curl --request GET \
  --url https://demo-futures.kraken.com/derivatives/api/v3/rfqs/open-rfqs \
  --header 'APIKey: <api-key>' \
  --header 'Authent: <api-key>'

{
  "result": "success",
  "serverTime": "2023-11-07T05:31:56Z",
  "rfqs": [
    {
      "uid": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "expiry": "2023-11-07T05:31:56Z",
      "markPrice": 123,
      "legs": [
        {
          "symbol": "<string>",
          "size": 123,
          "markPrice": 123
        }
      ],
      "bestBid": 123,
      "bestAsk": 123,
      "bidSide": [
        {
          "tradeable": "<string>",
          "price": 123
        }
      ],
      "askSide": [
        {
          "tradeable": "<string>",
          "price": 123
        }
      ]
    }
  ]
}