USDT vs USDC: Qual Stablecoin Você Deve Usar?
Both are pegged to $1, but they are built on different philosophies. Compare Tether and Circle on reserves, transparency, regulation and DeFi support, and find out which stablecoin fits your needs.
Visão geral do USDT vs USDC
USDT (Tether) and USDC (USD Coin) are by far the two largest stablecoins by circulating supply (DefiLlama, September 2026). Both are pegged 1:1 to the U.S. dollar: each token is designed to be worth $1. Behind that identical price target sit two very different companies, reserve strategies and philosophies.
USDT, emitido pela Tether Limited, pioneiro no conceito de stablecoin em 2014 e tornou-se o par de negociação dominante nas exchanges centralizadas em todo o mundo. USDC, lançado em 2018 pela Circle em parceria com a Coinbase, adotou uma abordagem diferente: total conformidade regulatória, atestações transparentes de reservas e foco na confiança institucional.
Choosing between them is not just a matter of preference. It affects your regulatory exposure, how well you can verify the reserves, which DeFi (decentralized finance) protocols you can use, and the risk to your capital. This guide breaks down every meaningful difference so you can decide with clear information.
Ambos com paridade de $1
USDT e USDC mantêm uma paridade de 1:1 com o dólar dos EUA por meio de reservas de dinheiro e equivalentes de caixa mantidas por seus emissores.
Emissores diferentes
A Tether Limited (BVI) emite USDT. A Circle Internet Financial (EUA) emite USDC. Jurisdições diferentes, padrões diferentes.
Filosofias diferentes
USDT prioriza liquidez e alcance global. USDC prioriza conformidade regulatória e transparência das reservas.
O que é USDT (Tether)?
USDT, comumente conhecido como Tether, é a primeira e maior stablecoin world's. Lançado em 2014 pela Tether Limited (uma empresa registrada nas Ilhas Virgens Britânicas e estreitamente afiliada à exchange Bitfinex), o USDT foi criado para fechar a lacuna entre a moeda fiduciária e o ecossistema cripto. Ele permite que os traders mantenham um ativo equivalente a dólares na cadeia sem precisar de uma conta bancária tradicional.
As of September 2026, USDT has a circulating supply of about $184 billion, per DefiLlama, which makes it the largest stablecoin by a wide margin. It is also the most traded stablecoin and the default quote currency on most exchanges. Market data moves daily: check the live figures on DefiLlama or CoinGecko.
USDT is deployed across more blockchains than any other stablecoin, including Ethereum (as an ERC-20 token), Tron (TRC-20, where the majority of USDT circulates), Solana, Avalanche, Polygon, Arbitrum, Optimism, BNB Chain, TON, and several others. This multi-chain presence makes USDT the default trading pair on most centralized exchanges globally.
Tether has, however, faced lasting scrutiny over its reserves. In October 2021, the CFTC ordered Tether to pay a $41 million penalty for misstating how its reserves were backed. Earlier that year, the New York Attorney General reached an $18.5 million settlement with Tether and Bitfinex over the same issues. Tether has since improved its disclosures. Its quarterly attestations now show most reserves held in U.S. Treasury bills and other cash equivalents; the current breakdown is on the Tether transparency page.
Pontos Fortes do USDT
- Maior capitalização de mercado e maior liquidez de qualquer stablecoin
- Par de negociação dominante em praticamente todas as exchanges centralizadas
- Available on many blockchains, including Tron, where transfer fees are very low
- Histórico mais longo: operando desde 2014
- Very high daily trading volume, which keeps spreads tight
Preocupações com o USDT
- Emissor baseado nas BVI; não sujeito às regulamentações bancárias dos EUA
- Multas regulatórias anteriores (CFTC, NYAG) por representação incorreta das reservas
- Quarterly attestations (not full audits) by BDO
- Relações estreitas com a Bitfinex levantam questões de governança
- Detalhes da reserva menos granulares que os relatórios mensais da USDC's
O que é USDC (Circle)?
USDC (USD Coin) is a fully reserved stablecoin issued by Circle Internet Group, a U.S. fintech company listed on the New York Stock Exchange since June 2025. USDC launched in September 2018 through the Centre Consortium, a joint venture between Circle and Coinbase. Since 2023, Circle alone has issued and managed USDC.
As of September 2026, USDC has a circulating supply of about $74 billion, per DefiLlama, making it the second-largest stablecoin. Its trading volume is well below USDT's. Still, USDC has become the preferred stablecoin for DeFi protocols, institutional investors and regulated financial applications.
What sets USDC apart is its focus on transparency and regulation. Circle publishes monthly reserve reports with an attestation by Deloitte, one of the Big Four accounting firms. These reports show USDC reserves held in cash at regulated banks (including BNY Mellon) and in short-term U.S. Treasury securities through the Circle Reserve Fund, managed by BlackRock. There is no commercial paper, no corporate bonds and no exotic assets.
USDC is available on Ethereum, Solana, Base, Arbitrum, Optimism, Polygon, Avalanche, Stellar and other chains. Circle also runs the Cross-Chain Transfer Protocol (CCTP), which burns USDC on one chain and mints it on another. This moves native USDC between supported chains without a third-party bridge.
Pontos fortes do USDC
- Atestações mensais de reservas pela Deloitte (auditor Big Four)
- Reserves held in cash and short-term U.S. Treasuries
- O emissor é uma empresa dos EUA regulada e de capital aberto
- Preferred stablecoin in DeFi (Aave, Compound, Morpho, Sky)
- Ponte nativa entre cadeias via CCTP (sem risco de terceiros)
- Issued under the EU MiCA framework for European markets
Preocupações com USDC
- Capitalização de mercado menor e volume de negociação mais baixo que o USDT
- March 2023 depeg to about $0.87 during the SVB failure (recovered in days)
- Menos dominante em exchanges centralizadas fora dos EUA
- Menos cadeias suportadas que o USDT (notavelmente ausente no Tron)
- A Circle pode congelar endereços (recurso de conformidade regulatória)
Principais diferenças entre USDT e USDC
Embora ambas as stablecoins acompanhem o dólar, suas diferenças se tornam significativas quando você analisa os detalhes. Aqui estão as cinco dimensões que mais importam.
Reservas & Transparência
This is the most important difference. Circle publishes monthly reserve reports for USDC, examined by Deloitte, that detail the composition of the reserves: cash at named banks and U.S. Treasuries managed by BlackRock. The reports are public on the Circle transparency page.
Tether publishes quarterly attestation reports (not full audits) through BDO. Tether has improved its disclosures since 2022 and now holds most reserves in U.S. Treasury bills. But the reports are less frequent, less granular and not produced by a Big Four firm. Tether has said it is working toward a full audit; its transparency page shows the latest reports.
Regulamentação & Conformidade
USDC is issued by Circle, a company registered as a Money Services Business with FinCEN, licensed in multiple U.S. states, and authorised to issue USDC in the EU under MiCA (Regulation (EU) 2023/1114). Circle listed on the New York Stock Exchange in June 2025, which subjects it to SEC reporting and public financial disclosures.
USDT is issued by Tether Limited, incorporated in the British Virgin Islands. While Tether operates globally and has obtained some regional licenses, it is not subject to the same regulatory oversight as Circle. This gives Tether more operational flexibility but provides users with fewer legal protections.
Suporte à Cadeia & Liquidez
USDT is available on more blockchains and dominates on Tron, where a large share of peer-to-peer transfers happen because fees are very low. It is the default quote currency on Binance, OKX, Bybit and most non-U.S. exchanges.
USDC covers fewer chains but has a strong presence on Ethereum, Solana, Base (Coinbase's Layer 2), Arbitrum and Optimism. Circle's CCTP lets you move native USDC between supported chains without a third-party bridge.
Integração DeFi
USDC is the preferred stablecoin across most major DeFi protocols. Aave, Compound, Morpho, Spark and Sky (formerly MakerDAO) all give USDC a central role in their lending markets. Many protocols use USDC as a core collateral type because its backing is easy to verify. DefiLlama tracks how much of each stablecoin sits in DeFi protocols (its total value locked, or TVL); check the live figure there.
USDT is also supported across DeFi but plays a smaller role on-chain relative to its total market cap. Much of USDT's volume lives on centralized exchanges. In DeFi, USDT is particularly strong in Curve pools and as a trading pair on DEXs, but it is less commonly used as collateral in lending protocols.
Histórico de Depeg
USDC had its most serious depeg in March 2023 when Silicon Valley Bank failed. Circle had disclosed about $3.3 billion of reserves at SVB, and USDC fell to about $0.87 on secondary markets. The peg was restored within days after the U.S. Treasury, the Federal Reserve and the FDIC announced that all SVB depositors would be made whole. Circle has since spread its cash across more banking partners.
USDT has seen minor depeg events (dips to roughly $0.95-$0.97) during periods of extreme market fear, but no single large episode comparable to USDC's SVB weekend. During that weekend, USDT briefly traded above $1 as traders moved out of USDC.
Tabela de Comparação Detalhada
A side-by-side breakdown of the metrics that matter when choosing between USDT and USDC. Supply figures are from DefiLlama as of September 2026; check the live values before acting.
| Métrica | USDT (Tether) | USDC (Circle) |
|---|---|---|
| Market Cap | About $184 billion (DefiLlama, Sept 2026) | About $74 billion (DefiLlama, Sept 2026) |
| Emissor | Tether Limited (BVI) | Circle (EUA, negociada publicamente) |
| Ano de Lançamento | 2014 | 2018 |
| Reserva de Garantia | Títulos do Tesouro dos EUA, dinheiro, empréstimos garantidos, outros investimentos | Dinheiro + apenas títulos do Tesouro dos EUA de curto prazo |
| Auditoria / Atestado | Quarterly attestation (BDO) | Atestado mensal (Deloitte) |
| Cadeias Suportadas | Many (Ethereum, Tron, Solana, BNB Chain, TON...) | Many (Ethereum, Solana, Base, Arbitrum...), no Tron |
| Role in DeFi | Mostly exchanges and DEX pools | Core lending and collateral asset |
| Volume de negociação 24h | Highest of any stablecoin | Lower (see CoinGecko) |
| Pior evento de desparidade | About $0.95 (brief) | About $0.87 (SVB, March 2023, recovered in days) |
| Regulamentação | Limited (BVI-incorporated) | FinCEN, licenças estaduais, MiCA |
| Melhor para | Negociação CEX, remessas, liquidez | DeFi, poupança, uso institucional |
Ganhe 7,50% APY em USDC
Coinstancy Dollar Savings lets you earn 7.50% APY on your USDC (the rate currently in force, which may be revised). Interest accrues every second and is automatically reinvested. No lock-up, withdraw anytime.
Comece a ganhar na CoinstancyQual Stablecoin Você Deve Usar para DeFi?
Se você está ativo em finanças descentralizadas, a escolha entre USDT e USDC tem consequências práticas para as estratégias disponíveis para você, os rendimentos que pode obter e o perfil de risco de suas posições.
USDC is the DeFi standard. Most large lending protocols, including Aave, Compound, Morpho and Spark (part of the Sky ecosystem), run USDC as a primary stablecoin market. That means deeper liquidity, competitive rates and more composability with other DeFi building blocks. When protocols need a stablecoin with verifiable reserves for collateral and liquidation logic, they usually pick USDC.
USDT dominates centralized exchange (CEX) trading and Curve pools. If your strategy involves trading on centralized exchanges or providing liquidity to Curve's stablecoin pools (such as 3pool), USDT remains essential. Its trading volume means tighter spreads and faster fills. Many arbitrage strategies between CEXs and decentralized exchanges (DEXs) rely on USDT's liquidity.
Our recommendation: Use USDC for lending, borrowing, and yield strategies where you want maximum transparency and protocol support. Use USDT when you need raw liquidity for trading or arbitrage. Many experienced DeFi users hold both and swap between them on Curve as needed.
Use USDC para
- Empréstimos na Aave, Compound, Morpho
- Garantia em protocolos de empréstimo DeFi
- Estratégias de yield farming e poupança
- Posse de stablecoins a longo prazo
- Casos de uso institucionais ou regulados
Use USDT para
- Negociação spot e de futuros em CEX
- Remessas transfronteiriças (especialmente via Tron)
- Fornecimento de liquidez para Curve e DEX
- Arbitragem entre CEX e DEX
- Mercados onde USDT é o par dominante
Qual stablecoin é a melhor para poupança?
Quando você mantém stablecoins como poupança, em vez de para negociação ativa, o cálculo muda fortemente a favor do USDC. A razão é simples: a poupança requer confiança, e a confiança requer transparência.
With USDC, you can check every month that your stablecoin is backed by cash and U.S. Treasuries at named, regulated institutions. You know the attestation firm (Deloitte), a main custodian (BNY Mellon) and the reserve fund manager (BlackRock). That level of verifiability makes it easier to judge whether each token is backed, whether you need it tomorrow or in two years.
USDT's reserves may well be adequate, but without a full audit you rely on quarterly attestations rather than a complete independent audit. For active trading, where you hold USDT for minutes or hours, that is an acceptable trade-off for many users. For savings held for months or years, many people prefer the more verifiable asset.
Coinstancy Dollar Savings pays 7.50% APY on USDC (the rate currently in force, which may be revised). Interest accrues every second and is automatically reinvested, with no lock-up, and you can withdraw anytime. We chose USDC for Dollar Savings because of its transparency. Your yield comes from on-chain strategies, and the underlying asset is one of the most transparent stablecoins in the market.
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Outras stablecoins a considerar
USDT e USDC dominam o mercado, mas várias outras stablecoins desempenham papéis especializados no ecossistema. Aqui está uma breve visão geral das alternativas mais notáveis.
GHO (Aave)
A decentralized, over-collateralized stablecoin minted through Aave. GHO is backed by crypto collateral rather than fiat reserves. Its borrow rate is set by Aave governance. GHO is much smaller than USDT or USDC; DefiLlama shows its current supply.
Leia o Guia GHOUSD1 (World Liberty Financial)
Um novo participante apoiado por títulos do Tesouro dos EUA e depósitos bancários, o USD1 pretende competir com o USDC em transparência, aproveitando parcerias institucionais. Ainda em estágio inicial com integrações DeFi limitadas, mas vale a pena observar à medida que o cenário das stablecoins evolui.
Leia o Guia USD1DAI / USDS (Sky, anteriormente Maker)
The original decentralized stablecoin, now issued alongside USDS by the Sky Protocol (formerly MakerDAO). It is over-collateralized by a mix of crypto assets and real-world assets. DAI and USDS remain a cornerstone of DeFi, especially for users who want a stablecoin not controlled by a single company. See DefiLlama for their current supply.
EURC (Circle)
Circle's euro-denominated stablecoin, pegged 1:1 to the euro. EURC is issued under MiCA and is gaining traction in European DeFi markets. It follows the same reserve and attestation standards as USDC, which makes it one of the most transparent euro stablecoins available.
Fez sua escolha? Coloque o USDC em ação.
Earn 7.50% APY on USDC with Coinstancy Dollar Savings. Interest accrues every second and is automatically reinvested. No lock-up, withdraw anytime. Your stablecoins should not sit idle.
Comece a ganhar 7,50% de APYPerguntas Frequentes
O USDT ou o USDC é mais seguro?
O USDT e o USDC podem perder sua paridade?
Qual stablecoin tem taxas mais baixas?
Posso converter USDT para USDC facilmente?
Why does Coinstancy Dollar Savings use USDC?
Qual stablecoin é a melhor para iniciantes?
Continuar aprendendo
Explore mais guias sobre stablecoins, estratégias DeFi e fundamentos de criptomoedas.
O que é APY em cripto?
Entenda o rendimento percentual anual, como funciona a capitalização e como comparar os rendimentos DeFi.
Ler GuiaGuia da Stablecoin GHO
Tudo sobre a stablecoin descentralizada da Aave's: como funciona, emissão e governança.
Ler GuiaGuia da Stablecoin USD1
Aprenda sobre a stablecoin da World Liberty Financial, seu respaldo e como ela se compara ao USDC.
Ler GuiaGanhe 7,50% de APY em USDC com a Coinstancy
USDC is one of the most transparent stablecoins on the market. Coinstancy Dollar Savings lets you earn 7.50% APY on your USDC. Interest accrues every second and is automatically reinvested. No lock-up, withdraw anytime. Your savings deserve both yield and transparency.
Comece a ganhar na CoinstancyFontes e leitura adicional
Os números e as afirmações nesta página baseiam-se nos documentos abaixo. Os números sensíveis ao tempo (taxas, rendimentos, comissões, dados de mercado) mudam: verifique o valor atual na fonte antes de agir com base nele.
- Circle, USDC transparency and reserve reportscircle.com
Monthly reserve composition and the independent attestation for USDC.
- Tether, transparency and reserve attestationstether.to
Quarterly attestations and the current breakdown of USDT reserves.
- DefiLlama, stablecoins dashboard (live aggregator)defillama.com
Circulating supply of USDT, USDC and other stablecoins; figures on this page were read in September 2026.
- CFTC press release 8450-21, Tether and Bitfinex orderscftc.gov
The $41 million penalty against Tether announced in October 2021.
- New York Attorney General, Bitfinex and Tether settlementag.ny.gov
The $18.5 million settlement of February 2021.
- FDIC, joint statement on Silicon Valley Bank (March 12, 2023)fdic.gov
The decision to make all SVB depositors whole, which ended the USDC depeg.
- EUR-Lex, Regulation (EU) 2023/1114 (MiCA)eur-lex.europa.eu
The EU framework under which USDC and EURC are issued in Europe.
Última revisão: setembro de 2026. Os links externos abrem em uma nova aba; a Coinstancy não é responsável pelo seu conteúdo.
USDC é a escolha clara para poupança
Transparent reserves, regulated issuer, and 7.50% APY with Coinstancy Dollar Savings. Start earning today.