sep20-lookup.js

const TOKEN_CONTRACT_ADDRESS="0xc70c7718C7f1CCd906534C2c4a76914173EC2c44"
const YOUR_ETH_ADDRESS="0x6cdde7dd0acc56cabfc2315791016f7c334d72c3"

// The minimum ABI to get SEP20 Token balance
const minABI = [
    {
    constant: true,
    inputs: [{ name: "_owner", type: "address" }],
    name: "balanceOf",
    outputs: [{ name: "balance", type: "uint256" }],
    type: "function",
    },
    {
    constant: true,
    inputs: [],
    name: "decimals",
    outputs: [{ name: "", type: "uint8" }],
    type: "function",
    },
];

// Get SEP20 Token contract instance
const contract = new web3js.eth.Contract(minABI, TOKEN_CONTRACT_ADDRESS)

// Call balanceOf function
const result = await contract.methods.balanceOf(YOUR_ETH_ADDRESS).call();
const format = Web3NoMeta.utils.fromWei(result);

console.log(format);