USDDvsU
USDD vs United Stables — side-by-side comparison of supply, chains, backing, and peg data.
Side-by-side
USDD — USDD
U — United Stables
30-day peg stability dotted line = target · both charts share one scale
What the last 30 days show
Over the last 30 days USDD supply moved +7.9% and U +17.4% — U grew faster. U held the tighter band: worst deviation 9 bps against 29 bps.
Key differences
- USDD is roughly 1.2× larger than U by USD circulation value ($1.51B vs $1.21B).
- USDD ranks #13 while U ranks #15 among all tracked stablecoins.
- Both are pegged to the same currency (USD), so they compete directly for the same use cases.
- Both are crypto-backed stablecoins, so the mechanism is not what separates them.
- Reserves differ — USDD holds algo + trx collateral, U holds stablecoin basket.
- Chain coverage is comparable: USDD on 4 chains, U on 3.
- Primary chain differs — most USDD supply lives on Tron, while most U supply is on BSC.
Full comparison table
| Metric | USDD | U |
|---|---|---|
| USD circulation value | $1.51B | $1.21B |
| Rank (by USD value) | #13 | #15 |
| Peg | USD | USD |
| Mechanism | crypto-backed | crypto-backed |
| Backing | Algo + TRX collateral | Stablecoin basket |
| Chains deployed | 4 | 3 |
| Primary chain | Tron | BSC |
| Issuer | TRON DAO Reserve | — |
| CoinGecko | View → | View → |
Frequently Asked Questions
What's the main difference between USDD and U?
Both track USD, so they compete for the same use cases. USDD holds algo + trx collateral; U holds stablecoin basket. USDD ranks #13 by USD value and U ranks #15.
Which is bigger, USDD or U?
USDD is larger, with $1.51B in circulation vs $1.21B for U. That's roughly 1.2× the size.
Is USDD safer than U?
Neither is inherently safer. Safety turns on reserve composition, issuer transparency, redemption rights and regulatory oversight — none of which this page audits. Both use a crypto-backed model, so the difference sits in the issuer and the reserves rather than the design. Read each issuer's most recent reserve attestation before choosing.
Can I convert between USDD and U?
Yes. USDD and U both trade on major centralized and decentralized exchanges. Since both track USD, the exchange rate is typically very close to 1:1. Direct swap protocols on Ethereum, Solana, and other chains offer the tightest spreads.
Should I choose USDD or U?
The right choice depends on your use case. Consider: which chain do you need? USDD is available on 4 chains and U on 3. What backing do you prefer? What's your integration surface (exchanges, DeFi protocols, payment providers)? Both have deep liquidity, so market cap alone shouldn't decide it.