> ## 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.

# Realloc Orderbook Account

> Low-level instruction to reallocate orderbook account size

# createReallocOrderbookAccountInstruction

Builds a raw instruction to reallocate the orderbook account to accommodate more offers or data. This instruction increases the size of the orderbook account when needed.

<Note>This instruction can be called by anyone who is willing to pay for the additional rent. It does not require admin authority.</Note>

## Usage

```typescript theme={null}
import { createReallocOrderbookAccountInstruction } from "@exponent-labs/exponent-sdk/client/orderbook";
import { PublicKey, SystemProgram, SYSVAR_RENT_PUBKEY } from "@solana/web3.js";

const ix = createReallocOrderbookAccountInstruction(
  {
    payer: payerPublicKey,
    orderbook: orderbookAddress,
    vault: vaultAddress,
    systemProgram: SystemProgram.programId,
    rent: SYSVAR_RENT_PUBKEY,
  },
  {
    seedId: 0,
  }
);
```

## Accounts

| Name            | Type        | Signer | Writable | Description                     |
| --------------- | ----------- | ------ | -------- | ------------------------------- |
| `payer`         | `PublicKey` | Yes    | Yes      | Account paying for reallocation |
| `orderbook`     | `PublicKey` | No     | Yes      | Orderbook account to reallocate |
| `vault`         | `PublicKey` | No     | No       | Associated vault account        |
| `systemProgram` | `PublicKey` | No     | No       | System program                  |
| `rent`          | `PublicKey` | No     | No       | Rent sysvar                     |

## Args

| Name     | Type           | Description                               |
| -------- | -------------- | ----------------------------------------- |
| `seedId` | `number` (u32) | Seed identifier for the orderbook account |

## Returns

`TransactionInstruction` — a transaction instruction ready to be added to a transaction.

## Notes

* The payer will be charged the additional rent required for the increased account size
* This instruction is typically needed when the orderbook reaches capacity for storing offers
* The reallocation follows account reallocation rules and rent-exempt requirements
* Anyone can call this instruction, making it a permissionless way to ensure orderbook capacity