curl --request GET \
  --url https://synthesis.trade/api/v1/kalshi/market/{series_id}/{kalshi_id}/price-history

{
  "success": true,
  "response": [
    {
      "yes_price": "0.58",
      "no_price": "0.42",
      "created_at": "2026-01-01T00:00:00"
    }
  ]
}