USDT vs USDC: Which stablecoin is safer for Brazilian companies?

The question frequently arises in board meetings, treasury committees, and conversations with legal teams of companies structuring operations with digital assets: USDT or USDC? Both are dollar-pegged, both maintain 1:1 parity with USD, and both circulate on major blockchain networks. But the similarities stop there.

Beneath the surface, USDT and USDC are instruments with substantially different risk profiles, transparency levels, and regulatory positioning. For a retail user sending occasional remittances, these differences are minor. For a company that needs to justify its choices to auditors, regulators, and investors, they are critical.

This article compares USDT and USDC on the criteria that matter for the Brazilian corporate landscape in 2026: reserve quality, audit transparency, regulatory standing, operational liquidity, and the impact of BCB Resolution 521.

2. What Are USDT and USDC

USDT (Tether) was launched in 2014 by Tether Limited, managed by iFinex, a Hong Kong-based company that also controls the Bitfinex exchange. With a market capitalization around $144 billion in March 2026, USDT is the third-largest cryptocurrency globally, trailing only Bitcoin and Ethereum. It is present on over 50 blockchain networks.

USDC was launched in 2018 by Circle in partnership with Coinbase, through the Centre Consortium. From its inception, its stated goal was regulatory compliance and institutional transparency. In March 2026, USDC operated natively on 32 blockchain networks, including Ethereum, Solana, Base, Arbitrum, Avalanche, and Polygon.

Both promise the same: each issued token is backed active by $1.00 in reserves. The difference lies in how each issuer fulfills — and proves — this promise.

3. Reserve Quality and Composition

The most significant difference between USDT and USDC is the composition and auditability of the reserves backing each token.

USDC Reserves

Circle holds USDC reserves exclusively in cash and short-term US Treasury bills. Circle publishes monthly reserve attestation reports conducted by Grant Thornton LLP, alongside annual financial audits led by Deloitte & Touche LLP.

This means any company, investor, or regulator can verify monthly whether the circulating token volume matches the declared reserves. The audit trail is public, periodic, and conducted by top-tier global firms.

USDT Reserves

Tether maintains diversified reserves that include USD, securities, and other assets. In March 2026, the company hired KPMG to perform its first complete financial audit, with PwC assisting in the preparatory phase — a move signaling Tether's commitment to bank-grade transparency standards. Until this audit is complete, reports are published quarterly in a snapshot format, confirming assets exceed liabilities on the date of verification.

For a company needing audit documentation in ESG reports, investor due diligence, or regulatory accounting, this distinction is legally relevant.

Reserve Comparison:

4. Regulatory Position in 2026 and the Impact of BCB 521

USDC and MiCA Compliance

USDC complies fully with the EU’s Markets in Crypto-Assets (MiCA) Regulation, making it the safest option for European users. USDT is currently not compliant with MiCA.

For Brazilian companies with European operations or seeking capital from European investors, this difference has immediate practical impact: USDT acceptance in regulated European structures is restricted, while USDC operates within the European regulatory perimeter.

USDC and the US Market

Circle operates under money transmitter licenses across all relevant US states and is subject to state regulatory oversight. This US compliance structure allows USDC to integrate directly with institutional financial products like Visa, Stripe, and large asset managers.

The Impact of BCB 521 in Brazil

With BCB Resolution 521 in force since February 2026, operations with stablecoins referentially linked to foreign currency use are classified as foreign exchange actions. This affects both USDT and USDC equally in terms of FX classification.

The practical difference lies in the compliance documentation each token allows. For transactions requiring a verifiable audit trail, USDC offers monthly public reports that can be cited in operational files. USDT offers quarterly snapshots with less granularity.

5. Liquidity and Operational Usability

Here, USDT enjoys an unambiguous advantage. USDT is the preferred choice for high-frequency trading and arbitrage due to its immense market depth. This volume translates to superior liquidity on Brazilian and global exchanges, yielding tighter spreads when converting to Brazilian Reais (BRL).

For companies needing to convert large volumes quickly — for example, an exporter receiving $500,000 in stablecoins and wanting to convert to BRL on the same day — USDT’s market depth is operationally relevant.

USDT operates on more legacy blockchains, whereas USDC is deeply integrated into Western banking infrastructure. This means USDT reaches markets and platforms where USDC has no native presence, especially in Asian markets and mid-tier exchanges.

For operations within the traditional financial ecosystem — banks, funds, regulated platforms — USDC maintains deeper integration with Western infrastructure.

6. Fund Freezing Risks

Both stablecoins are centralized, meaning issuers have the technical capability to freeze specific addresses at the request of regulatory authorities.

USDC has exercised this power in documented cases: notably after the Tornado Cash sanctions in 2022, Circle froze addresses linked to the protocol in compliance with US OFAC orders. This displays both technical capability and regulatory cooperativeness.

Tether has also frozen addresses at the behest of authorities, though historical data shows less frequent public documentation.

For businesses, the freezing risk is real on both sides, though USDC's coordination with US regulators is more predictable, which is positive for firms operating within legal boundaries but could be a constraint in jurisdictions with conflicting US regulatory frameworks.

7. Operational Costs: Which Is Cheaper for Brazilian Firms?

The cost of operating with USDT or USDC depends primarily on the underlying blockchain network rather than the stablecoin itself.

On the Tron network (TRC-20), USDT transfers are extraordinarily cost-effective, making it the most accessible option for peer-to-peer and remittance flows. On Ethereum (ERC-20), both USDT and USDC can incur gas fees ranging from $1 to over $15 depending on congestion. On Solana, both transact for fractions of a cent.

For Brazilian companies prioritizing transaction costs on recurring low-value payments, USDT on Tron offers the lowest cost. For operations requiring auditability and integration with Western financial infrastructure, USDC on Solana or Polygon offers the ideal balance of cost and compliance.

8. Which to Choose: The Decision by Corporate Profile

When USDC Is the Safest Choice

USDC is the most suitable choice when:

• The company must document stablecoin use for external auditors, ESG reports, or institutional investor accounting;
• Operations involve European or US counterparties requiring MiCA-compliant assets;
• The company is structuring operations within the scope of BCB 521 and needs verifiable monthly audit trails.

When USDT Can Be Utilized

USDT is appropriate when:

• The priority is maximum liquidity and tightest exchange spreads;
• Operations involve counterparties in jurisdictions where USDC penetration is low;
• The transaction volumes make Tron network fee savings highly material;
• The company has internal capacity to document asset utilization and risk.

9. What Changes with KPMG Auditing USDT

The timing of hiring KPMG is no coincidence: Tether appointed Simon McWilliams as CFO in early 2026, with an explicit mandate to elevate transparency standards and prepare the firm for bank-grade audits. The RFP process was highly competitive, with Deloitte, EY, KPMG, and PwC all pitch-competing, indicating the weight of the initiative.

Once the KPMG audit is finalized, USDT will sit on the same level of verified external oversight that USDC offers today. Companies reviewing digital asset policies should monitor this audit — expected in H2 2026 — before finalizing long-term standard decisions.

10. How Avalon Structures the Decision for Companies

The choice between USDT and USDC is not technical — it is strategic and regulatory. Avalon partners with companies to define stablecoin policies aligned with BCB Resolution 521 and operational compliance mandates.

Our advisory services center on three pillars:

11. Frequently Asked Questions