curl --request POST \
  --url https://futures.kraken.com/derivatives/api/v3/cancelallorders \
  --header 'APIKey: <api-key>' \
  --header 'Authent: <api-key>'

{
  "result": "success",
  "cancelStatus": {
    "receivedTime": "2019-08-01T15:57:37.518Z",
    "cancelOnly": "all",
    "status": "cancelled",
    "cancelledOrders": [
      {
        "order_id": "6180adfa-e4b1-4a52-adac-ea5417620dbd"
      },
      {
        "order_id": "89e3edbe-d739-4c52-b866-6f5a8407ff6e"
      },
      {
        "order_id": "0cd37a77-1644-4960-a7fb-9a1f6e0e46f7"
      }
    ],
    "orderEvents": [
      {
        "type": "CANCEL",
        "uid": "89e3edbe-d739-4c52-b866-6f5a8407ff6e",
        "order": {
          "orderId": "89e3edbe-d739-4c52-b866-6f5a8407ff6e",
          "type": "post",
          "symbol": "PF_XBTUSD",
          "side": "buy",
          "quantity": 890,
          "filled": 0,
          "limitPrice": 10040,
          "reduceOnly": false,
          "timestamp": "2019-08-01T15:57:08.508Z",
          "lastUpdateTimestamp": "2019-08-01T15:57:08.508Z"
        }
      },
      {
        "type": "CANCEL",
        "uid": "0cd37a77-1644-4960-a7fb-9a1f6e0e46f7",
        "order": {
          "orderId": "0cd37a77-1644-4960-a7fb-9a1f6e0e46f7",
          "type": "lmt",
          "symbol": "PF_XBTUSD",
          "side": "sell",
          "quantity": 900,
          "filled": 0,
          "limitPrice": 10145,
          "reduceOnly": true,
          "timestamp": "2019-08-01T15:57:14.003Z",
          "lastUpdateTimestamp": "2019-08-01T15:57:14.003Z"
        }
      }
    ]
  },
  "serverTime": "2019-08-01T15:57:37.520Z"
}