> For the complete documentation index, see [llms.txt](https://size.club/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://size.club/docs/wallet-and-store/add-funds.md).

# Add funds

Top up your wallet so you can buy Keys. That is the only thing on Size that needs a deposit: practice, grading, and receiving Payouts all cost nothing.

Adding funds does not unlock trading. Trading needs an active Life.

## When you need it

* You spent your free Key and want another Alpha Key ($1).
* You need USDC for Store purchases.

New to crypto? Start with [Getting USDC for the first time](/docs/wallet-and-store/getting-usdc-for-the-first-time.md).

## How

1. Click + next to your balance, or open Wallet.
2. Choose Receive.
3. Send USDC to the address shown, on the network shown on that screen.
4. Wait for confirmation.

{% hint style="warning" %}
Match the network shown on the Receive screen exactly. Tokens sent on the wrong network can be lost permanently.
{% endhint %}

Fiat deposits (pay by card, no crypto needed) are coming soon.

## Quick map

| Goal                     | Needs                                                |
| ------------------------ | ---------------------------------------------------- |
| Buy a Key                | Wallet balance                                       |
| Practice Trial           | Nothing                                              |
| Trial                    | Unused Key                                           |
| Trade                    | Active Life                                          |
| Withdraw profits         | Life Payout                                          |
| Withdraw unspent balance | [Withdrawals](/docs/wallet-and-store/withdrawals.md) |

## Tips

* Keep a small USDC buffer if you rebuy Keys often.
* Deposits can take a few minutes on-chain.
* Stuck? [Troubleshooting](/docs/help/troubleshooting.md).


---

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