curl --request GET \
  --url 'https://openapi.msu.io/v1rc1/accounts/{walletAddress}/neso' \
  --header 'Content-Type: application/json' \
  --header 'x-nxopen-api-key: YOUR_API_KEY'

{
  "success": true,
  "data": {
    "offchainNeso": "0",
    "onchainNeso": "0"
  }
}