curl --request POST \
  --url https://partners-api.sandbox.securitize.io/stocks/v1/stocks/off-ramp/{contractAddress}/prepare-execute-transaction \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "investorId": "6b31c0e9a4f2d17e85c3b904",
  "signedPrice": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzeW1ib2wiOiJBQVBML1VTRCJ9.c2lnbmF0dXJl",
  "slippageBps": "50",
  "assetAmount": "2000000000",
  "minOutputAmount": "460127800"
}
'

const options = {
  method: 'POST',
  headers: {'x-api-key': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    investorId: '6b31c0e9a4f2d17e85c3b904',
    signedPrice: 'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzeW1ib2wiOiJBQVBML1VTRCJ9.c2lnbmF0dXJl',
    slippageBps: '50',
    assetAmount: '2000000000',
    minOutputAmount: '460127800'
  })
};

fetch('https://partners-api.sandbox.securitize.io/stocks/v1/stocks/off-ramp/{contractAddress}/prepare-execute-transaction', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://partners-api.sandbox.securitize.io/stocks/v1/stocks/off-ramp/{contractAddress}/prepare-execute-transaction"

payload = {
    "investorId": "6b31c0e9a4f2d17e85c3b904",
    "signedPrice": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzeW1ib2wiOiJBQVBML1VTRCJ9.c2lnbmF0dXJl",
    "slippageBps": "50",
    "assetAmount": "2000000000",
    "minOutputAmount": "460127800"
}
headers = {
    "x-api-key": "<api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

{
  "unsignedTransaction": "AQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA…",
  "additionalData": {
    "anchorPrice": "231250000000000000000",
    "operator": "Gp3ratorRoutr9sXcR8yLmB3hW9sJdE6aK1uNqG5tYpC"
  }
}

{
  "statusCode": 400,
  "message": "EXPIRED_PRICE",
  "error": "Bad Request"
}

{
  "message": "No API key found in request"
}

{
  "statusCode": 403,
  "message": "UNAUTHORIZED_INVESTOR",
  "error": "Forbidden"
}

{
  "statusCode": 404,
  "message": "SYMBOL_NOT_FOUND",
  "error": "Not Found"
}

{
  "statusCode": 429,
  "message": "ThrottlerException: Too Many Requests"
}