xiaohongshu.user.profile — routed: best of 3 providers, own keys first

パラメータ

Send everything you know about the subject — treg derives the rest (full_name ⇄ first+last), matches each provider on the variants it accepts ({user_id}) and sends each provider only the fields it wants. On a miss treg keeps trying providers, cheapest first, within X-Treg-Route-Max-Cost (default $1 per call; misses on per-success providers are free). Options ride as headers, never in the body: X-Treg-Route-Waterfall: 0 (stop at the first miss), X-Treg-Route-Max-Cost: <usd>, X-Treg-Route-Prefer / X-Treg-Route-Exclude: <provider>. The response is {output, raw, _treg: {served_by, tried}}; X-Treg-Served-By names the child.