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"
}
'

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