Stablecoin Pegs Explained: Reserves and Arbitrage

Stablecoins aim to maintain a stable value, typically pegged to a fiat currency like the U.S. dollar. This stability is crucial for their utility in cryptocurrency trading and decentralized finance applications.

Two primary mechanisms underpin a stablecoin's peg. Firstly, most stablecoins are backed by reserves or collateral. This can include fiat currency held in traditional bank accounts, other cryptocurrencies, or even commodities. The value of these underlying assets is intended to match the total supply of the stablecoin, ensuring each token represents a claim on that value.

Secondly, an arbitrage process plays a vital role. Market participants can exploit temporary price deviations from the peg. If a stablecoin trades below its peg, arbitrageurs can buy the cheap tokens, redeem them for the equivalent value of the underlying collateral (often at par), and pocket the difference. Conversely, if the stablecoin trades above its peg, arbitrageurs can mint new tokens by supplying the required collateral, sell them at the higher market price, and profit. This constant buying and selling pressure helps to guide the stablecoin back to its intended peg.