Subdomains on mcmod.xyz will redirect to the corresponding project on Modrinth. For example, traverse.mcmod.xyz will take you to https://modrinth.com/project/traverse.
Since Modrinth slugs are unique, you can use this domain as a stable namespace if you'd like, such as xyz.mcmod.traverse.
https://modrinth.com/mod/slug to https://modrinth.com/project/slug