Look at the crypto deposits arriving at almost any offshore broker and the split is lopsided. The overwhelming majority is USDT, most of it on Tron, in round amounts, from wallets the client already had. USDC shows up from a different sort of client: corporate accounts, US-linked users, people who came in through a regulated exchange. Same dollar on the screen, two quite different products behind it.
Treasury teams tend to frame the choice as a trust question. That is the least useful framing, because a firm that converts on receipt barely holds either one. The questions that decide real outcomes are about who can freeze a transfer, which network the client will actually use, and whether a given token can lawfully touch your European entity.
Two issuers, two legal shapes
Circle issues USDC from a United States base and has spent years building toward regulated status in several jurisdictions. It publishes reserve reports monthly, holds the bulk of the reserve in short-dated US government debt through a registered government money market fund, and keeps the remainder as cash at banks. It has also obtained an electronic money institution authorisation in France, which brought USDC inside the EU regime for e-money tokens.
Tether issues USDT from an offshore group. It publishes attestation reports quarterly, and its disclosed reserve has included Treasury bills alongside other asset classes such as secured loans, precious metals and bitcoin. USDT carries substantially more circulating supply than any other dollar stablecoin and correspondingly deeper trading liquidity, particularly outside the United States and Europe.
One point deserves emphasis because it applies to both. An attestation is not an audit. An accounting firm reports a limited conclusion about figures the issuer provides at a moment in time. A financial statement audit covers a period, tests controls and produces an opinion on a full set of accounts. Neither major issuer publishes the latter for its reserve, and treating a monthly attestation as equivalent to audited accounts is a misreading of the document.
| USDC | USDT | |
|---|---|---|
| Issuer base | United States, with EU authorisation obtained in France | Offshore group |
| Reserve reporting | Monthly attestation | Quarterly attestation |
| Reserve composition | Short-dated government debt and bank cash | Government debt plus other asset classes |
| EU e-money token status | Brought inside the regime | Not authorised as an EU e-money token |
| Deepest retail networks | Ethereum, Solana, Base and other EVM chains | Tron and Ethereum |
Both have broken the peg, in different ways
USDC traded below a dollar across a weekend in March 2023 when part of its cash reserve sat at Silicon Valley Bank and the bank failed. The price recovered once the deposits were made whole. The lesson was not about crypto at all: the reserve's weak point was the banking layer, and a stablecoin is only as available as the institutions holding its cash.
USDT has traded below a dollar during broad market stress as well, most visibly during the collapse of an algorithmic stablecoin in 2022, and recovered without an issuer default. The pattern in both cases is the same. Secondary market price and redemption value are different things, and a discount on an exchange reflects who wants out at that minute rather than an arithmetic statement about the reserve.
The operational risk most firms underrate is address freezing. Both issuers can and do blacklist addresses at the request of law enforcement, and a frozen balance is frozen wherever it sits, including in your own wallet. A deposit that arrives from a tainted address can leave your treasury holding tokens it cannot move, which is an argument for screening incoming transfers before crediting an account rather than afterwards.
Networks decide what clients will actually send
The token is one decision and the chain is another, and clients care far more about the second. USDT's dominance in retail deposits is largely a Tron effect: low, predictable transfer fees and a wallet ecosystem that most non-Western retail clients already use. Circle has stepped back from Tron, so the cheap network that a large part of the retail market defaults to is effectively a USDT network. USDC's depth sits on Ethereum, Solana, Base and the other EVM chains, where fees vary with network conditions.
Which is why the wrong-network deposit is the single most common crypto support ticket at every broker we work with. A client sends USDT on one chain to an address generated for another, and recovery ranges from a manual sweep to impossible. Publishing one address per token per chain, with the chain name in large type and a confirmation step, removes most of these tickets. We go through the mechanics in TRC20 versus ERC20.
The MiCA split is a real constraint, not a headline
MiCA treats a token referencing a single fiat currency as an e-money token, issuable in the EU only by an authorised credit institution or electronic money institution, with reserve requirements and redemption at par. Circle's French authorisation put USDC inside that regime. Tether has not sought equivalent EU authorisation for USDT, and EEA trading venues responded by removing it from services offered to European users.
For an operating firm the consequence is concrete. If your European entity holds an EU licence, its stablecoin policy is set by what it may lawfully offer to European clients, not by what is convenient. If your offshore entity serves the rest of the world, it can accept what that market uses. Firms running both structures usually end up with different deposit menus per entity, which is fine as long as the client portal shows the right one. The regime's details sit in stablecoin regulation.
What this means for taking deposits
The pragmatic answer for most firms is to accept both and hold neither. Credit the client in account currency at a quoted rate, convert the token immediately through your processor or exchange partner, and keep the treasury exposure at close to zero. A firm whose liabilities are in dollars or euro has no reason to sit on a stablecoin float overnight, and the moment it does, the reserve question stops being academic.
Three controls belong in that flow regardless of which token arrives. Screen the sending address against sanctions and risk lists before crediting, because unwinding a credited deposit is far harder than delaying one. Apply the travel rule where your transfers move through regulated intermediaries, which is covered in the crypto travel rule. And record the conversion rate and the timestamp on the client's statement, so a dispute about how 500 USDT became a given account balance is settled by a record rather than by argument. The broader deposit design sits in stablecoins for deposits.
Payouts run the other way and deserve their own policy. Sending USDT to a client wallet is fast and final, with no chargeback and no recall, which is an advantage until you send to the wrong address. Withdrawal whitelisting, a small test transfer for first payouts above a threshold, and a hold period after a wallet address change are the controls that prevent most of the losses we see.
"Ask a broker why they take USDT and the answer is never about reserves. It is that the client already holds USDT, on Tron, and is not going to open a new wallet just to pay you."
— Roman Onta, Executive Director, SINGUARD
Key Takeaways
- USDC comes from a US issuer with monthly reserve reporting and EU authorisation obtained in France; USDT comes from an offshore issuer with quarterly attestations and a wider reserve mix.
- An attestation reports on issuer-supplied figures at a point in time. Neither issuer publishes audited financial statements of the reserve.
- Client behaviour follows the network, not the brand. Low-fee Tron transfers are why retail deposits arrive as USDT, and wrong-chain sends are the most common support ticket.
- MiCA's e-money token rules changed what EU entities may offer, so a group with a European licence and an offshore entity will usually run two different deposit menus.
Frequently Asked Questions
What is the main difference between USDC and USDT?
They differ in issuer structure and regulatory posture more than in how they behave day to day. Circle issues USDC from a US base with monthly reserve reporting and has sought authorisation inside the EU regime, while Tether issues USDT offshore with quarterly attestations and a broader mix of reserve assets. USDT carries far more circulating supply and deeper liquidity on low-fee networks.
Is an attestation the same as an audit?
No. An attestation is a report in which an accounting firm expresses a limited conclusion about figures the issuer supplies at a point in time. A financial statement audit is broader in scope and continuous in coverage. Both major stablecoin issuers publish attestations rather than full audited financial statements of the reserve.
Which stablecoin should a trading firm accept for deposits?
Most firms accept both and convert on receipt rather than choosing one. Acceptance is driven by where clients already hold balances, which in practice means USDT on low-fee networks for much of the retail market, while treasury policy determines what the firm is willing to hold overnight. Holding a stablecoin float is a separate decision from accepting one.