curl --request POST \
  --url https://api.custody.api-zodia.io/v3/api/custody/currencies/fees \
  --header 'X-Signature: <api-key>' \
  --header 'submitter-id: <submitter-id>'

{
  "items": [
    {
      "high": {
        "value": [
          "9357300",
          "3119100",
          "1576767"
        ]
      },
      "medium": {
        "value": [
          "9357300",
          "3119100",
          "1576767"
        ]
      },
      "low": {
        "value": [
          "9357300",
          "3119100",
          "1576767"
        ]
      },
      "type": "<string>",
      "weight": "BTC: satoshiPerVbyte (e.g. 3995), ETH: Gwei (e.g. 21000)",
      "currencyId": "eth-Seth, btc-btc"
    }
  ]
}