Kalshi Markets API

Please help me write a data collection script with the EveryInfra Kalshi Markets endpoint (kalshi/markets).

How the endpoint works:
- 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 kalshi and action to markets, and put the parameters inside params.
- No required parameters.
- Optional parameters:
  - event_ticker: Only markets of one Kalshi event, such as KXBTC2026200-27JAN01, taken from the event_ticker of a row.
  - keyword: Words to find in market titles, at least 3 characters, such as bitcoin or fed; leave it out to list markets by the chosen order.
  - sort: volume (default, contracts traded), open_interest, price_desc, price_asc or close_time. (allowed: close_time / open_interest / price_asc / price_desc / volume)
  - status: open (default, still trading) or closed (finished or settled). (allowed: closed / open)
  - limit: The most rows to return in this call, an integer from 1 to 100. The default applies when you leave it out, and a call can return fewer rows. Larger values return 422 before any charge. (default: 20)
- Returns a list of records. Main fields of each record: ticker (Market ticker, as Kalshi writes it), event_ticker (Ticker of the parent event), series_ticker (Ticker of the parent series), title, event_title (Title of the parent event), yes_subtitle (Description of the Yes side, such as Ab…), no_subtitle (Description of the No side), status (Market status as Kalshi reports it, suc…), result (Settlement result, yes or no), last_price (Last traded price in dollars (0 to 1), yes_bid (Current Yes bid, dollars), yes_ask (Current Yes ask, dollars); 27 fields in total, full list at https://api.everyinfra.com/api/v1/social/catalog?platform=kalshi.
- Example request body:
{
  "platform": "kalshi",
  "action": "markets",
  "params": {}
}
- Price: $6.81 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.