> ## 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.

# getSimSlippage

> Fetch simulated long and short slippage for Ostium pairs at different notionals.

```ts theme={null}
const slippage = await client.getSimSlippage({
  pairIds: [0, 1],
  ntls: ['10000', '100000'],
});
```

Use this for pre-trade execution previews.

## Response schema

```ts theme={null}
type Response = Record<string, {
  long: Array<{ ntl: string; slippage: string }>;
  short: Array<{ ntl: string; slippage: string }>;
}>;
```