Kitty,

@o76923 as much as I can tell, emojos.in just uses the mastodon-standard endpoint for emoji for literally anything:
void.rehab would be https://void.rehab/api/v1/custom_emojis

code from emojos.in src:

    let mut url = Url::from_str("https://host.invalid/api/v1/custom_emojis").unwrap();
    if url.set_host(Some(&instance)).is_err() {
        return Err(InstanceError::from_kind(Kind::NotFound, instance));
    }
...
            Kind::NotFound => {
                "Not a fediverse instance, or does not support the Mastodon custom emoji API"
            }
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