A stablecoin is a crypto token designed to hold a steady value against a reference asset, most often one US dollar, while circulating on a blockchain like any other token. Stability does not come from the blockchain itself: it comes from a stabilization mechanism, such as cash reserves held by an issuer, crypto collateral locked in smart contracts or, in the riskiest designs, an algorithm.
Stablecoins sit between traditional money and crypto & blockchain networks. They are used for trading, cross-border transfers, settlement in DeFi and as a unit of account on chains where other assets fluctuate. Their usefulness depends entirely on how credibly they maintain the peg and honor redemption.
How a stablecoin keeps its peg
A stablecoin keeps its peg through two forces: redemption and arbitrage. If holders can reliably exchange one token for one dollar of value, any market price below the peg creates a profit opportunity for arbitrageurs who buy cheap tokens and redeem them. Any price above the peg invites new issuance. These flows pull the market price back toward the target.
The strength of this loop depends on the quality of what stands behind the token and on who may redeem. Many issuers allow direct redemption only for verified institutional customers, often with minimum amounts, so retail users rely on secondary markets. During stress, the peg is only as firm as the reserves are liquid, segregated and verifiable.
The table below summarizes the parameters that determine how firmly a stablecoin holds its value.
| Parameter | What it describes | Why it matters |
|---|---|---|
| Reserve composition | Cash, Treasury bills, repos or other assets | Determines liquidity under stress |
| Collateral ratio | Value of backing relative to supply | Buffer against asset price drops |
| Redemption access | Who can redeem, minimums and fees | Drives arbitrage that restores the peg |
| Reserve reporting | Attestations or audits and their frequency | Lets holders verify backing |
| Custody and segregation | Where reserves are held and in whose name | Protects holders if the issuer fails |
Types of stablecoins
Stablecoins are grouped by what backs them. The backing model decides who carries the risk, how the token can fail and how it is regulated.
| Type | Backing | Main risk | Example design |
|---|---|---|---|
| Fiat-backed | Cash and short-term government debt held by an issuer | Issuer, bank or custody failure | USDC, Tether |
| Crypto-collateralized | Over-collateralized crypto in smart contracts | Collateral crash and liquidation cascades | DAI-style vaults |
| Algorithmic | Supply rules and a companion token | Reflexive collapse when confidence falls | Former TerraUSD |
| Commodity-backed | Physical gold or other commodities | Custody and audit of the commodity | Gold-linked tokens |
| Yield-bearing | Reserves whose income passes to holders | Regulatory treatment and strategy risk | Tokenized money funds |
Fiat-backed stablecoins dominate circulating supply. Crypto-collateralized stablecoins avoid a central issuer but require collateral worth well above the debt, commonly 150 percent or more depending on the asset. Purely algorithmic stablecoins proved fragile: the collapse of TerraUSD in May 2022 showed how a design without hard reserves can enter a self-reinforcing death spiral within days.
Stablecoins compared with other forms of digital money
A stablecoin is privately issued digital money on a public or permissioned ledger. It is often confused with a central bank digital currency or with a bank deposit, but the issuer, legal claim and risk profile differ.
| Feature | Stablecoin | CBDC | Bank deposit |
|---|---|---|---|
| Issuer | Private company or protocol | Central bank | Commercial bank |
| Legal claim | Against issuer or reserves, varies by law | Direct central bank liability | Against the bank |
| Ledger | Usually a public blockchain | Central bank system | Bank ledger |
| Deposit insurance | Generally none | Not needed | Usually yes, up to a limit |
| Programmability | Native through smart contracts | Depends on design | Limited |
Stablecoins also differ from volatile cryptocurrencies such as bitcoin, whose value floats freely. The goal of a stablecoin is not appreciation but predictable purchasing power on-chain, which is why it often serves as the quote asset in trading pairs and lending markets.
How regulation treats stablecoins
Regulators now treat large stablecoins as payment instruments that need bank-like safeguards. The central requirements recur across jurisdictions: full reserves in safe liquid assets, segregation, regular disclosure and a right of redemption at par.
- European Union: MiCA distinguishes e-money tokens, referenced to a single official currency, from asset-referenced tokens that track baskets or other assets. Issuers need authorization, and e-money token holders have a claim to redemption at par value.
- United States: the GENIUS Act, enacted in 2025, created a federal framework for payment stablecoins with reserve, disclosure and issuer licensing requirements.
- Other jurisdictions: several financial centers, including Singapore, Hong Kong and the United Kingdom, have introduced or proposed dedicated stablecoin regimes.
Rules also shape design. Some regimes restrict paying interest directly to holders of payment stablecoins, which influences how yield-bearing stablecoins are structured and where they can be offered.
Risks and failure modes
A depeg occurs when the market price moves materially away from the target. Most depegs are brief, but they reveal which design weakness is under stress. The table links typical failures to their causes.
| Failure mode | Typical cause | Warning sign |
|---|---|---|
| Reserve shock | Reserves trapped at a failing bank | Sudden discount on secondary markets |
| Liquidity run | Mass redemptions exceeding liquid reserves | Rising redemption queues or delays |
| Collateral cascade | Sharp drop in crypto collateral prices | Wave of vault liquidations |
| Confidence spiral | Algorithmic design without hard backing | Companion token falling with the peg |
| Freeze or blacklist | Issuer blocks addresses by legal order | Tokens immovable at a specific address |
A notable example of a reserve shock came in March 2023, when USDC traded well below one dollar for several days after part of its reserves was held at Silicon Valley Bank. The peg recovered once access to the deposits was assured. Holders should also note that issuer-controlled stablecoins can freeze tokens, a feature used for sanctions compliance and theft recovery.
The idea in brief
Think of a stablecoin as a digital voucher worth one dollar that can travel on a blockchain. Someone keeps real money or other assets in reserve so that each voucher can, in principle, be swapped back for a dollar.
That promise is the whole point. If the reserves are real, safe and easy to reach, the voucher stays worth a dollar. If people start to doubt the reserves, they rush to sell or redeem, and the price can slip below its target.
A practical scenario
A software contractor in one country invoices a client abroad for 4,000 dollars. A traditional international wire would take two to three business days and pass through correspondent banks with fees on both ends.
Instead, the client sends 4,000 units of a fiat-backed stablecoin to the contractor’s wallet on a low-fee blockchain network. The transfer settles in minutes for a network fee of a few cents. The contractor then sells the tokens on a regulated exchange for local currency, paying the exchange’s conversion fee.
The outcome is faster settlement, but not a risk-free one. Before agreeing to this method, both sides check that the chosen token is issued under a recognized regulatory regime, publishes regular reserve reports and is supported on the network each wallet uses.