A hard peg is a fixed exchange rate arrangement where one currency or asset is set to equal a specific value of another reference asset, with minimal allowed deviation. In crypto, the term is most often used to describe stablecoins or tokenized assets designed to track a fiat currency like the US dollar, or a basket of assets, at a fixed rate.
How hard pegs work in crypto
In traditional finance, hard pegs are typically enforced by a central authority that commits to maintain the fixed rate through policy tools and reserves. The classic example is a government fixing its currency to a larger, widely used currency to reduce volatility and improve predictability in trade.
In crypto markets, the same concept appears through mechanisms that aim to keep a token’s market price anchored to its target. A stablecoin targeting 1 USD is attempting a hard peg. To defend that peg, issuers may hold reserves such as cash and short-term government debt, or use on-chain collateral and rules that manage issuance and redemptions. The ability for users to mint or redeem tokens at the target rate can create arbitrage incentives that pull the market price back toward the peg when it drifts.
Hard peg vs. softer pegs and why it can break
A hard peg implies tight tracking, not just a general relationship. Softer pegs or managed bands tolerate wider fluctuations, while a hard peg aims for near-parity most of the time.
Even with strong design, pegs can fail if reserves are insufficient, collateral loses value, liquidity dries up, or confidence collapses. In those moments, a stablecoin can trade above or below its target, and restoring the peg may require recapitalization, changes to redemption terms, or a shift in mechanism.
Hard pegs matter in crypto because they underpin stablecoins used for payments, trading pairs, lending, and DeFi accounting, making price stability a core building block of many blockchain applications.