Types of Stablecoins: Fiat-Backed, Crypto-Collateralized, and Algorithmic

How the three categories of stablecoins work, their distinct risks, and how to assess if one is safe

2026-06-02

Stablecoins are cryptocurrencies pegged to fiat (usually USD) — the "cash" of crypto. But not all stablecoins are equally safe.

1. Fiat-backed (USDT, USDC) Each coin issued is backed by

(or equivalent assets) in reserve. The most mainstream and widely accepted. Risk: you must trust the issuer actually holds full reserves, and the quality of those reserves (cash vs commercial paper).

2. Crypto-collateralized (DAI) Minted against over-collateralized crypto — e.g. lock

50 of ETH to mint 100 DAI. Decentralized and verifiable on-chain. Risk: in extreme markets, collateral crashes can trigger liquidation spirals.

3. Algorithmic (mostly defunct) No collateral — relies on algorithms and arbitrage to hold the peg. The 2022 UST/LUNA collapse is the cautionary tale: once it lost the peg it entered a death spiral, wiping out tens of billions. Highest risk by far.

How to assess if a stablecoin is safe

Reserve transparency: are there regular audit reports?
Reserve composition: cash and short-term Treasuries beat opaque assets
De-peg history: has it stayed near
long-term?
Market cap and liquidity: larger is harder to manipulate

Practical advice Use mainstream USDT/USDC for daily needs, and avoid obscure stablecoins promising high yield — something that is both "stable" and pays high interest is a contradiction.

For reference only. Not financial advice.