don't think this is possible otherwise.
However, Cloudflare docs are full of marketing hype and I don't actually understand if an IPv4-only client will be able to access IPv6-only servers through them (for ssh or for hosting a webserver).
Can you give me an answer, please?