curl --request POST \
  --url https://mainnet.gomaestro-api.org/v1/contracts/singleAssetStaking/updateStake \
  --header 'Content-Type: application/json' \
  --header 'api-key: <api-key>' \
  --data '
{
  "configTN": "<string>",
  "sender": "<string>",
  "toStake": 123,
  "nodeUTxOs": [
    {
      "txHash": "<string>",
      "outputIndex": 123,
      "address": "<string>",
      "assets": [
        {
          "policyId1assetName1": "123",
          "policyId2assetName2": "456",
          "policyId3assetName3": "789"
        }
      ],
      "datumHash": "<string>",
      "datum": "<string>",
      "scriptRef": "<string>"
    }
  ]
}
'

{
  "cbor_hex": "<string>",
  "tx_hash": "<string>"
}