What Is a Stablecoin and How Does It Work?

Last Updated: June 2026

Crypto markets are famous for violent price swings — Bitcoin can move 10% in a single hour and altcoins even faster. Stablecoins exist to solve that problem. A stablecoin is a cryptocurrency designed to maintain a consistent value, almost always pegged to a fiat currency like the US dollar. Whether you are parking profits between trades, paying for goods without FX exposure, or providing liquidity on a crypto exchange, stablecoins act as the calm layer underneath a turbulent market. Understanding how they work — and where they can fail — is essential knowledge for any active trader.

How Stablecoins Maintain Their Peg

The word "stable" describes the goal, not a single mechanism. There are three distinct engineering approaches, each with its own risk profile.

Fiat-backed stablecoins are the simplest. The issuer holds dollars (or treasuries, commercial paper, or other short-term assets) in off-chain bank accounts and mints one token for every dollar held. USDT (Tether) and USDC (Circle) work this way. The peg holds as long as users trust that the reserves actually exist and can be redeemed. Centralized custody is the main trade-off: the issuer can freeze addresses or face regulatory action.

Crypto-backed stablecoins replace fiat reserves with on-chain collateral. DAI, issued by the MakerDAO protocol, is the canonical example. To mint $100 worth of DAI, a user must lock significantly more than $100 in ETH or other approved assets — typically 150% or more. This over-collateralization creates a buffer so that a falling ETH price does not immediately leave DAI undercollateralized. If collateral drops below the liquidation threshold, smart contracts automatically sell it to repay the debt.

Algorithmic stablecoins attempt to hold the peg without collateral, relying instead on supply-and-demand mechanics and arbitrage incentives. When the price rises above $1, the protocol mints new supply to push it back down; when it falls below $1, it burns supply or offers yield incentives to reduce circulation. This model is elegant in theory but fragile under extreme sell pressure, as the 2022 collapse of TerraUSD (UST) demonstrated when it lost its peg completely and took the paired LUNA token to near zero.

Comparing the Major Stablecoin Types

| Type | Example | Collateral | Decentralized? | Key Risk | |------|---------|-----------|----------------|----------| | Fiat-backed | USDT, USDC | USD in bank | No | Issuer / regulatory | | Crypto-backed | DAI, crvUSD | ETH, BTC on-chain | Yes | Liquidation cascade | | Algorithmic | (UST — defunct) | None / token reflexivity | Yes | Death spiral | | Commodity-backed | XAUT (gold) | Physical gold | No | Custody, storage |

Fiat-backed stablecoins dominate trading volume precisely because institutional users accept their counterparty risk in exchange for simplicity. Crypto-backed coins appeal to DeFi users who want dollar exposure without relying on a centralized issuer. Commodity-backed tokens like XAUT (gold) fill a niche for users seeking non-dollar pegs.

Why Traders Use Stablecoins

Stablecoins are not just a safe-haven — they are an operational tool. In spot trading, pairing assets against USDT gives every trade a clear dollar value without conversion friction. In leverage trading and crypto futures, USDT-margined contracts let you calculate P&L, margin requirements, and liquidation prices in familiar dollar terms rather than in a volatile base asset.

Beyond trading, stablecoins enable yield farming, cross-border remittances with low fees, and on-chain payments. The same $1,000 USDC that settles a futures trade on Monday can be deposited into a lending protocol for yield on Tuesday — all without touching a bank.

Trading Stablecoins on EVEDEX

EVEDEX uses USDT and USDC as the primary settlement and margin currencies across its perpetual futures markets. When you open a position on any USDT-margined pair, your collateral, unrealized P&L, and realized gains are all denominated in stablecoins. This matters practically: you never need to convert profits back to fiat to know exactly what you made.

Key ways stablecoins integrate with EVEDEX's product suite:

1. Margin collateral — Deposit USDT or USDC as collateral and open long or short positions across dozens of perpetual pairs without holding the underlying asset.
2. Settlement currency — All P&L is settled in stablecoins. Profits stay on-platform and can immediately be deployed into new trades.
3. P2P trading — EVEDEX's P2P desk allows traders to buy USDT directly from other users, giving access to stablecoin liquidity without routing through a centralized fiat on-ramp.
4. Cross-margin efficiency — Because all pairs share the same stablecoin margin pool, profits in one position automatically offset losses in another without manual rebalancing.

Stablecoins also make risk management cleaner on EVEDEX. Knowing your collateral is $1-pegged means your liquidation price calculation is straightforward and does not shift because your margin asset itself is volatile.

What to Watch Out For

No stablecoin is entirely risk-free. Even the most transparent fiat-backed tokens can temporarily depeg during systemic market events — USDC briefly fell to $0.87 in March 2023 when its issuer held reserves at Silicon Valley Bank. Algorithmic designs carry structural fragility. Crypto-backed stablecoins can be hit by liquidation cascades during sharp market downturns.

For active traders, the practical guidelines are: use the most liquid and transparent stablecoin available for large positions (typically USDC or USDT), monitor reserve attestation reports from issuers, and do not treat any stablecoin as a substitute for FDIC-insured cash. Diversifying across two or three stablecoins is a simple hedge against single-issuer risk.

Understanding the mechanics behind stablecoins — not just that they "equal one dollar" — makes you a more informed trader and a more resilient participant in decentralized finance.