Stable Coins are crypto-assets designed to maintain a relatively stable value, usually against a fiat currency such as the US dollar. They can make blockchain-based payments, trading and decentralised finance easier, but “stable” describes a target—not a guarantee. Reserve quality, redemption rights, liquidity, technology and regulation all affect whether a token holds its peg.
What are stable coins?
A stablecoin is a digital token whose issuer or protocol uses reserves, collateral or market incentives to track a reference asset. Most major products target one US dollar, although tokens can reference other currencies, gold or baskets of assets. Stable Coins move on blockchains and can settle around the clock, but the claim behind a token varies widely.
This distinction matters. A bank deposit is a liability of a regulated bank and may receive deposit-insurance protection under local law. A central bank digital currency is a direct liability of a central bank. A stablecoin is neither automatically. Its holder depends on the issuer, reserve structure, smart contracts, intermediaries and applicable legal rights.
Four main types of stable coins
- Fiat-backed stable coins: an issuer holds cash and liquid financial assets intended to support redemption. USDC and USDT are prominent examples, but their issuers, reserve policies and legal terms differ.
- Crypto-collateralised stable coins: users lock crypto-assets in smart contracts, usually at more than 100% collateralisation. DAI emerged from this model, although its backing has evolved to include real-world assets and other stable coins.
- Commodity-backed tokens: the reference asset may be gold or another commodity held by a custodian. Token holders must assess custody, audits, fees and redemption conditions.
- Algorithmic or partially collateralised designs: software, incentives or paired tokens attempt to manage supply and demand. The collapse of TerraUSD showed that an algorithmic mechanism can fail rapidly when confidence and liquidity disappear.
How fiat-backed stable coins maintain a peg
In a conventional reserve-backed model, authorised customers mint tokens by providing fiat currency and redeem tokens for fiat at the stated rate. Arbitrage can help pull the market price towards the redemption value: traders buy below the peg or sell above it when reliable minting and redemption are available.
The mechanism depends on credible reserves and timely redemption. Circle, for example, publishes information about USDC reserves and monthly assurance reports. Disclosure is useful, but readers should still examine the reserve assets, custodians, eligible redeemers, fees and terms rather than treating every issuer as equivalent.
How crypto-backed stable coins work
Crypto-backed systems use on-chain vaults and overcollateralisation. If collateral falls below a required ratio, the protocol can liquidate it to protect the stablecoin. This design makes positions transparent on-chain, yet creates liquidation, oracle, smart-contract and governance risks. Our updated guide to MakerDAO and Sky explains how DAI, USDS, MKR and SKY now relate.
Why people use stable coins
- Trading: moving between crypto-assets without repeatedly using bank rails.
- Payments and remittances: transferring tokenised value across supported networks, sometimes outside banking hours.
- DeFi: supplying collateral, borrowing, providing liquidity or settling transactions.
- Treasury operations: managing blockchain-based balances and programmable payments.
- Dollar exposure: seeking a dollar-referenced asset where access to dollar accounts is limited, subject to local law.
These uses do not remove counterparty or market risk. A payment can also involve wallet providers, exchanges, bridges and multiple blockchains. Readers should review our guide to crypto wallets before holding tokens directly.
The main stablecoin risks
- Depegging: a token can trade above or below its target during stress.
- Reserve and credit risk: backing assets or counterparties may lose value or become inaccessible.
- Liquidity risk: redemptions may be delayed when markets or banking partners are under pressure.
- Legal risk: holders may not have a direct claim on reserves, and rules vary by jurisdiction.
- Operational risk: cyber incidents, custody failures, frozen addresses or service outages can interrupt access.
- Smart-contract and bridge risk: code defects or cross-chain representations can create losses beyond the issuer.
- Governance risk: administrators or token voters may change parameters, collateral or access controls.
The Financial Stability Board’s stablecoin recommendations emphasise governance, risk management, transparent disclosures, legal claims, effective stabilisation and timely redemption. Regulation is developing, but it is not uniform worldwide.
Stable Coins versus CBDCs
Stable Coins and central bank digital currencies should not be conflated. A CBDC is issued by a central bank and represents central-bank money in digital form. A private stablecoin is issued or governed by a company, foundation or decentralised protocol. Both may use digital infrastructure, but their issuers, legal status, risk and policy objectives are different.
A stablecoin due-diligence checklist
- Identify the issuer, governing protocol and exact blockchain contract.
- Read the redemption terms and confirm who can redeem directly.
- Review reserve composition, custody arrangements and assurance reports.
- Check recent market liquidity and historical deviations from the peg.
- Understand address-freezing, upgrade and governance powers.
- Assess wallet, exchange, bridge and smart-contract exposure.
- Confirm the tax and regulatory treatment in your jurisdiction.
- Avoid assuming a yield product has the same risk as simply holding the token.
The bottom line
Stable Coins can connect blockchain markets with familiar units of account, but designs differ materially. The strongest assessment starts with reserves, redemption rights, liquidity, technology and governance. Treat the peg as a mechanism to evaluate—not a promise that eliminates risk.
