You can think of a stablecoin's "reserves" like a bank's vault — whether it actually holds enough money determines whether the 1 dollar stablecoin in your hand can always be exchanged back for 1 dollar.
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The reserve requirement for stablecoins is usually 1:1, but the asset composition and transparency of different issuers vary a lot. What users really need to look at is not what the issuer says, but the breakdown of reserve assets in third-party audit reports.
Reserve requirement: 1:1 is only the floor
Under the U.S. GENIUS Act, payment stablecoin issuers must back every stablecoin in circulation with 1:1 full reserves in eligible, highly liquid assets. Eligible reserve assets are strictly limited to a small number of highly liquid categories such as U.S. dollar cash, insured deposits, and short-term U.S. Treasury bills. Bitcoin, gold, corporate bonds, secured loans, and similar assets do not qualify.
The point of this rule is that it closes off the vague "asset-backed" wording of the past — issuers must use real money, or short-term U.S. Treasuries, to back their stablecoins, rather than padding the numbers with volatile assets or loans.
What should users look at? Three data points
Reserve transparency and asset composition differ greatly from issuer to issuer. As a user, you should pay attention to these three areas:
1. Audit vs attestation: look at the "depth"
There are two main types of reserve reports published by issuers:
Attestation: only checks reserve data for one specific date and does not cover changes between two reporting periods.
Audit: fully examines financial records, internal controls, and operational processes for the entire reporting period. It is harder to complete and more credible.
Tether completed its first full audit of its 2025 financial statements by KPMG in August 2026, confirming that reserves exceeded liabilities by about 6.8 billion dollars at year-end. Circle, as a public company, also faces full annual audits and SEC reporting requirements.
2. Reserve composition: look at the "content"
USDC: reserves are highly concentrated in short-term U.S. Treasury bills and cash, held through the Circle Reserve Fund, an SEC-registered money market fund managed by BlackRock. Circle discloses CUSIP-level security details and bank custody information.
Tether: as of June 30, 2026, out of about 187.75 billion dollars in reserves, roughly 47 billion dollars, or about 25%, consisted of asset classes that do not meet GENIUS Act reserve requirements, such as precious metals, bitcoin, secured loans, and publicly traded stocks. In response, Tether launched the USAT stablecoin for the U.S. market to fit the new regulatory framework.
3. Attestation report date: look at the "timeliness"
An attestation report dated March 31 can only tell you the situation on that day. Tether's Q1 2026 report covers March 31, but it was not published until May 1 — leaving a 31-day window without independent verification. Circle's monthly reports are usually published within 3 to 4 weeks, which is slightly more timely, but a similar window still exists.
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How to check on-chain?
If you hold USDC or USDT and want to know what is behind your coins, you can go directly to the issuer's transparency page and check the latest report:
USDC: Circle's official website, "Transparency and Reporting" page
USDT: Tether's official website, "Transparency" page
Download the most recent attestation or audit report and focus on two things: whether reserves cover the circulating supply, and whether the reserve asset categories match your own definition of "safe".
How to verify: visit the issuer's official transparency page, find the latest third-party attestation or audit report, and confirm that total reserve assets are greater than or equal to the circulating supply. If the share of non-highly-liquid assets in the reserve composition is too high, you may need to reassess your holding strategy based on your own risk tolerance.
