Skip to main content
COINSCIPHER
Subscribe
DeFi · DeFi

What are stablecoins? Types, uses, and risks explained

Stablecoins are cryptocurrencies pegged to a stable asset — usually the US dollar. Here's the difference between fiat-backed, crypto-backed, and algorithmic stablecoins.

By Eric Nkando, senior writer · 2 min read · Updated 14 Sep 2026
XLinkedIn

Answer first

Stablecoins are cryptocurrencies designed to maintain a stable value, usually pegged to the US dollar. They serve as the "cash" position within crypto, enabling trading, lending, transfers, and DeFi participation without fiat off-ramping. Total stablecoin market cap is measured in the hundreds of billions and continues to grow.

Fiat-backed stablecoins

Backed by real dollars (and short-duration Treasuries) held at regulated financial institutions. The issuer maintains reserves equal to circulating supply and users can redeem for dollars.

Examples: USDT (Tether), USDC (Circle), FDUSD (First Digital), USDe (Ethena — synthetic variant), PYUSD (PayPal).

Risks: reserve quality (audit vs attestation), issuer trust, regulatory action, temporary depegs during banking stress.

Crypto-backed stablecoins

Backed by other cryptocurrencies (ETH, BTC) held in smart contracts. Over-collateralized (e.g., $150 of ETH backing $100 of stablecoin) to absorb price volatility.

Examples: DAI/USDS (Sky, formerly MakerDAO), LUSD (Liquity), GHO (Aave).

Risks: collateral volatility (a crash in collateral price forces liquidations), smart contract risk, oracle risk, governance risk.

Algorithmic stablecoins

Maintain peg through algorithmic mechanisms — supply expansion and contraction based on demand — without direct 1:1 backing.

Examples: FRAX (partial-algorithmic), USDe (Ethena — technically synthetic via delta-neutral hedge, not pure algorithmic).

Risks: historically catastrophic. Terra's UST collapsed to zero in May 2022 after losing peg. Post-Terra, pure algorithmic stablecoins are viewed with strong skepticism.

What stablecoins are used for

  • Trading: most crypto pairs quote against a stablecoin (USDT- or USDC-quoted markets)
  • Cross-border transfers: USDT-on-Tron is one of the cheapest ways to send dollars globally
  • DeFi lending yield: lend stablecoins on Aave, Compound, etc. for interest
  • Ballast during volatility: hold stablecoins to preserve value during crypto drawdowns
  • On-chain payments: growing use for merchant acceptance, payroll, remittances

Which to use

  • US regulatory posture matters: USDC (regulated issuer, monthly attestations)
  • Global liquidity and cross-border: USDT (deepest market, cheapest on Tron)
  • Decentralization: DAI/USDS (crypto-collateralized, not issued by a centralized company)
  • Higher yield with tolerable risk: USDe or savings-rate USDS

Frequently asked questions

What are the main types of stablecoins?
Three types: (1) Fiat-backed — backed 1:1 by cash + Treasuries (USDT, USDC). (2) Crypto-backed — over-collateralized with crypto (DAI, LUSD). (3) Algorithmic — maintain peg via algorithmic mechanisms (rare after Terra's collapse; Ethena uses a delta-neutral hedge).
Are stablecoins safe?
Fiat-backed stablecoins are safer than most crypto but not risk-free — USDC briefly depegged during SVB in 2023. Crypto-backed stablecoins add smart contract and collateral volatility risk. Algorithmic stablecoins have failed catastrophically (Terra UST in 2022).
Why use stablecoins?
As a stable trading unit inside crypto (avoid on/off-ramping to fiat for every trade), for cross-border transfers (USDT on Tron is one of the cheapest global money-transfer rails), for DeFi lending yield, and as a ballast during crypto volatility.