What Are Stablecoins? USDT, USDC, and DAI Explained

October 15, 2026  ·  6 min read

Crypto markets are notoriously volatile — Bitcoin can swing 10% in a day, and smaller coins even more. Stablecoins solve this problem: they are cryptocurrencies designed to maintain a stable value, typically pegged 1:1 to the US dollar. They give crypto users the speed and programmability of blockchain technology without the price volatility.

The Three Main Types of Stablecoins

1. Fiat-Backed (USDT, USDC)

The simplest model: a company holds real dollars (or dollar-equivalent assets) in reserve and issues tokens representing those dollars. For every USDT or USDC in circulation, the issuer claims to hold $1 in reserve.

Tether (USDT) is the largest stablecoin by market cap — over $120 billion as of 2026. Created in 2014, it runs on multiple blockchains including Ethereum (ERC-20), Tron (TRC-20), Solana, and others. USDT is the most widely used trading pair on exchanges worldwide. Controversy: Tether has historically been opaque about its reserve composition, though recent audits show reserves primarily in US Treasury bills.

USD Coin (USDC) is issued by Circle, a regulated US financial company. USDC publishes monthly attestations of its reserves (held entirely in cash and short-term US Treasuries) and is widely considered more transparent than USDT. It runs on Ethereum, Solana, Arbitrum, Base, and other networks.

2. Crypto-Backed (DAI)

DAI, issued by the MakerDAO protocol, is backed by overcollateralized crypto assets. To mint $100 of DAI, a user must lock $150 or more of ETH (or other accepted collateral) in a smart contract. If the collateral value drops below a threshold, the position is automatically liquidated to protect the peg.

DAI is decentralized — no company controls it. It is governed by MKR token holders and operates entirely via smart contracts. The trade-off: it is more complex and slightly less capital-efficient than fiat-backed alternatives.

3. Algorithmic Stablecoins

Algorithmic stablecoins attempt to maintain a peg through supply-and-demand mechanisms rather than backing. TerraUSD (UST) was the most prominent example — until May 2022, when it catastrophically lost its peg, collapsing from $1 to near zero within days and wiping out approximately $40 billion in value. The UST collapse remains the most significant warning in crypto about the fragility of algorithmic pegs without adequate collateral backing.

Today, most algorithmic stablecoins have been abandoned or restructured with partial backing. The lesson: a stable peg requires real reserves.

Key Risks of Stablecoins

• De-pegging risk: Even fiat-backed stablecoins can briefly lose their peg during market stress. USDC briefly fell to $0.87 in March 2023 when Circle revealed $3.3B in reserves held at the failed Silicon Valley Bank — recovering once the FDIC guaranteed deposits.
• Counterparty risk (fiat-backed): You are trusting the issuing company to actually hold reserves and honor redemptions. Regulatory action against the issuer could freeze or block access to funds.
• Smart contract risk (crypto-backed): DAI and similar stablecoins depend on audited smart contracts. A bug could be exploited to drain the protocol.
• Regulatory risk: Stablecoin regulation is evolving rapidly in the US, EU, and other jurisdictions. Future laws could restrict how stablecoins are issued or used.

Stablecoin Use Cases

• Trading pairs: Most crypto trades are paired against USDT or USDC — they provide a stable unit of account without converting back to fiat
• DeFi yield: Supplying USDC to Aave or Compound earns interest; providing USDT/USDC liquidity to Curve earns trading fees
• Cross-border payments: Sending USDT on Tron costs under $1 and settles in seconds — far faster and cheaper than traditional wire transfers
• Stable storage during volatility: Converting BTC or ETH to USDT during a market downturn preserves value without exiting crypto entirely

How to Exchange Stablecoins

Exchange USDT or USDC to BTC, ETH, XMR, or any other coin instantly on FixedFloat. Supports USDT on multiple networks (ERC-20, TRC-20, Solana) and USDC across major chains. No registration, no KYC.