USDC is a stablecoin pegged to the US dollar, issued primarily by the company Circle. Like USDT, it aims to maintain a stable one-to-one value with the dollar, but it has generally positioned itself with a stronger emphasis on regulatory compliance and reserve transparency.
What that positioning means in practice is measurable rather than a matter of marketing, and the specifics are worth knowing. So is the fact that USDC has experienced the most instructive depeg in stablecoin history — one that happened while it was fully backed.
The basics
USDC is issued by Circle, a US-based company. As of mid-2026 there is roughly $76.5 billion in circulation against approximately $76.7 billion in total reserves, making it the second-largest stablecoin after USDT.
The reserve composition is deliberately narrow: cash held at regulated financial institutions, and short-dated US Treasury securities. There are no corporate loans, no gold, no bitcoin, and no other volatile assets in the backing.
That narrowness is a design choice with a trade-off. Simpler reserves are easier to verify and faster to liquidate, but they generate less income for the issuer than a broader mix would.
Where USDC and USDT actually differ
Both are fiat-backed stablecoins pegged to the dollar. For everyday use they are interchangeable in most respects. The differences are in disclosure, reserve composition, and regulatory posture — and they are factual rather than a matter of opinion.
Disclosure frequency. Circle publishes reserve holdings weekly, with a monthly attestation from a Big Four accounting firm. Tether publishes a quarterly attestation from BDO Italia. Both are attestations rather than full audits, but the cadence and the size of the firm involved differ.
Reserve composition. USDC holds cash and short-dated Treasuries only. USDT's reserves also include gold, bitcoin, secured loans, and other investments alongside its majority Treasury position.
Jurisdiction. Circle is US-based and has pursued US regulatory frameworks directly. Tether operates from outside the US, though it has launched a separately regulated US token.
Availability. European regulation under MiCA has restricted access to some stablecoins for EU users, and availability differs significantly by region for both.
None of this makes one categorically better. They are different combinations of trade-offs — broader reserves that generate more income versus narrower reserves that are simpler to verify; frequent disclosure versus quarterly. Which trade-off matters depends on what you are using it for.
The March 2023 depeg, and why it is the most important thing on this page
In March 2023, Silicon Valley Bank failed. Circle disclosed that $3.3 billion of USDC's reserves were held there.
USDC fell to roughly $0.87 over that weekend.
Here is what makes this the single most instructive event in stablecoin history: USDC was fully backed the entire time. The reserves existed. The disclosure was accurate and immediate. The funds were almost entirely recovered within days once federal regulators guaranteed SVB deposits, and the peg restored.
Nothing about the backing was wrong. What failed, temporarily, was access — and confidence in access.
The lesson generalises beyond USDC. A stablecoin peg rests on three things working at once: assets existing, redemption functioning, and people believing redemption will function. Break any one of the three and the peg breaks, regardless of the other two.
The episode also demonstrated something less obvious. Circle disclosed the exposure quickly and specifically, which is what allowed the market to price the actual risk rather than the imagined one. A slower or vaguer disclosure would likely have made the depeg deeper and longer.
Attestation and audit
The same distinction that applies to any stablecoin applies here.
An attestation confirms that on a specific date, reported assets existed and matched or exceeded reported liabilities. A full audit examines the company's financial statements over a period, tests the substance of the assets, evaluates internal controls, and issues a formal opinion.
Circle publishes monthly attestations from a Big Four firm, having moved from Grant Thornton to Deloitte, alongside weekly reserve holdings reporting. That is more frequent and involves a larger firm than the quarterly BDO Italia attestations Tether publishes.
It is still an attestation regime rather than a continuous audit. More frequent verification narrows the window between checks. It does not eliminate it.
Regulation
The GENIUS Act, signed into US law in July 2025, created a federal framework for payment stablecoins requiring issuers to be US-domiciled, hold one-to-one reserves in cash and short-dated Treasuries, publish monthly attestations, and submit to federal supervision.
USDC's existing structure already resembled these requirements closely, which is a consequence of Circle's earlier positioning rather than a coincidence.
In the European Union, MiCA imposes its own requirements, and access to different stablecoins for EU users has shifted considerably through 2025 and 2026 as exchanges adjusted. Availability in your country is worth checking directly rather than assuming.
What you are exposed to
Holding USDC means holding a claim on Circle.
You are exposed to Circle's solvency, to the banks where the cash portion sits, to whether redemption functions when you need it, and to the regulatory environment Circle operates in. The March 2023 episode was specifically an exposure to the banking system, transmitted through a stablecoin.
This is different from holding a cryptocurrency in your own wallet, where you are exposed to price and to your own key management, and to no third party.
Narrower reserves and more frequent disclosure reduce some categories of that risk. They do not remove the structural fact that you are holding someone else's obligation.
Common misconceptions
"USDC is safer than USDT." They carry different risk profiles, not a ranked one. USDC has narrower reserves and more frequent disclosure. USDT has a longer operational history at a larger scale. USDC is also the one that actually depegged significantly, in 2023. Comparing published practices directly is more useful than accepting anyone's verdict.
"USDC is backed by the US government." It is not. It holds US Treasury securities as reserve assets, which is not the same as government backing of the token. There is no deposit insurance on a stablecoin.
"A monthly attestation means continuous verification." It confirms a specific date. Monthly is more frequent than quarterly and narrows the gap between checks, but it is not continuous oversight.
"The depeg proved USDC is unreliable." The reserves were intact throughout and recovered fully. What it proved is more general and more useful: full backing does not by itself guarantee a peg, because access and confidence matter too.
In practice
For everyday users, USDC and USDT serve very similar purposes: moving value quickly between platforms, trading against other cryptocurrencies, and holding a stable position during volatile market periods.
The practical choice usually comes down to which platforms and trading pairs support each one in your region, and which set of trade-offs around reserve composition and disclosure practice you find more appropriate for what you are doing.
Both are claims on companies. Neither is a dollar in a bank account.
This entry explains how USDC works and what is publicly documented about it. It is not financial advice, not a recommendation to hold any stablecoin, and not a safety guarantee. Figures reflect published reports as of August 2026; circulation, reserves, and regulatory status all change.