> For the complete documentation index, see [llms.txt](https://support.backpack.exchange/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://support.backpack.exchange/wallet/what-is-backpack-wallet.md).

# What is Backpack Wallet?

Backpack is a **security conscious self-custodial crypto wallet** for Solana, Ethereum, Optimism, Arbitrum, Polygon, Base, Sonic and many more blockchains.  It enables you to have complete control over their crypto assets.

## **Backpack Wallet is used for all your crypto needs.**

* sending and receiving crypto assets
* swapping crypto tokens
* staking crypto tokens
* viewing, securing and trading NFTs
* connection with cold storage hardware wallets Ledger, Trezor and Keystone
* multi-sig wallet protection
* connecting to developer testnets

[**Download the Backpack wallet for browser, iOS and Android here.**](https://backpack.app/)

***

## Backpack is a secure place to store NFTs.

NFT **collection locking** is an easy to use feature that **automatically rejects transaction requests** when an NFT is locked in the Backpack Wallet. Note: Collection locking is currently limited to select projects.

<figure><img src="https://cdn.prod.website-files.com/669641f210a1019f2d8231fa/66e0be450f09a6f6779a3aad_66e0be2da1e582580bd26ad5_what_is_backpack_wallet.png" alt=""><figcaption></figcaption></figure>


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://support.backpack.exchange/wallet/what-is-backpack-wallet.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.