curl --request POST \
  --url https://app.alphapo.net/api/v2/currencies/rates \
  --header 'Content-Type: application/json' \
  --header 'X-processing-key: <api-key>' \
  --header 'X-processing-signature: <api-key>' \
  --data '
{
  "currency_from": "BTC",
  "currency_to": "EUR"
}
'

{
  "data": [
    {
      "currency_from": {
        "currency": "BTC",
        "type": "crypto",
        "min_amount": "0.00010000",
        "description": "Filter by currency ISO that exchanges from.",
        "min_amount_deposit_with_exchange": "0.00010000"
      },
      "currency_to": {
        "currency": "EUR",
        "type": "fiat",
        "description": "Filter by currency ISO that can be converted to."
      },
      "rate_from": "1",
      "rate_to": "20693.84879354"
    }
  ]
}