Sky Dollar vs United Stables — side-by-side comparison of supply, chains, backing, and peg data.
| Metric | USDS | U |
|---|---|---|
| USD circulation value | $6.54B | $1.08B |
| Rank (by USD value) | #3 | #16 |
| Peg | USD | USD |
| Mechanism | crypto-backed | crypto-backed |
| Backing | Backed by DAI/USDC | Stablecoin basket |
| Chains deployed | 7 | 3 |
| Primary chain | Ethereum | BSC |
| Issuer | Sky Dollar | United Stables |
| CoinGecko | View → | View → |
Both USDS and U track USD, but they differ in backing and issuer. USDS is backed by backed by dai/usdc while U is backed by stablecoin basket. As of today, USDS ranks #3 and U ranks #16 among tracked stablecoins.
USDS is larger, with $6.54B in circulation vs $1.08B for U. That's roughly 6.1× the size.
Neither USDS nor U is inherently "safer" — safety depends on the specific backing composition, issuer transparency, redemption rights, and regulatory oversight. USDS uses crypto-backed backing model; U uses crypto-backed. Users should read each issuer's most recent reserve attestation before choosing.
Yes. USDS 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.
The right choice depends on your use case. Consider: which chain do you need? USDS is available on 7 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.