Douyin Creator benchmark API

Please help me write a data collection script with the EveryInfra Douyin Creator benchmark endpoint (douyin/creator_benchmark).

Endpoint contract:
- Request: POST https://api.everyinfra.com/api/v1/social with the header Authorization: Bearer <API key>. Read the key from the EVERYINFRA_API_KEY environment variable and never hard-code it.
- In the request body, set platform to douyin and action to creator_benchmark, and put the parameters inside params.
- Required parameters:
  - user_id: The Douyin creator's secUid, usually beginning with MS4w, used to read the available account averages and percentiles. It is not a nickname or short numerical Douyin ID.
- Returns one object. Main fields: user_id, average_post_count, average_comment_count, average_share_count, average_follower_growth, average_like_count, post_count_percentile, comment_count_percentile, share_count_percentile, follower_growth_percentile, like_count_percentile.
- Example request body:
{
  "platform": "douyin",
  "action": "creator_benchmark",
  "params": {
    "user_id": "https://www.douyin.com/user/MS4wLjABAAAAk1tZ-L085zZf2yW_H5dnVFZWyk8Rt8v4RAvf9KhTyPoVdMDxTs7Q_rvgTJGWXezS"
  }
}
- Price: $0.56 per 1,000 requests; failed and empty results are not charged.
- For dozens or hundreds of targets, add "mode": "async" to the body: you get a job_id at once and poll GET https://api.everyinfra.com/api/v1/jobs/{job_id} for the result.
- On 422, fix the request using the suggested parameter names and allowed values in the error; on 429 or 503, wait for Retry-After and try again.

Before writing code, ask me which targets I need, how many, which fields, and what output format I want; then confirm the plan and the rough cost with me.