Stablecoins: The Settlement Layer Between Crypto and Cash
A stablecoin is a token designed to hold a constant value against a reference asset — almost always the US dollar or the euro. That single property makes it the workhorse of crypto markets: it is the quote currency for most trading pairs, the way value moves between exchanges in minutes rather than days, and the parking spot traders use between selling an asset and actually receiving money in a bank account.
Three Designs, Three Failure Modes
Stablecoins are not one product. They differ in what backs the peg, and therefore in how they break.
Fiat-Backed (USDT, USDC, EURC)
An issuer holds cash and short-term government debt in reserve and mints one token per unit held. The peg holds because the issuer promises redemption at par. These dominate by volume, and their risk is concentrated in the issuer: reserve quality, redemption access, and the banks holding the cash. When USDC briefly traded near $0.88 in March 2023, nothing was wrong with the token — its reserves were partly held at a bank that had just failed.
Crypto-Collateralized (DAI and similar)
The peg is defended by over-collateralization: lock up more value in crypto than the stablecoins you mint, with automated liquidation if the collateral falls. No bank is involved, but the collateral itself is volatile, so these depend on liquidations clearing fast enough during a crash.
Algorithmic
The peg is maintained by a mint-and-burn mechanism rather than reserves. The design has repeatedly failed under stress — TerraUSD's collapse in May 2022 erased roughly $40 billion in days when the mechanism entered a reflexive spiral. Treat any purely algorithmic peg as an experiment, not as cash.
| Design | Backed By | Primary Risk |
|---|---|---|
| Fiat-backed | Cash and T-bills held by an issuer | Issuer, reserve, and banking risk |
| Crypto-collateralized | Over-collateralized on-chain assets | Collateral crash, liquidation failure |
| Algorithmic | A mint/burn mechanism only | Reflexive depeg spiral |
Why Off-Rampers Use Them
Selling crypto and receiving fiat are two separate events, and they rarely happen at the same speed. The market moves in seconds; a bank transfer settles in a day or three, and a compliance review can take longer. Converting to a stablecoin closes the price exposure immediately, leaving the slow part — the off-ramp to your bank — to happen on its own schedule.
This is also why stablecoins solve a practical banking problem. Many banks flag direct crypto-exchange deposits, and some exchanges price direct BTC-to-fiat withdrawals worse than a two-step route. Selling into USDT or USDC first, then off-ramping the stablecoin, is frequently both cheaper and less likely to trigger a hold.
Practical Risks
- Network mismatch. USDT exists on Ethereum, Tron, Solana, and others. Sending on a chain the recipient does not support is the most common way people lose stablecoins outright.
- Depeg is real but usually brief. Fiat-backed pegs have recovered from every major wobble so far; that is history, not a guarantee.
- Freezing. Centrally issued tokens can be frozen at the contract level, and issuers do comply with law-enforcement requests.
- Yield is not free. A double-digit return on a "stable" asset means someone is taking risk with it — usually you.
Before you move size: confirm the network, send a small test first, and check the token contract address against a second independent source. On a swap, verify you are routing to the stablecoin you intend — lookalike tickers are a standard scam.
Used as intended, a stablecoin is plumbing: it decouples the timing of your trade from the timing of your bank, and it lets you hold a dollar-denominated balance without leaving the chain. It is not a savings account, and the peg is a promise from someone rather than a law of nature. Read the off-ramp guide for how to turn that balance into money you can spend.