G2 Alternatives API

Please help me write a data collection script with the EveryInfra G2 Alternatives endpoint (g2/alternatives).

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 g2 and action to alternatives, and put the parameters inside params.
- Required parameters:
  - url: Specifies the target G2 resource URL or bare slug. For profile, reviews, and alternatives, pass a /products/<slug> URL or product slug; for vendor, pass a /sellers/<slug> URL or seller slug.
- Optional parameters:
  - limit: The most rows to return in this call, an integer from 1 to 30. The default applies when you leave it out, and a call can return fewer rows. Larger values return 422 before any charge. (default: 10)
- Returns a list of records. Main fields of each record: name, slug, url, description, vendor_name, rating, rating_scale, rating_out_of_ten, review_count, entry_level_price, rank, source_product_slug; 13 fields in total, full list at https://api.everyinfra.com/api/v1/social/catalog?platform=g2.
- Example request body:
{
  "platform": "g2",
  "action": "alternatives",
  "params": {
    "url": "https://www.g2.com/products/slack/reviews"
  }
}
- Price: $1.39 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.