Looks up contact emails for one TikTok, Instagram or YouTube creator from a profile URL. Returns `platform` parsed from the URL, `username`, `profileLink`, `platformUserId`, `region`, a primary `email`, an `emails` array of every address found, and a `contacts` array of external links each shaped `{url, type}` (personal sites, WhatsApp links), plus `quota.cost` in credits and `quota.remainingQuota`. Measured at 533 bytes and about 2 seconds for one Instagram creator. `email` is null and `emails` empty when the creator publishes no address — a normal result, not an error. Handles one creator per call. To assemble a creator list first use `post_waveinflu_similar_creators`, which already returns an `email` for most matches; call this endpoint for the ones that come back null, and for Instagram creators, which the similar-creators endpoint does not cover.