> For the complete documentation index, see [llms.txt](https://whitepaper.lacunalabs.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://whitepaper.lacunalabs.io/for-developers/sdk.md).

# Wallet & Developer SDK

The Lacuna SDK lets you add private transactions to your own app or agent — the same shielding, transfers, and x402 payments the wallet uses.

## Install

```
npm install @lacuna/sdk
```

## Create A Wallet

```ts
import { LacunaWallet } from "@lacuna/sdk";

const wallet = await LacunaWallet.create({ pin });
```

## Core Actions

```ts
// Move funds into the shielded pool
await wallet.shield({ token: "USDC", amount: "100" });

// Private transfer to another user
await wallet.transfer({ to: recipientAddress, amount: "40" });

// Withdraw back to a public address
await wallet.unshield({ to: publicAddress, amount: "25" });
```

## Private x402 Payments

```ts
await wallet.payX402({
  endpoint: "https://api.example.com/resource",
  amount: "5",
  token: "USDC",
});
```

## Selective Disclosure

```ts
// Export a read-only viewing key (it can never spend)
const viewingKey = await wallet.exportViewingKey();
```

> The surface above illustrates the developer experience; method names are stabilizing ahead of the public release — see the [Roadmap](/resources/roadmap.md).


---

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