List the user's trained models with pre-computed train/test stats

Your API key, if you cannot set the X-API-Key header. Agents that mint a key at runtime (e.g. a ChatGPT Action calling POST /api/v1/key/trial) should pass the returned api_key here on every subsequent call. The X-API-Key header wins when both are present. Prefer the header where you can set one: query strings are recorded in server access logs.