USD Coin vs Sky Dollar — side-by-side comparison of supply, chains, backing, and peg data.
| Metric | USDC | USDS |
|---|---|---|
| USD circulation value | $73.47B | $6.54B |
| Rank (by USD value) | #2 | #3 |
| Peg | USD | USD |
| Mechanism | fiat-backed | crypto-backed |
| Backing | Cash & T-bills | Backed by DAI/USDC |
| Chains deployed | 154 | 7 |
| Primary chain | Ethereum | Ethereum |
| Issuer | USD Coin | Sky Dollar |
| CoinGecko | View → | View → |
Both USDC and USDS track USD, but they differ in backing and issuer. USDC is backed by cash & t-bills while USDS is backed by backed by dai/usdc. As of today, USDC ranks #2 and USDS ranks #3 among tracked stablecoins.
USDC is larger, with $73.47B in circulation vs $6.54B for USDS. That's roughly 11.2× the size.
Neither USDC nor USDS is inherently "safer" — safety depends on the specific backing composition, issuer transparency, redemption rights, and regulatory oversight. USDC uses fiat-backed backing model; USDS uses crypto-backed. Users should read each issuer's most recent reserve attestation before choosing.
Yes. USDC and USDS 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? USDC is available on 154 chains and USDS on 7. 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.