USDT (Tether) and USDC (USD Coin) are the two largest stablecoins. Both aim to stay worth one US dollar, both run on several blockchains, and both are accepted almost everywhere in crypto. The differences are in who issues them, how their reserves are reported and where they are most widely used.
Who issues them
- USDT is issued by Tether, a company that launched the token in 2014. It is the oldest major stablecoin and the one with the largest circulating supply.
- USDC is issued by Circle, a US-based payments company, and launched in 2018. Circle positions it as a regulated, reserve-backed digital dollar.
How the peg works
Both tokens are fiat-backed: for every token in circulation, the issuer says it holds reserves of roughly equal value, mainly cash, cash equivalents and short-term US government debt. Approved institutional customers can mint new tokens by depositing dollars and redeem tokens for dollars, which keeps the market price close to $1.
Neither token is guaranteed to stay at exactly $1. Both have traded briefly below the peg during stress events — USDC notably in March 2023, when part of its reserves was held at a bank that failed, before recovering within days.
Transparency and reporting
Circle publishes regular reserve reports with independent attestations, and its reserves are largely held in a dedicated money market fund. Tether also publishes periodic attestations of its reserves prepared by an accounting firm. Each issuer's website lists its current reports, and it is worth reading them directly rather than relying on summaries.
Networks
| Network | USDT | USDC |
|---|---|---|
| Ethereum (ERC20) | Yes | Yes |
| Tron (TRC20) | Yes — very widely used | No longer actively supported by Circle |
| BNB Smart Chain (BEP20) | Yes | Yes |
| Solana (SPL) | Yes | Yes |
| Arbitrum, Base, Polygon | Arbitrum and Polygon | Yes, issued natively by Circle |
In practice, USDT dominates on Tron, while USDC is the default dollar on many Ethereum layer-2 networks such as Base. Always check which networks the receiver supports before sending.
Which one should you use?
- Paying someone or depositing to an exchange: use whichever stablecoin and network they accept. Compatibility matters more than any other factor.
- Using DeFi apps on Ethereum layer 2s: USDC is often the more common pair.
- Moving dollars cheaply between exchanges: USDT on Tron is widely supported, and both tokens are available on low-cost networks like Solana.
- Holding dollars for a long time: read both issuers' reserve reports and decide which you are more comfortable with. Many people simply split between the two.
Can you convert USDC to USDT?
Yes. Because both track the dollar, the rate is usually very close to 1:1, minus fees. You can swap USDC to USDT or USDT to USDC, and also change network at the same time — for example USDC on Solana to USDT on Tron. The form at the top of this page shows the exact amount you receive before you send.
Key differences at a glance
- Issuer: Tether (USDT) vs Circle (USDC).
- Size: USDT has the larger supply; USDC is the second largest.
- Strongest network: Tron for USDT; Ethereum and its layer 2s for USDC.
- Peg: both target $1 and both have deviated briefly in the past.
Related: BEP20 vs ERC20 and USDT on Solana.
Decimals, contracts and other technical details
On Ethereum, both USDT and USDC use 6 decimal places, so 1 token is represented as 1,000,000 base units. Each token has its own contract address on every network it lives on — for example, USDT on Ethereum is 0xdAC17F958D2ee523a2206206994597C13D831ec7 and USDC on Ethereum is 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48. Wallets add the official contracts automatically, but if you ever add a token manually, verify the contract on the issuer's website first, because counterfeit tokens with the same name and symbol exist.
Freezing and compliance
Both issuers can freeze tokens held at specific addresses, typically in response to law-enforcement requests or sanctions. This is part of how centrally issued stablecoins work and applies to both USDT and USDC. For ordinary users it rarely matters, but it is one of the reasons stablecoins are not the same as cash in your pocket.
Fees when you move them
Neither USDT nor USDC charges a fee for holding it. What you pay when you move them is the network fee of the blockchain you use, paid in that chain's gas token (ETH, TRX, BNB, SOL and so on), plus any fee charged by an exchange or swap service. The network you pick usually affects cost far more than the choice between USDT and USDC.
Frequently asked questions
Is USDC safer than USDT?
Each issuer publishes reserve attestations. Which one you trust more depends on your view of their reporting and reserves; neither is risk-free.
Is 1 USDC always equal to 1 USDT?
Usually very close, but not exactly. Market prices move slightly, and swaps include a service fee and a network fee.
Can I send USDC to a USDT address?
No. They are different tokens. Sending USDC to an address that only expects USDT may mean the receiver is not credited. Swap first.