curl --request GET \
  --url http://localhost:3000/api/account/balance/{environment}/{index}/{accountId}

{
  "balance": "<string>",
  "mints": {},
  "tokens": [
    {
      "account": "<string>",
      "balance": "<string>",
      "decimals": "0",
      "mint": "<string>"
    }
  ]
}