BUIDLvsU
BlackRock USD vs United Stables — side-by-side comparison of supply, chains, backing, and peg data.
Side-by-side
BUIDL — BlackRock USD
U — United Stables
30-day peg stability dotted line = target · both charts share one scale
What the last 30 days show
Over the last 30 days BUIDL supply moved +13.7% and U +17.4% — U grew faster. BUIDL held the tighter band: worst deviation 0 bps against 9 bps.
Key differences
- BUIDL is roughly 2.2× larger than U by USD circulation value ($2.71B vs $1.21B).
- BUIDL ranks #10 while U ranks #15 among all tracked stablecoins.
- Both are pegged to the same currency (USD), so they compete directly for the same use cases.
- BUIDL is a fiat-backed stablecoin; U is crypto-backed. Different mechanism, different failure modes.
- Reserves differ — BUIDL holds tokenized us treasuries (blackrock), U holds stablecoin basket.
- BUIDL is deployed on 8 chains — much broader coverage than U's 3.
- Primary chain differs — most BUIDL supply lives on Ethereum, while most U supply is on BSC.
Full comparison table
| Metric | BUIDL | U |
|---|---|---|
| USD circulation value | $2.71B | $1.21B |
| Rank (by USD value) | #10 | #15 |
| Peg | USD | USD |
| Mechanism | fiat-backed | crypto-backed |
| Backing | Tokenized US Treasuries (BlackRock) | Stablecoin basket |
| Chains deployed | 8 | 3 |
| Primary chain | Ethereum | BSC |
| Issuer | BlackRock (tokenized by Securitize) | — |
| CoinGecko | View → | View → |
Frequently Asked Questions
What's the main difference between BUIDL and U?
Both track USD, so they compete for the same use cases. BUIDL holds tokenized us treasuries (blackrock); U holds stablecoin basket. BUIDL ranks #10 by USD value and U ranks #15.
Which is bigger, BUIDL or U?
BUIDL is larger, with $2.71B in circulation vs $1.21B for U. That's roughly 2.2× the size.
Is BUIDL safer than U?
Neither is inherently safer. Safety turns on reserve composition, issuer transparency, redemption rights and regulatory oversight — none of which this page audits. BUIDL uses a fiat-backed model; U uses a crypto-backed one. Read each issuer's most recent reserve attestation before choosing.
Can I convert between BUIDL and U?
Yes. BUIDL 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.
Should I choose BUIDL or U?
The right choice depends on your use case. Consider: which chain do you need? BUIDL is available on 8 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.