Tether vs USDC
Tether (USDT) ranks #3 by market capitalization at $183.4B and USDC (USDC) ranks #6 at $74.6B, as of September 5, 2026. Tether has no fixed supply cap; USDC has no fixed supply cap. Tether is available on 21 exchanges we have verified and USDC on 25; 17 list both.
Verified How we verify
Side-by-Side
 Tether |  USDC | |
|---|---|---|
| Market cap rank | #3 | #6 |
| Price | $1.00 | $1.00 |
| Market cap | $183.4B | $74.6B |
| Fully diluted valuation | $188.9B | $74.6B |
| 24-hour volume | $61.8B | $16.4B |
| Circulating supply | 183.4B USDT | 74.6B USDC |
| Maximum supply | No fixed cap | No fixed cap |
| All-time high | $1.32 (July 23, 2018) | $1.04 (November 14, 2018) |
| Change from all-time high | −24.4% | −4.2% |
| 7-day change | 0.0% | 0.0% |
| 30-day change | +0.1% | 0.0% |
| Category | stablecoin | stablecoin |
| Chains | 11 chains including Ethereum, Klay Token, and Tezos | 35 chains including Ethereum, Monad, and Sui |
| Launched | — | — |
Where You Can Buy Each
| Tether | USDC | |
|---|---|---|
| Exchanges listing it | 21 | 25 |
| Countries and US states with a ranked buy page | 70 | 70 |
17 exchanges list both; 70 locations have a ranked buy page for both.
Frequently Asked Questions
- Which has the larger market cap, Tether or USDC?
- Tether, by about 2.5× as of September 5, 2026: $183.4B for Tether against $74.6B for USDC.
- Does Tether or USDC have a fixed supply?
- Neither has a fixed maximum supply.
- Where can I buy both Tether and USDC?
- 17 exchanges we have verified list both. Pick your location on the buy pages to see which serve you and what a $500 purchase costs.