The Four Types of Stablecoins: A Complete Classification Guide

Introduction

Stablecoins have become the bridge between traditional finance and crypto — the roughly $310 billion market reached that size precisely because users needed a way to hold value without the volatility that defines bitcoin or ethereum. But most beginners treat all stablecoins as interchangeable "digital dollars," not realizing that the four types of stablecoins are structurally different instruments with different failure modes, different controllers, and different risk profiles. Understanding the type you hold is the first — and most important — step to evaluating any stablecoin safely. This guide walks through all four types, explains the mechanics of each peg, maps trade-offs between capital efficiency and decentralization, and gives you a practical framework to evaluate any stablecoin before using it.

What Is a Stablecoin and Why Does the Type of Stablecoin Matter?

The stablecoin market stood at roughly $310 billion by August 2026 — up about 14% year over year (DefiLlama, 2026). Most beginners treat all stablecoins as interchangeable "digital dollars," but the four types of stablecoins are structurally different instruments with different failure modes, different controllers, and different risk profiles. Knowing the type is the first — and most important — step to evaluating any stablecoin safely.

What Is a Stablecoin and Why Does the Type Matter

A stablecoin is a crypto token engineered to hold a fixed value ↗ — usually $1. The engineering differs entirely by type. Think of four different ways to keep a bucket of water from tipping: weigh it down with ballast (fiat reserves), brace it with more water (crypto collateral), balance it algorithmically (code-driven supply), or anchor it to something physical (a gold bar). Each method works under different conditions and fails under different pressures. Stablecoins maintain their pegs the same way: fiat-backed models hold bank deposits or Treasury bills, crypto-collateralized stablecoins lock excess crypto in smart contracts, algorithmic stablecoins use supply expansion and contraction, and commodity-backed stablecoins hold physical assets in vaults. The mechanism determines who controls the peg, who can break it, and whether a user's funds are safe when markets stress.

The Four Core Categories at a Glance

The four stablecoin types are: fiat-backed, crypto-collateralized, algorithmic, and commodity-backed. Fiat-backed stablecoins — led by Tether (USDT) at ~$183 billion ↗ and USD Coin (USDC) at ~$73.6 billion ↗, with newer regulated entrants such as PayPal's PYUSD and Ripple's RLUSD — dominate the market (CoinPaprika; DefiLlama, 2026). Crypto-collateralized stablecoins such as DAI and Sky Dollar (USDS) hold ~$12 billion. Algorithmic and synthetic models account for ~$8 billion, led by synthetic dollars such as Ethena's USDe. Commodity-backed tokens, led by tokenized gold, hold a smaller but growing share. Each type makes a specific trade-off between capital efficiency, decentralization, and stability. T1 below maps all four at a glance, and each section that follows goes deep on one type.

Data current as of September 2026.

Understanding these distinctions lays the foundation for every comparison, risk assessment, and regulatory analysis that follows.

How Do Fiat-Backed Stablecoins Work and What Are Their Risks?

Fiat-backed stablecoins account for roughly $284 billion of the ~$310 billion total stablecoin market — about 91% of all supply (DefiLlama, 2026). USDT and USDC sit in this category. The fiat-backed model is the simplest of all stablecoin types to understand, and its dominance reflects that simplicity — but its stability is entirely dependent on a centralized issuer's honesty about what it holds in reserve.

How Fiat-Backed Stablecoins Maintain the Dollar Peg

For every fiat-backed stablecoin minted, the issuer holds $1 worth of reserves — cash, Treasury bills, or money market instruments — in a bank account. The mint-and-redeem cycle: a user deposits $1,000 USD → issuer mints 1,000 USDC → user transfers tokens on-chain → on redemption, the issuer burns the tokens and returns $1,000. If USDC trades at $0.99 on a secondary market, arbitrageurs buy cheap and redeem at $1.00 directly with the issuer — that spread restores the peg. Reserve composition matters: Circle holds primarily short-term US Treasuries and cash equivalents. USDC crossed $50 trillion in cumulative on-chain transfer volume in December 2025 (CoinDesk, Dec 2025). PYUSD (PayPal), FDUSD (First Digital), and the newer, regulation-first RLUSD (Ripple, launched 2025) ↗ follow the same model — as does USDT (Tether), the market's largest stablecoin.

What Are the Real Risks of Fiat-Backed Models

Three structural risks accompany the fiat-backed design. First, counterparty risk: when Silicon Valley Bank failed in March 2023, $3.3 billion of USDC's reserves were trapped there — USDC briefly traded at $0.87 before the FDIC backstopped deposits and the peg recovered within days. Second, reserve quality risk: Tether's earlier disclosures included commercial paper and secured loans alongside cash — assets that liquidate more slowly under stress. Third, censorship risk: fiat-backed issuers hold on-chain freeze and blacklist capabilities — both Circle and Tether have exercised these at law enforcement request. These risks are traditional finance risks wrapped inside a crypto token, not blockchain-native risks. The GENIUS Act (July 2025) requires 1:1 reserve backing, mandatory licensing, and independent audits for US-regulated payment stablecoins — but the underlying centralization does not disappear.

The photo below (P1) illustrates the fiat-backed model's core premise: real-world money sitting in reserve, accessible through a digital interface.

How Do Crypto-Collateralized Stablecoins Stay Stable Without a Central Issuer?

Crypto-collateralized stablecoins replace the bank account with a smart contract. No CEO, no custodian, no single point of control — code alone enforces collateral rules on a public blockchain. DAI, now transitioning to USDS under Sky Protocol (formerly MakerDAO) ↗, pioneered this design. The entire crypto-collateralized stablecoin category holds roughly $12 billion in supply (DefiLlama, 2026), a fraction of the fiat-backed market but a meaningful pool for decentralized finance (DeFi).

How Over-Collateralization Keeps Crypto-Backed Stablecoins Stable

The core mechanic is over-collateralization: to mint $100 of DAI, a user locks $150 or more of ETH into a smart contract vault. The extra $50 is a buffer — if ETH falls 20%, the collateral is still worth $120, comfortably above the $100 debt. Lifecycle: lock ETH → vault opens → DAI minted at 150% collateral-to-debt ratio → user spends DAI anywhere on-chain → to recover ETH, user repays DAI plus a stability fee → vault closes. Sky Protocol (formerly MakerDAO) sets a minimum 150% collateralization ratio for ETH vaults; average practice runs ~155% (CoinLaw, 2026). Conservative vault owners target 170–200% to leave extra buffer. Stablecoin collateral in smart contracts is fully on-chain — anyone can audit vault balances in real time on Ethereum. Other designs include LUSD (Liquity, 110% minimum, ETH-only collateral) and GHO (Aave, multi-asset pools).

What Happens When Collateral Value Drops Below the Threshold

When a vault's collateral ratio falls below the minimum, the smart contract triggers liquidation. The collateral gets auctioned to repay the stablecoin debt; the vault owner loses collateral plus a liquidation penalty (typically 13% on Sky Protocol). The danger is liquidation cascades: when ETH drops sharply, many vaults hit limits simultaneously. Auctions sell large ETH quantities into an already-falling market — the added selling pressure pushes prices lower and triggers further liquidations. Black Thursday in March 2020 exposed this: ETH dropped ~50% in hours, network congestion broke the auction system, and MakerDAO absorbed ~$4 million in bad debt — cleared via a governance-authorized MKR auction. The decentralization advantage (on-chain collateral, no CEO, censorship resistance) carries this trade-off: code can react to a market panic but cannot stop one.

How Do Algorithmic Stablecoins Work and Why Have They Failed?

The appeal of algorithmic stablecoins ↗ is real: a stablecoin with no reserve, no collateral, no custody — code alone managing supply. That model sounds like peak capital efficiency. For a period in 2020–2022, markets believed it worked. Then the TerraUST collapse in May 2022 erased approximately $40 billion in value and reset the entire category (Wharton Stablecoin Toolkit, 2026).

How the Mint-and-Burn Mechanism Works Without Reserves

Algorithmic stablecoins monitor market price and adjust supply in response. Above $1: the protocol mints more tokens — supply expands until price falls. Below $1: it burns tokens or issues "bonds" to reduce supply. The Terra/UST dual-token mechanic let users always swap $1 of LUNA for 1 UST and vice versa — that arbitrage was supposed to hold the peg. Rebase models (Ampleforth/AMPL) adjust every wallet's balance proportionally each epoch. The debt-based seignorage model issues internal bonds redeemable for tokens when supply later expands. T2 below compares these three sub-models.

Data current as of September 2026.

Why Algorithmic Stablecoins Failed at Scale

The confidence problem defines every algorithmic stablecoin failure: these systems work only while participants believe they will keep working. When that belief fractures, the peg mechanism becomes an accelerant ↗. The Terra/UST death spiral ↗ ran in six steps: (1) a large UST sell-off begins; (2) price drops below $1; (3) users burn UST for LUNA at the implied $1 rate; (4) LUNA supply explodes as the protocol mints to absorb every redemption; (5) LUNA price crashes under the new supply; (6) each LUNA buys less UST value — the arbitrage that was supposed to restore the peg instead accelerated collapse. The loop ran to near-zero in days. Total losses reached approximately $40 billion in May 2022 (Wharton Stablecoin Toolkit, 2026). The GENIUS Act (July 2025) bans unbacked algorithmic payment stablecoins in the US. EU Markets in Crypto-Assets Regulation (MiCA) requires full reserve backing for stablecoins above minimum thresholds — pure algorithmic models cannot comply. Hybrid designs that layer supply-management logic on top of real collateral remain viable (see Section 11), but pure algorithmic stablecoins as a standalone category are finished.

What Are Commodity-Backed Stablecoins and When Do They Make Sense?

Commodity-backed stablecoins are the most tangible of the four types: each token represents a physical object in a vault. The tokenized gold market stood at roughly $3.2 billion as of August 2026, led by PAXG (~$2.0B) and XAUT (~$1.1B) at roughly 85% of category share (CoinPaprika; DefiLlama, 2026). It is the smallest stablecoin type by market cap, but it serves a use case the others cannot.

How Commodity-Backed Tokens Digitize Physical Assets

The model mirrors fiat-backed stablecoins but substitutes gold for dollars. An issuer — Paxos for PAXG, Tether for XAUT — purchases London Good Delivery gold bars, stores them in audited vaults (PAXG uses Brink's vaults in London), and mints one ERC-20 token per fine troy ounce held. The token trades at the gold spot price, not at $1. Lifecycle: buy PAXG on an exchange → issuer holds the physical gold → PAXG tracks gold's price on secondary markets → a holder with sufficient minimum quantity can request physical redemption. The critical distinction: one PAXG is worth one troy ounce of gold, not one dollar. Stablecoin collateral here is metal in a vault, subject to periodic third-party audits — not a bank account or smart contract.

Who Should Use Commodity-Backed Stablecoins

Three audiences benefit from commodity-backed stablecoins. Inflation hedgers gain on-chain gold exposure without the logistics of storing physical metal. Portfolio diversifiers add a non-correlated store of value without leaving the blockchain. Traders in markets where dollar-denominated stablecoins face regulatory barriers can use gold-backed tokens for settlement. These tokens are not suitable for everyday payments — their value fluctuates with the gold price, not the dollar. Liquidity is also far lower than USDT or USDC; the entire tokenized gold market at ~$3.2 billion is smaller than USDC's single-day settlement volume on active trading days. The right framing: commodity-backed stablecoins solve the problem of on-chain access to physical-asset exposure. They do not solve the problem of dollar-denominated price stability.

How Do the Four Stablecoin Types Compare on Risk, Decentralization, and Capital Efficiency?

No single stablecoin type dominates every dimension. Fiat-backed stablecoins lead on simplicity and liquidity; crypto-collateralized stablecoins lead on decentralization; commodity-backed tokens offer inflation resistance; algorithmic models pursued capital efficiency and found structural failure. T3 below maps all four types across the dimensions that matter most for a practical decision.

How Do the Four Types Compare on Risk, Decentralization, and Capital Efficiency

Three dimensions determine which stablecoin type fits a given context:

Three dimensions separate the stablecoin types:

Collateral requirement: Fiat-backed stablecoins are the most capital-efficient — $1 in reserve per $1 issued. Crypto-collateralized stablecoins require at least $1.50 per $1 issued, the least efficient of live designs. Algorithmic models aimed for zero collateral — theoretically hyper-efficient, practically impossible to sustain. Commodity-backed tokens match the commodity price 1:1 — similar efficiency to fiat-backed, but the peg target is gold's price, not the dollar.

Decentralization: Fiat-backed stablecoins are fully centralized — issuers control reserves and can freeze individual addresses. Crypto-collateralized stablecoins operate through smart contracts with no centralized override; Sky Protocol's governance is entirely on-chain. Algorithmic designs were decentralized by architecture but fragile in confidence dynamics. Commodity-backed tokens are centralized through the vault custodian.

Transparency: Crypto-backed models publish collateral on-chain in real time — the highest transparency of any type. Fiat-backed transparency depends on how frequently the issuer publishes third-party attestations and the auditor's rigor. Commodity-backed models require periodic vault audits, which vary in schedule. Algorithmic models' mechanics were on-chain, but their systemic confidence risk remained invisible until collapse.

Scalability: Fiat-backed stablecoins scale directly with reserve capital — supply grows whenever the issuer raises demand. Crypto-backed supply is constrained by how much collateral users are willing to lock. Algorithmic models theoretically scaled without limit; in practice they scaled toward collapse.

Data current as of September 2026.

Which Stablecoin Type Is Right for Your Use Case

The "safest" stablecoin depends on what risk a holder is protecting against.

Payments and trading: Fiat-backed stablecoins (USDT, USDC) offer the widest exchange acceptance, the deepest liquidity, and the clearest regulatory standing under the GENIUS Act. The trade-off is centralized issuer control.

DeFi and censorship resistance: Crypto-collateralized stablecoins (DAI/USDS, LUSD) serve users who need a stablecoin no centralized party can freeze. The trade-off is capital inefficiency — over-collateralization costs more than a 1:1 reserve model.

Inflation hedge and gold exposure: Commodity-backed stablecoins (PAXG, XAUT) provide gold-price exposure without physical storage. The peg is to gold, not the dollar — the token moves with commodity markets.

Algorithmic and hybrid: Pure algorithmic stablecoins have no viable use case after 2022 and 2025's regulatory restrictions. Hybrid designs with meaningful collateral backing (see Section 11) can be assessed on collateral quality.

How Are Regulators Treating the Four Types of Stablecoins Differently?

2025 marked the first year that stablecoin law became enforceable reality in two of the world's largest markets. The GENIUS Act became US law in July 2025. MiCA (Markets in Crypto-Assets regulation) came into full effect across the European Union. Both frameworks treat the four stablecoin types differently — and the divergence shapes which models will dominate in regulated markets going forward.

How Regulators Around the World Are Treating Each Stablecoin Type

Fiat-backed stablecoins received the clearest treatment. Under the GENIUS Act, they must maintain 1:1 reserves in liquid assets, obtain federal or state licenses, and submit to independent audits (Plasma, 2025). The EU classifies them as E-Money Tokens (EMTs) under MiCA — the highest-clarity category.

Crypto-collateralized stablecoins occupy more ambiguous ground. The EU classifies them as Asset-Referenced Tokens (ARTs) under MiCA, with reserve disclosure and redemption-right requirements. In the US, DAI-type stablecoins may fall under securities or commodity frameworks — no definitive classification existed as of mid-2025.

Algorithmic (unbacked) stablecoins face the most hostile environment. The GENIUS Act effectively prohibits unbacked algorithmic payment stablecoins. MiCA's full-backing requirement bars pure algorithmic models above minimum thresholds.

Commodity-backed stablecoins fall under CFTC oversight in the US (as commodity-backed instruments) and ART classification under MiCA in the EU, with mandatory commodity reserve disclosure.

Data current as of September 2026.

What the GENIUS Act and MiCA Mean for Stablecoin Users

Under the GENIUS Act, users of a licensed fiat-backed stablecoin gain legal redemption rights — an issuer cannot refuse to return $1 per token — and audits create transparency where reserve quality was previously opaque. MiCA creates equivalent protections in the EU: licensed issuers must hold full reserves, disclose their composition, and honor redemption requests.

The most consequential restriction: the GENIUS Act bans yield-paying stablecoins from payment use. Products like sUSDS (Sky Protocol) and USDY (Ondo) that pass reserve earnings to holders remain legal as investment instruments, but cannot be marketed as payment stablecoins.

The practical result: regulatory pressure consolidates supply into licensed, fiat-backed models. Users who choose crypto-collateralized or commodity-backed stablecoins accept reduced regulatory protection in exchange for different risk and decentralization properties.

What Are Hybrid and Yield-Bearing Stablecoins?

Terms like "hybrid stablecoin," "fractional-algorithmic," and "yield-bearing" appear in DeFi discussions and often cause confusion about whether a fifth or sixth stablecoin type exists. These are not separate categories — they are extensions within or between the four established types. Each reflects the industry's attempt to improve on an established design's weaknesses.

What Hybrid and Yield-Bearing Stablecoins Add to the Picture

A hybrid stablecoin combines partial collateral with algorithmic supply management. The goal: better capital efficiency than pure over-collateralization without the reserve-free fragility of pure algorithmic designs. FRAX launched in 2021 at approximately 85% collateral backing with 15% algorithmic management via its FXS governance token — aiming to issue more stablecoins per dollar of collateral than DAI could. Yield-bearing stablecoins take a different approach ↗: they sit on top of fiat or crypto collateral and pass reserve income to holders. sUSDS (Sky Protocol's savings module), USDY (Ondo Finance), and USDL (Mountain Protocol) each hold Treasury bills or money market instruments and distribute the earned yield. These products grew rapidly through 2025 and 2026 as institutions sought digital cash with a built-in return — Ethena's USDe, a synthetic dollar that holds delta-neutral collateral and passes on funding yield, grew to roughly $4 billion on this demand, and the ~$3.2 billion tokenized gold market reflects the same appetite for yield plus collateral. Both categories extend the four core types, not replace them.

How FRAX Evolved From Algorithmic to Collateral-Heavy

FRAX's trajectory after May 2022 shows how the market corrects algorithmic overreach. When TerraUST collapsed, FRAX faced immediate credibility questions — if 15% algorithmic management could amplify a death spiral, why trust any partial algorithmic backing? Frax Finance gradually pushed the collateral ratio toward 100% — the algorithmic component was effectively dismantled. By 2024–2025, FRAX operated as a near-fully-collateralized model. Sky Protocol's DAI-to-USDS migration followed the same direction: it added real-world asset (RWA) backing — US Treasuries and traditional finance instruments — to diversify beyond pure crypto collateral. Both projects converged toward collateral depth after 2022. Hybrid and yield-bearing stablecoins are refinements of the four core types; the four-type classification framework remains the most useful starting point for any stablecoin analysis.

What Did Real-World Crises Reveal About Stablecoin Design?

Theory is best understood through failure. Each stablecoin type has faced at least one major stress event that exposed its core structural vulnerability — not as anomalies, but as the predicted failure modes of each design.

What Real-World Events Revealed About Each Stablecoin Design

Fiat-backed — USDC SVB depeg (March 2023): Circle held $3.3 billion of USDC reserves at Silicon Valley Bank ↗ when it failed. USDC fell to ~$0.87 before the FDIC backstopped deposits and the peg recovered. Lesson: a fiat-backed stablecoin is only as stable as its custodian bank.

Crypto-collateralized — DAI Black Thursday (March 2020): ETH dropped ~50% in hours. MakerDAO's liquidation auctions congested — some cleared at zero-DAI bids — liquidators received ETH for free. The protocol absorbed ~$4 million in bad debt, replenished via MKR auction. Lesson: liquidation cascades and network congestion can break even well-designed smart contracts.

Algorithmic — TerraUST collapse (May 2022): The ~$40 billion erasure (Wharton Stablecoin Toolkit, 2026) proved that confidence-dependent systems fail catastrophically once confidence breaks.

Commodity-backed: No major collapse has occurred in tokenized gold. The primary unresolved risk is vault audit fraud. It has not materialized at scale as of mid-2026.

Lessons From TerraUST That Still Apply in 2025

Three lessons from the TerraUST collapse apply to any stablecoin evaluation today. First, algorithmic stability built solely on market incentives is not stable — it is a coordination game that ends when participants stop coordinating. Second, high yield signals structural fragility: Anchor Protocol's ~20% APY on UST was subsidized, not earned, and the capital it attracted made the eventual collapse larger. Third, contagion travels fast — the UST death spiral triggered LUNA hyperinflation, contributed to Three Arrows Capital's insolvency, and deepened the 2022 bear market across crypto. The diagnostic question for any stablecoin: what happens if confidence drops? If the entire system unwinds, that is a structural red flag regardless of the label.

How Should a Beginner Evaluate Any Stablecoin Before Using It?

Armed with an understanding of all four stablecoin types, the same four questions apply to any stablecoin encountered. The framework converts marketing claims into verifiable facts.

How to Evaluate Any Stablecoin Before Using It

1. What backs it — specifically? "Backed by reserves" is not enough. Identify the exact reserve type: cash, Treasury bills, commercial paper, crypto in a smart contract, or physical gold in a vault. Each answer implies a different risk profile under stress.

2. How transparent is the backing? Crypto-collateralized stablecoins publish collateral on-chain in real time — the most transparent design. Fiat-backed stablecoins should provide monthly third-party attestations by a named firm. Commodity-backed tokens require periodic vault audits. Self-reported figures without independent verification warrant extra scrutiny.

3. Who controls the peg, and can they freeze funds? Fiat-backed issuers hold on-chain freeze capabilities — Circle and Tether have both used them. Crypto-collateralized smart contracts cannot target individual wallets. The distinction matters during a regulatory enforcement action.

4. Is it regulated, and what does that provide? A GENIUS Act–licensed stablecoin carries legal redemption rights and audit obligations. An unregulated stablecoin offers no enforceable consumer protections.

Which Questions Should You Ask About Reserves and Transparency

Four due-diligence checks before holding any stablecoin: (a) When was the last third-party attestation, and by whom? Gaps over 90 days signal reduced oversight. (b) What is the reserve composition — cash, T-bills, or other assets? Short-term Treasuries liquidate quickly; commercial paper and secured loans do not. (c) Is the issuer licensed under the GENIUS Act, MiCA, or an equivalent regime? Licensed issuers accept external accountability. (d) Has the stablecoin ever depegged, and did it recover? Brief depegs with fast recovery — like USDC post-SVB — reveal both a vulnerability and a working safety mechanism. A permanent depeg reveals a failed design. Proof-of-reserves systems (Chainlink PoR) extend real-time verification beyond on-chain collateral to fiat-backed models that implement them.

Why You Should Be Interested

• Investor: Choose stablecoin types matching your risk tolerance without picking fragile pegs.
• DeFi user: Lock collateral in decentralized stablecoins (DAI/USDS) without centralized issuer risk.
• Payments user: Understand why USDC and USDT dominate payments and what legal protections apply.
• Risk-conscious beginner: Evaluate any stablecoin using a four-question due-diligence framework.

FAQ

?What does "over-collateralized" mean in crypto-backed stablecoins?

Over-collateralization means you must lock more crypto than the stablecoin value you receive. To get $100 of DAI, you lock $150 of ethereum. The extra $50 is a safety buffer — if ETH drops 20%, your collateral is still worth $120, safely above your $100 debt. Without this buffer, a 10% ETH drop would instantly make your debt underwater, triggering immediate liquidation.

?Can a stablecoin depeg permanently?

Yes. TerraUST's May 2022 collapse went from $0.99 to near-zero in days and never recovered. When the peg mechanism breaks (the confidence-dependent system unwinds, or collateral evaporates), the token's value follows. Most brief depegs (USDC to $0.87 in March 2023) recover within hours or days once the underlying pressure eases; permanent depegs reveal a failed design.

?Why is transparency different for each stablecoin type?

Fiat-backed stablecoins depend on third-party audits because users cannot verify cash in a bank account on-chain. Crypto-collateralized stablecoins publish all collateral on-chain in real time — maximum transparency. Commodity-backed tokens require vault audits (checking that physical gold actually exists) on a periodic schedule. Algorithmic models' mechanics were on-chain, but the confidence dynamics that broke them remained invisible until collapse.

?What's the difference between a stablecoin and a CBDC?

Stablecoins are tokens issued by private companies (Circle, Tether, Sky Protocol) or governed by smart contracts. Central Bank Digital Currencies (CBDCs) are issued by government central banks and sit on central bank infrastructure. Stablecoins can be frozen or restricted by their issuers; a CBDC would be controlled entirely by the government. CBDCs are in early pilots; stablecoins are in production use at scale.

?Is Sky Protocol's USDS safer than DAI was?

USDS added real-world asset (RWA) backing — United States Treasury bonds and other traditional finance instruments — to diversify beyond pure ethereum collateral. This makes USDS less vulnerable to ethereum-specific crashes. Both USDS and DAI maintain the same 150% minimum collateralization ratio; the difference is collateral composition. More diverse collateral = lower collateral volatility = fewer liquidation cascades. The trade-off is centralization risk (Treasury bonds are custodied, not on-chain).

?What happens if I hold a stablecoin when it depegs?

You still hold the token, but it is no longer worth $1 — it is worth whatever the secondary market will pay for it. If you are holding USDC when it depegs to $0.85 and cannot redeem it directly with Circle, you are stuck selling at a loss on a secondary market. This is why fiat-backed stablecoins with redemption rights and reserve audits matter: redemption rights guarantee you can exit at $1 even if the secondary market has abandoned the token.

?Does the GENIUS Act apply everywhere?

No. The GENIUS Act is US federal law. It applies to stablecoin issuers offering payment stablecoins in the US. The EU has MiCA (Markets in Crypto-Assets Regulation), which differs in details but also imposes full-backing requirements. Offshore stablecoins (issued outside both jurisdictions) face weaker regulation but also cannot access bank infrastructure easily. Most major stablecoins (USDT, USDC, PYUSD) are choosing to comply with GENIUS Act and/or MiCA to maintain access to banking and liquidity.

?Why is liquidity so different between stablecoin types?

Fiat-backed stablecoins (USDT, USDC) have liquidity in the billions of dollars daily because payment users, traders, and exchanges all demand them. Crypto-collateralized stablecoins (DAI, USDS) have much smaller liquidity pools because DeFi users are their primary market. Commodity-backed stablecoins (PAXG, XAUT) have liquidity in the millions because users wanting gold exposure are a smaller segment. Liquidity follows market adoption; fiat-backed stablecoins are the on-ramps and off-ramps of crypto markets.

?Are algorithmic stablecoins completely dead?

Pure algorithmic stablecoins are effectively prohibited in the US (GENIUS Act) and EU (MiCA). However, hybrid designs that combine partial collateral with algorithmic supply management remain viable, though they have converged toward full or near-full collateralization as the market learned from TerraUST. FRAX, for example, moved from 85% collateralized in 2021 to near-100% by 2024–2025. The lesson: algorithmic elements are acceptable as refinements; algorithmic models as standalone category have no future.

?Can I arbitrage stablecoins that trade below $1?

Yes, if you have direct redemption rights with the issuer. If USDC trades at $0.99 and you can redeem directly with Circle at $1.00, the spread is risk-free profit — buy cheap, redeem at par, pocket the difference. This arbitrage is how the peg gets maintained. Most retail users cannot access direct redemption; large traders and market makers can, which is why depegs typically correct quickly unless the underlying issue (failed custodian, collapsed collateral) is structural.

References / Sources