What is USDC, and what is the cheapest way to buy it?

USDC in one paragraph

USDC is a digital dollar. Each token is issued by Circle and backed one for one by cash and short-dated US Treasuries held with regulated custodians, so one USDC is designed to always be redeemable for one US dollar. Unlike the balance in a banking app, it lives on a public blockchain, which means you can hold it yourself, send it to anyone in seconds, and use it in any app that speaks the same network.

How it stays at a dollar

The peg is not magic and it is not an algorithm. Large institutions can create new USDC by depositing dollars with Circle and destroy USDC by redeeming it. If USDC trades below a dollar, redeeming becomes profitable, supply shrinks and the price recovers. Reserves are attested monthly by an independent accounting firm, which is why USDC survived the 2022 and 2023 stress events that killed algorithmic stablecoins.

What people actually use it for

• Parking value between trades without leaving the chain.
• Sending money abroad for cents instead of wire fees.
• Getting paid, especially by clients in other countries.
• Holding dollars in places where local currency is losing value fast.
• Buying other tokens, since almost every pool prices against it.

Which network to hold it on

For almost everyone, Base is the answer. It is an Ethereum layer 2 with native Circle-issued USDC, fees that round to nothing, and enough liquidity that you can swap into anything else or bridge out whenever you want. That is why every cash buy and cash out on Proof settles in USDC on Base.

The cheapest way to buy USDC

A card purchase on a mainstream exchange typically costs 1.5% to 4% once the spread is included. Buying peer to peer removes the card network and the exchange margin: you pay a real seller from Venmo, Cash App, Zelle or Revolut, their USDC is released from on-chain escrow to your wallet, and the all-in cost lands around 1% to 2.2%.

1. Sign in with your email. A self-custody wallet is created for you.
2. Enter an amount and choose the payment app you want to pay from.
3. Reserve the best quote. The seller's USDC locks in escrow first.
4. Pay in your app with the reference shown, then verify.

What to do with USDC once you have it

You can hold it, send it to anyone with a wallet address, or swap it into thousands of other tokens across every major EVM chain at roughly 0.3% to 0.6%. When you want dollars again, cash out to the same payment apps you started with.

Risks worth knowing

• Issuer risk. USDC depends on Circle and its reserve banks staying solvent and compliant.
• Freeze capability. Circle can blacklist addresses tied to crime or sanctions.
• Wrong-network sends. USDC on one chain is not spendable on another, so check before sending.
• Key management. Self-custody means the recovery is on you, so back up your key.

Frequently asked questions