For quick definitions of terms used here, the Crypto Glossary covers peg, redemption, reserves, depeg, and oracle. New to crypto entirely? Start with the blockchain basics article first.
A stablecoin is a crypto token designed to track a stable reference value, almost always the US dollar. It does this through one of two broad mechanisms: redeemable backing (you can swap the token for underlying assets), or a market mechanism (supply and incentives try to hold the peg without robust redemption). Stablecoins are the cash rail of crypto markets, used for trading, settlement, lending, and payments. They are useful, but they are not risk-free. The single most important question to ask of any stablecoin is whether you can actually redeem it at par when markets are stressed.
What Are Stablecoins?
A stablecoin is a token built to track a reference value, almost always the US dollar. The aim is for one unit of the stablecoin to remain worth one dollar regardless of what is happening in the broader crypto market. That stability is the entire product.
Stablecoins exist because crypto markets are volatile and trading or moving funds in volatile assets is operationally awkward. A stablecoin lets a trader sit in a dollar-equivalent without leaving the crypto ecosystem, lets a DeFi protocol settle in something predictable, and lets payments cross borders without bank rails. They are the cash layer that makes the rest of the system function.
The peg is held in one of two broad ways:
Each token is backed by reserves that holders can redeem for. Arbitrage between the token and the underlying reserves keeps the price close to par. If the token trades below the redemption value, traders buy the token cheaply and redeem it for full value, pulling the price back up.
Supply and demand are managed by code or incentives, with no reliable underlying redeemable asset. The peg holds as long as the mechanism works. When confidence breaks, these mechanisms can fail catastrophically. This is the algorithmic stablecoin model and it has a poor historical track record at scale.
Stablecoins are not the same as dollars in a bank. The legal, regulatory, and operational frameworks are different. The peg is a design goal, not a guarantee. Any stablecoin can depeg under enough stress. When and why a stablecoin depegs is its own analytical question, covered in the depeg risk explainer.
The Four Main Types Of Stablecoins
Stablecoins are usually grouped into four buckets based on what backs the peg. Each bucket has a different risk surface, which means the safety analysis is different for each. Conflating them is the most common analytical mistake beginners make.
Fiat-Backed Stablecoins
Backed by cash and cash-equivalent assets like short-dated US Treasury bills, held by a regulated issuer. The classic examples are USDT (Tether) and USDC (Circle). One token in your wallet is intended to correspond to roughly one dollar of reserves at the issuer.
Main risks: issuer insolvency, banking partner concentration, redemption restrictions or freezes, regulatory action against the issuer, and the gap between attestations (snapshots) and audits (full assurance). Proof of reserves alone does not solve this, because it does not capture liabilities.
Commodity-Backed Stablecoins
Backed by a physical commodity, almost always gold. Each token represents a claim on a defined quantity of the underlying commodity held in storage. PAXG (Paxos Gold) and XAUT (Tether Gold) are the established examples.
Main risks: custody failures, redemption friction (most holders cannot realistically redeem for physical gold), counterparty exposure to the issuer, and commodity price volatility translating into token price volatility, since the peg is to the commodity, not to a stable fiat value.
Crypto-Collateralised Stablecoins
Backed by other crypto assets locked in smart contracts, typically with overcollateralisation to absorb price volatility in the collateral. DAI is the long-running example. The mechanism is enforced by code rather than by a corporate issuer.
Main risks: smart contract exploits, oracle failures (if the price feed is wrong, liquidations misfire), liquidation cascades during volatile periods, and governance risk where token holders can vote to change collateral rules. DAI is sometimes labelled algorithmic, but the practical risk set is collateral, smart contract, and liquidation design, not the kind of reflexive supply mechanism that defines a true algorithmic stablecoin.
Algorithmic Stablecoins
Attempt to hold a peg through supply mechanics and incentives, without robust redeemable backing. The mechanism varies by design, but the common feature is that the system relies on arbitrage participants and confidence rather than a redeemable reserve.
Main risks: reflexive death spirals, bank-run dynamics with no underlying reserves to redeem against, sudden total peg loss, and contagion to anything that held the failed stablecoin or its associated token.
The Single Most Useful Test: Can You Actually Redeem?
The technical type of a stablecoin matters less than one practical question: under stress, can you convert your stablecoin back to its reference value at par, fast, without restrictions?
If the answer is yes, the peg is structurally defended by arbitrage. Anyone can buy the stablecoin below par and redeem it for full value, which pulls the price back up. The redemption path is what makes the peg credible.
If the answer is no, the peg depends on market psychology and the willingness of buyers to step in. That is a much weaker defence and historically breaks under stress.
This is the single test that cuts through marketing language. Issuers love to talk about "fully backed by cash and Treasuries" but the more useful question is: can you redeem one of these tokens for one dollar tomorrow if you wanted to? For most retail holders of most major stablecoins, the practical answer is no, you redeem through a venue (an exchange or DeFi protocol) which adds another layer of risk.
The Major Stablecoins You Will Actually See
The point of this section is context, not endorsement. These are the stablecoins you will encounter most often on exchanges and in DeFi.
The largest stablecoin by market capitalisation, with reported circulation in the hundreds of billions of dollars by 2026. Issued by Tether Limited. Backed primarily by US Treasury bills and cash equivalents. Reports issued quarterly through attestations rather than full audits, which is a long-standing point of criticism. Widely used across exchanges, particularly outside the US.
The second-largest fiat-backed stablecoin, with circulation in the tens of billions of dollars by 2026. Issued by Circle. Backed by cash and short-dated Treasuries held with regulated US banks. Generally considered the more compliance-aligned of the major fiat-backed stablecoins, with monthly attestation reporting. Briefly depegged in March 2023 when Silicon Valley Bank failed and Circle disclosed exposed reserves, recovering when the FDIC backstop was confirmed.
The largest crypto-collateralised stablecoin, issued by MakerDAO (now operating under the Sky ecosystem). Backed by a mix of crypto and real-world assets through smart contracts. Frequently mislabelled as algorithmic, but practically a collateralised system enforced by code. Used heavily in DeFi protocols.
Once a major fiat-backed stablecoin issued by Paxos. The New York Department of Financial Services directed Paxos to stop issuing new BUSD on 21 February 2023. The token has been in wind-down mode since, with circulation declining as holders redeem. Treat any "top stablecoin" list that still includes BUSD as outdated.
Other names you will see include PYUSD (PayPal), FDUSD (First Digital), TUSD, RLUSD (Ripple), and a growing set of bank-issued tokens emerging under the EU MiCA framework. The market structure is not static and the major players will shift over time.
Why Stablecoins Can Still Depeg
A stablecoin can trade meaningfully below par even when the long-term redemption value is intended to be par. Knowing why this happens is more useful than memorising which stablecoins are "safe", because the failure modes recur across different designs.
The lesson from past failures is consistent. Assume a run is structurally possible. Design your usage so that a depeg event does not cripple your position. The depeg risk explainer covers what a depeg actually signals and how to read one in real time.
Stablecoins are the cash layer of the cycle. How that capital is positioning, where stablecoin dominance sits in the broader cycle context, and what the data is signalling about positioning from here will be in the weekly member update.
See membership optionsHow Stablecoins Are Regulated In 2026
Stablecoins moved from being unregulated tokens to being explicitly defined and supervised products in major jurisdictions. The shift matters because it changes which stablecoins are accessible where, what reserve rules apply, and how much issuer-level risk the holder carries.
The European Union: MiCA
The Markets in Crypto-Assets Regulation (MiCA) is the EU's framework for crypto assets. The stablecoin provisions came into force in June 2024, ahead of the broader framework activation later that year. MiCA distinguishes two categories of stablecoin-like instruments: asset-referenced tokens (ARTs) and e-money tokens (EMTs).
EMTs are stablecoins pegged to a single official currency (such as the euro or US dollar) and must be issued by an authorised credit institution or e-money institution. ARTs are pegged to a basket or to non-currency references and have stricter authorisation, reserve, and disclosure requirements. Both categories are subject to authorisation, reserve management rules, redemption rights, and supervision.
The United States And Other Jurisdictions
The US has moved towards stablecoin legislation through multiple bills focused on payment stablecoin issuance, reserve requirements, and federal versus state oversight. The exact final regime varies by what passes and when. Other jurisdictions including the UK, Singapore, Hong Kong, and the UAE have introduced or expanded their own stablecoin regulatory frameworks, each with distinct rules.
A Stablecoin Safety Checklist
Use this checklist before parking meaningful size in any stablecoin. The order matters: get the first three right and most of the failure modes are mitigated.
Are reserves cash and short-dated government securities, or something with credit, liquidity, or duration risk? The cleaner the reserves, the more reliable the peg under stress.
Can you redeem at par, in what timeframe, with what fees, with what minimums, in your jurisdiction? If redemption is not realistic, the peg depends on market liquidity, not on backing.
Are reserves disclosed regularly, and is the disclosure independently verified? An attestation is a snapshot, an audit is full assurance. Know which one you are looking at.
Can the issuer freeze, blacklist, or claw back tokens? For most major fiat-backed stablecoins, the answer is yes, this is a feature for compliance and a risk for holders.
If you hold the stablecoin on an exchange, your risk becomes exchange solvency, not just stablecoin design. The two layers stack. Self-custody removes the venue layer but adds operational responsibility.
A stablecoin bridged from one network to another inherits the failure risk of the bridge. The bridged version is not the same asset as the native version. Bridges have historically been one of the highest-risk attack surfaces in crypto.
How did the stablecoin behave during sharp risk-off moves, banking system stress, or regulatory pressure? Past behaviour during stress is the most useful signal of future behaviour during stress.
If any of these are unclear, size down or pick a simpler alternative. There is no shortage of stablecoins.
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