USDSvsUSDD
Sky Dollar vs USDD — side-by-side comparison of supply, chains, backing, and peg data.
Side-by-side
USDS — Sky Dollar
USDD — USDD
30-day peg stability dotted line = target · both charts share one scale
What the last 30 days show
Over the last 30 days USDS supply moved -11.1% and USDD +7.9% — USDD grew faster. USDS held the tighter band: worst deviation 4 bps against 29 bps.
Key differences
- USDS is roughly 4.4× larger than USDD by USD circulation value ($6.70B vs $1.51B).
- USDS ranks #3 while USDD ranks #13 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 — USDS holds backed by dai/usdc, USDD holds algo + trx collateral.
- USDS is deployed on 7 chains — much broader coverage than USDD's 4.
- Primary chain differs — most USDS supply lives on Ethereum, while most USDD supply is on Tron.
Full comparison table
| Metric | USDS | USDD |
|---|---|---|
| USD circulation value | $6.70B | $1.51B |
| Rank (by USD value) | #3 | #13 |
| Peg | USD | USD |
| Mechanism | crypto-backed | crypto-backed |
| Backing | Backed by DAI/USDC | Algo + TRX collateral |
| Chains deployed | 7 | 4 |
| Primary chain | Ethereum | Tron |
| Issuer | Sky | TRON DAO Reserve |
| CoinGecko | View → | View → |
Frequently Asked Questions
What's the main difference between USDS and USDD?
Both track USD, so they compete for the same use cases. USDS holds backed by dai/usdc; USDD holds algo + trx collateral. USDS ranks #3 by USD value and USDD ranks #13.
Which is bigger, USDS or USDD?
USDS is larger, with $6.70B in circulation vs $1.51B for USDD. That's roughly 4.4× the size.
Is USDS safer than USDD?
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 USDS and USDD?
Yes. USDS and USDD 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 USDS or USDD?
The right choice depends on your use case. Consider: which chain do you need? USDS is available on 7 chains and USDD on 4. 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.