What is an algorithmic stablecoin? How does it stay stable?

Algorithmic stablecoins maintain stability through supply adjustments and arbitrage, but face challenges like volatility and regulatory uncertainty.

Apr 16, 2025 at 08:28 am

An algorithmic stablecoin is a type of cryptocurrency designed to maintain a stable value relative to a specific asset, usually a fiat currency like the US dollar, through the use of algorithms and smart contracts rather than being backed by traditional collateral such as other cryptocurrencies or physical assets. The stability of an algorithmic stablecoin is achieved through a variety of mechanisms that adjust the supply of the stablecoin in response to changes in demand, thereby maintaining its peg to the target asset.

Types of Algorithmic Stablecoins

Algorithmic stablecoins can be categorized into different types based on their mechanisms for maintaining stability. The two main types are rebasing stablecoins and seigniorage shares stablecoins.

• Rebasing Stablecoins: These stablecoins adjust the total supply of tokens held by users automatically and periodically to maintain the peg. For instance, if the value of the stablecoin falls below the target peg, the protocol might increase the supply of tokens to each holder, thereby diluting the value per token and bringing it back to the peg. Conversely, if the value rises above the peg, the protocol might decrease the supply.

• Seigniorage Shares Stablecoins: These operate by issuing new tokens or shares when the stablecoin's value is above the peg and buying back and burning tokens when the value is below the peg. This mechanism aims to balance supply and demand to maintain the stablecoin's value. Seigniorage shares can be thought of as a form of equity in the stablecoin's ecosystem, with holders potentially receiving dividends or other benefits.

How Algorithmic Stablecoins Maintain Stability

The stability of algorithmic stablecoins is maintained through a combination of economic incentives and algorithmic adjustments. Here are the key mechanisms involved:

• Supply and Demand Adjustments: The core principle behind algorithmic stablecoins is the manipulation of the token supply to counteract fluctuations in demand. If demand decreases and the value of the stablecoin drops below the peg, the algorithm might reduce the supply to increase the value per token. Conversely, if demand increases and the value rises above the peg, the algorithm might increase the supply to bring the value back down.

• Rebasing Mechanism: In rebasing stablecoins, the total supply of tokens is adjusted periodically. This can be done through a process called "rebasing," where each holder's balance is automatically increased or decreased. For example, if the stablecoin is trading below the peg, the protocol might increase the total supply by 1% for all holders, thereby diluting the value per token and bringing it closer to the peg.

• Seigniorage Mechanism: Seigniorage shares stablecoins use a different approach. When the stablecoin's value is above the peg, the protocol can issue new tokens or shares, which are sold to investors. The funds raised from these sales can be used to buy back and burn tokens when the value falls below the peg, thereby reducing the supply and increasing the value per token.

• Arbitrage Opportunities: Algorithmic stablecoins often create arbitrage opportunities that help maintain their peg. If the stablecoin trades below the peg, traders can buy the stablecoin at a discount and convert it into the target asset (e.g., US dollars) at the pegged rate, making a profit and reducing the supply of the stablecoin in circulation. Conversely, if the stablecoin trades above the peg, traders can sell the stablecoin and buy the target asset, increasing the supply of the stablecoin and bringing its value back down.

Examples of Algorithmic Stablecoins

Several algorithmic stablecoins have been developed, each with its unique approach to maintaining stability. Here are a few notable examples:

• Ampleforth (AMPL): Ampleforth is a rebasing stablecoin that adjusts its supply daily based on the price of the token. If the price is above the target peg, the supply is reduced, and if it's below, the supply is increased. This mechanism aims to keep the value of each AMPL token stable over time.

• Basis Cash (BAC): Basis Cash is a seigniorage shares stablecoin that uses a combination of three tokens to maintain its peg: BAC (the stablecoin), B shares (which entitle holders to a portion of the seigniorage), and bonds (which are used to buy back and burn BAC when the price is below the peg). This system aims to maintain the value of BAC at $1 through supply adjustments.

• Terra (UST): Terra is an algorithmic stablecoin that uses a different approach called a "decentralized stablecoin protocol." It maintains its peg through a combination of supply adjustments and a sister token called Luna. When the value of UST falls below $1, users can burn Luna to mint new UST, increasing the supply and bringing the value back to the peg. Conversely, when the value rises above $1, users can burn UST to mint new Luna, reducing the supply of UST and bringing its value back down.

Challenges and Risks of Algorithmic Stablecoins

While algorithmic stablecoins offer an innovative approach to maintaining stability, they also come with several challenges and risks:

• Volatility: Despite their design, algorithmic stablecoins can still experience significant volatility, especially during periods of high market stress. The algorithms may not always be able to adjust the supply quickly enough to counteract rapid changes in demand.

• Complexity: The mechanisms used by algorithmic stablecoins can be complex and difficult for the average user to understand. This complexity can lead to confusion and mistrust, especially if the stablecoin fails to maintain its peg.

• Regulatory Uncertainty: Algorithmic stablecoins operate in a regulatory gray area, and their legal status can vary significantly from one jurisdiction to another. This uncertainty can pose risks for both issuers and users of these stablecoins.

• Dependence on Market Participants: The success of algorithmic stablecoins often depends on the actions of market participants, such as arbitrageurs and traders. If these participants fail to engage in the necessary arbitrage activities, the stablecoin may struggle to maintain its peg.

Use Cases for Algorithmic Stablecoins

Algorithmic stablecoins have a variety of potential use cases within the cryptocurrency ecosystem:

• Payments and Transactions: Due to their stability, algorithmic stablecoins can be used as a medium of exchange for everyday transactions, both online and offline. They offer a more stable alternative to volatile cryptocurrencies like Bitcoin and Ethereum.

• Decentralized Finance (DeFi): Algorithmic stablecoins play a crucial role in the DeFi ecosystem, where they are used as collateral for loans, as a unit of account for lending and borrowing platforms, and as a stable store of value for yield farming and other DeFi applications.

• Hedging and Risk Management: Investors can use algorithmic stablecoins to hedge against the volatility of other cryptocurrencies. By holding a portion of their portfolio in stablecoins, investors can reduce their exposure to market fluctuations.

• Cross-Border Remittances: Algorithmic stablecoins can facilitate faster and cheaper cross-border remittances, as they can be transferred quickly and at a lower cost than traditional financial systems.

Frequently Asked Questions

Q: Can algorithmic stablecoins be used as a store of value?

A: Yes, algorithmic stablecoins can be used as a store of value due to their stability. However, their effectiveness as a store of value depends on the robustness of the underlying algorithm and the ability of the protocol to maintain the peg over time.

Q: Are algorithmic stablecoins decentralized?

A: Many algorithmic stablecoins are designed to be decentralized, meaning they operate on blockchain networks without the need for a central authority. However, the degree of decentralization can vary, and some stablecoins may have centralized elements, such as governance or reserve management.

Q: How do algorithmic stablecoins compare to other types of stablecoins?

A: Algorithmic stablecoins differ from other types of stablecoins, such as collateralized stablecoins (which are backed by other cryptocurrencies or assets) and fiat-backed stablecoins (which are backed by traditional fiat currencies). Algorithmic stablecoins rely solely on algorithms and smart contracts to maintain their peg, whereas collateralized and fiat-backed stablecoins use external assets to ensure stability.

Q: What happens if an algorithmic stablecoin loses its peg?

A: If an algorithmic stablecoin loses its peg, the protocol will attempt to adjust the supply of tokens to bring the value back to the target peg. However, if the algorithm fails to do so, the stablecoin may experience significant volatility, and its value may deviate further from the peg. In extreme cases, this could lead to a loss of confidence in the stablecoin and a potential collapse of its value.