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httpstatus.io is actually a good tool that I've been using for over 3 years now so I think it isn't that domain that got acquired?

Yeah I did some mild research and the domain I'm thinking of was httpstatuses.com which was acquired by WebFX and turned useless. jkulton revived it at https://httpstatuses.io/ which they document in their blog https://jkulton.com/2022/reviving-httpstatuses/