curl --request POST \
  --url https://app.cryptoprocessing.com/api/v2/currencies/list \
  --header 'Content-Type: application/json' \
  --header 'X-processing-key: <api-key>' \
  --header 'X-processing-signature: <api-key>' \
  --data '
{
  "visible": true
}
'

{
  "data": [
    {
      "id": 1,
      "type": "crypto",
      "currency": "BTC",
      "minimum_amount": "0.00010000",
      "deposit_fee_percent": "0.000000",
      "withdrawal_fee_percent": "0.025000"
    }
  ]
}