A “stablecoin” is a type of cryptocurrency whose value is pegged to another asset class, such as a fiat currency or gold, to stabilize its price.

    Cryptocurrencies such as bitcoin and ether offer a number of benefits, and one of the most fundamental is not requiring trust in an intermediary institution to send payments, which opens up their use to anyone around the globe. But one key drawback is that cryptocurrencies’ prices are unpredictable and have a tendency to fluctuate, often wildly.

    This makes them hard for everyday people to use. Generally, people expect to be able to know how much their money will be worth a week from now, both for their security and their livelihood.

    Cryptocurrency’s unpredictability comes in contrast to the generally stable prices of fiat money, such as U.S. dollars, or other assets, such as gold. Values of currencies like the dollar do change gradually over time, but the day-to-day changes are often more drastic for cryptocurrencies, which rise and fall in value regularly.

    The following graph shows the price of bitcoin vs. the U.S. dollar (USD) compared to another fiat currency, the Canadian dollar (CAD), to see how much each currency fluctuates in relation.

    Stablecoins in a nutshell

    Stablecoins try to tackle price fluctuations by tying the value of cryptocurrencies to other more stable assets – usually fiat currencies. Fiat is the government-issued currency we’re all used to using on a day-to-day basis, such as dollars or euros.

    Usually, the entity behind a stablecoin will set up a “reserve” where it securely stores the asset or basket of assets backing the stablecoin – for example, $1 million in an old-fashioned bank (the kind with branches and tellers and ATMs in the lobby) to back up one million units of a stablecoin.

    This is one way digital stablecoins are pegged to real-world assets. The money in the reserve serves as collateral for the stablecoin – meaning whenever a stablecoin holder wishes to cash out their tokens, an equal amount of whichever asset backs it is taken from the reserve.

    There is a more complex type of stablecoin that is collateralized by other cryptocurrencies rather than fiat yet still is engineered to track a mainstream asset like the dollar.

    Maker, perhaps the most famous stablecoin issuer that uses this mechanism, accomplishes this through a service called “Vault” (formerly known as a Collateralized Debt Position), which locks up a user’s cryptocurrency collateral. Then, once the smart contract knows the collateral is secured, a user can use it to borrow freshly minted dai, the stablecoin.

    A third variety of stablecoin, known as an algorithmic stablecoin, isn’t collateralized at all; instead, coins are either burned or created to keep the coin’s value in line with the target price. Let’s say the stablecoin drops from the target price of $1 to $0.75. The algorithm will automatically burn a tranche of coins to introduce more scarcity, pushing up the price of the stablecoin. This type of stablecoin protocol is difficult to get right and has been tried and has failed several times over recent years. Yet, entrepreneurs keep trying.

    One of the few working examples using this model to date is known as UST created by blockchain project Terra.

    Types of stablecoin collateral

    Using this framework, stablecoins come in a range of flavors, and the collateralized stablecoins use a variety of types of assets as backing:

    • Fiat: Fiat is the most common collateral for stablecoins. The U.S. dollar is the most popular among fiat currencies, but companies are exploring stablecoins pegged to other fiat currencies as well, such as BiLira, which is pegged to the Turkish lira.
    • Precious metals: Some cryptocurrencies are tied to the value of precious metals such as gold or silver.
    • Cryptocurrencies: Some stablecoins even use other cryptocurrencies, such as ether, the native token of the Ethereum network, as collateral.
    • Other investments: Tether’s USDT was once supposed to be backed 1-for-1 with dollars but its collateral mix has shifted over time, and in a breakdown provided in 2021 the company said nearly half its reserves are in commercial paper, a form of short-term corporate debt. It has not disclosed the issuers of this paper but claims it is all rated A-2 or higher (A-2 is the second-best grade available for a corporate borrower from credit rating agencies like Standard & Poor’s). Circle’s USDC, similarly, lists unspecified “approved investments” alongside accounts at federally insured banks (notably, it does not say whether the accounts themselves are insured) in its monthly disclosures.

    What are the most popular stablecoins?

    To give you a taste of the experimentation happening in stablecoin land, let’s run through some of the most popular stablecoins.

    Diem

    Diem (formerly known as Libra) is a stablecoin in the works, originally conceived by the powerful, worldwide social media platform Facebook. While libra hasn’t launched, it’s had more psychological impact than any other stablecoin.

    Governments, notably China’s, are now exploring their own crypto-inspired digital currencies, in part because they’re worried diem would be a competitive threat because Facebook is a multinational company with billions of users from across the globe.

    Initially, the Diem Association, the consortium set up by Facebook, said Diem would be backed by a “basket” of currencies, including the U.S. dollar and the euro. But due to global regulatory concerns, the association has since backed off from its ambitious original vision. Instead, it is now planning to focus on developing multiple stablecoins, each backed by a separate national currency.

    Its first stablecoin, the diem dollar, was expected to launch as early as January 2021.

    Tether

    Tether (USDT) is one of the oldest stablecoins, launched in 2014, and is the most popular to this day. It’s one of the most valuable cryptocurrencies overall by market capitalization.

    The primary use case for USDT is moving money between exchanges quickly to take advantage of arbitrage opportunities when the price of cryptocurrencies differs on two exchanges; traders can make money on this discrepancy. But it has found other applications: Chinese importers stationed in Russia have also used USDT to send millions of dollars worth of value across the border, bypassing strict capital controls in China.

    Tether Ltd. the company that issues USDT, was embroiled in a 22-month legal battle with the New York Attorney General over allegations Bitfinex (a sister company of Tether) tried to cover up an $850 million shortfall using funds taken from Tether.

    Eventually, the case was settled on Feb. 23, 2021, with Tether and Bitfinex forced to pay $18.5 million and submit quarterly reports showing Tether’s stablecoin reserves for the next two years.

    USD Coin

    Launched in 2018, USD Coin is a stablecoin managed jointly by cryptocurrency firms Circle and Coinbase through the Centre Consortium.

    Like tether before its shift towards a mix of collateral assets, USD Coin is pegged to the U.S. dollars with a circulating supply of almost $26 billion. By 2023, Circle stated in a recent investor presentation it anticipates the supply to touch $190 billion.

    On July 8, 2021, Circle announced plans to go public through a $4.5 billion SPAC merger deal with Concord Acquisition Corp. The news comes one month after Circle closed a $440 million funding round involving big industry names such as FTX, Digital Currency Group (the parent company of CoinDesk) and Fidelity Management and Research Company.

    Dai

    Running on the MakerDAO protocol, dai is a stablecoin on the Ethereum blockchain. Created in 2015, dai is pegged to the U.S. dollar and backed by ether, the token behind Ethereum.

    Unlike other stablecoins, MakerDAO intends for dai to be decentralized, meaning there’s no central authority trusted with control of the system. Rather, Ethereum smart contracts – which encode rules that can’t be changed – have this job instead.

    There are still problems with this innovative model, however; for example, if the smart contracts underpinning MakerDAO don’t work exactly as anticipated. Indeed, they were gamed in 2020, leading to losses of $8 million.

    Do stablecoins have any drawbacks?

    There are a few drawbacks to stablecoins to keep in mind. Because of the way stablecoins are typically set up, they have different pain points than other cryptocurrencies.

    If the reserves are stored with a bank or some other third party, another vulnerability is counterparty risk. This boils down to the question: Does the entity really have the collateral it claims to have? This has been a question frequently posed to Tether, for instance, over whether it maintains a true 1-1 backing between USDT tokens and U.S. dollars.

    In the worst-case scenario, it’s possible the reserves backing a stablecoin could turn out to be insufficient to redeem every unit, potentially shaking confidence in the coin.

    Cryptocurrencies were created to replace intermediary companies that are typically trusted with a user’s money. By their nature, intermediaries have control over that money; for example, they are typically able to stop a transaction from occurring. Some stablecoins add the ability to stop transactions back into the mix.

    USD coin openly has a back door to stop payments if coins are used in an illicit manner. Circle, one of the firms behind USDC, confirmed in July 2020 that it froze $100,000 of the stablecoin at the behest of law enforcement.

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