USD Coin vs USDD — side-by-side comparison of supply, chains, backing, and peg data.
| Metric | USDC | USDD |
|---|---|---|
| USD circulation value | $73.47B | $1.51B |
| Rank (by USD value) | #2 | #13 |
| Peg | USD | USD |
| Mechanism | fiat-backed | crypto-backed |
| Backing | Cash & T-bills | Algo + TRX collateral |
| Chains deployed | 154 | 4 |
| Primary chain | Ethereum | Tron |
| Issuer | USD Coin | USDD |
| CoinGecko | View → | View → |
Both USDC and USDD track USD, but they differ in backing and issuer. USDC is backed by cash & t-bills while USDD is backed by algo + trx collateral. As of today, USDC ranks #2 and USDD ranks #13 among tracked stablecoins.
USDC is larger, with $73.47B in circulation vs $1.51B for USDD. That's roughly 48.8× the size.
Neither USDC nor USDD is inherently "safer" — safety depends on the specific backing composition, issuer transparency, redemption rights, and regulatory oversight. USDC uses fiat-backed backing model; USDD uses crypto-backed. Users should read each issuer's most recent reserve attestation before choosing.
Yes. USDC 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? USDC is available on 154 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.