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

# App Basics

## How Fizen works

Fizen Super App combines a **non-custodial crypto wallet** with real-world payment tools — all in one mobile app.

Your crypto is stored in a blockchain wallet that only you control. You use it to pay for things directly: scan a QR code at a local shop, top up your Visa card, buy an eSIM, send money to a friend.

***

## Your wallet

Fizen uses a **non-custodial wallet** — meaning only you hold your private key. Fizen cannot access, freeze, or hold your funds.

When you set up the app, you receive a private key. Keep it safe — it's the only way to recover your wallet if you lose access.

* [Set up your wallet →](/help-center/fizen-app/wallet-and-account/set-up-wallet)
* [Reset wallet & export private key →](/help-center/fizen-app/wallet-and-account/reset-wallet-and-export-private-key)

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## How crypto transactions work

Unlike bank transfers that go through a central database, crypto transactions are recorded on a **distributed blockchain network** — thousands of computers that all verify and store the same record simultaneously.

This makes transactions:

* **Transparent** — anyone can verify on-chain
* **Secure** — no single point of failure
* **Irreversible** — once confirmed, they cannot be undone

This is why you should always double-check wallet addresses before sending.

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## Supported networks

Fizen supports multiple blockchain networks. For Fizen Card top-ups, use **Solana** (lowest fees, fastest confirmation).

<Note>
  Always make sure you're sending on the correct network. Sending USDT on the wrong network may result in permanent loss of funds.
</Note>