curl --request GET \
  --url https://api.roxom.com/v1/orderbook/snapshot \
  --header 'X-API-Key: <api-key>' \
  --header 'X-API-Signature: <api-key>'

{
  "data": {
    "buySellVersus": {
      "buy": "<string>",
      "sell": "<string>"
    },
    "buys": [
      {
        "price": "<string>",
        "size": "<string>",
        "total": "<string>"
      }
    ],
    "instrumentId": "<string>",
    "sells": [
      {
        "price": "<string>",
        "size": "<string>",
        "total": "<string>"
      }
    ]
  },
  "error": true
}