- A stablecoin is a cryptocurrency designed to track the price of another asset — almost always the US dollar.
- The three biggest are USDC (Circle), USDT (Tether), and DAI (MakerDAO/Sky). Combined, they handle hundreds of billions in monthly volume.
- USDC is the most regulated and audited. USDT has the most liquidity globally. DAI is the most decentralized.
- For most users, USDC is the default. The others are situational tools.
- Educational only. Stablecoins have real risks: peg failures, regulatory changes, and counterparty risk on the issuers.
What is a stablecoin?
A stablecoin is a cryptocurrency engineered to maintain a stable price — typically pegged 1:1 to the US dollar. One USDC equals one dollar. One USDT equals one dollar. Most of the time, anyway.
The point of stablecoins isn’t to make money on price. It’s to capture all the benefits of crypto rails (instant global transfer, 24/7 settlement, programmability, no banking middlemen) while pricing in something stable enough to use as money.
Without stablecoins, you can’t price a $50,000 invoice in a volatile asset like ETH that might be worth $48,000 by the time it arrives. With stablecoins, the global economy gets a programmable dollar.
How do stablecoins actually work?
1. Fiat-backed (USDC, USDT)
The issuer holds real US dollars (and short-term Treasury bills) in a bank account. For every dollar held, they mint one stablecoin. When you redeem, they burn the stablecoin and wire you a real dollar.
This is the simplest model. The trade-off: you’re trusting the issuer. If Circle (USDC) or Tether (USDT) ever has reserve problems, the peg can break.
2. Crypto-collateralized (DAI)
Instead of dollars in a bank, DAI is backed by crypto (mostly ETH and USDC) locked in smart contracts. To mint $100 of DAI, you typically need to lock $150+ of crypto as collateral. The over-collateralization absorbs price volatility.
This is more decentralized — there’s no Circle or Tether as a single point of failure. The trade-off: it’s mechanically more complex and depends on the underlying collateral staying valuable.
3. Algorithmic (mostly avoid)
Maintains the peg through algorithmic supply adjustments instead of collateral. Terra/UST was the most famous one. It collapsed in May 2022, wiping out ~$60B. Most pure algorithmic stablecoins have failed for the same structural reasons. Skip these.
The three you need to know
USDC (USD Coin)
Issued by Circle. Most regulated, most audited, transparent monthly reserve attestations. Used as the default on-chain dollar by most US-based DeFi protocols and institutional users. Best choice for most operators.
USDT (Tether)
Issued by Tether. Largest supply by volume. Most liquidity globally, especially in Asia and Latin America. Less transparent reserves historically, though improving. Best for global liquidity, especially non-US settings.
DAI (MakerDAO / Sky)
Issued by a decentralized protocol. Backed by crypto + USDC. No central issuer to subpoena or shut down. Best for decentralization-maximalists or for situations where you want to avoid US regulator-controllable stablecoins.
Other names you’ll see
PYUSD (PayPal’s stablecoin, growing), FDUSD (First Digital, Asia), USDS (newer Sky-issued sibling of DAI). Generally niche or newer. The big three above cover ~95% of real-world stablecoin use.
What can you do with stablecoins?
- Hold dollars without a US bank account. Especially valuable for expats, digital nomads, and anyone in a country with capital controls.
- Send money internationally in seconds for cents. $50K wire would cost $30 and take 3 days. The same in stablecoin: ~$1 and 30 seconds.
- Earn yield on dollar-equivalents. Lending markets (Aave, Morpho, Compound) typically pay 4-8% APY on stablecoin deposits.
- Receive payments without merchant accounts. Especially for cross-border B2B and digital goods.
- Buy crypto without going through fiat each time. Trade between crypto pairs without bank wires.
What are the risks?
Peg failure
The stablecoin loses its 1:1 peg. USDC briefly traded as low as $0.87 during the SVB banking crisis in March 2023 before recovering. Plan for it. Don’t hold 100% of your dollar exposure in one stablecoin.
Issuer risk (USDC, USDT)
If Circle or Tether had a reserve problem, the stablecoin could lose its peg. Mitigation: spread across multiple stablecoins.
Regulatory risk
Stablecoin regulation is evolving in the US, EU, and elsewhere. Specific rules can change quickly.
Smart-contract risk (DAI)
DAI relies on smart contracts that could theoretically have bugs. Mitigated by extensive auditing but never eliminated.
Top courses for understanding stablecoins properly
- ARCrypto Online Course — covers stablecoin selection, payment routing, and lending strategies for HNW principals and expats
- Tether and Circle public reserve reports — read directly to understand backing
- Bankless deep-dives on stablecoins — free, current
Ready to use stablecoins strategically?
The ARCrypto online course covers stablecoin payment routing across jurisdictions, lending markets for yield, and the operational stack for expats and digital nomads using stablecoins as their primary cash. Online curriculum + live mastermind + private community. By application only.
Frequently asked questions
Are stablecoins really stable?
Are stablecoins safer than holding dollars in a bank?
Can I lose money on stablecoins?
Do I pay taxes on stablecoins?
Which stablecoin should I use?
Educational content only. Not investment, tax, or legal advice. ARC Educational LLC is not a broker, dealer, exchange, custodian, or investment adviser. Always work with qualified, licensed professionals. See our disclaimers.