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

# Merge (to SY)

> Merge PT and YT back into SY tokens

The `ixMerge` method on the `Vault` class creates a transaction instruction that merges PT and YT back into SY tokens.

<Note>
  This method returns SY tokens. If you want to receive the base asset directly (e.g., USDC), use [`ixMergeToBase`](/yield-stripping/typescript/instructions/ix-merge-to-base) instead.
</Note>

## Usage

```typescript theme={null}
import { Vault, LOCAL_ENV } from "@exponent-labs/exponent-sdk";
import { Connection, PublicKey, Transaction, sendAndConfirmTransaction } from "@solana/web3.js";

const connection = new Connection("https://api.mainnet-beta.solana.com");
const vault = await Vault.load(LOCAL_ENV, connection, vaultAddress);

const ix = vault.ixMerge({
  pyIn: 1_000_000n,
  depositor: wallet.publicKey,
});

const tx = new Transaction().add(ix);
const signature = await sendAndConfirmTransaction(connection, tx, [wallet]);
```

## Required Parameters

| Parameter   | Type        | Description                       |
| ----------- | ----------- | --------------------------------- |
| `pyIn`      | `bigint`    | Amount of PT and YT to merge      |
| `depositor` | `PublicKey` | The depositor's wallet public key |

## Optional Parameters

| Parameter | Type        | Description                                               |
| --------- | ----------- | --------------------------------------------------------- |
| `ptSrc`   | `PublicKey` | Source PT token account. Defaults to depositor's ATA      |
| `ytSrc`   | `PublicKey` | Source YT token account. Defaults to depositor's ATA      |
| `syDst`   | `PublicKey` | Destination SY token account. Defaults to depositor's ATA |

## Returns

Returns a `TransactionInstruction` that merges equal amounts of PT and YT back into SY.