> For the complete documentation index, see [llms.txt](https://docs.zama.org/protocol/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.zama.org/protocol/sdk/api-references/react/usewrapperdiscovery.md).

# useWrapperDiscovery

Find the confidential wrapper contract address for an ERC-20 token via the on-chain registry. The result is cached indefinitely since wrapper addresses never change.

## Import

```ts
import { useWrapperDiscovery } from "@zama-fhe/react-sdk";
```

## Usage

{% tabs %}
{% tab title="WrapperInfo.tsx" %}

```tsx
import { useWrapperDiscovery } from "@zama-fhe/react-sdk";

function WrapperInfo({ tokenAddress }: { tokenAddress: `0x${string}` }) {
  const {
    data: wrapperAddress,
    isLoading,
    error,
  } = useWrapperDiscovery({ tokenAddress, erc20Address: "0xUSDC" });

  if (isLoading) return <p>Discovering wrapper...</p>;
  if (error) return <p>Error: {error.message}</p>;

  return <p>Wrapper: {wrapperAddress}</p>;
}
```

{% endtab %}
{% endtabs %}

## Parameters

### tokenAddress

`Address`

Address of any confidential token you control. Used to scope the query cache key and to gate whether the query is enabled — it does not affect which wrapper the registry returns.

### erc20Address

`Address | undefined`

Address of the ERC-20 token to discover the wrapper for. Pass `undefined` to disable the query.

```ts
useWrapperDiscovery({ tokenAddress: "0xConfidentialToken", erc20Address: "0xUSDC" });
```

## Return Type

The `data` field resolves to `Address | null` -- the wrapper contract address for the given token, or `null` if no wrapper exists.

## Caching

The query uses `staleTime: Infinity`. Wrapper addresses are immutable once deployed, so the result never re-fetches automatically.

## Suspense

Use `useWrapperDiscoverySuspense` inside a `<Suspense>` boundary to avoid manual loading state handling:

```tsx
import { useWrapperDiscoverySuspense } from "@zama-fhe/react-sdk";

function WrapperInfo({ tokenAddress }: { tokenAddress: `0x${string}` }) {
  const { data: wrapperAddress } = useWrapperDiscoverySuspense({
    tokenAddress,
    erc20Address: "0xUSDC",
  });

  return <p>Wrapper: {wrapperAddress}</p>;
}
```

## Related

* [useMetadata](/protocol/sdk/api-references/react/usemetadata.md) -- read token name, symbol, and decimals
* [Hooks overview](/protocol/sdk/api-references/react/query-keys.md) -- all available hooks


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