curl --request POST \
  --url https://api.kamino.finance/ktx/kvault/withdraw-instructions \
  --header 'Content-Type: application/json' \
  --data '
{
  "wallet": "KUMtRazMP7vwvc2kthnGZ9Cq6ZsGRiYC97snMYepNx9",
  "kvault": "HDsayqAsDWy3QvANGqh2yNraqcD8Fnjgh73Mhb3WRS5E",
  "amount": "0.1234"
}
'

const options = {
  method: 'POST',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({
    wallet: 'KUMtRazMP7vwvc2kthnGZ9Cq6ZsGRiYC97snMYepNx9',
    kvault: 'HDsayqAsDWy3QvANGqh2yNraqcD8Fnjgh73Mhb3WRS5E',
    amount: '0.1234'
  })
};

fetch('https://api.kamino.finance/ktx/kvault/withdraw-instructions', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://api.kamino.finance/ktx/kvault/withdraw-instructions"

payload = {
    "wallet": "KUMtRazMP7vwvc2kthnGZ9Cq6ZsGRiYC97snMYepNx9",
    "kvault": "HDsayqAsDWy3QvANGqh2yNraqcD8Fnjgh73Mhb3WRS5E",
    "amount": "0.1234"
}
headers = {"Content-Type": "application/json"}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

false

{
  "instructions": [
    {
      "accounts": [
        {
          "address": "9y7uLMUMW6EiRwH1aJFSp9Zka7dVx2JdZKA3858u6YHT",
          "role": "WRITABLE_SIGNER",
          "signer": {
            "address": "9y7uLMUMW6EiRwH1aJFSp9Zka7dVx2JdZKA3858u6YHT"
          }
        }
      ],
      "data": "8iPGiVLh8rYA4fUFAAAAAA==",
      "programAddress": "KvauGMspG5k6rtzrqqn7WNn3oZdyKqLKwK2XWQ8FLjd"
    }
  ],
  "lutsByAddress": {
    "9p2oT9J6BojHigd3V5qXzrwsQf4dtgMgLxtrzLVR3rwu": [
      "sadmBTQm5HJsyzWHEjV4YwG9CiahZKVDVqAyS4Wx1zH",
      "HDsayqAsDWy3QvANGqh2yNraqcD8Fnjgh73Mhb3WRS5E",
      "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v"
    ]
  }
}

{
  "statusCode": 400,
  "message": "<string>",
  "error": "Bad Request",
  "code": "DECIMAL_TO_LAMPORTS_OVERFLOW"
}