> ## Documentation Index
> Fetch the complete documentation index at: https://docs.qu.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# isQuaiAddress

```ts theme={null}
function isQuaiAddress(address): boolean
```

Checks whether a given address is in the Quai ledger scope by checking the 9th bit of the address.

## Parameters

| Parameter | Type     | Description          |
| :-------- | :------- | :------------------- |
| `address` | `string` | The address to check |

## Returns

`boolean`

True if the address is in the Quai ledger scope, false otherwise.

## Source

[address/checks.ts:141](https://github.com/dominant-strategies/quais.js/blob/c1c12d43f9d34c6baad2b0542bd6d0acd6fefcbf/src/address/checks.ts#L141)