USDC is a digital dollar. One USDC is designed to be worth exactly one US dollar, today and tomorrow, and it moves on the internet the way an email does: any amount, to anyone, at any hour, in seconds.
It is also the key that unlocks everything on Based. Every market Based connects you to on Hyperliquid is margined in USDC, so USDC is what your trading balance is made of. This guide covers what it is, what backs it, how to get it, and the risks, stated honestly.
What USDC actually is
USDC is a stablecoin, a token built to hold a steady price. It is issued by Circle, a US company, which creates new USDC when dollars come in and destroys it when dollars go out. For every USDC in circulation, Circle holds a dollar's worth of reserves, in cash and short-dated US Treasuries, and publishes regular third-party attestations of those reserves.
The redeemable part is what makes the peg work. Circle customers can hand back USDC and receive actual dollars, one for one. That creates a floor: if USDC ever trades below a dollar, someone can buy it cheap and redeem it at Circle for the full dollar, and that trade pushes the price back up. USDC is not a promise about the future. It is a claim on reserves that exist now.
Why not just use dollars
Dollars live inside the banking system. They move on banking rails, during banking hours, between accounts that banks approve. An onchain market that never closes cannot run on that. It needs a dollar that lives on the same rails as the market itself.
That is why every market on Hyperliquid, from Bitcoin to Tesla to SK Hynix, is quoted and margined in USDC. Your margin is USDC, your profit lands in USDC, and your balance sits in your own wallet between trades, not on a company's ledger. It is also the whole access formula in one sentence: no brokerage account, no bank account, just a self-custodial wallet funded with USDC. Permissionless trading explains why that formula matters.
How to get USDC
The simplest route is buying it directly in the Based app with a card or bank payment, the way you would top up any finance app. It lands in your wallet, ready to trade.
The other common route is an exchange. If you already use Coinbase, Kraken or similar, you can buy USDC there and withdraw it to your wallet address, which works like sending money to an account number. Transfers settle in minutes and run at any hour, including Sunday at 3am, because none of it touches banking hours. The getting started guide walks through the full flow step by step.
The honest risks
USDC is not a government guarantee, and the honest way to think about it is as a claim on Circle's reserves. Two risks follow. The first is de-peg risk: USDC can trade away from one dollar under stress. It happened in March 2023, when part of the reserves sat at a failing US bank and USDC briefly traded below ninety cents. The peg recovered within days once the reserves were confirmed accessible, but the episode is the honest answer to whether the peg is unbreakable. It is not.
The second is issuer risk. Holding USDC means trusting Circle to manage the reserves and honor redemptions, which is a different kind of trust than trusting a broker with your stock portfolio, but it is trust all the same. For a trading balance, most people find the trade reasonable: a dollar-stable asset that moves at internet speed. For long-term savings, the usual advice applies and it applies here too. Only keep what you intend to use.
And once your USDC is in a trade, the market risks are separate and real: perps are derivatives with liquidation risk, funding fees apply while positions are open, and stock perps carry no dividends or voting rights.