How Crypto Works. Stablecoins

Stablecoins have become the backbone of the cryptocurrency economy. They power decentralized finance (DeFi), enable cross-border payments and serve as the primary on-ramp for millions of users entering the digital asset space. In 2026, the total stablecoin market capitalization exceeds $150 billion, and daily transaction volumes regularly surpass those of major payment networks. But how do these tokens actually maintain their dollar peg? What separates a reliable stablecoin from one that collapses overnight? This guide covers the mechanics, types, risks and real-world applications of stablecoins – everything a developer, founder or investor needs to understand the infrastructure behind stable digital money.

What are stablecoins?

Stablecoins are cryptocurrencies designed to maintain a stable value by pegging their price to a reference asset – most commonly the US dollar, though some are pegged to the euro, gold or other commodities. Unlike Bitcoin or Ethereum, whose prices can swing 10-20% in a single day, stablecoins aim to stay at exactly $1.00 (or the equivalent value of their reference asset) at all times.

The question that immediately arises is: why create a new digital token worth $1 when the dollar itself already exists? The answer lies in compatibility. Traditional dollars cannot interact with blockchain networks and smart contracts. A bank transfer cannot be recorded inside a blockchain transaction because the dollar does not exist natively within that system. Smart contracts – self-executing programs on the blockchain – cannot formulate obligations, escrow arrangements or automated payments in fiat currency. Stablecoins solve this by creating a blockchain-native representation of dollar value that smart contracts can read, hold and transfer programmatically.

Beyond technical compatibility, stablecoins offer several practical advantages over traditional dollars. Transactions settle in minutes rather than days. They operate 24/7, unlike banking systems that close on weekends and holidays. Cross-border transfers cost cents instead of the $25-50 wire fees charged by banks. And in many jurisdictions, cryptocurrency transactions face fewer regulatory restrictions than fiat transfers – making stablecoins a practical payment rail in regions with limited banking infrastructure.

Stablecoins also serve as a safe harbor within crypto markets. When a trader expects a price decline, they can quickly convert volatile assets into USDT or USDC without the delays and fees of converting back to fiat currency. This function alone accounts for a massive portion of stablecoin usage – exchanges worldwide use stablecoins as their primary trading pair denomination.

How stablecoins maintain their peg

The central challenge of any stablecoin is maintaining its peg – keeping the market price at exactly $1.00. To understand how this works, consider an analogy from traditional monetary policy.

Imagine a country decides to issue a national currency – call it the Mongolian tugrik – with an exchange rate permanently fixed at one US dollar. For people to trust that one tugrik equals one dollar, they must know that at any time, they can walk into an exchange office and swap tugriks for dollars at a 1:1 rate without bureaucratic delays. The country must therefore hold dollar reserves equal to (or very close to) the total number of tugriks in circulation.

Now here is where it gets interesting. If the tugrik’s market price dips to $0.99, arbitrage traders immediately buy the discounted tugrik on the open market and redeem it from the government for a full dollar – pocketing a 1% profit on every unit. Since automated trading software executes this operation in milliseconds, the excess supply of cheap tugriks is absorbed almost instantly, and the price snaps back to $1.00. Conversely, if the tugrik rises to $1.01, the government (or authorized market makers) sell tugriks from their reserves, increasing supply and pushing the price back down.

This arbitrage loop is the fundamental mechanism that keeps stablecoins pegged. For fiat-backed stablecoins like USDT and USDC, the “government” in this analogy is the issuing company (Tether or Circle). For crypto-collateralized stablecoins like DAI, the mechanism is built into smart contracts that automatically adjust supply through overcollateralization and liquidation. For algorithmic stablecoins, the arbitrage loop is implemented entirely through mint-and-burn token mechanics – with varying degrees of success.

Regardless of the specific design, every stablecoin relies on this core principle: someone, somewhere, must be willing to exchange the stablecoin for exactly $1.00 worth of value. When that willingness disappears – because reserves are insufficient, smart contracts are exploited or market confidence evaporates – the peg breaks. The severity of a de-peg event depends entirely on how quickly the arbitrage mechanism can restore equilibrium.

Types of stablecoins

Not all stablecoins are created equal. The mechanism used to maintain the peg determines the stablecoin’s risk profile, decentralization level and regulatory treatment. There are four major categories, each with distinct trade-offs.

Fiat-collateralized stablecoins

Fiat-collateralized stablecoins are the simplest and most widely used type. An issuing company holds reserves of real-world assets – cash, US Treasury bills, commercial paper, money market funds – and mints tokens on a 1:1 basis against those reserves. When a user deposits $1,000 into the issuer’s bank account, the issuer creates 1,000 tokens on the blockchain. When the user wants to redeem, they return the tokens (which are burned) and receive $1,000 back.

USDT (Tether) is the largest stablecoin by market capitalization, with over $80 billion in circulation. It operates on multiple blockchains including Ethereum, Tron, Solana, Avalanche and Polygon. Tether’s reserves reportedly consist of US Treasury bills, overnight repurchase agreements, cash equivalents and a smaller allocation to corporate bonds and secured loans. The company publishes quarterly attestation reports, though it has never undergone a full independent audit – a fact that has drawn persistent criticism from regulators and industry observers.

USDC (Circle) is the second-largest fiat stablecoin, with approximately $30 billion in circulation. Circle takes a more transparent approach: USDC reserves are held in segregated accounts at regulated US financial institutions and invested exclusively in short-term US Treasuries and cash. Monthly attestation reports are published by Deloitte, and Circle actively pursues regulatory compliance across multiple jurisdictions. USDC is widely regarded as the more trustworthy option for institutional users, though its smaller market cap means slightly less liquidity on some trading pairs.

The redemption process differs between issuers. Tether requires a minimum redemption of $100,000, effectively limiting direct redemption to institutional players. Circle allows redemption starting at $100 through its Circle Account platform. For most retail users, the practical way to convert stablecoins to dollars is through cryptocurrency exchanges rather than direct redemption with the issuer.

Crypto-collateralized stablecoins

Crypto-collateralized stablecoins replace the centralized issuer with smart contracts that hold cryptocurrency as collateral. The most prominent example is DAI, issued by the MakerDAO protocol (now rebranded to Sky) on Ethereum.

The key challenge with crypto collateral is volatility. If you back a $1 stablecoin with $1 worth of ETH, a 20% price drop would leave the stablecoin undercollateralized and vulnerable to a bank run. MakerDAO solves this through overcollateralization: to mint 100 DAI (worth $100), a user must lock up at least $150 worth of ETH or other approved collateral in a smart contract vault (formerly called a Collateralized Debt Position or CDP).

This vault system works as follows. A user deposits ETH into a MakerDAO vault smart contract and specifies how much DAI they want to borrow against it. The protocol enforces a minimum collateralization ratio – typically 150% for ETH, meaning $150 of ETH collateral for every $100 of DAI minted. The user receives freshly minted DAI and can use it freely in DeFi protocols, trading or payments.

If the value of the locked collateral drops and the collateralization ratio falls below the minimum threshold, the vault is flagged for liquidation. Automated liquidation bots (called Keepers) then purchase the collateral at a discount, repay the DAI debt and return any remaining collateral to the vault owner. This liquidation mechanism ensures that DAI remains backed by sufficient collateral even during severe market downturns.

The protocol relies on oracle systems to determine current market prices for collateral assets. These oracles are specialized smart contracts where trusted data providers (called oracle feeds) publish off-chain price data onto the blockchain. To prevent manipulation, the system uses median filtering – taking the middle value from multiple oracle feeds – and a one-hour delay module that gives governance time to react to potentially corrupted price data.

DAI’s decentralized design means there is no single company that can freeze user funds or censor transactions. However, it is worth noting that a significant portion of DAI’s collateral now consists of USDC and other centralized assets – introducing indirect centralization risk. MakerDAO’s governance community has debated this trade-off extensively, with some arguing that real-world asset collateral improves stability while others view it as a compromise of the protocol’s decentralization principles.

Algorithmic stablecoins

Algorithmic stablecoins attempt to maintain their peg without any collateral – or with minimal collateral – using purely programmatic supply-and-demand mechanisms. The core idea is simple: when the token price rises above $1, the protocol mints new tokens to increase supply and push the price down. When the price falls below $1, the protocol burns tokens (or incentivizes users to burn them) to reduce supply and push the price up.

In practice, most algorithmic stablecoin designs rely on a dual-token model. One token is the stablecoin itself, and the other is a governance or “share” token that absorbs volatility. When the stablecoin trades above $1, the protocol mints new stablecoins and distributes them to share-token holders, diluting the stablecoin supply. When the stablecoin trades below $1, users can burn stablecoins to receive share tokens at a discounted rate – reducing stablecoin supply and theoretically restoring the peg.

The most dramatic failure in stablecoin history was the collapse of TerraUSD (UST) and its companion token LUNA in May 2022. UST was an algorithmic stablecoin that maintained its peg through a mint-and-burn relationship with LUNA. When UST traded below $1, users could burn 1 UST to receive $1 worth of LUNA, creating an arbitrage incentive. But when a large sell-off triggered a de-peg, the mechanism entered a death spiral: as users rushed to burn UST for LUNA, the massive influx of newly minted LUNA crashed its price, which further undermined confidence in UST, which triggered more burning, which minted more LUNA. In the span of a week, UST dropped from $1 to near zero, LUNA’s price fell from $80 to fractions of a cent and approximately $40 billion in market value was wiped out.

The UST collapse was a watershed moment for the industry. It demonstrated that algorithmic pegs are inherently fragile – they work during normal conditions but can unravel catastrophically during a crisis when the arbitrage incentive is overwhelmed by panic selling.

Despite this history, algorithmic designs continue to evolve. Ethena’s USDe, launched in 2024 and growing significantly through 2025-2026, represents a new approach. Rather than relying on a companion token, USDe maintains its peg through delta-neutral hedging: the protocol holds crypto collateral (primarily staked ETH) and opens equivalent short perpetual futures positions, creating a position that is market-neutral regardless of ETH price movements. The yield generated from staking rewards and futures funding rates is distributed to USDe stakers. While this approach has shown resilience, it introduces its own risks – notably counterparty risk with the exchanges where futures positions are held, and the possibility of prolonged negative funding rates that could drain the protocol’s reserves.

Commodity-backed stablecoins

Commodity-backed stablecoins extend the fiat-collateralized model by pegging to physical assets like gold, silver or oil. The most notable example is PAXG (Pax Gold), where each token represents one fine troy ounce of London Good Delivery gold held in Brink’s vaults. Tether Gold (XAUT) operates on a similar model.

These tokens appeal to investors who want exposure to commodity prices without the complexities of physical storage, insurance and transportation. They also enable fractional ownership – a user can buy $50 worth of gold-backed tokens without purchasing an entire gold bar.

The commodity-backed stablecoin category remains relatively niche compared to dollar-pegged stablecoins, but it represents an important bridge between blockchain technology and traditional asset classes. As the broader trend of real-world asset (RWA) tokenization accelerates, commodity-backed tokens are likely to expand beyond precious metals into agricultural commodities, carbon credits and other tangible assets.

USDT vs USDC vs DAI: a comparison

Choosing the right stablecoin depends on your priorities – whether you value liquidity, transparency, decentralization or regulatory compliance. Here is a side-by-side comparison of the three dominant stablecoins.

For DeFi developers, DAI offers the advantage of censorship resistance and composability with other decentralized protocols. For businesses processing payments, USDC’s regulatory clarity and lower redemption minimums make it the safer choice. For traders on centralized exchanges, USDT’s deep liquidity across virtually every trading pair makes it the default option despite transparency concerns.

Stablecoin regulation in 2026

The regulatory landscape for stablecoins has shifted dramatically since the UST collapse accelerated legislative urgency worldwide. In 2026, issuers face a patchwork of requirements that vary by jurisdiction but share common themes: reserve transparency, consumer protection and systemic risk mitigation.

The European Union led the charge with the Markets in Crypto-Assets Regulation (MiCA), which took effect for stablecoins in June 2024. Under MiCA, stablecoin issuers operating in the EU must obtain authorization as electronic money institutions, maintain reserves of at least 1:1 backing in liquid assets, publish regular reserve reports and restrict issuance of non-euro stablecoins to prevent them from undermining European monetary sovereignty. The regulation caps daily transaction volumes for non-euro stablecoins at 200 million euros – a provision that directly impacts USDT and USDC usage in European markets.

In the United States, stablecoin legislation has been the subject of intense debate. Multiple bills have been introduced in Congress, with the general direction pointing toward requiring stablecoin issuers to hold reserves in high-quality liquid assets (similar to bank reserve requirements), submit to regular audits by registered accounting firms and maintain redemption capabilities for all token holders. The question of whether stablecoins should be regulated as securities, commodities or a new asset class remains contested, with the SEC and CFTC continuing to assert overlapping jurisdictions.

For FinTech companies building payment infrastructure, these regulations create both challenges and opportunities. Compliance costs increase, but regulatory clarity also opens doors to institutional adoption. Banks and payment processors that previously avoided stablecoins due to legal uncertainty are now integrating them into their service offerings under the new frameworks.

The impact on issuers has been tangible. Circle has invested heavily in MiCA compliance, obtaining an Electronic Money Institution license in France. Tether, by contrast, has taken a more cautious approach to European regulation, and questions remain about USDT’s long-term availability in EU markets. For decentralized stablecoins like DAI, the regulatory picture is less clear – MiCA’s provisions were designed primarily for centralized issuers, and the application of these rules to decentralized protocols remains an open legal question.

Reserve requirements under the new regulations mandate that stablecoin issuers hold collateral in safe, liquid instruments – primarily government bonds and cash deposits at regulated banks. This means issuers can no longer rely on higher-risk assets like commercial paper or corporate bonds for the majority of their reserves. While this reduces potential returns for issuers, it significantly improves safety for users and reduces systemic risk across the broader financial system.

Stablecoins in DeFi

Decentralized finance would not exist in its current form without stablecoins. They serve as the foundational unit of account, medium of exchange and store of value across virtually every DeFi protocol. Understanding how stablecoins function within DeFi is essential for anyone building or using Web3 applications.

Lending and borrowing protocols. Platforms like Aave, Compound and Spark (formerly Maker’s lending arm) allow users to deposit stablecoins and earn interest from borrowers. A user might deposit 10,000 USDC into Aave’s lending pool and earn 3-8% annual yield, depending on market conditions. Borrowers pay this interest in exchange for access to capital without selling their crypto holdings – a mechanism known as collateralized borrowing. Stablecoins are by far the most borrowed asset class in DeFi because they provide predictable, dollar-denominated capital that borrowers can use for trading, business expenses or real-world payments.

Liquidity pools and automated market makers. Decentralized exchanges like Uniswap and Curve rely on liquidity pools – smart contracts where users deposit pairs of tokens to facilitate trading. Stablecoin liquidity pools (such as the USDC/USDT pool on Curve or the DAI/USDC pool on Uniswap) are among the deepest and most actively traded in DeFi. Liquidity providers earn a share of trading fees generated by the pool. Curve Finance, in particular, specializes in stablecoin-to-stablecoin swaps with minimal slippage, making it the protocol of choice for large stablecoin conversions.

Yield farming and liquidity mining. Many DeFi protocols incentivize stablecoin deposits by distributing governance tokens to liquidity providers. A user might deposit USDC into a lending protocol and receive both interest payments and a stream of the protocol’s native governance token. While yields have compressed significantly from the triple-digit APYs of DeFi’s early days, stablecoin yield farming remains one of the most accessible entry points for users seeking returns on their crypto holdings without exposure to price volatility.

Cross-border payments and remittances. Stablecoins are increasingly used for international money transfers, particularly in corridors where traditional banking infrastructure is slow, expensive or inaccessible. A worker in the United States can send USDC to family in the Philippines, where the recipient converts it to local currency through a local exchange or peer-to-peer platform. The entire process takes minutes and costs a fraction of what services like Western Union charge. Companies like Circle have built enterprise payment APIs specifically for this use case, and multiple FinTech startups are building stablecoin-powered remittance products.

Real-world asset integration. The convergence of stablecoins and real-world assets (RWAs) is one of the most significant DeFi trends of 2025-2026. Protocols now use stablecoins to facilitate the purchase and trading of tokenized Treasury bills, corporate bonds, real estate fractions and other traditional financial instruments on-chain. This trend blurs the line between DeFi and traditional finance, creating hybrid systems that combine the programmability of smart contracts with the stability and familiarity of conventional assets.

De-pegging events and risks

Stablecoins are designed to be boring – that is their purpose. But history has shown that even the most established stablecoins can experience dramatic de-peg events that ripple across the entire crypto ecosystem. Understanding these risks is critical for developers building applications that depend on stablecoin stability and for users holding significant stablecoin balances.

The UST collapse (May 2022). The most catastrophic de-peg event in crypto history began on May 7, 2022, when a series of large sells pushed TerraUSD (UST) below its $1 peg. The algorithmic mechanism that was supposed to restore the peg – burning UST to mint LUNA – instead created a death spiral. As LUNA’s price crashed under the weight of newly minted tokens, confidence in UST evaporated, triggering a bank run. Within five days, UST dropped from $1 to $0.10. LUNA fell from $80 to effectively zero. Approximately $40 billion in combined market value was destroyed. The contagion spread to lending platforms like Celsius and Voyager, which held significant UST positions, ultimately pushing both into bankruptcy. The UST collapse demonstrated that algorithmic stablecoins without sufficient collateral are inherently vulnerable to self-reinforcing panic.

The USDC Silicon Valley Bank scare (March 2023). On March 10, 2023, Silicon Valley Bank (SVB) failed – the second-largest bank failure in US history. Circle disclosed that approximately $3.3 billion of USDC’s reserves (about 8% of the total) were held at SVB. The news triggered immediate selling, and USDC dropped to $0.87 on some exchanges – a 13% de-peg for a token designed to always equal $1. Panic spread to DAI as well, since a significant portion of DAI’s collateral was held in USDC. Over the weekend, before the FDIC announced it would make all SVB depositors whole, billions of dollars in value hung in the balance. The peg was fully restored by March 13, but the event exposed a fundamental risk: even fully collateralized stablecoins are only as safe as the banks holding their reserves.

Tether’s ongoing controversies. USDT has faced persistent questions about reserve adequacy throughout its history. In 2021, Tether paid $41 million to settle charges by the US Commodity Futures Trading Commission, which found that USDT was not fully backed by fiat reserves “at all times” as the company had claimed. Tether’s reserves have at various points included commercial paper, secured loans and other assets whose liquidity and quality have been questioned. Despite these controversies, USDT has maintained its peg through multiple market crises – largely because Tether has consistently honored large-scale redemptions when tested. However, the lack of a comprehensive independent audit means that the full picture of Tether’s risk exposure remains uncertain.

Systemic risks. The interconnected nature of DeFi means that a stablecoin failure can cascade across protocols. Smart contracts that hold billions in stablecoin liquidity do not distinguish between a “healthy” USDC at $1.00 and a “de-pegged” USDC at $0.87 – they treat the token at face value until oracle price feeds update. This delay can create opportunities for exploitation and can amplify losses during crisis events. For developers building on stablecoins, implementing circuit breakers, price deviation checks and multi-stablecoin strategies is essential risk management. Security audits and gas optimization should specifically evaluate how a protocol handles stablecoin de-peg scenarios.

Beyond individual events, there are structural risks inherent to the stablecoin ecosystem. Concentration risk arises from the dominance of USDT and USDC – if either experienced a catastrophic failure, the impact on crypto markets would be severe. Regulatory risk means that a sudden change in government policy could freeze stablecoin operations in major markets. And smart contract risk – the possibility of bugs or exploits in the contracts that govern stablecoin issuance and redemption – is an ever-present concern, particularly for decentralized application developers who integrate stablecoins into their protocols.

How Pharos Production builds stablecoin infrastructure

At Pharos Production, we work with FinTech companies and blockchain projects building the next generation of stablecoin-related infrastructure. Our team has hands-on experience across the full spectrum of stablecoin development – from smart contract architecture for token systems to DeFi protocol integration and security auditing.

Token system development. We design and implement ERC-20 token contracts with the features that stablecoin-adjacent projects require: role-based access control, pausability, blacklist functionality, upgrade proxies and integration with oracle systems. Our Solidity development practice follows rigorous testing and audit standards to ensure that token contracts behave correctly under all conditions – including edge cases that only emerge under extreme market stress.

DeFi protocol integration. For projects that need to interact with stablecoin liquidity – whether building a lending protocol, a payment gateway or a yield aggregator – we handle the integration with existing DeFi infrastructure. This includes interfacing with Aave, Compound, Curve, Uniswap and other major protocols, as well as implementing custom liquidity management strategies tailored to the project’s specific requirements.

Security audits. Stablecoin-related smart contracts are high-value targets for attackers. A single vulnerability in a contract managing millions in stablecoin liquidity can result in total loss of funds. Our audit process examines not just code correctness but also economic attack vectors, oracle manipulation risks, governance exploitation scenarios and de-peg handling logic. We have worked with projects like Kimlic to secure blockchain identity and verification systems that interface with token infrastructure.

Blockchain consulting and architecture. For teams in the early stages of building stablecoin-related products, we provide blockchain development consulting to help select the right chain, design the token economics and plan the technical architecture. Whether you are building a payment system that settles in stablecoins, a decentralized application that integrates stablecoin liquidity pools or a compliance layer for regulated stablecoin issuance, our team can help you move from concept to production-ready code.

The stablecoin ecosystem is evolving rapidly, and the projects being built today will define the financial infrastructure of the next decade. If you are working on stablecoin-related technology – whether it involves token design, DeFi integration, cross-border payments or regulatory compliance – reach out to our team to discuss how we can help you build secure, scalable and reliable infrastructure.