How Crypto Pegs Work: Explaining the Mechanism Behind Stablecoins

Pegging in crypto refers to the process of tying a digital asset's price to an external benchmark, often the US dollar. This is what sets stablecoins apart from other cryptocurrencies like Bitcoin, whose price can fluctuate wildly.

Most pegged assets are built to maintain a one-to-one ratio with their target, whether it's a currency, gold, or another crypto asset. The most common setup involves tying an asset's price to the US dollar, but gold and BTC also anchor certain tokens.

The mechanism behind maintaining a stable value is called arbitrage. When a pegged asset slips from its target, traders buy the token at a discounted price, redeem it for the underlying reserve, and pocket the difference. This constant tug-of-war keeps most pegs anchored.

Four models come to mind when thinking about how crypto pegs work: fiat-backed, crypto-collateralized, commodity-backed, and algorithmic. Each model has its strengths and weaknesses, with some relying on cash or gold reserves while others rely on code-based supply and demand mechanisms.