Explained: What Are Stablecoins, The Asset Rocking Crypto Market?

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Stablecoins have a market cap of around $170 billion.

Most cryptocurrencies have a major problem with price volatility, but one sub-category of coins is designed to maintain a constant value: stablecoins.

As cryptocurrency prices plummeted this week, with bitcoin losing around a third of its value in just eight days, stablecoins were supposed to be isolated from the chaos.

But an unexpected collapse in the fourth-largest stablecoin TerraUSD, which broke from its 1:1 dollar peg, has brought the asset class under renewed attention.

Here's what you need to know:

What Are Stablecoins?

Stablecoins are cryptocurrencies designed to be protected from the wild volatility that makes it difficult to use digital assets for payments or as a store of value.

They attempt to maintain a constant exchange rate with fiat currencies, for example through a 1:1 U.S. dollar peg.

How Important Are They?

Stablecoins have a market cap of around $170 billion, making them a relatively small part of the overall cryptocurrency market, which is currently worth around $1.2 trillion, according to CoinMarketCap data.

But they have surged in popularity in recent years. The largest stablecoin, Tether, has a market cap of around $80 billion, having surged from just $4.1 billion at the start of 2020.

The No.2 stablecoin, USD Coin, has a market cap of $49 billion, according to CoinMarketCap data.

While data on the specific uses of stablecoins is hard to come by, they play a crucial role for cryptocurrency traders, allowing them to hedge against spikes in bitcoin's price or to store idle cash without transferring it back into fiat currency.

In its biannual financial stability report on Tuesday, the U.S. Federal Reserve