Safety and risk

1 · Is USDT safe to hold overnight?

USDT held in a wallet you control does not change overnight unless Tether freezes the address. The risks that matter on a one-night horizon are three: a depeg event during the hours you are asleep, an address freeze hitting an account you forgot was tied to anything sanctioned, and a venue collapse if you hold on an exchange. The first is rare and historically recovers within hours. The second has hit a small number of users involved in sanctions-related activity. The third — the FTX, Celsius, Voyager pattern — is the one most readers underestimate. Self-custody removes it, at the cost of key-management responsibility you cannot delegate.

Source: Tether contract freeze events tracked at dune.com; FDIC and SDNY public filings on FTX.

2 · Is USDC actually safer than USDT?

On a printed page USDC looks cleaner: monthly attestation, NY DFS at the state level, banked at US chartered institutions, listed parent company since 2024. In the worst-week test the picture inverts. USDC fell to 0.8774 on Coinbase over the SVB weekend in March 2023. USDT at its 2022 low traded at about 0.95. The shape of the risk differs: USDC is exposed to the US banking system through its reserves, USDT is exposed to its own less-supervised structure. Neither is risk-free. The professional answer for amounts that matter is to hold both. The longer reading is in the USDT vs USDC report.

Source: Circle SVB disclosure, 2023-03-10; Coinbase USDC ticker history.

3 · What is the difference between an attestation and an audit?

An attestation is an accountant's confirmation that a specific balance existed on a specific date. The accountant takes responsibility for the snapshot, not for the broader controls of the company. An audit is a deeper opinion covering the books over a period, the controls behind them and the absence of material misstatement. Tether publishes a quarterly attestation by BDO. Circle publishes a monthly attestation by Deloitte. Neither publishes a full financial audit at the same cadence a listed bank would. This gap is the single most discussed item in the stablecoin transparency conversation.

Source: BDO Tether attestations; Deloitte Circle attestations; AICPA SSAE 18 framework for attestation engagements.

4 · Can Tether or Circle freeze my address?

Yes. Both contracts include freeze functions and both companies use them. Tether has frozen well over one billion dollars across sanctioned and exploit-linked addresses cumulatively; Circle has frozen similar quantities. The freezes respond to OFAC sanctions designations, US Department of Justice requests, court orders and, in some cases, requests from foreign law-enforcement agencies routed through US channels. For a wallet that has not interacted with sanctioned or exploit-linked counterparties, the freeze risk is very low. For a wallet that has, the risk is significant and difficult to reverse.

Source: Etherscan transaction history of Tether and Circle blacklist functions; OFAC SDN list.

5 · What happens to my USDC if Circle goes bankrupt?

Circle's reserves are held in a structure where, in a Circle bankruptcy, the reserves are not commingled with Circle's general corporate assets. The roughly 80% sitting in the BlackRock USDXX money-market fund is held in a structure designed to be bankruptcy-remote from Circle. The roughly 20% sitting as cash at chartered US banks would face the bank's own counterparty risk (mitigated up to 250,000 dollars per institution by FDIC insurance, with the rest depending on whether deposits are made whole). Practically: a Circle bankruptcy would freeze redemptions while the structure is unwound, USDC would likely depeg during the freeze, and recovery depends on the courts and the reserve structure performing as designed. None of this is hypothetical for Tether either, where a similar question has different answers because the structure is different.

Source: Circle Form S-1 and 10-Q filings post-IPO; FDIC deposit insurance scheme documentation.

Custody

6 · Should I hold stablecoins on an exchange or in self-custody?

Three considerations decide it. Size of the balance: amounts small enough to be operationally trivial are fine on exchange; amounts large enough that a venue failure would hurt should not all sit there. Your technical comfort: self-custody requires reliable backups and a clear procedure for the seed phrase. Your jurisdiction's regulation: some jurisdictions require KYC on self-custody wallets above a threshold, and some upcoming rules (notably FATF travel rule implementations) tighten further. A common split for active users: a working balance on the exchange you trade on, the rest on a hardware wallet kept offline, with a written recovery plan in a separate physical location.

Source: FATF travel rule guidance, latest 2024 revision; chainalysis annual crypto crime report.

7 · Hardware wallet, software wallet, or just my exchange?

For amounts you might lose without changing how you sleep at night: exchange is fine. For amounts you would not want to lose: hardware wallet (Ledger, Trezor, Coldcard, Keystone). For amounts in between or for active DeFi use: a software wallet (MetaMask, Rabby, Phantom on Solana) backed by careful seed-phrase storage. Two further points. One: hardware wallet plus a passphrase (the so-called "twenty-fifth word") gives you a meaningful upgrade over the seed phrase alone. Two: a small recoverable mistake when you are starting is more useful than a large catastrophic mistake later. Move a small amount, send it back to the exchange, verify the addresses and balances, then commit larger amounts.

Source: hardware vendor security advisories, latest 2024-2026.

8 · What if I lose my seed phrase?

The coins are unrecoverable. There is no reset link. No support email recovers a self-custody wallet. The two practical defences are: redundancy (write the seed in two physical places, far apart, made of materials that survive a house fire) and a passphrase only you know (so a single piece of recovered metal is not by itself a key). Reasonable readers, even technically literate ones, lose seed phrases regularly. Treat the backup process with the seriousness of the underlying balance.

Source: BIP-39 specification; Ledger and Trezor recovery documentation.

On-ramps and off-ramps

9 · What is the cheapest way to buy my first USDT?

Three common routes. One: a major centralised exchange (Binance, Coinbase, Kraken) with a card or bank deposit, then buy USDT in the spot market with a limit order — fees typically 0.1% to 1% depending on payment method and venue. Two: peer-to-peer (Binance P2P, OKX P2P) — fees on the platform itself are zero but the merchant's bid/ask spread carries cost. Three: a local OTC desk if your jurisdiction supports it. The cheapest route for a small first purchase is usually the spot market on a major exchange where you already have an account, paying with a bank transfer rather than card. The longer treatment of fee mechanics lives across the Chinese-edition library.

Source: Binance, Coinbase, Kraken published fee schedules; editor-tested on-ramp transactions, 2026 Q1.

10 · How do I cash out USDT back to dollars?

The mirror of the buy. On a US-regulated exchange you can sell USDT (or USDC) for USD and withdraw to a linked bank account; on Binance and other global venues you can sell for USD or your local currency through P2P, OTC partner banks, or in some markets via card withdrawal. Two friction points to plan for. One: large withdrawals trigger enhanced KYC checks even on accounts that are already KYC-verified. Two: your bank may treat large incoming crypto-related transfers as flagged transactions; some banks (notably in the UK and Australia) have closed accounts over this. Test the off-ramp with a small amount before relying on it for a large balance.

Source: editor-tested off-ramp via Binance P2P and Coinbase, 2026 Q1; UK Financial Ombudsman published case reports on bank account closures.

11 · Is buying USDT with a credit card a bad idea?

Usually, yes. Card fees on most exchanges range from 2% to 4% for the purchase itself, plus the typical card-issuer cash-advance fee if your issuer treats the purchase as a cash-equivalent (some do, some do not — check before you click). Bank transfer is almost always cheaper, at the cost of two to five working days of clearing time. For test amounts or first transactions where speed matters, the card route is acceptable; for ongoing use it is expensive.

Source: published fee schedules at Binance, Coinbase, Kraken; major card issuers' cash-advance terms.

Tax

12 · Do I owe tax for buying USDT with dollars?

Buying USDT with dollars is not in itself a taxable event in the US, the UK, the EU or most major jurisdictions. It is treated similarly to buying a foreign currency or a similar asset. The tax events come later: when you sell it, swap it for another token, spend it for goods, or receive interest on it. None of this is advice. Specifically in the US, the IRS treats stablecoins as property, requiring Form 8949 reporting for each disposition. Specifically in the UK, HMRC treats them under capital gains rules. Consult a local accountant for actual filing.

Source: IRS Notice 2014-21 and subsequent guidance; HMRC Cryptoassets Manual.

13 · Do I owe tax for moving USDT between my own wallets?

Generally no. Moving the same asset between wallets you own is not a disposition in any major jurisdiction's framework. Keep records of the transactions anyway, including the destination addresses, the dates and the network fees paid. Some tax software treats the gas fee on a self-to-self transfer as a small disposition of the gas token (ETH, MATIC, TRX), which can complicate cost-basis tracking. For most retail holders the amounts are immaterial; for active users they add up.

Source: IRS published guidance on wallet-to-wallet transfers; HMRC Cryptoassets Manual; Singapore IRAS e-Tax Guide on Income Tax Treatment of Digital Tokens.

14 · Do I owe tax for swapping USDT to USDC?

In most jurisdictions, yes. A swap from one stablecoin to another is treated as a disposition of the first asset and a purchase of the second. In the US that is two events on Form 8949. Because both legs are pegged to the dollar, the realised gain or loss is typically very small (a few cents per coin, sometimes literally zero), but the event itself is reportable. If you swap USDT to USDC and back a hundred times in a year, you have two hundred reportable events. Tax software handles this if you import transactions cleanly; manual filing for active users becomes painful quickly.

Source: IRS Form 8949 instructions; HMRC Cryptoassets Manual section on like-for-like swaps.

Depegs and stress events

15 · What did the USDC depeg actually look like in March 2023?

SVB failed on Friday, March 10, 2023. Circle disclosed late Friday evening that 3.3 billion of USDC reserves were held there. USDC fell from about 0.99 to 0.87 on Coinbase by the early hours of Saturday morning, with smaller Curve pools quoting below 0.82 transiently. Circle paused minting and redemption for the weekend because US banking rails were closed. On Sunday evening the Treasury, Federal Reserve and FDIC announced that SVB depositors would be made whole. USDC recovered to about 0.96 by Sunday night and to 1.00 by Monday banking open. The episode is reconstructed hour by hour in the USDT vs USDC report.

Source: Circle press statements 2023-03-10 to 13; joint Treasury/Fed/FDIC press release 2023-03-12; Coinbase ticker history.

16 · What is the worst thing that has happened to a stablecoin?

The Luna / UST collapse in May 2022. Terra's UST was an algorithmic stablecoin paired with the Luna token; when UST faced sustained sell pressure on Anchor (a deposit product paying 20% yield), the absorption mechanism failed and a death spiral ensued. UST fell from 1.00 to under 0.10 over four days. Luna fell from 80 dollars to under 0.0001 dollars. About 60 billion of paper value evaporated. The episode rewrote how regulators treat algorithmic designs and is the reason MiCA explicitly restricts the structure. The lesson for new holders: if a stablecoin pays you double-digit yield and the documentation is mostly about token mechanics rather than reserves, treat it with suspicion.

Source: SEC complaint against Terraform Labs and Do Kwon, 2023; Anchor protocol transaction history on terrascan.

17 · Do exchanges go down during a depeg?

Sometimes. During the USDC SVB weekend, Coinbase paused USDC-to-USD conversions for several hours. During the Luna collapse, multiple exchanges paused withdrawals on Luna and UST and several reported partial outages. During severe market shocks, exchanges throttle order matching to prevent stop-loss cascades from accelerating the move. For practical purposes: do not assume you can transact at the screen price during a depeg. Spreads widen, withdrawal queues lengthen, and emergency exits are crowded. Plan for it before you need it.

Source: Coinbase and Binance status pages, 2022-05 through 2023-03; CFTC settlement disclosures referencing exchange behaviour during shocks.

Regulation and the future

18 · What did MiCA change for stablecoins?

MiCA — the EU Markets in Crypto-Assets Regulation — entered fully into force in mid-2024 with a transition window that closed in early 2026. It introduced two relevant categories: e-money tokens (EMTs), the closest to traditional fiat-backed stablecoins, and asset-referenced tokens (ARTs), covering more complex baskets. The practical consequence has been that USDT spot pairs have largely been removed from major EU-licensed exchanges; USDC remains broadly available because Circle obtained the EU registrations early; EURC has picked up market share as the licensed euro-referenced option. For a holder in the EU, the answer to "which exchange will keep my stablecoin available" has shifted toward USDC and EURC.

Source: ESMA published guidance on MiCA implementation; Kraken EU and Binance EU public communications 2024-2026.

19 · What does the Hong Kong stablecoin ordinance change?

The HKMA's stablecoin licensing regime came into force in 2025. It creates a domestic licensing requirement for fiat-referenced stablecoins issued or promoted to retail in Hong Kong. FDUSD, issued by a Hong Kong trust company, was positioned for a first-wave licence. USDC's local distribution partners filed applications. USDT did not pursue the HK route through the same channel. For Hong Kong residents and operators the practical answer to "which stablecoin can I hold under a regulated framework locally" has narrowed to a short list of HKMA-supervised tokens. For everyone else, the ordinance is mostly a useful blueprint of how a regulator approaches the category.

Source: HKMA stablecoin ordinance and accompanying public consultation documents; SFC published licensee list.

20 · Will stablecoins still exist in five years?

Almost certainly yes, in some form. The use cases — cross-border settlement, twenty-four-hour transfer, programmable money, exchange working balance — have not weakened. The legal forms will change. US federal legislation has been in motion through 2025 and 2026; whatever passes will reshape who can issue and under what reserve rules. MiCA will continue to evolve. The HKMA, MAS and SFC regimes will each tighten. Whether USDT and USDC are still the two largest stablecoins in 2031 is uncertain — the issuers and the regulatory framework around them can both change — but the category of "tokenised dollar reference" is now part of the financial system in a way that is hard to roll back.

Source: ongoing US Senate and House legislation (Lummis-Gillibrand, FIT21 successor bills); ESMA, HKMA, MAS public roadmaps.

If this answered the easy questions

The deeper readings are:

If a question is not on this list and you think it should be, email [email protected]. The next revision will add it.