Stablecoins are cryptocurrencies designed to maintain a stable value — usually pegged to the US dollar. One stablecoin token should always equal approximately $1. They've become essential infrastructure in crypto, used for trading, lending, transferring value, and parking funds during volatility. This guide explains how they work, the main types, and the risks.
Why Stablecoins Exist
Crypto's biggest barrier to everyday use is volatility. Bitcoin can swing 5% in a day. Ethereum can move 10%. This makes crypto impractical for: - Trading pairs: If you're selling an altcoin, you need to park the proceeds somewhere stable before buying something else - Transfers: Sending $1,000 internationally shouldn't require worrying about whether your coin will be worth $900 by the time it arrives - Earning yield: DeFi lending and borrowing need a stable unit of account - Parking funds: When the market is crashing, traders move into stablecoins to wait it out
Stablecoins solve this by being crypto-native (they move on blockchains, settle in minutes, and don't require a bank) while maintaining a stable value.
The Three Types of Stablecoins
1. Fiat-backed (centralized)
The issuer holds US dollars (or equivalent) in a bank account or treasury and issues tokens on a 1:1 basis. For every 1 USDC in circulation, Circle (the issuer) holds $1 in reserves. The token is redeemable — you can exchange it back for dollars.
This is the most common type. USDT (Tether) and USDC (Circle) are the two largest examples. The stability comes from the reserve backing.
2. Crypto-backed (decentralized)
The issuer holds crypto collateral in a smart contract and issues stablecoins against it. Because crypto is volatile, these stablecoins are overcollateralized — you need more collateral than the stablecoins you receive.
Example: DAI is backed by Ethereum and other crypto assets locked in MakerDAO smart contracts. To mint $100 DAI, you might need to lock up $150 worth of ETH. If the ETH price drops too far, the position gets liquidated.
3. Algorithmic (unbacked)
These use algorithms and arbitrage incentives to maintain the peg without collateral. They're the riskiest type — if the algorithm breaks, the stablecoin can collapse. The most famous failure was TerraUSD (UST), which lost its peg in May 2022 and went from $1 to $0.01 in days, wiping out $40 billion in value.
Algorithmic stablecoins are generally not recommended for beginners.
USDT vs USDC: The Two Giants
| Feature | USDT (Tether) | USDC (Circle) |
|---|---|---|
| Market cap | Largest stablecoin | Second largest |
| Issuer | Tether Limited | Circle (publicly traded) |
| Blockchain | Multi-chain (Ethereum, Tron, Solana, etc.) | Multi-chain (Ethereum, Solana, etc.) |
| Reserve transparency | Attorneys' letters, reduced reporting | Monthly attestations by Deloitte |
| Regulatory status | CFTC and DOJ scrutiny | Registered as money transmitter, more compliant |
| Adoption in DeFi | Widely used | Widely used |
| De-peg history | Brief de-pegs (2022), recovered | Brief de-peg during SVB collapse (March 2023), recovered |
USDT is the most widely used stablecoin globally, especially in Asia and on Tron network. It has a longer track record but more transparency concerns — Tether has been fined by the CFTC and has faced questions about its reserves.
USDC is more transparent and US-regulated. It publishes monthly reserve attestations and is backed by cash and short-term US Treasuries. It briefly de-pegged during the Silicon Valley Bank collapse in March 2023 (when $3.3 billion of its reserves were stuck at SVB), but recovered to $1 within days after the bank's depositors were made whole.
For beginners in the US, USDC is generally the safer choice due to its regulatory compliance and transparency. For international transfers, USDT on Tron is widely used due to low fees.
What Can You Do With Stablecoins?
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Trading: When you sell a crypto position, the proceeds often go into a stablecoin. You can then buy back in later without wiring money back to a bank.
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Earning yield: DeFi protocols like Aave and Compound let you lend stablecoins to earn interest. Rates fluctuate (typically 3-15% APY) and are not guaranteed. Learn about DeFi.
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Transfers: Sending USDC to someone costs a few cents on Layer 2 networks (Polygon, Arbitrum) and settles in seconds. Cheaper and faster than bank wires.
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Parking during volatility: When the market crashes, moving to stablecoins preserves your purchasing power. You can buy back in at lower prices without withdrawing to a bank.
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Cash-out bridge: To convert crypto to fiat, you often go crypto → stablecoin → exchange → bank account. Read our cashing out guide.
The Risks
Stablecoins are more stable than Bitcoin, but they're not risk-free:
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De-pegging risk. Even fiat-backed stablecoins can briefly lose their peg. USDC de-pegged to $0.87 during the SVB collapse before recovering. If you needed to cash out during the de-peg, you'd have taken a loss.
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Reserve risk. If the issuer's reserves aren't what they claim, the stablecoin could collapse. This is why transparency matters — USDC's monthly attestations are more reassuring than USDT's limited reporting.
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Smart contract risk. For crypto-backed stablecoins like DAI, the smart contracts holding the collateral could be exploited. Audit history and time-tested code reduce this risk but don't eliminate it.
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Regulatory risk. Governments are still figuring out how to regulate stablecoins. New rules could restrict usage, require additional KYC, or force changes to how reserves are held.
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Exchange risk. If you're holding stablecoins on an exchange rather than in your own wallet, you have the same counterparty risk as holding any crypto on an exchange. A hardware wallet like Tangem lets you self-custody your stablecoins with the same tap-to-sign simplicity as any other token.
For a full deep dive on stablecoin types, use cases, and security, our Stablecoins Explained guide covers the mechanics in detail.
Frequently Asked Questions
Can a stablecoin go to zero? A fiat-backed stablecoin like USDC would only go to zero if the issuer's reserves were entirely lost or fraudulent and there was no recovery. An algorithmic stablecoin can and has gone to near-zero (TerraUSD). Crypto-backed stablecoins like DAI are very unlikely to go to zero because they're overcollateralized, but they can de-peg temporarily.
Are stablecoins a good investment? Stablecoins are not investments — they're tools for stability and utility. They don't appreciate in value. If you hold $1,000 in USDC for a year, you'll still have $1,000 (minus any fees). Their value is in what they enable: fast transfers, yield earning, and volatility protection.
Which stablecoin should I use? For US users: USDC (most transparent, regulated). For international transfers: USDT on Tron (lowest fees, widest adoption). For DeFi purists: DAI (decentralized, no company behind it). Don't put all your stablecoin holdings in one type — diversification reduces risk.
How do stablecoins earn yield in DeFi? When you deposit stablecoins into a lending protocol like Aave, borrowers pay interest to borrow them. The protocol takes a small cut and passes the rest to lenders. Rates fluctuate based on demand for borrowing. This is not a bank account — it's a smart contract with code risk.
Are stablecoin transactions taxable? In the US, buying a stablecoin with USD is not a taxable event. But swapping one crypto for a stablecoin IS a taxable event (you're disposing of property). Using stablecoins to buy goods or services may also be taxable. Keep records. See our cashing out and record-keeping guide.
CGH Take: Stablecoins are one of the most useful innovations in crypto — they give you the speed and borderless nature of crypto without the volatility. But "stable" doesn't mean "risk-free." Understand what backs your stablecoin, don't keep large amounts on exchanges, and diversify across types if you're holding significant value.