Stablecoins have garnered much attention as a key part of the emerging decentralized finance (or “DeFi”) ecosystem, and as a potential way to pay for goods and services. Stablecoins facilitate trades on crypto exchanges, serve as the underlying asset for many crypto loans, and allow market participants to avoid inefficiencies stemming from converting back to fiat currency for crypto trades. They essentially serve as both a means of payment and store of value for these transactions. As the name suggests, stablecoins attempt to provide a stable value relative to other crypto assets by pegging their value to a real-world asset, known as the reference asset, such as the US dollar.¹ This is done through a stablecoin’s “stabilization mechanism,” the process by which a stablecoin maintains its peg against the real-world asset. Existing stablecoins today utilize a variety of stabilization mechanisms.

In this note we describe the general lifecycle of a stablecoin from its issuance to its redemption. We then categorize various stabilization mechanisms and discuss how they work in practice. A key observation is that, although several stablecoins may peg their value to the same real-world asset, stabilization mechanisms can vary greatly in terms of maintaining stability with the reference asset, and so may have varying susceptibilities to the risk of runs from the stablecoin to the reference asset.²