curl --request POST \
  --url https://openplatform.gateapi.io/withdraw/open/otc/api/v1/quote \
  --header 'Content-Type: application/json' \
  --header 'X-GatePay-Certificate-ClientId: <x-gatepay-certificate-clientid>' \
  --header 'X-GatePay-Nonce: <x-gatepay-nonce>' \
  --header 'X-GatePay-Signature: <x-gatepay-signature>' \
  --header 'X-GatePay-Timestamp: <x-gatepay-timestamp>' \
  --data '
{
  "cryptoCurrency": "USDT",
  "fiatCurrency": "USD",
  "side": "FIAT",
  "type": "BUY"
}
'

{
  "code": "0",
  "status": "success",
  "errorMessage": "",
  "data": {
    "quoteToken": "qt_01JXYZABCDEF",
    "validPeriod": 60,
    "cryptoAmount": "1088.42",
    "fiatAmount": "1000",
    "fiatRate": "0.918762",
    "cryptoRate": "1.088420"
  }
}