USDT vs USDC: how do they differ?

What do USDT and USDC have in common?

USDT (Tether) and USDC (USD Coin) are both fiat-backed stablecoins. A company holds reserve assets and issues tokens meant to be worth one US dollar each. Business customers can send dollars to create tokens and return tokens to get dollars back; that two-way door, and the traders who use it, keeps the market price near $1, as we explain in how stablecoins keep their peg.

Both are traded on exchanges, both exist on more than one blockchain — USDC alone is native to 38 networks as of September 2026 — and both issuers reserve the right to freeze tokens. This page compares them only on what Tether, Circle and regulators have published. It does not rank them or suggest which to hold; figures that change often carry an "as of" date.

How do USDT and USDC compare side by side?

Sources: Tether's terms, fee page and Q2 2026 report; Circle's USDC page, transparency page, terms and MiCA announcement (all as of October 2026).

How are their reserves reported?

Tether's report for the quarter to 30 June 2026 lists total assets of about $187.75 billion against liabilities of about $183.64 billion, almost all of it tokens issued, leaving excess reserves of about $4.11 billion. Tether describes the document as an attestation by BDO, not a full audit. An earlier BDO Italia opinion on Tether's September 2025 figures used ISAE 3000, an international assurance standard, and stated plainly that the report was not the company's financial statements.

Circle's transparency page says most USDC reserves sit in the Circle Reserve Fund, an SEC-registered government money market fund managed by BlackRock, holding cash, short-dated Treasuries and overnight Treasury repurchase agreements, with the rest in cash at large banks. A Big Four accounting firm gives monthly assurance that reserves exceed USDC in circulation, under AICPA standards, and holdings are disclosed weekly.

What an attestation can and cannot prove is explained in stablecoin reserves and attestations. In the US, the GENIUS Act will require monthly reserve reports examined by a registered accounting firm and, for issuers above $50 billion, audited annual financial statements; see the GENIUS Act explained.

Who can redeem USDT and USDC for dollars?

For most people, neither token is directly redeemable. Tether's terms say you must be a verified customer, and its fee page lists a $100,000 minimum per transaction. Circle says its Mint service lets exchanges, institutional traders, banks and large financial institutions redeem one-for-one, but is not available to individuals or small businesses. A 2024 Federal Reserve note found the two primary markets look very different in practice: in its 2022 data it counted 79 unique participants dealing with Tether's issuance and redemption, against 88,341 for USDC.

What problems have USDT and USDC had?

Both records include stress. In October 2021 the US Commodity Futures Trading Commission fined Tether $41 million. It found that Tether had claimed full dollar backing while, in a 26-month sample from 2016 to 2018, it held enough fiat reserves on only 27.6% of days, and that reserves had been held with unregulated parties and mixed with funds of the exchange Bitfinex.

USDC's test came in March 2023. Circle disclosed that $3.3 billion of reserves, about 8%, were at Silicon Valley Bank when it failed. The Federal Reserve note records USDC falling below 90 cents before recovering over about three days, once US authorities said all depositors would be made whole. Each episode shows a different weak point: what the issuer says about its reserves, and where those reserves are kept.

What mistakes do people make when choosing between USDT and USDC?

• Treating them as interchangeable. They are claims on different companies, in different countries, under different regulators.
• Sending on the wrong network. The same token name can exist on several blockchains. Sending USDC on one chain to an address that expects another can lose the funds.
• Assuming you can redeem with the issuer. Your real exit is usually an exchange price.
• Ignoring freeze rights. Both issuers can block addresses, which also means stolen funds sometimes can be frozen.
• Relying on headline numbers. Compare dates: Tether's figures here are as of 30 June 2026, Circle's as of late September 2026.