curl --request GET \
  --url https://openapi.fcontext.com/api/market-data/market/trading_session \
  --header 'x-api-key: <api-key>'

{
  "sessions": [
    {
      "market": 123,
      "tradeSessions": [
        {
          "begTime": "<string>",
          "endTime": "<string>",
          "tradeSession": 123
        }
      ]
    }
  ]
}