Most of the time, a stablecoin is boring by design. One USDC trades for one dollar, you barely think about it, and the token is just a unit of account you swap in and out of. A depeg is the moment that assumption breaks, even briefly, and the price on an exchange or a DEX moves away from that dollar target. It does not happen often, but when it does, it is worth understanding what is actually going on before reacting.
What a depeg actually means
A stablecoin's peg is a target, not a guarantee enforced by code. For a reserve backed stablecoin like USDC, the peg holds because the issuer, Circle, holds enough cash and short term US Treasuries to redeem every token for a dollar. As long as that redemption path works and people trust it, arbitrage keeps the market price close to one dollar. If large holders can redeem below a dollar, they buy up the cheap tokens and redeem them at par, which pushes the price back up.
A depeg happens when that trust or that redemption path is disrupted, even temporarily. The market price can drop to ninety cents or lower while the underlying reserves are still fully intact, simply because people are not sure they can get their dollar back right away.
Two depegs worth understanding
USDC, March 2023: a banking problem, not a reserve problem
On March 11, 2023, USDC fell to roughly $0.87 after Circle disclosed that $3.3 billion of its reserves, out of about $40 billion total, were held at Silicon Valley Bank, which had just been shut down by regulators. The issue was never that Circle's reserves had lost value. The issue was that a slice of those reserves was temporarily locked inside a failed bank over a weekend, so redemptions for that portion could not be guaranteed immediately.
The peg recovered once US regulators announced that all Silicon Valley Bank depositors, including Circle, would have full access to their funds. Within a couple of days, USDC was back to one dollar. The mechanism that caused the depeg was fixed by a banking decision, not by anything Circle changed about USDC itself.
UST, May 2022: a design problem
Terra's UST was a different kind of stablecoin, and its collapse is a different story. UST held its peg through an algorithm, not a reserve of dollars. It was designed so that UST could always be swapped for a related token called LUNA at a value of one dollar, and that swap mechanism was supposed to keep UST at one dollar no matter what.
In May 2022, large withdrawals from a lending protocol built on Terra started a wave of selling. As holders rushed to swap UST for LUNA, the protocol had to mint enormous amounts of new LUNA, which crashed its price. Once LUNA's total value fell below the total value of UST in circulation, the swap mechanism no longer had enough value behind it to redeem all the UST outstanding. UST fell to around $0.12 by May 16, 2022, and never recovered. Over $30 billion of value was destroyed in about a week.
Why the difference matters
These two events look similar on a chart, a stablecoin's price falling away from one dollar, but the underlying cause was completely different. USDC's depeg was a temporary liquidity and confidence problem around a real, redeemable reserve. UST's collapse exposed that there was no independent reserve at all, only a second token whose value depended on continued confidence in the same system. One recovered in days. The other went to zero and stayed there.
This is the single most useful question to ask about any stablecoin you hold: what actually backs it, and is that backing independent of the token's own market price? A stablecoin backed by cash and short term treasuries held at regulated custodians is a different kind of risk than one backed algorithmically by another token in the same ecosystem.
What to actually check if it happens to you
If a stablecoin in your wallet moves noticeably away from one dollar, a few things are worth checking before doing anything else.
First, confirm which token you actually hold and what backs it. Base has more than one stablecoin, and they are not all the same. Reserve backed tokens like USDC and EURC publish attestations about what backs them. Others may not.
Second, separate the price you see on a swap screen from the actual backing. During a fast moving depeg, DEX liquidity can thin out quickly, and the price you are quoted may overshoot the real situation in either direction simply because there are not enough buyers or sellers at that moment. That is a liquidity problem on the trading venue, not necessarily a statement about the underlying reserve.
Third, look for an official statement from the issuer rather than relying on social media sentiment. Circle's public communication during the SVB weekend is a good example of information that actually mattered, as opposed to speculation.
Fourth, resist swapping into a different asset out of panic. Selling a temporarily depegged, reserve backed stablecoin at a steep discount to buy something else can lock in a loss that would have reversed on its own, and moving into an unfamiliar token carries its own risks that may be less understood than the one you started with.
The takeaway
A depeg is rare, and for a well collateralized stablecoin it is usually temporary. But rare is not the same as impossible, and the two events above show that not all stablecoins fail for the same reason or recover the same way. Knowing what backs the stablecoins in your Base wallet, before anything goes wrong, is the part that actually helps when it does.
Sources: CoinDesk on the USDC depeg, CNBC on the SVB exposure, Forbes on the Terra death spiral, Richmond Fed economic brief on Terra.