you can't get much better than njump. as @fiatjaf would say, it's a service that should not exist. it takes lots of caching and selflessly serving, unless you sellout and add adverts for something lame like nordvpn 😂
Discussion
I think it is the opposite. It's the main service on Nostr. It's the main way to onboard new users (by sharing links to Nostr content) and letting them pick a client to load it. It should only show a preview of the content (Opengraph style) and then point to an app/site that can actually open it.
Não sei qual a sua intenção, Vitor, mas o nosta.me faz essa função também, embora eu o ache bastante infantil no tema lúdico e bem menos rico nas opções de clients para o usuário visualizar o perfil que deseja. Nada profissional, pra dizer a verdade.