Stablecoin

Quick Definition

A stablecoin is a cryptocurrency designed to maintain a stable value by pegging its price to a reference asset, typically the US dollar, at a 1:1 ratio. Stablecoins combine the programmability, speed, and accessibility of crypto with the price stability needed for everyday financial use. As of 2026, the total stablecoin market exceeds $278 billion in supply, and the US government has enacted the GENIUS Act to regulate stablecoin issuers.

What It Means

Volatility is crypto's biggest barrier to practical financial use. Bitcoin's 80%+ drawdowns and day-to-day price swings make it impractical as a unit of account or medium of exchange. If you price a product in Bitcoin today, it might be worth 20% more or less tomorrow.

Stablecoins solve this. A dollar-pegged stablecoin like USDC is always worth approximately $1.00. It can be sent anywhere in the world in seconds for pennies in transaction fees, used in DeFi protocols, accepted by any crypto-native merchant, while carrying none of Bitcoin's price risk. This is why stablecoins have grown to over $278 billion in total supply and process more transaction volume than most national currencies.

The GENIUS Act (Guiding and Establishing National Innovation for U.S. Stablecoins Act), signed into law on July 18, 2025, established the first comprehensive federal framework for stablecoin regulation in the United States. The law requires all "payment stablecoins" to be backed 1:1 by cash or short-term US Treasury bills, subject to monthly attestations and Bank Secrecy Act compliance. This regulatory clarity triggered a surge in stablecoin supply, with the market growing by approximately $18 billion in the first month after enactment alone.

Types of Stablecoins

1. Fiat-Collateralized (Centralized)

Backed 1:1 by real dollars and equivalent assets held in bank accounts or short-term Treasuries. Each token represents a claim on real-world reserves held by a centralized issuer.

How it works: User sends $1,000 USD to Circle, Circle mints 1,000 USDC, user can use USDC anywhere. To redeem, user sends 1,000 USDC to Circle, Circle burns the tokens and wires $1,000 back.

Risk: Centralization. The issuer can freeze addresses, be regulated into insolvency, or face bank runs if reserves are questioned. In 2023, USDC briefly de-pegged to $0.87 when Circle disclosed it held $3.3B in reserves at Silicon Valley Bank during the SVB collapse. Under the GENIUS Act, issuers with over $10 billion in market cap must obtain a federal charter or face a temporary halt in new coin issuance.

2. Crypto-Collateralized (Decentralized)

Backed by cryptocurrency held in a smart contract as collateral, typically overcollateralized to absorb crypto price volatility.

How DAI works: User deposits $150 in ETH, MakerDAO smart contract mints $100 in DAI. User has $100 DAI plus $50 equity in their position. If ETH price drops to where collateral falls below 150%, automated liquidation occurs.

Risk: If collateral crypto crashes faster than the liquidation mechanism can act, the system becomes undercollateralized. Crypto market crashes create cascading liquidations that stress these systems.

3. Algorithmic (No Direct Collateral)

Attempts to maintain the peg through algorithmic supply adjustments, expanding supply when price exceeds $1, contracting when price falls below $1. No real-world or crypto collateral backs the peg.

The Terra/LUNA catastrophe: TerraUSD was an algorithmic stablecoin relying on a mint/burn mechanism with LUNA tokens. When confidence broke and UST began de-pegging, users rushed to exit. Massive LUNA minting to absorb UST sales caused LUNA to hyperinflate. Confidence collapsed entirely, and $40 billion in market cap was destroyed in 72 hours. The event wiped out the savings of millions of retail investors globally. The GENIUS Act's reserve requirements are a direct regulatory response to this failure.

The GENIUS Act: US Stablecoin Regulation (2025-2026)

The GENIUS Act, enacted as Public Law 119-27 on July 18, 2025, established the first comprehensive federal framework for payment stablecoins in the United States:

In March 2026, the Office of the Comptroller of the Currency (OCC) issued a notice of proposed rulemaking to implement the GENIUS Act. The proposal adopts a bank-like model with requirements for licensing, capital, reserves, custody, and risk management. Nonbank issuers would need to operate within a substantially bank-like regulatory framework, materially increasing the cost and complexity of entry.

The GENIUS Act explicitly prohibits payment of interest or yield to stablecoin holders, applying regardless of form (cash, tokens, or other consideration). This means US-regulated payment stablecoins cannot directly compete with high-yield savings accounts on interest, though they can still be used in DeFi protocols to earn yield indirectly.

Global Stablecoin Regulation

Stablecoin Yields in DeFi

Stablecoins held in DeFi protocols earn interest from lending demand:

The stablecoin yield vs. HYSA comparison matters for risk-adjusted decision-making. A high-yield savings account offers FDIC insurance and virtually no risk. DeFi yields on stablecoins carry smart contract risk, protocol risk, and peg risk. For emergency funds, FDIC-insured savings remains the safer choice. For funds you can afford to risk, DeFi yields on stablecoins can be attractive.

Common Mistakes to Avoid

• Assuming all stablecoins are equally safe: USDC and USDT are backed by reserves and now regulated under the GENIUS Act. Algorithmic stablecoins like TerraUSD had no real backing and collapsed entirely. Always verify what backs the stablecoin you are using.
• Confusing a stablecoin with a bank deposit: USDC is a token redeemable for $1 from Circle, backed by dollar-equivalent reserves. It is not a dollar itself. It is a private claim on a dollar. This creates counterparty risk that a true bank deposit with FDIC insurance does not. Read our guide on high-yield savings accounts for the comparison.
• Ignoring the GENIUS Act yield prohibition: US-regulated payment stablecoins cannot pay interest directly to holders. If you are earning yield on stablecoins, you are doing so through a DeFi protocol or exchange, which adds additional risk layers beyond the stablecoin itself.
• Forgetting that pegs can break: Even well-backed stablecoins have de-pegged temporarily. USDC dropped to $0.87 during the SVB crisis in 2023. If you need to liquidate during a de-peg event, you may receive less than $1 per token.

Key Points to Remember

• Stablecoins maintain a $1 peg using reserves (fiat-backed), overcollateralized crypto, or algorithms
• USDT ($167B) and USDC ($67B) are the two dominant stablecoins, with combined market cap exceeding $230B
• The GENIUS Act (July 2025) established the first US federal stablecoin framework, requiring 1:1 reserve backing and tiered oversight
• Algorithmic stablecoins have repeatedly failed catastrophically. The Terra/LUNA collapse destroyed $40B+
• Stablecoins are the currency layer of DeFi. All lending, trading, and yield protocols use them
• Even "safe" stablecoins carry reserve risk (USDC/SVB) and smart contract risk (DAI)
• The GENIUS Act prohibits payment of yield to stablecoin holders, separating the payment function from investment

Related Concepts

• Cryptocurrency: The broader digital asset category that stablecoins belong to
• Blockchain: The underlying technology that enables stablecoin issuance and transfer
• DeFi (Decentralized Finance): Protocols that use stablecoins as their primary currency
• Ethereum: The leading smart contract platform where most stablecoins operate
• Bitcoin: The largest cryptocurrency, whose volatility stablecoins are designed to avoid
• Smart Contract: The self-executing code that powers decentralized stablecoins like DAI

Frequently Asked Questions

Q: Is USDC the same as a dollar? A: USDC is a token redeemable for $1 from Circle, backed by dollar-equivalent reserves held in short-term Treasuries and cash. It is not a dollar itself. It is a private claim on a dollar. This creates counterparty risk that a true bank deposit (with FDIC insurance) does not. Under the GENIUS Act, Circle's reserves must be held in cash or short-term US Treasury bills and subject to monthly attestations.

Q: What caused TerraUSD to collapse? A: TerraUSD maintained its peg algorithmically through a mint/burn relationship with LUNA. When large holders began selling UST, the peg broke. The mechanism required minting more LUNA to absorb the UST being sold, which hyperinflated LUNA. As LUNA's value collapsed, confidence in the entire system evaporated in a bank-run dynamic that the algorithm could not stop. $40 billion was destroyed in 72 hours.

Q: Are stablecoins safe for earning yield? A: They are lower-risk than volatile crypto but higher-risk than FDIC-insured savings. Risks include smart contract exploits (protocol hack drains funds), issuer failure (centralized stablecoin reserves questioned), and peg failure (especially for algorithmic types). For meaningful emergency funds, FDIC-insured HYSA is safer. Stablecoin DeFi yields are appropriate for funds you can afford to risk. Read our research on crypto as an investment for more context.

Q: What does the GENIUS Act mean for stablecoin users? A: The GENIUS Act primarily regulates issuers, not users. For users, it means that US-regulated stablecoins must be fully backed by cash or Treasuries, subject to monthly attestations and audited financials for large issuers. It also means that US-regulated payment stablecoins cannot pay yield directly to holders. The Act becomes fully effective by January 2027 (or 120 days after final regulations are issued). Foreign stablecoins must meet equivalent standards to be offered in the US.