curl --request POST \
  --url https://api.unitedmarket.ai/markets/{id}/orders \
  --header 'Content-Type: application/json' \
  --data '
{
  "order": {
    "salt": "<string>",
    "maker": "<string>",
    "signer": "<string>",
    "taker": "0x0000000000000000000000000000000000000000",
    "tokenId": "<string>",
    "makerAmount": "<string>",
    "takerAmount": "<string>",
    "expiration": "0",
    "nonce": "<string>",
    "feeRateBps": "15",
    "signature": "<string>"
  },
  "orderType": "GTC"
}
'

const options = {
  method: 'POST',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({
    order: {
      salt: '<string>',
      maker: '<string>',
      signer: '<string>',
      taker: '0x0000000000000000000000000000000000000000',
      tokenId: '<string>',
      makerAmount: '<string>',
      takerAmount: '<string>',
      expiration: '0',
      nonce: '<string>',
      feeRateBps: '15',
      signature: '<string>'
    },
    orderType: 'GTC'
  })
};

fetch('https://api.unitedmarket.ai/markets/{id}/orders', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://api.unitedmarket.ai/markets/{id}/orders"

payload = {
    "order": {
        "salt": "<string>",
        "maker": "<string>",
        "signer": "<string>",
        "taker": "0x0000000000000000000000000000000000000000",
        "tokenId": "<string>",
        "makerAmount": "<string>",
        "takerAmount": "<string>",
        "expiration": "0",
        "nonce": "<string>",
        "feeRateBps": "15",
        "signature": "<string>"
    },
    "orderType": "GTC"
}
headers = {"Content-Type": "application/json"}

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

print(response.text)

{
  "orderHash": "<string>",
  "status": "<string>"
}

{
  "message": "<string>",
  "statusCode": 123
}