curl --request GET \
  --url https://api.elections.kalshi.com/trade-api/v2/cached/events/{ticker}/forecast_history

{
  "forecast_history": [
    {
      "end_period_ts": 123,
      "event_ticker": "<string>",
      "percentile_points": [
        {
          "formatted_forecast": "<string>",
          "numerical_forecast": "<any>",
          "percentile": 123,
          "raw_numerical_forecast": "<any>"
        }
      ],
      "period_interval": 123
    }
  ]
}