A digital token with a reference value.
NIST describes a stablecoin as a fungible cryptocurrency token whose value is pegged to a currency, another asset or an index. The definition is intentionally broad because stablecoins can use very different legal and technical structures.1
Most large stablecoins reference the US dollar, but euro, Singapore-dollar and other currency products also exist. A token trading close to its reference price does not by itself establish who owes the holder money, what assets support the token or whether the holder can redeem directly with the issuer.
Stability comes from a system, not a ticker.
Three layers usually determine whether a stablecoin stays near its reference value:
Issuance and redemption
Who can create or redeem tokens, at what price, on which timetable and under which conditions.
Backing or stabilisation
Cash, securities, crypto collateral, hedges, protocol rules or another mechanism supports the peg.
Market liquidity
Exchanges, market makers and onchain pools absorb buying and selling between formal redemptions.
Operational access
Banks, custodians, blockchains, bridges and wallets determine whether the system works in practice.
The U.S. Treasury notes that fiat-backed tokens are generally minted against money received by an issuer and depend on a promise or expectation of redemption. Reserve composition, disclosure and direct access differ across arrangements.2
The label describes the mechanism, not the outcome.
| Model | Typical support | Primary question |
|---|---|---|
| Fiat-backed | Cash, deposits, Treasury bills or similar reserve assets | Can reserves meet redemptions at par and on time? |
| Crypto-backed | Onchain collateral, often with overcollateralisation and liquidation rules | How does the system behave when collateral prices fall quickly? |
| Synthetic or hedged | Crypto collateral combined with derivatives or other offsetting positions | Can the hedge, custody and liquidity stack survive stress? |
| Algorithmic | Rules and incentives that expand, contract or exchange token supply | What creates credible demand when confidence and liquidity decline? |
Scale is useful context, not a safety score.
The table below shows the largest assets in Stablrcoin's dated catalog snapshot. It is not a live trading feed and does not cover every stablecoin. Market cap is an estimate of circulating scale, not proof of reserve quality, redemption access or regulatory status.
| Asset | Issuer or protocol | Model | Market cap |
|---|---|---|---|
 Tether USDT | Tether Holdings | Fiat-backed | $183.33B |
 USD Coin USDC | Circle | Fiat-backed | $74.34B |
 Sky Dollar USDS | Sky Ecosystem | Crypto + RWA-backed | $6.47B |
 Dai DAI | Sky Ecosystem | Multi-collateral protocol token | $4.79B |
 World Liberty Financial USD USD1 | BitGo | Fiat-backed | $4.33B |
 Ethena USDe USDe | Ethena Labs | Synthetic dollar with dynamic backing strategies | $4.59B |
 Global Dollar USDG | Paxos Digital Singapore | Fiat-backed | $3.24B |
 PayPal USD PYUSD | Paxos Trust Company, N.A. | Fiat-backed | $2.76B |
Follow the claim from token to cash.
A stablecoin can hold its market price while still presenting legal, operational or access risks. The BIS highlights clear legal claims, reserve management and timely redemption as central elements of a robust arrangement.3
- Reserve and liquidity risk: supporting assets may lose value or be difficult to sell quickly enough for redemptions.
- Redemption risk: the holder may lack direct access, face minimums, fees, delays or jurisdictional restrictions.
- Issuer and custody risk: insolvency, banking disruption or unclear asset segregation can interrupt the claim.
- Technical risk: smart contracts, bridges, validators, oracles and wallet controls can fail independently of the reserve.
- Market risk: thin liquidity and concentrated venues can push the traded price away from the reference value.
Regulation increasingly focuses on licensing, reserve assets, redemption, governance, operational resilience and financial-crime controls, but the applicable framework still depends on the product and jurisdiction.4
Five questions before choosing a stablecoin.
- What is the reference asset and stabilisation mechanism? Start with what the token is designed to track and how the design responds when price moves away from that target.
- Who owes the redemption claim? Identify the legal issuer or protocol and whether your account has direct redemption access.
- What supports the token? Read reserve composition, custody, segregation, collateral rules and any hedging dependencies.
- How current is the evidence? Separate a dated attestation from a financial-statement audit and from a live onchain dashboard.
- Where will you hold and use it? Chain, bridge, exchange, wallet and card exposure can matter as much as the token design.
Continue with our reserve and attestation reading guide or compare stablecoin cards by eligibility, funding and fees.
Short answers, with the important limits intact.
What is a stablecoin?
A stablecoin is a digital token designed to maintain a target value relative to a reference asset, most often the US dollar. The word stable describes the objective of the mechanism, not a guarantee that its market price or redemption value cannot change.
How does a stablecoin stay near one dollar?
The mechanism depends on the design. Fiat-backed issuers hold reserve assets and issue or redeem tokens around par. Crypto-backed systems use collateral, liquidation rules and incentives. Synthetic designs combine collateral with hedges. Secondary-market liquidity also matters in every model.
Is a stablecoin the same as a bank deposit?
No. A stablecoin is not automatically a bank deposit and may not have deposit insurance. The holder's legal claim, access to direct redemption and protections in insolvency depend on the issuer, product terms, intermediaries and jurisdiction.
Which stablecoin is safest?
There is no universal answer. Compare the legal issuer, reserve quality, segregation and custody, redemption rights, disclosure cadence, smart-contract exposure, supported networks and the reliability of the intermediaries you will actually use.
What can cause a stablecoin to lose its peg?
Common pressure points include doubts about reserves, slow or restricted redemption, liquidity shortages, banking or custody disruption, smart-contract or bridge failures, collateral liquidation and breakdowns in a hedging strategy.
Primary references and data provenance.
- National Institute of Standards and TechnologyNIST IR 8408: Understanding Stablecoin Technology and Related Security Considerations ↗
- U.S. Department of the TreasuryReport on Stablecoins ↗
- Bank for International Settlements, CPMIConsiderations for the use of stablecoin arrangements in cross-border payments ↗
- Bank for International Settlements, Financial Stability InstituteStablecoins: regulatory responses to their promise of stability ↗
- DeFiLlamaStablecoins market overview ↗
The market table uses a dated DeFiLlama-based snapshot stored by Stablrcoin. Source links establish the basis for the displayed claim at the observation date. They do not turn a provider statement into an independent audit or a market-data snapshot into a live feed.