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

# prepareDepositWithPermitTxData

> Prepare transaction data for a gasless permit-based deposit

Prepares transaction data for a deposit using an EIP-2612 permit signature. This enables single-transaction deposits without a separate approval step.

<Info>
  For most use cases, use the [unified deposit
  workflow](/v0.5.2/intro/products/earn/developers/api/deposit-workflow) which
  handles authorization automatically.
</Info>

## Import

```ts theme={null}
import { prepareDepositWithPermitTxData } from '@paxoslabs/amplify-sdk'
```

## Usage

```ts theme={null}
// First discover the vault
const [vault] = await getVaultsByConfig({
  yieldType: YieldType.CORE,
  chainId: 1,
  depositAssetAddress: '0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48',
})

const txData = await prepareDepositWithPermitTxData({
  vaultName: vault.name,
  depositAsset: '0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48',
  depositAmount: '1000',
  to: '0x...',
  chainId: 1,
  signature: '0x...', // From wallet signing
  deadline: 1234567890n,
})
```

## Parameters

| Parameter         | Type      | Required | Description                                                             |
| ----------------- | --------- | -------- | ----------------------------------------------------------------------- |
| `vaultName`       | `string`  | Yes      | Account name from `AmplifyVault.name` (e.g. from `getVaultsByConfig()`) |
| `depositAsset`    | `Address` | Yes      | Token contract address to deposit                                       |
| `depositAmount`   | `string`  | Yes      | Amount to deposit as decimal string (e.g., `"100.50"`)                  |
| `to`              | `Address` | Yes      | Recipient address for account shares                                    |
| `chainId`         | `number`  | Yes      | Blockchain network ID                                                   |
| `signature`       | `Hex`     | Yes      | Permit signature from wallet signing                                    |
| `deadline`        | `bigint`  | Yes      | Permit deadline (must match signed deadline)                            |
| `slippage`        | `number`  | No       | Slippage tolerance in basis points (default: 50)                        |
| `distributorCode` | `string`  | No       | Distributor code for fee attribution                                    |

```ts theme={null}
interface PrepareDepositWithPermitTxDataParams {
  /** Vault name (from AmplifyVault.name) */
  vaultName: string
  /** Token contract address to deposit */
  depositAsset: Address
  /** Amount to deposit as decimal string */
  depositAmount: string
  /** Recipient address for vault shares */
  to: Address
  /** Blockchain network ID */
  chainId: number
  /** Permit signature (hex string from wallet signing) */
  signature: Hex
  /** Permit deadline (must match signature deadline) */
  deadline: bigint
  /** Slippage in basis points (default: 50 = 0.5%) */
  slippage?: number
  /** Distributor code for fee attribution */
  distributorCode?: string
}
```

## Return Type

Returns a discriminated union based on account configuration, matching the same flat shape as `prepareDepositTxData()`.

<Tabs>
  <Tab title="Type Definition">
    ```ts theme={null}
    type DepositWithPermitData =
      | StandardDepositWithPermitData
      | KytDepositWithPermitData;

    interface StandardDepositWithPermitData {
      depositType: "standard";
      abi: Abi;
      address: Address;
      functionName: "depositWithPermit";
      args: readonly [Address, bigint, bigint, Address, Hex, bigint, number, Hex, Hex];
      chainId: number;
    }

    interface KytDepositWithPermitData {
      depositType: "kyt";
      abi: Abi;
      address: Address;
      functionName: "depositWithPermit";
      args: readonly [Address, bigint, bigint, Address, Hex, Attestation, bigint, number, Hex, Hex];
      chainId: number;
    }
    ```
  </Tab>

  <Tab title="Example Response">
    ```ts theme={null}
    {
      depositType: "standard",
      abi: [...], // DistributorCodeDepositorV0 ABI
      address: "0x1234...5678",
      functionName: "depositWithPermit",
      args: [
        "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48", // depositAsset
        1000000000n,    // depositAmount (in base units)
        995000000n,     // minimumMint (with slippage applied)
        "0xUser...Addr", // to (recipient)
        "0x",           // distributorCode (hex-encoded)
        1234567890n,    // deadline
        28,             // v
        "0xr...",       // r
        "0xs...",       // s
      ],
      chainId: 1,
    }
    ```
  </Tab>
</Tabs>

<Info>
  As of v0.5.2, the return structure is **flat** — `abi`, `functionName`, and `args` are top-level properties, matching `prepareDepositTxData()`. You can spread the result directly into `writeContract`.
</Info>

## Examples

<Tabs>
  <Tab title="Privy">
    ```tsx theme={null}
    import { encodeFunctionData } from "viem";
    import { usePrivy, useWallets } from "@privy-io/react-auth";
    import {
      getVaultsByConfig,
      prepareDepositAuthorization,
      prepareDepositWithPermitTxData,
      isPermitAuth,
      YieldType,
    } from "@paxoslabs/amplify-sdk";

    const { sendTransaction } = usePrivy();
    const { wallets } = useWallets();
    const wallet = wallets[0];
    const owner = wallet.address as `0x${string}`;

    const USDC = "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48" as const;

    // Discover vault first
    const [vault] = await getVaultsByConfig({
      yieldType: YieldType.CORE,
      chainId: 1,
      depositAssetAddress: USDC,
    });

    const params = {
      vaultName: vault.name,
      depositAsset: USDC,
      depositAmount: "1000",
      to: owner,
      chainId: 1,
    };

    // Step 1: Get permit data
    const auth = await prepareDepositAuthorization(params);

    if (isPermitAuth(auth)) {
      // Step 2: Sign the permit
      const provider = await wallet.getEthereumProvider();
      const signature = await provider.request({
        method: "eth_signTypedData_v4",
        params: [owner, JSON.stringify(auth.permitData)],
      }) as `0x${string}`;

      // Step 3: Execute deposit with permit
      const txData = await prepareDepositWithPermitTxData({
        ...params,
        signature,
        deadline: auth.permitData.message.deadline,
      });

      await sendTransaction({
        chainId: txData.chainId,
        to: txData.address,
        data: encodeFunctionData({
          abi: txData.abi,
          functionName: txData.functionName,
          args: txData.args,
        }),
      });
    }
    ```
  </Tab>

  <Tab title="Wagmi">
    ```tsx theme={null}
    import { useAccount, useWriteContract, useSignTypedData } from "wagmi";
    import {
      getVaultsByConfig,
      prepareDepositAuthorization,
      prepareDepositWithPermitTxData,
      isPermitAuth,
      YieldType,
    } from "@paxoslabs/amplify-sdk";

    const { address, chainId } = useAccount();
    const { writeContractAsync } = useWriteContract();
    const { signTypedDataAsync } = useSignTypedData();

    const USDC = "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48" as const;

    const [vault] = await getVaultsByConfig({
      yieldType: YieldType.CORE,
      chainId: chainId!,
      depositAssetAddress: USDC,
    });

    const params = {
      vaultName: vault.name,
      depositAsset: USDC,
      depositAmount: "1000",
      to: address!,
      chainId: chainId!,
    };

    const auth = await prepareDepositAuthorization(params);

    if (isPermitAuth(auth)) {
      const signature = await signTypedDataAsync(auth.permitData);

      const txData = await prepareDepositWithPermitTxData({
        ...params,
        signature,
        deadline: auth.permitData.message.deadline,
      });

      await writeContractAsync({
        address: txData.address,
        abi: txData.abi,
        functionName: txData.functionName,
        args: txData.args,
        account: address,
      });
    }
    ```
  </Tab>

  <Tab title="Viem">
    ```ts theme={null}
    import { createWalletClient, custom } from "viem";
    import { mainnet } from "viem/chains";
    import {
      getVaultsByConfig,
      prepareDepositAuthorization,
      prepareDepositWithPermitTxData,
      isPermitAuth,
      YieldType,
    } from "@paxoslabs/amplify-sdk";

    const client = createWalletClient({
      account,
      chain: mainnet,
      transport: custom(window.ethereum),
    });

    const USDC = "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48" as const;

    const [vault] = await getVaultsByConfig({
      yieldType: YieldType.CORE,
      chainId: mainnet.id,
      depositAssetAddress: USDC,
    });

    const params = {
      vaultName: vault.name,
      depositAsset: USDC,
      depositAmount: "1000",
      to: account,
      chainId: mainnet.id,
    };

    const auth = await prepareDepositAuthorization(params);

    if (isPermitAuth(auth)) {
      const signature = await client.signTypedData({
        account,
        ...auth.permitData,
      });

      const txData = await prepareDepositWithPermitTxData({
        ...params,
        signature,
        deadline: auth.permitData.message.deadline,
      });

      await client.writeContract({
        address: txData.address,
        abi: txData.abi,
        functionName: txData.functionName,
        args: txData.args,
        account,
      });
    }
    ```
  </Tab>
</Tabs>

## Permit Support

Not all tokens support EIP-2612 permits. Use `prepareDepositAuthorization()` to check:

| Token | Supports Permit |
| ----- | --------------- |
| USDC  | Yes             |
| USDG  | Yes             |
| pyUSD | Yes             |
| USDT  | **No**          |

<Warning>
  Smart contract wallets (like Privy Smart Wallets or Safe) cannot sign permits.
  Use the approval flow with transaction batching instead.
</Warning>

## Error Handling

| Error Message Pattern                | Description                    | Resolution                                    |
| ------------------------------------ | ------------------------------ | --------------------------------------------- |
| `"SDK not initialized"`              | SDK not initialized            | Call `initAmplifySDK()` first                 |
| `"Vault not found"`                  | No account matches `vaultName` | Verify account name via `getVaultsByConfig()` |
| `"does not support EIP-2612 permit"` | Token lacks permit support     | Use approval flow instead                     |
| `"Invalid permit signature format"`  | Signature parsing failed       | Re-sign with correct typed data               |
| `"Invalid slippage value"`           | Slippage outside 0–10000 bps   | Provide value between 0 and 10000             |

## Related

* [Deposit Workflow](/v0.5.2/intro/products/earn/developers/api/deposit-workflow) - Unified deposit API
* [prepareDepositPermitSignature](/v0.5.2/intro/products/earn/developers/api/prepareDepositPermitSignature) - Build permit signature data directly
* [prepareDepositTxData](/v0.5.2/intro/products/earn/developers/api/prepareDepositTxData) - Standard deposits
* [DepositAuthMethod](/v0.5.2/intro/products/earn/developers/types/DepositAuthMethod) - Authorization types