Sky Dollar vs USDD — side-by-side comparison of supply, chains, backing, and peg data.
| Metric | USDS | USDD |
|---|---|---|
| USD circulation value | $6.54B | $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 Dollar | USDD |
| CoinGecko | View → | View → |
Both USDS and USDD track USD, but they differ in backing and issuer. USDS is backed by backed by dai/usdc while USDD is backed by algo + trx collateral. As of today, USDS ranks #3 and USDD ranks #13 among tracked stablecoins.
USDS is larger, with $6.54B in circulation vs $1.51B for USDD. That's roughly 4.3× the size.
Neither USDS nor USDD is inherently "safer" — safety depends on the specific backing composition, issuer transparency, redemption rights, and regulatory oversight. USDS uses crypto-backed backing model; USDD uses crypto-backed. Users should read each issuer's most recent reserve attestation before choosing.
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.
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.