curl --request POST \
  --url https://api-partner.houdiniswap.com/v2/exchanges/multi/{multiId}/tx/build \
  --header 'Authorization: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "sender": "<string>",
  "houdiniIds": [
    "<string>"
  ]
}
'

{
  "multiId": "<string>",
  "chain": "<string>",
  "transactions": [
    {
      "houdiniIds": [
        "<string>"
      ],
      "txData": {
        "userOpHash": "<string>",
        "to": "<string>",
        "data": "<string>",
        "value": "<string>",
        "chainId": 123,
        "tokenAmount": "<string>"
      }
    }
  ],
  "depositNeeded": "<string>",
  "saCurrentBalance": "<string>"
}