> ## 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.

# checkUsdcAllowance

> Check whether the connected trader has enough USDC allowance for a required amount.

```ts theme={null}
const allowance = await client.checkUsdcAllowance('100');
```

## Returns

* `current`
* `required`
* `sufficient`

## Use when

* validating a trade before `openTrade()`
* validating a top-up before `updateCollateral()`

This helper uses the connected trader address and is not for read-only clients.

## Response schema

```ts theme={null}
interface Response {
  current: bigint;
  required: bigint;
  sufficient: boolean;
}
```