> 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/usehaspermit.md).

# useHasPermit

Query hook that checks whether stored permits cover the requested contract addresses.

Returns `true` if decrypt operations can proceed without a wallet prompt. Returns `false` when no permits exist or the `permitTTL` has expired.

## Import

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

## Usage

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

```tsx
import { useHasPermit, useGrantPermit } from "@zama-fhe/react-sdk";

const CONTRACTS = ["0xTokenA", "0xTokenB"] as const;

function AuthGuard() {
  const { data: hasPermit, isLoading } = useHasPermit({ contractAddresses: [...CONTRACTS] });
  const { mutateAsync: grantPermit } = useGrantPermit();

  if (isLoading) return <span>Checking permits...</span>;

  if (!hasPermit) {
    return <button onClick={() => grantPermit([...CONTRACTS])}>Authorize wallet</button>;
  }

  return <span>Permits active — decrypts will not prompt the wallet</span>;
}
```

{% endtab %}

{% tab title="Gated decrypt" %}

```tsx
import { useHasPermit, useGrantPermit, useDecryptValues } from "@zama-fhe/react-sdk";

function GatedDecrypt({
  encryptedValue,
  contractAddress,
}: {
  encryptedValue: string;
  contractAddress: `0x${string}`;
}) {
  const { data: hasPermit } = useHasPermit({ contractAddresses: [contractAddress] });
  const { mutateAsync: grantPermit } = useGrantPermit();
  const { data, isPending } = useDecryptValues(
    [{ encryptedValue, contractAddress }],
    { enabled: !!hasPermit }, // only decrypt once authorized
  );

  if (!hasPermit) {
    return <button onClick={() => grantPermit([contractAddress])}>Authorize</button>;
  }

  if (isPending) return <span>Decrypting...</span>;
  return <output>{data?.[encryptedValue]?.toString()}</output>;
}
```

{% endtab %}
{% endtabs %}

## Parameters

### contractAddresses

`Address[]` — **required**

Contract addresses to check credentials against. Returns `true` only when stored permits cover **all** specified addresses.

```tsx
const { data: hasPermit } = useHasPermit({ contractAddresses: ["0xContractA", "0xContractB"] });
```

An empty list is a no-op: the query is disabled and `data` stays `undefined`, so you can call the hook unconditionally even when there is nothing to check yet.

## options

`Omit<UseQueryOptions<boolean>, "queryKey" | "queryFn">` — **optional**

Standard React Query options forwarded to the underlying query. Pass `{ enabled: false }` to mount the hook in an idle state (no work, no signature while disabled).

{% hint style="warning" %}
**You must gate decrypt queries yourself.** `useDecryptValues` does not automatically wait for permits — if you call it before `useGrantPermit`, the user sees an unexpected wallet popup. Use `useHasPermit` to conditionally enable the decrypt query via `{ enabled: !!hasPermit }` as the second argument, or conditionally render the decrypt component only when `hasPermit` is `true`.
{% endhint %}

## Return Type

```ts
// Returns UseQueryResult<boolean, Error>
```

`data` is a `boolean`:

* `true` -- stored permits cover all specified addresses; decrypts will not prompt the wallet.
* `false` -- no stored permits, or the `permitTTL` has expired. Call [`useGrantPermit`](/protocol/sdk/api-references/react/usegrantpermit.md) to authorize.

## Related

* [Avoid blind-sign wallet popups](/protocol/sdk/guides/encrypt-decrypt.md#gating-useconfidentialbalance) -- gating balance queries to avoid blind-sign popups
* [`useGrantPermit`](/protocol/sdk/api-references/react/usegrantpermit.md) -- pre-authorize contracts with one wallet signature
* [`useRevokePermits`](/protocol/sdk/api-references/react/userevokepermits.md) -- revoke permits
* [Permit Model](/protocol/sdk/concepts/permit-model.md) -- permit lifecycle and TTL configuration


---

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