What is a stablecoin? Definition, types, and how they work

A stablecoin is a digital token designed to hold a constant value, almost always one US dollar. Unlike Bitcoin or Ether, whose prices float freely, a stablecoin is built to be boring: a dollar today, a dollar tomorrow, a dollar next year.

That stability is what makes stablecoins useful for payments. Circulating stablecoin supply has grown past 200 billion dollars, according to public trackers such as DefiLlama, and stablecoins now settle trillions of dollars in transfer volume per year. Most of that activity is not speculation. It is money movement: businesses paying suppliers, workers receiving salaries, and companies holding digital dollars in markets where local currency loses value.

How does a stablecoin keep its value?

The dominant model is simple: for every token in circulation, the issuer holds one dollar of reserves, typically cash and short-term US Treasuries. When a customer deposits dollars, the issuer mints new tokens. When a customer redeems tokens, the issuer burns them and returns dollars. As long as reserves match supply and redemption works, arbitrage keeps the market price pinned to one dollar.

Trust depends on proof. Serious issuers publish regular reserve reports. Circle, the issuer of USDC, publishes monthly attestations from an independent accounting firm. Tether, the issuer of USDT, publishes quarterly attestations. Regulation increasingly turns this from good practice into law: reserve, redemption, and disclosure requirements are now written into frameworks like the EU's MiCA and the US GENIUS Act, which we cover in our stablecoin regulation tracker.

What types of stablecoins exist?

Three structures cover almost everything in circulation:

• Fiat-backed stablecoins. Reserves are held in cash and cash equivalents at banks and custodians. USDC and USDT both work this way, and together they account for the large majority of stablecoin supply. This is the model regulators have chosen to formalize, and the only model widely used for business payments.
• Crypto-collateralized stablecoins. The token is backed by other crypto assets locked in smart contracts, with more collateral than issued value to absorb price swings. DAI is the best-known example. These are transparent by design but more complex, and their supply is small compared to fiat-backed coins.
• Algorithmic stablecoins. These tried to hold a peg through supply algorithms rather than full reserves. The model failed badly: TerraUSD collapsed in May 2022 and erased tens of billions of dollars of value. Modern regulation, including MiCA, effectively excludes unbacked algorithmic designs from operating as payment stablecoins.

There is also a growing category of yield-bearing dollar tokens that pass reserve interest to holders. Regulators generally treat these differently from payment stablecoins, and most payment flows avoid them.

Which stablecoins matter for payments?

Two tokens dominate: USDT (Tether) is the largest by circulation and dominates trading volume, especially outside the US. USDC (Circle) is generally preferred by US businesses for its reserve transparency and regulatory posture. The practical differences, chain support, liquidity, and compliance considerations are covered in our comparison of USDC vs USDT for payments.

Both run on multiple blockchains, including Ethereum, Base, Polygon, Arbitrum, Solana, and Tron. The network affects transfer cost and speed, but a properly backed dollar token is worth one dollar on any of them.

One common confusion is worth clearing up: not every large crypto asset is a stablecoin. XRP, for example, is a floating asset, not a pegged one. We explain the distinction in Is XRP a stablecoin?

How did stablecoins get here?

A short timeline explains why the category looks the way it does:

• 2014. Tether launches the first widely used dollar token, initially on a Bitcoin sidechain, to give crypto traders a stable unit between trades.
• 2018. Circle and Coinbase launch USDC with a compliance-first posture: US licensing, monthly attestations, and reserves in cash and Treasuries.
• 2020 to 2021. Supply grows tenfold as stablecoins become the settlement layer of crypto markets, and the first serious payment use cases appear in emerging markets.
• May 2022. TerraUSD, an algorithmic stablecoin with no full reserves, collapses from 18 billion dollars to nearly zero in a week. The failure reshapes both the market and the coming regulation: full reserves or nothing.
• 2023 to 2025. Regulation arrives. The EU adopts MiCA, the US passes the GENIUS Act, and Brazil, Japan, Singapore, and the UAE build licensing regimes. Stablecoins become a regulated payments product rather than a crypto curiosity.
• 2026. Supply exceeds 200 billion dollars, banks pilot their own tokens, and businesses adopt stablecoin rails through APIs rather than exchanges.

The pattern across the timeline: every crisis removed a weak design, and every regulation locked in the strong one. What survived is the fully reserved, redeemable, attested dollar token.

How is a stablecoin different from bank money and CBDCs?

A dollar in a bank account is a claim on that bank, moved through systems like ACH that run on banking hours. A stablecoin is a claim on the issuer's reserves, moved on public blockchains that run continuously. In practice the differences that matter are hours (24/7 vs banking days), speed (minutes vs days for cross-border), programmability (API-native vs portal-native), and counterparty (issuer reserves vs bank balance sheet).

A central bank digital currency (CBDC) would be a direct claim on the central bank. Despite years of pilots, no major economy has launched a retail CBDC at scale, and the US has moved in the opposite direction, formalizing private stablecoin issuance through the GENIUS Act instead. For the foreseeable future, regulated private stablecoins are the digital dollar that actually ships.

What are stablecoins used for?

• Cross-border payments. A stablecoin transfer settles in seconds to minutes, at any hour, on any day, without correspondent banks. A payment that takes 3 to 5 business days by international wire can arrive the same day when it moves as a stablecoin and pays out over a fast local rail like Pix in Brazil. This is the core of stablecoin payments as a business practice.
• Dollar access and savings. People and companies in high-inflation economies hold digital dollars without a US bank account. This is one of the largest real-world uses in Latin America, Africa, and parts of Asia.
• Market settlement. Stablecoins are the cash leg of most crypto trading, which is where their liquidity depth comes from.
• Programmable treasury. Because stablecoins are software objects, payouts, conversions, and sweeps can be automated through an API rather than a banking portal.

How do businesses use stablecoins without holding crypto?

Most businesses that benefit from stablecoins never touch a token directly. They use infrastructure providers that handle the crypto leg in the middle:

1. Money enters as regular fiat, for example a Pix transfer in Brazil or an ACH transfer in the US, and is converted to stablecoins.
2. The stablecoins move across a blockchain in minutes.
3. On the other side, the stablecoins convert to local currency and pay out over the local rail.

The sender sees a normal bank payment out. The receiver sees a normal bank payment in. The stablecoin leg supplies the speed and reach. Providers expose this as a stablecoin API, and products like virtual accounts let a business receive US bank transfers that settle directly as USDC.

What does it cost to move money with stablecoins?

Three costs stack in a stablecoin payment, and all three are usually smaller than their traditional equivalents:

• Network fees. The blockchain transfer itself: fractions of a cent on networks like Tron, Base, or Solana, a few cents to a few dollars on Ethereum depending on congestion. Fixed per transfer regardless of amount, which makes large transfers extremely cheap to move.
• Conversion. The FX rate and fee when stablecoins become local currency or the reverse. This is the meaningful cost in a cross-border flow, and it is where providers differ most: an opaque rate can hide more margin than any stated fee. Always compare the total amount received.
• Provider fees. Flat or percentage fees per payout or collection, published upfront by transparent providers.

Compare that stack to an international wire: 25 to 50 dollars in bank fees, correspondent deductions along the way, an FX margin frequently above 2 percent, and days of waiting. The stablecoin route compresses all of it into one quoted conversion and a settlement measured in minutes.

What are the risks of stablecoins?

An honest list, because the risks are real and manageable:

• Issuer risk. The token is only as good as the reserves behind it. Prefer issuers with frequent independent attestations and clear redemption rights.
• Depeg events. Even well-run stablecoins can trade briefly below one dollar during stress. USDC dipped in March 2023 when a reserve bank failed, then recovered fully within days. Structure matters more than headlines: the reserves were there.
• Regulatory change. Rules are tightening in most major markets. That is mostly good for payment users, since it standardizes reserves and redemption, but it means issuer and provider choices should track the rules. Our regulation tracker follows the main regimes.
• Operational risk. Sending tokens on the wrong network or to a wrong address can lose funds. Using a provider with compliance checks and managed wallets removes most of this class of error.

How are stablecoins regulated?

The short version: payment stablecoins are becoming a licensed, reserve-regulated product category worldwide. The EU's MiCA regime requires authorization, full reserves, and redemption at par, explained in our MiCA guide. The US GENIUS Act establishes federal requirements for payment stablecoin issuers. Brazil regulates stablecoin service providers through its central bank framework for virtual asset service providers. Japan limits issuance to licensed entities such as banks and trust companies.

For a business, the practical consequence is that compliance lives at the provider layer: the provider that converts and moves your funds should run KYC, sanctions screening, and travel rule compliance on every transfer.

How does BlindPay fit in?

BlindPay is a stablecoin API for global payments. Businesses use it to convert USDC and USDT to local fiat and pay out over local rails like Pix, SPEI, ACH, and wire in 100+ countries, with KYC and compliance built into every flow, plus virtual US accounts that turn incoming bank transfers into stablecoins automatically. Live conversion rates are public, for example USDC to BRL, and pricing is flat and published. The point of the product is the theme of this article: your customers and counterparties see normal bank money, and the stablecoin layer does the work invisibly.

This article is for general information only and is not legal, tax, or financial advice.