import { GoldRushClient } from "@covalenthq/client-sdk";

const ApiServices = async () => {
    const client = new GoldRushClient("YOUR_API_KEY");
    const resp = await client.BalanceService.getNativeTokenBalance({chainName: "chainName", walletAddress: "walletAddress"});
    console.log(resp.data);
};

ApiServices();

{
  "address": "<string>",
  "updated_at": "2023-11-07T05:31:56Z",
  "quote_currency": "<string>",
  "chain_id": 123,
  "chain_name": "<string>",
  "items": [
    {
      "contract_decimals": 123,
      "contract_name": "<string>",
      "contract_ticker_symbol": "<string>",
      "contract_address": "<string>",
      "supports_erc": [
        "<string>"
      ],
      "logo_url": "<string>",
      "block_height": 123,
      "balance": "<string>",
      "quote_rate": 123,
      "quote": 123,
      "pretty_quote": "<string>"
    }
  ]
}