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

# isReadOnly

> Check whether an Ostium client was created in read-only mode.

```ts theme={null}
const readOnly = client.isReadOnly();
```

Returns `true` for clients created with `createReadOnly()`.

## Response schema

```ts theme={null}
type Response = boolean;
```