Beginner Guide · Stablecoins
What Is a Stablecoin?
USDT, USDC, and DAI Explained
They look like dollars, act like dollars, and live on a blockchain. But they are not dollars — and the difference matters more than most people realise.
01 / The Problem
What Problem Do Stablecoins Solve?
To understand why stablecoins exist, you need to understand the friction they were built to remove.
Cryptocurrency is genuinely useful for many things: borderless transfers, censorship-resistant storage, access to DeFi protocols. But it has one property that makes it deeply impractical for everyday use — it is extraordinarily volatile. Bitcoin can lose 15% of its value in a day. Ethereum can lose 20%. You cannot pay rent, receive a salary, or price goods in an asset that swings that dramatically.
The traditional solution is to simply convert back to dollars when you need stability. But moving money from crypto back to fiat currency is slow, expensive, and restricted. Many exchanges take 2–5 days to process bank withdrawals. International transfers go through correspondent banks that charge significant fees. And in large parts of the world, a functioning local bank account is not available at all.
Stablecoins solve this by creating a cryptocurrency that is pegged to a stable reference asset — almost always the US dollar — so that 1 stablecoin is always worth approximately $1. They combine the programmability, speed, and borderless nature of cryptocurrency with the price stability of traditional currency.
A stablecoin is a cryptocurrency designed to maintain a stable value — typically $1 — by holding reserves, using collateral, or employing algorithmic mechanisms to manage its supply. It is the «calm» layer of the crypto ecosystem, sitting between volatile assets and traditional banking.
02 / The Categories
The Four Types of Stablecoin
Not all stablecoins maintain their peg the same way. The mechanism matters enormously — it determines how robust the peg is, what risks the holder faces, and what happens in a crisis. There are four main categories.
The category of stablecoin you hold determines your actual risk profile. A fiat-backed stablecoin is only as safe as the company holding the reserves. A crypto-backed stablecoin can be liquidated if collateral falls too far. An algorithmic stablecoin, as the world learned catastrophically in May 2022 with TerraUSD (UST), can collapse to zero in 72 hours.
The three stablecoins covered in depth in this guide — USDT, USDC, and DAI — represent the three most important types: centralized fiat-backed, regulated fiat-backed, and decentralized crypto-backed. Together they account for the overwhelming majority of stablecoin usage.
03 / Tether
USDT (Tether): The Largest and Most Controversial
Tether (USDT) is the world’s largest stablecoin and the third-largest cryptocurrency by market capitalization after Bitcoin and Ethereum. As of April 2026, its market cap exceeds $140 billion. It is also one of the most debated and scrutinized assets in the entire crypto ecosystem.
How Tether Works
Tether Limited, a company incorporated in the British Virgin Islands, issues USDT tokens. The premise is straightforward: for every 1 USDT in circulation, Tether holds $1 in reserves. You deposit dollars, receive USDT. You return USDT, receive dollars. The peg is maintained by the promise that redemption is always available at $1.
USDT runs on multiple blockchains simultaneously — Tron (where most volume occurs), Ethereum, Solana, and others — making it the most widely accessible stablecoin across different DeFi ecosystems.
For years, Tether claimed its reserves were entirely in cash dollars. Multiple legal investigations revealed this was not true. As of their most recent attestations (Q1 2026), Tether’s reserves include US Treasury bills, money market funds, secured loans, Bitcoin, and other assets — not purely cash. Tether has paid over $60 million in regulatory settlements regarding misrepresentations about its reserves. This history matters. It is not a reason to assume Tether will fail — it is a reason to understand what you’re actually holding.
Why USDT Is Still Dominant Despite the Controversy
The persistence of USDT’s dominance despite ongoing controversy reveals something important about how financial markets work: liquidity and network effects create enormous inertia. USDT is accepted on virtually every exchange, in virtually every DeFi protocol, in virtually every crypto transaction globally. For traders who need to move large amounts quickly, USDT’s liquidity depth is unmatched.
It is also particularly dominant in emerging markets — in countries with unstable local currencies, USDT has become a de facto savings vehicle and transaction medium. In Turkey, Nigeria, Argentina, and Vietnam, USDT usage by ordinary people seeking dollar exposure dwarfs its use by sophisticated traders. This real-world utility creates genuine demand that is independent of any trust in Tether Limited specifically.
| USDT at a Glance | |
|---|---|
| Issuer | Tether Limited (BVI) |
| Market cap (April 2026) | ~$140 billion |
| Primary chains | Tron, Ethereum, Solana, Polygon |
| Reserve composition | US Treasuries, money market funds, secured loans, some crypto |
| Audited? | Attestations only — not full independent audit |
| Regulatory history | $60M+ in settlements with NYAG and CFTC |
| Redemption | Available to verified entities ($100,000 minimum) |
| Main risk | Counterparty risk: Tether Limited’s solvency and reserve quality |
04 / USD Coin
USDC (USD Coin): The Regulated Alternative
USDC was launched in 2018 by Circle, a US-registered financial company, in partnership with Coinbase. It was explicitly designed as the compliant, transparent alternative to USDT — built from the outset to work with regulators rather than around them.
How USDC Works
Circle holds USDC reserves exclusively in cash deposited at US-regulated banks and short-duration US Treasury bills — held in segregated accounts, separate from Circle’s operating funds. Every month, independent accounting firm Grant Thornton publishes an attestation confirming the reserve balance matches the circulating supply.
This structure is intentionally bank-like. Circle operates under US money transmitter licenses and is regulated as a financial institution. USDC was designed to be the stablecoin that institutional investors, regulated businesses, and compliance-focused users could hold without legal uncertainty.
The March 2023 Incident — and What It Revealed
In March 2023, Silicon Valley Bank collapsed. Circle had approximately $3.3 billion of USDC reserves deposited at SVB. When this became known, USDC briefly depegged — falling as low as $0.87 — as holders rushed to sell. The peg was fully restored within days when the US government guaranteed SVB deposits, and Circle has since diversified its banking relationships.
The incident was instructive: even the «safer,» more transparent stablecoin carries real counterparty risk that manifests under stress. The risk was not the reserves themselves — those were real — but the concentration in a single bank and the uncertainty about whether those deposits were accessible.
USDC’s compliance-first design gives it clear advantages for institutional users and businesses: it is accepted on regulated platforms, can be used for compliant payments, and carries less regulatory uncertainty than USDT. But regulation also means USDC is subject to government orders to freeze or blacklist specific addresses — which has happened. Circle has complied with government requests to freeze USDC held at specific addresses multiple times. Whether this is a feature or a bug depends entirely on your perspective.
| USDC at a Glance | |
|---|---|
| Issuer | Circle Internet Financial (US-regulated) |
| Market cap (April 2026) | ~$55 billion |
| Primary chains | Ethereum, Solana, Polygon, Arbitrum, Base |
| Reserve composition | Cash at US regulated banks + short-term US Treasuries |
| Audited? | Monthly attestations by Grant Thornton |
| Regulatory status | US money transmitter licenses; EU MiCA compliant (2025) |
| Redemption | Available to verified Circle account holders, no minimum |
| Main risk | Banking counterparty risk; government freeze capability |
05 / DAI
DAI: The Decentralized Stablecoin
DAI is fundamentally different from USDT and USDC. There is no company called «DAI Inc.» that holds reserves. There is no CEO. No bank account. No single entity that can be regulated into existence or bankruptcy. DAI is a stablecoin created, managed, and maintained entirely by smart contracts on Ethereum — governed by holders of a token called MKR through a decentralized autonomous organization (DAO) called MakerDAO (now Sky Protocol).
How DAI Maintains Its Peg Without a Central Reserve
DAI uses a mechanism called over-collateralization. To create DAI, you don’t deposit dollars — you deposit cryptocurrency (ETH, wrapped Bitcoin, USDC, and others) worth more than the DAI you want to receive.
DAI works like a crypto-collateralized loan from a pawn shop
You bring in $150 worth of Ethereum to a pawn shop. They give you a $100 loan (in DAI). The $150 of collateral ensures you’re motivated to repay the loan — you get your ETH back when you do. If your ETH drops below a certain threshold, the smart contract automatically sells it to cover the DAI. This is over-collateralization: you always have more collateral locked in than DAI in circulation, which is what keeps DAI worth $1 even without any company holding reserves.
| DAI at a Glance | |
|---|---|
| Issuer | MakerDAO / Sky Protocol (DAO — no single company) |
| Market cap (April 2026) | ~$8 billion |
| Primary chain | Ethereum (multi-chain via bridges) |
| Backing | Over-collateralized crypto assets (ETH, wBTC, USDC, RWA) |
| Audited? | All collateral fully on-chain and verifiable in real time |
| Can be frozen by government? | Partially — collateral includes USDC which can be frozen |
| Main risk | Smart contract bugs; collateral crash faster than liquidation |
| Unique feature | DAI Savings Rate (DSR) — earn yield on DAI held in the protocol |
A significant portion of DAI’s backing is USDC — which means Circle can freeze those underlying assets, partially compromising DAI’s censorship resistance. MakerDAO has been gradually replacing USDC collateral with Real World Assets (US Treasuries held by regulated entities) and ETH, but as of April 2026, DAI retains meaningful centralized exposure in its collateral mix.
06 / The Peg Mechanism
How the Peg Actually Works — and When It Breaks
The $1 peg is the entire value proposition of a stablecoin. Understanding how it is maintained — and under what conditions it fails — is essential for anyone holding them.
How the Peg Is Maintained (Fiat-Backed)
For USDT and USDC, the peg relies on arbitrage. If USDT trades at $0.98 on an exchange, large players (arbitrageurs) will buy USDT cheaply on that exchange and redeem it with Tether for $1, pocketing the difference. This buying pressure pushes the price back to $1. If USDT trades at $1.02, arbitrageurs create new USDT by depositing dollars with Tether and sell it on the open market, pushing the price back down.
This mechanism works reliably under normal conditions. It can break down when:
Redemption Is Suspended
If the issuer temporarily halts redemptions — as happened with several stablecoins during the 2022 crypto crisis — the arbitrage mechanism breaks. If you can’t redeem USDT for $1, there’s no floor on the price. This is the single most important risk for fiat-backed stablecoins.
Reserve Quality Concern
If the market believes the issuer doesn’t actually have $1 for every token — perhaps because reserves are in risky assets that lost value — the peg can break on the downside even without a formal suspension. Fear, not fact, is sufficient to trigger a depeg if it generates enough selling pressure.
Algorithmic Collapse (UST Model)
The TerraUSD (UST) collapse in May 2022 erased $40 billion in market cap in 72 hours. The algorithmic mechanism that maintained UST’s peg relied on market confidence — when confidence broke, the mechanism accelerated the collapse rather than preventing it. This is the «death spiral» risk of unbacked algorithmic stablecoins.
The TerraUSD collapse was not an anomaly. It was a demonstration of what algorithmic stablecoins without real backing inevitably become: a confidence game that works until it doesn’t, and then unravels catastrophically. The $40 billion that disappeared wasn’t lost to hackers — it simply never existed as real value in the first place.
— The defining lesson of the 2022 stablecoin crisis
07 / The Real Risks
The Real Risks Every Stablecoin Holder Must Understand
Stablecoins are frequently presented as the «safe» part of a crypto portfolio — a place to park value without volatility. This framing is partially true and partially dangerous. Here are the real risks, stated plainly.
RISK ASSESSMENT — USDT · USDC · DAI (April 2026)
USDC: Low
DAI: Med
USDC: High
DAI: Med
USDT/C: Low
USDC: Low
DAI: Med
under normal conditions
Risk 1: The Issuer Risk (USDT and USDC)
When you hold USDT or USDC, you are trusting a private company to hold reserves on your behalf and honor redemptions on demand. This is structurally similar to trusting a bank — with the important difference that stablecoins are not covered by deposit insurance in most jurisdictions.
If Tether Limited or Circle became insolvent, were sanctioned by governments, or experienced a catastrophic banking failure, your USDT or USDC could be worth significantly less than $1. This scenario is considered low probability by most analysts — but «low probability» and «impossible» are not the same thing.
Risk 2: The Freeze Risk
Both Tether and Circle have the technical ability to freeze specific wallet addresses — to prevent the USDT or USDC held at those addresses from being transferred. They exercise this capability regularly, primarily in response to law enforcement requests or sanctions compliance.
As of April 2026, Tether has frozen over 1,200 addresses holding hundreds of millions in USDT. Circle has similarly frozen addresses under US government orders. For most users, this is never a concern. But it is a fundamental property of these assets that matters for anyone valuing financial privacy or censorship resistance.
Risk 3: The Regulatory Risk
Stablecoins are now under active regulatory attention in the US, EU, and UK. The EU’s MiCA framework (Markets in Crypto-Assets) — which took full effect in 2025 — requires stablecoin issuers to be licensed, hold fully segregated reserves, and comply with strict reserve and redemption requirements. USDC has obtained MiCA compliance. Tether’s MiCA status as of April 2026 remains unresolved.
A regulatory action that forced a major stablecoin offline — requiring all holders to redeem within a short timeframe — could cause significant disruption even for holders who did nothing wrong.
Risk 4: The «Not Your Keys» Problem
If you hold USDT or USDC on an exchange rather than in a self-custody wallet, you face the same custodial risk as holding any other crypto on an exchange. The collapse of FTX in 2022 resulted in billions in stablecoin losses for users — not because USDT or USDC failed, but because the exchange holding them failed. The stablecoin worked. The custodian didn’t.
- Never hold more stablecoins on an exchange than you need for active trading. Exchange failures have cost stablecoin holders billions. Self-custody eliminates exchange counterparty risk.
- Do not assume stablecoins are risk-free. They have lower volatility risk than Bitcoin or Ethereum, but they carry issuer risk, freeze risk, regulatory risk, and smart contract risk. These are different risks — not absent ones.
- Algorithmic stablecoins without substantial collateral backing are not equivalent to USDT, USDC, or DAI. The TerraUSD collapse showed that the word «stablecoin» guarantees nothing about stability without robust backing. Research before holding any new stablecoin.
- Hold stablecoins in a self-custody wallet (MetaMask, hardware wallet) for any amount you don’t need for immediate trading.
- Diversify across USDC and USDT if holding large amounts — concentration in a single issuer amplifies issuer-specific risk.
08 / Real-World Uses
What Stablecoins Are Actually Used For
The use cases for stablecoins go well beyond «avoiding crypto volatility.» Here is how stablecoins are actually deployed in practice — from individual users to institutional finance.
Trading Pairs and Liquidity
On crypto exchanges, USDT and USDC are the dominant quote currencies — most trading pairs are priced against a stablecoin. Moving in and out of stablecoins is how traders reduce exposure without leaving the crypto ecosystem or waiting for bank transfers.
DeFi Collateral and Lending
Stablecoins are the dominant collateral type in DeFi lending protocols. You can deposit USDC to earn interest, borrow against it, or provide liquidity in exchange for yield. Much of the $50B+ DeFi ecosystem runs on stablecoin liquidity.
Cross-Border Remittances
Sending $500 internationally via bank wire can cost $20–$50 and take 3–5 days. Sending $500 in USDC on Solana costs less than $0.01 and takes under 30 seconds. This is transforming remittances in countries like the Philippines, Mexico, and Nigeria.
Dollar Access in Inflation-Hit Countries
In Argentina, Turkey, Venezuela, and other countries with severe currency instability, USDT is used as a practical savings account — holding purchasing power in USD without requiring a US bank account or physical dollar bills.
Business Payments and Payroll
Remote-first companies increasingly pay international contractors in USDC, avoiding the cost and friction of international wire transfers. DAOs (decentralized organizations) often operate entirely in stablecoins for their treasury and contributor payments.
Yield Generation
Stablecoins deposited into DeFi protocols or exchanges can generate yield — typically 3–8% annually on platforms like Aave, Compound, or centralized offerings. This has made stablecoins a functional alternative to savings accounts for crypto-native users.
09 / What’s Coming
Regulation: The Coming Wave
Stablecoins have moved from a regulatory grey area to the centre of international financial policy debates. Here is where major jurisdictions stand as of April 2026.
| Jurisdiction | Status (April 2026) | Key Requirements |
|---|---|---|
| European Union | MiCA in full effect (2025) | Licensed issuers only; segregated reserves; redemption rights; €200M daily cap for non-EUR stablecoins |
| United States | Legislation pending (2026) | Stablecoin Act proposed; would require Federal Reserve oversight for issuers above $10B; reserve requirements; ban on algorithmic stablecoins |
| United Kingdom | FCA framework (partial, 2025) | FCA authorization required for UK-issued stablecoins; foreign issuers require recognition; USDC registered, USDT not yet |
| Singapore | MAS framework live (2024) | Single-currency stablecoins require MAS licence; reserve and redemption requirements; USDC and USDT both licensed |
The regulatory direction is clear: stablecoins are being treated as financial instruments requiring oversight, not as unregulated internet tokens. For holders, this creates both risk (potential compliance requirements, geographic restrictions) and protection (audited reserves, guaranteed redemption rights, deposit insurance discussions).
Regulated stablecoins like USDC under MiCA offer stronger redemption protections and reserve transparency than unregulated alternatives. But regulation also means stablecoins can be compelled to freeze addresses, restrict certain users, or comply with government orders — potentially affecting holders in unexpected ways. There is no risk-free stablecoin: the trade-off is between different types of risk, not the presence or absence of risk.
10 / The Bottom Line
Should You Use Stablecoins? The Honest Answer
Stablecoins serve a genuine and important function in the crypto ecosystem. For the right use cases, they are genuinely useful tools. For the wrong use cases — or when held without understanding their risks — they can cause real financial harm.
Use USDT when:
You need maximum liquidity and the widest exchange acceptance. You’re trading on platforms where USDC isn’t available. You’re in a country where Tether is the dominant stablecoin for practical dollar access. Understand its reserve history.
Use USDC when:
You prioritize regulatory compliance and reserve transparency. You’re using DeFi on Ethereum, Solana, or Layer 2s where USDC has deep liquidity. You need a stablecoin accepted by regulated businesses and payroll services.
Use DAI when:
You value decentralization over convenience. You want exposure to stablecoin yield through the DAI Savings Rate. You’re philosophically opposed to holding assets that a company can freeze — acknowledging DAI’s own partial centralization.
Think of stablecoins the way you think of cash in a wallet: fine for amounts you’re using actively, not appropriate for storing your life savings. The risks of stablecoins — issuer risk, regulatory risk, freeze risk — are low probability but real consequence events. The right response is not to avoid them, but to size your exposure appropriately: hold what you need for trading and DeFi activity, and don’t use stablecoins as a substitute for genuinely safe assets like government bonds or insured bank deposits for your core savings.
A stablecoin is not money. It is a claim on money — specifically, a claim on a private company or a set of smart contracts to honor a $1 redemption. Understanding that distinction is the beginning of understanding what you actually own when you hold one.
— The foundational distinction that most marketing materials omit