# erc20BalanceOf

Returns an ERC-20 token balance of a token and user managed by a wallet module.

## Usage

The following example creates an inspect request handler that assumes the `payload` is an user address and just prints the balance of that user to the console.

```ts twoslash
import { createApp } from "@deroll/app";
import { createWallet } from "@deroll/wallet";

// create app
const app = createApp();

// create wallet
const wallet = createWallet();

app.addAdvanceHandler(wallet.handler);

const token = "0x491604c0FDF08347Dd1fa4Ee062a822A5DD06B5D"; // CTSI address // [!code focus]
app.addInspectHandler(async ({ payload }) => { // [!code focus]
    const address = payload.toString(); // [!code focus]
    const balance = wallet.erc20BalanceOf(token, address); // [!code focus]
    console.log(balance); // [!code focus]
}); // [!code focus]
```

## Returns

Type: `bigint`

The ERC-20 balance of the given token and address.

## Parameters

Type: `string`

The address of the user to get the balance from.

Type: `string`

The address of the user to get the balance from.