USDCvsUSDD
USD Coin vs USDD — side-by-side comparison of supply, chains, backing, and peg data.
Side-by-side
USDC — USD Coin
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 USDC supply moved -1.6% and USDD +7.9% — USDD grew faster. USDC held the tighter band: worst deviation 5 bps against 29 bps.
Key differences
- USDC is roughly 47.9× larger than USDD by USD circulation value ($72.21B vs $1.51B).
- USDC ranks #2 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.
- USDC is a fiat-backed stablecoin; USDD is crypto-backed. Different mechanism, different failure modes.
- Reserves differ — USDC holds cash & t-bills, USDD holds algo + trx collateral.
- USDC is deployed on 154 chains — much broader coverage than USDD's 4.
- Primary chain differs — most USDC supply lives on Ethereum, while most USDD supply is on Tron.
Full comparison table
| Metric | USDC | USDD |
|---|---|---|
| USD circulation value | $72.21B | $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 | Circle | TRON DAO Reserve |
| CoinGecko | View → | View → |
Frequently Asked Questions
What's the main difference between USDC and USDD?
Both track USD, so they compete for the same use cases. USDC holds cash & t-bills; USDD holds algo + trx collateral. USDC ranks #2 by USD value and USDD ranks #13.
Which is bigger, USDC or USDD?
USDC is larger, with $72.21B in circulation vs $1.51B for USDD. That's roughly 47.9× the size.
Is USDC 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. USDC uses a fiat-backed model; USDD uses a crypto-backed one. Read each issuer's most recent reserve attestation before choosing.
Can I convert between USDC and USDD?
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.
Should I choose USDC or USDD?
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.