curl --request POST \
  --url https://api.machines.cash/partner/v1/withdrawals/estimate \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "destination": {
    "currency": "hbar",
    "network": "hbar",
    "extraId": "<string>"
  },
  "amountCents": 2
}
'

{
  "ok": true,
  "data": {
    "estimate": {
      "fromCurrency": "<string>",
      "fromNetwork": "<string>",
      "toCurrency": "<string>",
      "toNetwork": "<string>",
      "minAmount": 123,
      "maxAmount": 123,
      "minAmountCents": 123,
      "maxAmountCents": 123,
      "destinationSupportsExtraId": true,
      "fromAmount": 123,
      "fromAmountCents": 123,
      "estimatedToAmount": 123,
      "rateId": "<string>",
      "destinationExtraId": "<string>"
    }
  },
  "summary": "<string>",
  "errors": [
    {
      "code": "invalid_request",
      "message": "missing required field",
      "field": "<string>"
    }
  ],
  "next": {
    "pollAfterMs": 1,
    "suggestedTool": "<string>",
    "suggestedArgs": {}
  }
}