# Transfers
> How to fund an Ozmium wallet and take value back out - the Coinbase on-ramp and off-ramp, sending, receiving, and what you need on Base before anything works.
Source: https://docs.ozmium.org/guides/deposits-and-withdrawals/
Keywords: fund base wallet, deposit withdraw base, coinbase onramp base, crypto off-ramp to bank, send receive base tokens, buy usdc on base
Updated: 2026-07-28
---

Before you can trade, earn, or borrow, you need two things sitting in your wallet on Base: a little
ETH for gas, and whatever you actually intend to use, which is usually USDC.

There are three ways to get them there.

## Buy with a Card or Bank

The app's Deposit flow uses **Coinbase Onramp**. Ozmium mints a session token, then hands you to
Coinbase's hosted checkout at `pay.coinbase.com` in a new tab. You pay by card, Apple Pay, or bank
transfer, and the asset is delivered to your wallet on Base.

Nothing routes through Ozmium. Coinbase settles the fiat side directly with you, and the crypto
arrives in the wallet you already control. Ozmium never touches either leg.

You do not need to have used Coinbase before, and you do not need to keep funds there afterward.

## Withdraw to a Bank

The same rail runs backward. **Withdraw** opens Coinbase's hosted off-ramp, sells the asset, and
settles cash to your bank. Same arrangement: hosted by Coinbase, settled directly with you.

If the ramp is unavailable you will get a plain message saying so rather than a broken screen. It
depends on Coinbase's service being configured and available in your region.

## Send and Receive Directly

If you already hold crypto somewhere else, this is usually simpler and cheaper than buying again.

**Receive** shows your address and a QR code. Withdraw to it from an exchange, making sure you pick
**Base** as the network. Sending on the wrong network is the most common way people lose funds, and no
interface can undo it.

**Send** moves a token or ETH from your wallet to any address. Check the destination character by
character before you sign; a transaction that has been included cannot be reversed by anyone.

## What You Actually Need

| Asset | Why | How Much |
|---|---|---|
| ETH on Base | Gas for Every Transaction | Balances required are nominal. Keep a buffer you never spend |
| USDC on Base | Collateral for perps, the quote asset for most things | Whatever You Plan to Use |

USDC on Base is `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`.

Running out of ETH mid-session is the single most common first-day problem. It looks like everything
suddenly failing at once, and it is resolved by holding a nominal ETH balance in reserve.

## If You Are Bridging from Another Chain

Move funds to Base using the official Base bridge or an exchange withdrawal that supports Base
directly. That step happens outside Ozmium, which does not operate a bridge.

## Related

- [Quickstart](/start/quickstart/)
- [Wallets And Base](/start/wallets-and-base/)
- [Trade](/guides/trade/)