Stablecoins: The Complete Guide

Introduction

For most people the first serious interaction with crypto is not buying Bitcoin. It is holding a stablecoin. You convert some money into a dollar token to trade with, or you receive a payment in one, or you park value in one while you decide what to do next. Stablecoins have become the settlement layer of the whole market: the majority of trading pairs are priced in them, they move more value between exchanges than any single volatile asset, and they are the on-ramp and off-ramp that everything else routes through. If you use crypto at all, you use stablecoins, whether or not you think about them.

That familiarity is exactly what makes them risky to take for granted. A stablecoin promises one thing, that a token will always be worth a dollar, and it is easy to assume that all of them keep the promise the same way. They do not. Behind the identical price sits a fiat-backed coin holding cash and Treasuries at a bank, a crypto-collateralised coin over-secured by other tokens in a smart contract, or a synthetic coin holding a hedged trading position. Each keeps its dollar through a different mechanism, and each fails in a different way. The ticker tells you almost nothing about which one you are holding.

This guide is built to fix that. It explains what stablecoins are and why they matter, sets out the three designs and how to tell them apart, shows how to read a reserve report and why the difference between an attestation and an audit is not pedantry, maps the 2026 regulatory landscape after the GENIUS Act and MiCA, gives you a framework for the risks that actually matter, explains where stablecoin yield comes from and therefore what it costs, and finishes with a decision matrix for choosing one deliberately. Each major theme has a satellite page that goes deeper: this hub is the map, and the map points to the detailed routes.

What stablecoins are and why they matter

A stablecoin is a crypto token engineered to hold a steady value against a reference, and in practice that reference is almost always the US dollar. The point is to combine two things that used to be in tension: the speed, programmability and global reach of a crypto token, and the price stability of ordinary money. A Bitcoin transfer settles anywhere in the world in minutes, but nobody wants to be paid in an asset that can move ten per cent while the payment confirms. A bank dollar is stable, but it cannot move on a public blockchain at any hour without an intermediary. A stablecoin is the attempt to have both at once.

Once you have a stable dollar that lives on-chain, a lot follows. It becomes the natural unit for trading, because pricing everything against a steady dollar is far easier than pricing it against a moving asset. It becomes a way to sit out volatility without leaving the crypto system, so a trader can move from Ether into a dollar token in seconds rather than waiting days for a bank transfer. It becomes a payment rail, letting someone send the equivalent of cash across borders without a correspondent bank in the middle. And it becomes a place to earn, because a dollar that can be lent, supplied to a protocol, or placed in an exchange product can pay a return the way a savings account does.

For the person reading this, that translates into four everyday jobs. Trading: the dollar side of almost every pair you will touch is a stablecoin. Parking: a place to hold value between decisions without cashing out to a bank. Payments: sending and receiving dollars that settle in minutes. Yield: earning a cash-like return on balances you are not actively using. Every one of those jobs is also the first action of a mainstream exchange's retail product, which is why understanding stablecoins is the foundation for almost everything else on this site, from choosing a venue to reading a yield offer critically.

The scale is not marginal. By industry estimates as of 2026, stablecoins collectively represent hundreds of billions of dollars of value and settle trillions of dollars in transfers a year — significant enough that the United States passed a dedicated federal law and the European Union folded them into a comprehensive regime. When lawmakers write bespoke rules for a category of token, that category has stopped being niche. The rest of this guide treats stablecoins with the seriousness that scale demands.

The three designs: fiat-backed, crypto-collateralised, synthetic

Every stablecoin answers one question: what stands behind the dollar it promises? There are three broad answers, and they define the three families you need to recognise. Getting the family right is the single most useful skill in this whole topic, because it tells you immediately how the coin holds its peg and how it could break.

Fiat-backed stablecoins

A fiat-backed stablecoin is the most straightforward design and by far the largest by value. The issuer holds a reserve of real-world assets, typically cash and short-dated government debt, and issues one token for each dollar of reserve. The promise is direct: bring a token back and redeem it for a dollar. That redemption right is what holds the market price near a dollar, because whenever the token trades below par, arbitrageurs buy it cheaply and redeem it for full value, and whenever it trades above par, they mint new tokens and sell them.

USDT, issued by Tether, and USDC, issued by Circle, are the two dominant examples, and between them they account for most of the stablecoin market. The strength of the design is simplicity; the weakness is that you are trusting the issuer to actually hold the reserves it claims and a bank to keep them safe, which is exactly what the reserves section and the depeg section examine.

Crypto-collateralised stablecoins

A crypto-collateralised stablecoin backs its dollar with other crypto rather than with cash in a bank. Because crypto collateral is itself volatile, these coins are over-collateralised: you lock up more than a dollar of crypto to mint a dollar of stablecoin, and smart contracts liquidate the collateral automatically if its value falls too far. The best-known example is DAI, now joined by its upgraded sibling USDS after MakerDAO rebranded to Sky in August 2024. The two co-exist and convert one-for-one on-chain, with DAI remaining immutable and unfreezable and USDS carrying a currently dormant freeze capability. The appeal here is decentralisation: the coin lives in transparent, auditable smart contracts rather than depending on a company's bank relationship. The trade-off is capital inefficiency and exposure to the collateral's own price behaviour, managed by the liquidation machinery rather than by a redemption desk.

Synthetic dollars

A synthetic dollar is the newest and least intuitive design, and the one most often misfiled. It does not hold cash, and it is not simply over-collateralised crypto. Instead it holds crypto collateral and hedges that collateral with an offsetting short position in derivatives, so that gains and losses cancel out and the combined value stays near a dollar. Ethena's USDe is the prominent example. The critical point, and a common and costly misunderstanding, is that a synthetic dollar is not a fiat-backed peer of USDT or USDC. Its stability comes from a live trading strategy, not from a bank balance, and its yield comes from the same place: mainly the funding rates paid on those derivatives positions plus staking rewards.

That makes it a genuinely different risk category, with exposures such as negative funding periods and the custody of hedging positions that simply do not exist for a cash-backed coin. It can have a place in a portfolio, but only when it is understood as what it is. Its risk profile is treated in full in our stablecoin depeg-risk guide.

A fourth design deserves a single line of warning rather than a family of its own: the purely algorithmic stablecoin, which tried to hold a peg with no meaningful collateral at all, using only a mint-and-burn mechanism against a paired token. That is the design that produced the UST collapse of May 2022, and it is covered as a cautionary case study rather than a live option.

How reserves work: attestation versus audit

If a fiat-backed stablecoin is only as good as its reserves, then the question of how you actually know the reserves are there becomes central. This is where two words that sound alike, attestation and audit, carry very different weight, and where a lot of confident-sounding claims quietly overstate their assurance.

An attestation is a report in which an accounting firm confirms that, at a specific moment, the issuer held reserves matching the tokens in circulation. It is a snapshot, not a film. It typically does not test the issuer's internal controls, does not track the figures across a whole period, and does not carry the assurance level of a full financial-statement audit. It is useful and far better than nothing, but it answers a narrow question at a single instant. A full audit is a deeper, standards-based examination of the financial statements as a whole, with the higher assurance that a company's ordinary published accounts receive.

The distinction is not academic, because the two largest coins have sat on different sides of it. USDT, the largest stablecoin, backed its reserves for years with quarterly attestations from the firm BDO Italia rather than a full audit. Its first-quarter 2026 attestation, as of the end of March 2026, reported roughly 191.7 billion dollars of assets against about 183.5 billion dollars of token liabilities, a surplus of some eight billion dollars, with US Treasuries the dominant holding alongside cash, gold and Bitcoin.

The important 2026 development is that in March 2026 Tether announced it had engaged a Big Four accounting firm for its first full independent audit, a process that was under way rather than completed at the time of writing. So the honest framing is neither the stale claim that USDT has never been audited nor the premature claim that it is audited; it is attestation-based today, with a first full audit in progress.

USDC has taken the more conservative posture from the start, publishing monthly attestations of reserves held predominantly in short-dated US Treasuries through a BlackRock-managed fund with custody at BNY, alongside cash at regulated banks. When you read any reserve claim, three questions cut through the marketing: is this an attestation or a full audit, how recent is it, and what is actually in the reserve. A reserve of overnight Treasuries at a large custodian is a very different thing from a reserve padded with illiquid or exotic assets, even if both add up to the same headline number. The USDT versus USDC comparison lays the two reserve structures side by side.

How stablecoins are regulated in 2026

For most of their history stablecoins grew in a regulatory grey zone. That ended in 2024 and 2025, when the two largest economic blocs each wrote rules. You do not need to be a lawyer to use stablecoins, but you do need the one-paragraph version of each regime, because regulation now determines which coin you can actually buy and hold depending on where you live. This section is the map; the full mechanism, with worked jurisdiction examples, lives in our stablecoin regulation guide.

The United States: the GENIUS Act

The GENIUS Act is the first federal framework for US payment stablecoins. It was signed into law on 18 July 2025, but signing and taking effect are not the same event. The Act takes effect on the earlier of two dates: eighteen months after enactment, which is 18 January 2027, or 120 days after the main federal regulators issue their final implementing rules. Through 2026 those rules were still at the proposed stage, with the OCC and FDIC having published proposals but no final regulations. In substance the law sets out categories of permitted issuers, a threshold above which a state-supervised issuer must move to the federal regime, a requirement for full backing in high-quality assets such as short-dated Treasuries, and a transition window of roughly three years for existing service providers.

The practical takeaway for 2026 is that the GENIUS Act is shaping issuer behaviour and expectations but is not yet the operative regime, and no US bank had launched a stablecoin under it. A widely noted point of confusion is that JPMorgan's JPMD, live since late 2025, is a deposit token rather than a payment stablecoin, and the two are not the same instrument.

The European Union: MiCA

The EU's Markets in Crypto-Assets regulation, MiCA, brought stablecoins into a comprehensive regime whose stablecoin provisions have applied since 30 June 2024, with the broader rules for crypto service providers following from the end of that year. MiCA treats fiat-backed stablecoins as e-money tokens and requires their issuers to be authorised. The crucial nuance, widely misreported, is what MiCA restricts. It restricts the offering to the public and admission to trading of non-compliant tokens by regulated service providers in the European Economic Area; it does not ban ordinary users from holding or self-custodying those tokens.

The European regulator ESMA made this explicit in a January 2025 statement clarifying that custody and transfer do not count as offering a token to the public. The concrete consequence, examined next in the risk framework and in the regulation guide, is that USDT was removed from trading pairs on compliant European exchanges while USDC and the euro token EURC, both authorised, were retained.

The United Kingdom and elsewhere

The United Kingdom settled its own approach in 2026. The Financial Conduct Authority published its final rules for qualifying stablecoin issuers on 30 June 2026, with an authorisation gateway opening in September 2026 and the regime coming fully into force in October 2027, requiring full backing and redemption at par under a statutory trust. The separate regime for systemic sterling stablecoins, led by the Bank of England, was still in draft as of mid-2026. The direction of travel across major jurisdictions is the same: full backing, real redemption rights, and authorised issuers. The regulation guide keeps a dated, jurisdiction-by-jurisdiction record so you can check what applies to you rather than to a generic reader.

A risk framework for stablecoins

The word stablecoin implies safety, and that implication is the most dangerous thing about it. A stablecoin is not risk-free; it is a bundle of specific risks that a useful framework separates into four kinds. Naming them lets you judge any coin on its own terms rather than trusting the label.

Depeg risk is the headline: the coin trades away from its dollar target. It has happened across every design. The algorithmic UST collapsed to near zero over about three days in May 2022 when its mechanism entered a death spiral, wiping out roughly forty billion dollars. USDC fell to around eighty-seven cents for a weekend in March 2023 when part of its reserves was trapped at the failed Silicon Valley Bank, then recovered fully within days once the bank's depositors were guaranteed. Those two events look similar on a chart and are opposites underneath: one was a design failure, the other a temporary custody scare at a fully backed coin. Distinguishing the two is the core skill our depeg-risk guide teaches.

Issuer risk is the chance that the company or protocol behind the coin fails, misreports, or is compelled to stop. BUSD is the clearest illustration: once a major stablecoin, it was wound down after New York's financial regulator ordered its issuer Paxos to stop minting it in February 2023, and support ended by December 2023. It is defunct today, which is why treating a discontinued coin as live is a real and avoidable mistake. Issuer risk is what reserve transparency, redemption terms and regulatory standing are all trying to measure.

Venue and custody risk is the risk attached not to the coin but to where you keep it. Holding a stablecoin on an exchange means trusting that exchange to stay solvent and to let you withdraw. Holding reserves at a single bank is what turned an SVB failure into a USDC wobble. This is the layer where operational security matters most, and where general custody hygiene, the choice between exchange balances and self-custody, and withdrawal discipline apply just as they do for any crypto asset; our operational security guide covers the discipline in full.

Regulatory risk is the chance that a rule change alters what you can do with a coin. The clearest 2026 example is access: because Tether did not seek MiCA authorisation, compliant European exchanges removed USDT trading pairs, so a European user's practical options narrowed even though the coin itself did nothing wrong. Regulatory risk rarely destroys value overnight, but it can quietly strand a holding on the wrong side of a border. Reading any coin against these four risks, rather than against its reassuring name, is the habit this guide is trying to build.

Earning yield on stablecoins

One of the reasons people hold stablecoins is that, unlike cash in a drawer, an on-chain dollar can be put to work. But the single most important idea about stablecoin yield is that it always comes from somewhere, and the source of the yield is the shape of the risk. A return that looks like free money is never free; it is a rate you are being paid to take on a risk that someone has to bear. There are three broad routes, and our earning-yield guide walks through each with the red flags to watch.

The first route is exchange Earn products, where an exchange pays you a return on stablecoin balances funded by the interest it makes lending them out or holding Treasuries. The convenience is high and the counterparty is the exchange, so the risk is the exchange's solvency and terms. The second route is native yield-bearing tokens, where the interest earned by a coin's own reserves is passed through to holders, so the yield is closer to the underlying Treasury rate and the risk is the issuer's. The third route is DeFi lending, where you supply stablecoins to a protocol and earn the rate borrowers pay, taking on smart-contract and liquidity risk in exchange; the mechanics of that route belong to our DeFi lending guide, and the main on-chain venue for swapping between stablecoins is reviewed in our Curve review.

Two cautions travel with all three routes. First, a yield far above what short-term government debt pays is a signal, not a bargain: something is taking extra risk to produce it, and that something may ultimately be you. Second, a synthetic dollar's yield is a special case, because there the stability and the return come from the very same trading strategy, so the yield is not a bonus on top of a safe dollar but the compensation for the strategy's risk. Where stablecoin yield shades into the territory of tokenised money-market instruments, the boundary belongs to our tokenised treasuries guide, which owns that comparison.

How to choose a stablecoin

Choosing a stablecoin well is not about finding the single best coin; it is about matching a coin to a use and a jurisdiction. The decision matrix below pairs the common jobs with the design that usually fits, and the two worked examples after it show the reasoning in motion. Treat both as starting points to adapt, not as advice, and always check the current regulatory position for where you live.

Persona one: parking about two thousand dollars between trades. Here the priorities are convenience, deep liquidity and easy movement in and out of positions, and the sum is small enough that a short custody window on a reputable exchange is a reasonable trade for that convenience. A widely supported fiat-backed coin fits, with the specific choice driven by where you trade: USDC on a compliant European or US venue, or USDT where its liquidity is deepest and the EU trading restrictions do not apply. The dominant risk is venue risk rather than the coin itself, so the discipline is to hold it on a venue you trust and to move it to self-custody if the balance grows or lingers.

Persona two: receiving a thirty thousand dollar payment. Now the priorities shift to reliability of redemption, transparency and regulatory clarity, because the sum is large enough that you want to be able to convert cleanly to bank money and to know exactly what stands behind the token in the meantime. A transparent, regulated, fiat-backed coin is the natural default, which in most jurisdictions points to USDC, with its public issuer, Treasury-heavy reserves and authorised European standing. The reasoning is not that USDC is universally best but that this particular job weights transparency and redemption over raw liquidity, and the design should follow the job.

The through-line across both examples is the same one this guide keeps returning to: decide what you need the coin to do, check what your jurisdiction allows, and let the design follow from the use. Do that, and the choice that felt bewildering when every coin claimed to be a safe dollar becomes straightforward. The head-to-head that most readers ask for, USDT against USDC, is worked through in full in our USDT versus USDC comparison.

How to acquire, convert and hold stablecoins

Knowing which coin you want is half the job; the other half is the unglamorous mechanics of getting it, moving it and keeping it without paying avoidable costs or making an irreversible mistake. The mechanics are the same on every serious venue, which is why this section is deliberately venue-agnostic: learn the moves once and they transfer anywhere.

There are two ways a stablecoin arrives in your hands. The first is buying it: you open an account with an exchange, complete identity verification, deposit your local currency, and buy the coin. Two details in that chain cost real money. The deposit rail matters, because a bank transfer is usually cheap or free while a card deposit is instant but typically carries a fee of a few per cent, which on a large sum dwarfs everything else. And the buying method matters, because most venues offer both a spot market and a one-click instant-buy, and the instant-buy convenience is priced into a wider spread.

For anything beyond pocket change, the spot pair is almost always the cheaper route. The second way is receiving: someone pays you directly, and there is no purchase step at all. You give the sender a deposit address, and everything then depends on one thing getting the address right, which brings us to networks.

The single most important mechanical fact about stablecoins is that the ticker names the token, not the rail it travels on. The same USDT exists on Ethereum, Tron, Solana and several other networks; the same USDC spans its own list. They are the same dollar but they move on different rails, with transfer fees that range from a few cents on one network to several dollars on another, and they are not interchangeable in transit. The sender's network and the receiver's deposit address must match exactly, because a token sent to an address on the wrong network is the classic irreversible loss in this whole subject. When you withdraw from an exchange, the network selector on the withdrawal screen deserves more attention than any other setting on the page. When someone specifies a network for a payment, match it exactly rather than assuming the default.

Sooner or later you will hold one stablecoin and need another: a venue supports one but not the other, a payment has to go out in a specific coin, or a move between jurisdictions makes a regulated coin the practical choice, for the access reasons the regulation section maps. Converting is cheap if you watch the right number. On an exchange, the real cost is not the quoted fee but the spread between the two coins, and for larger amounts the spot order book is usually tighter than the one-click convert button.

On-chain, dedicated stablecoin pools exist precisely for this job and quote deep liquidity between the major coins, at the price of a network fee and of interacting with a smart contract yourself. Whichever route you use, compare the amount you will actually receive rather than the advertised fee, because a zero-fee conversion with a wide spread is the more expensive trade wearing a friendlier label.

Then comes the quiet decision that matters more than any single trade: where the balance lives. Held on an exchange, a stablecoin is convenient and instantly tradable, and it is also a claim on that venue rather than a token in your control, which is the venue risk described earlier in the risk framework. Held in a self-custody wallet, it is fully yours, along with full responsibility for the keys. A reasonable rule for a retail holder is that balances you are actively using can sit on a venue you trust, while sums that matter or balances that linger belong in self-custody; the operational discipline that keeps self-custodied funds safe is its own subject, covered in our operational security guide.

Whenever you move funds between an exchange and a wallet in either direction, one habit prevents the expensive version of every mistake in this section: send a small test amount first, confirm it arrived, and only then move the rest.

Leaving is the same machinery in reverse. To turn a stablecoin back into bank money you sell it for your local currency on a venue that supports your currency and your bank rail, and the practical differences between venues show up exactly here: which fiat currencies they pay out, what the withdrawal fee is, and how long the payout takes. This is also the step where the jurisdiction homework from the choosing section pays for itself, because a venue that is properly authorised where you live is the one whose bank withdrawals work smoothly. Keep the records of what you bought, converted and sold as you go; a clean paper trail costs nothing in the moment and is tedious to reconstruct later.

Conclusion

Stablecoins earned their place at the centre of crypto by solving a genuine problem: they put the stability of a dollar onto a fast, global, programmable rail. That usefulness is real, and it is why they now settle more value than any single volatile asset and why lawmakers on both sides of the Atlantic wrote rules for them in 2024 and 2025. But the same familiarity that makes them useful makes them easy to misjudge, because the identical one-dollar price hides three very different machines underneath, and each machine can break in its own way.

The through-line of this guide is that the design is the risk. A fiat-backed coin lives or dies by the quality and honesty of its reserves, which is why the difference between an attestation and a full audit is worth knowing and why USDT's first audit, under way in 2026, is a genuine development rather than marketing. A crypto-collateralised coin trades a bank relationship for smart-contract liquidation machinery. A synthetic dollar is a live trading strategy wearing a dollar's clothes, and its yield is the price of its risk rather than a free bonus. Read any coin through the four risks, depeg, issuer, venue and regulatory, and the reassuring label stops doing your thinking for you.

Regulation has made the map more legible and, in places, more restrictive. The GENIUS Act is signed but not yet in force through 2026, and MiCA has already reshaped which coins a European user can readily buy without banning anyone from holding them. Those rules will keep moving, which is why every figure and status on this site is dated and why the satellite pages are refreshed as the position changes. From here, the natural next steps depend on your goal: the regulation guide if you need to know what applies where you live, the earning-yield guide if you want to put balances to work without being caught by an unsustainable rate, the depeg-risk guide if you want to read the warning signs early, and the USDT versus USDC comparison if you are choosing between the two biggest coins today.

Pick a stablecoin the way you would pick any financial instrument: deliberately, for a job, with your eyes open to what stands behind it.

Sources

• US Congress — GENIUS Act (S.1582, Public Law 119-27): primary legislative record backing the 18 July 2025 signing, the effective-date formula, and the permitted-issuer and reserve provisions.
• EUR-Lex — Markets in Crypto-Assets Regulation (MiCA): the regulation text behind the e-money-token rules applying to stablecoins from 30 June 2024.
• ESMA — statement on non-compliant stablecoins: the January 2025 clarification that custody and transfer do not constitute offering to the public, so holding remains permitted.
• Circle — USDC transparency and reserve attestations: issuer source for USDC reserve composition, monthly attestations, and MiCA e-money-token authorisation.
• Tether — USDT reserves and attestation reports: issuer source for the quarterly BDO Italia attestations and the Q1 2026 reserve figures.
• US Federal Reserve — FEDS Note on the SVB failure and the March 2023 stablecoin run: regulator analysis of the USDC depeg, the SVB reserve exposure, and the recovery.
• NYDFS — order to Paxos to cease minting BUSD: New York regulator source behind the February 2023 mint-stop and the wind-down of BUSD.
• UK FCA — final rules for qualifying stablecoin issuers: source for the June 2026 policy statement, the September 2026 gateway, and the October 2027 in-force date.
• Ethena — USDe documentation: issuer documentation confirming USDe as a delta-hedged synthetic dollar rather than a fiat-backed stablecoin.
• Sky — DAI and USDS documentation: source for the 2024 MakerDAO-to-Sky rebrand, DAI and USDS co-existence, and the one-for-one converter.
• Chainalysis — industry research on stablecoin adoption and settlement volumes: context for the market-scale and annual transfer-volume estimates cited in this guide.

Frequently asked questions

What is a stablecoin, and how does it stay at one dollar?

A stablecoin is a crypto token designed to hold a steady value, almost always one US dollar, so it can be used for payments, trading and saving without the price swings of Bitcoin or Ether. How it holds the peg depends on the design. A fiat-backed coin such as USDC or USDT keeps a reserve of cash and short-term government debt and promises to redeem each token for a dollar, which anchors the market price through arbitrage. A crypto-collateralised coin such as USDS is over-collateralised with other crypto locked in smart contracts. A synthetic dollar such as USDe holds a peg by hedging crypto collateral with offsetting derivatives positions rather than by holding cash. The peg is only ever as strong as the mechanism and the collateral behind it, which is why the design matters more than the ticker.

What is the difference between USDT and USDC?

Both are fiat-backed dollar stablecoins, but they differ on transparency and regulatory standing. USDC is issued by Circle, a company that became publicly listed on the New York Stock Exchange in June 2025, holds reserves predominantly in short-dated US Treasuries through a BlackRock-managed fund, publishes monthly reserve attestations, and is authorised as a regulated e-money token in the European Union. USDT, issued by Tether, is far larger and more deeply traded, backs its reserves with quarterly attestations from BDO Italia rather than a full audit, though as of March 2026 Tether has engaged a Big Four firm for its first full independent audit. USDT is not authorised under EU rules, so regulated European exchanges have removed it from trading pairs. As a rule of thumb, USDT wins on liquidity and reach, USDC on transparency and regulated access.

Can a stablecoin lose its peg, and has it happened?

Yes. A depeg is when a stablecoin trades away from its target value, and it has happened to coins of every design. In May 2022 the algorithmic stablecoin UST collapsed to near zero in about three days when its mint-and-burn mechanism entered a death spiral, wiping out roughly forty billion dollars. In March 2023 USDC briefly fell to around eighty-seven cents when about 3.3 billion dollars of its reserves were stuck at the failed Silicon Valley Bank, then recovered fully within days once US authorities guaranteed the bank's depositors. The two events were different in kind: UST failed by design, while USDC suffered a temporary custody scare at a banking partner and was always fully backed.

What is the difference between an attestation and an audit?

An attestation is a limited report in which an accounting firm confirms that, at a single point in time, the issuer held reserves matching the tokens outstanding. It does not test internal controls, verify the figures across a full period, or carry the assurance level of a financial audit. A full audit is a much deeper, standards-based examination of the financial statements as a whole. For years the largest stablecoin, USDT, published quarterly attestations from BDO Italia but had never completed a full audit; in March 2026 Tether announced it had engaged a Big Four firm for its first full independent audit, which was under way rather than completed at the time of writing. Circle's USDC has long published monthly attestations of its Treasury-heavy reserves. Knowing which word applies tells you how much assurance you actually have.

Is USDe a stablecoin like USDT or USDC?

Not in the same class. Ethena's USDe is a synthetic dollar, not a fiat-backed stablecoin. Instead of holding cash and Treasuries, it holds crypto collateral and hedges it one-for-one with short perpetual-futures positions, so the combined value stays near a dollar. Its yield, paid through the staked version sUSDe, comes mainly from perpetual funding rates and staking rewards, which means its risks are also different: negative funding periods, the custody of the hedging positions, and exchange counterparty risk. Treating USDe as a direct peer of USDT or USDC is a mistake, because the thing keeping it at a dollar is a live trading strategy rather than a bank balance, so the yield is the risk.

Can I still use USDT in Europe?

You can still hold and self-custody USDT in Europe; it has not been banned. Under the EU's MiCA rules, which have applied to stablecoins since June 2024, Tether did not seek authorisation, so regulated European exchanges removed USDT from their trading pairs: Coinbase's European arm delisted it around December 2024, and Kraken and Binance moved to sell-only and then removed euro-area USDT pairs by the end of March 2025. The regulator ESMA clarified in January 2025 that custody and transfer are not the same as offering a token to the public, so wallets and withdrawals continue. In practice a European user can still receive and hold USDT but will find it harder to buy or trade on a compliant local exchange, where USDC and EURC are the compliant alternatives.

Is the US GENIUS Act in force in 2026?

Not yet. The GENIUS Act, the first federal framework for US payment stablecoins, was signed into law on 18 July 2025, but signing and taking effect are different things. The Act takes effect on the earlier of eighteen months after enactment, which is 18 January 2027, or 120 days after the main federal regulators issue final implementing rules. As of mid-2026 those rules were still at the proposed stage, with the OCC and FDIC having published proposals but no final regulations. So through 2026 the law shapes expectations and issuer planning, but it is not yet the operative regime, and no US bank had launched a stablecoin under it.

Did MakerDAO's DAI get replaced by USDS?

No, DAI was not replaced or shut down. MakerDAO announced its rebrand to Sky in August 2024 and launched the upgraded USDS token in September 2024, with the governance token MKR convertible to SKY. On-chain, DAI and USDS co-exist, and holders can convert between them one-for-one through a converter contract in either direction. There is an important difference: DAI remains immutable and cannot be frozen, whereas USDS carries a freeze capability, which is currently dormant and would require a Sky governance vote to activate. One practical wrinkle in 2026 is that several large exchanges force-converted exchange-held DAI to USDS and delisted DAI trading pairs, so the free co-existence is most true for coins you hold in your own wallet rather than on an exchange.

How can I earn yield on stablecoins safely?

Yield on a stablecoin has to come from somewhere, and the source is the risk. There are three broad routes. Exchange Earn products pass on interest an exchange makes from lending or from Treasuries, and carry the exchange's counterparty risk. Native yield-bearing tokens pass on the interest earned by the reserve itself. DeFi lending pays you the rate borrowers pay, and carries smart-contract and liquidity risk. A rate that is far above what short-term government debt pays is a signal that someone is taking more risk to produce it, and that someone may be you. The safe approach is to prefer transparent sources, to spread across venues rather than chasing the single highest advertised rate, and to treat any double-digit stablecoin yield as a claim to investigate rather than accept.

Which stablecoin should I choose?

Choose by what you need the coin to do and where you live, not by which ticker is most familiar. If you want the deepest liquidity and the widest exchange support and you are outside the European trading restrictions, USDT is hard to beat. If you want the strongest transparency and regulated access, especially in Europe or the United States, USDC is the natural default. If you specifically want decentralisation and an on-chain coin that cannot be frozen, DAI fits, with USDS as its upgraded sibling. If you are chasing yield and understand that you are taking on a live trading strategy's risk, a synthetic dollar such as USDe is a deliberate, higher-risk choice rather than a cash equivalent. Match the design and the jurisdiction to your use, and the choice usually makes itself.

Related resources

• Stablecoin regulation guide — the GENIUS Act and MiCA in operational depth, with a jurisdiction-by-jurisdiction matrix of what you can buy and hold where.
• Earning yield on stablecoins — where stablecoin yield actually comes from across exchange Earn, native tokens and DeFi, and the red flags that mark an unsustainable rate.
• Stablecoin depeg risk — the UST and USDC-SVB case studies, the distinct risks of synthetic dollars, and a checklist for reading early-warning signals.
• USDT vs USDC comparison — design, reserves, attestation versus audit, jurisdiction access and depeg history side by side, with a which-for-what verdict.
• Curve review — the leading on-chain venue for swapping between stablecoins, its stablecoin pools, and the risks its recent history makes worth knowing.

Financial Disclaimer

This content is not financial advice. All information provided is for educational purposes only. Cryptocurrency investments carry significant investment risk, and past performance does not guarantee future results. Always do your own research and consult a qualified financial advisor before making investment decisions.