USDT vs ZKUSD
Tether and zkUSD Dollar, compared on the things that decide whether you get your dollar back. Live data, updated continuously.
30-day peg gap and USDT/ZKUSD spread
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The largest dollar token on-chain, backed mainly by US Treasury bills and cash equivalents. Direct redemption is available to verified institutional customers above a minimum size; everyone else exits via secondary markets.
Verdict band: Adequate
zkUSD Dollar is a dollar-denominated token tracked across 1 chains. No verified issuer disclosure is on file, so its collateral and legal structure score conservatively.
Verdict band: Caution
| Safety scoreComposite of collateral, peg, liquidity, issuer and track record. | ●●●●●5 of 5 | 76 | 53 | USDT |
|---|---|---|---|---|
| Collateral qualityWhat actually backs the token, and how liquid that backing is. | ●●●●●5 of 5 | 78 | 55 | USDT |
| Exit liquidityWhether you can leave at size without moving the price. | ●●●●●5 of 5 | $3.55B | $0.00 | USDT |
| Issuer & legal standingRegulatory perimeter, disclosure quality and redemption rights. | ●●●●4 of 5 | 54 | 48 | USDT |
| Peg tightness (live)Absolute distance from $1.00 right now — smaller is better. | ●●●●4 of 5 | −0.061% | −0.029% | ZKUSD |
| Worst recorded depegHow badly the token has broken before, as a stress precedent. | ●●●●4 of 5 | -4.8% | None recorded | ZKUSD |
| Track recordYears live and behaviour through past stress events. | ●●●●4 of 5 | 100 | 53 | USDT |
| Scale / market capBigger float usually means broader venue support and tighter spreads. | ●●●3 of 5 | $182.94B | $1.18M | USDT |
| Chain reachNumber of networks where the token is natively deployed. | ●●●3 of 5 | 104 chains | 1 chains | USDT |
| Best available yieldUpside — but every extra point above T-bills is paid for with risk. | ●●2 of 5 | 17.67% | None | USDT |
"Matters" is our weighting of how much each dimension typically drives a real allocation decision. Sort any column to re-rank the tradeoffs by what matters to you.
The short answer
USDT scores higher on safety (76 vs 53), driven mainly by collateral quality and disclosure. USDT has deeper tracked liquidity ($3.55B), which is what determines whether you can exit at size. USDT currently earns up to 17.67% — remember that any rate above the T-bill yield is payment for a risk.
If both are fiat-reserve tokens, note that holding both is not diversification: they share the same short-dated Treasury and banking exposure. Genuine diversification means mixing collateral structures.
Which one fits your goal: USDT or ZKUSD?
Capital preservation over everything else.
For park cash safely, USDT is the better fit over ZKUSD.
- Safety score 76 vs 53, with collateral rated 78/100.
- Current peg deviation -0.061% against -0.029% for ZKUSD.
- USDT has 2 recorded depeg event(s) — read them before sizing up.
Concentrating in one issuer is a single point of failure regardless of score. Split across collateral structures.
Key risks, side by side
USDT
- Issuer and banking risk: reserves sit with Tether under El Salvador / BVI rules.
- Depeg history: 2 recorded event(s), worst deviation -4.80%.
- Attestation cadence: quarterly.
- Yield venue risk: 17.67% is earned outside the token itself.
ZKUSD
- Collateral volatility: a fast drawdown in backing assets can force liquidations.
- No depeg recorded in our incident log — absence of history is not a guarantee.
- Limited public attestation of reserves.
- Chain concentration: 100% of supply sits on ZKsync Era.
| Metric | USDT | ZKUSD |
|---|---|---|
| Category | Stablecoin | Stablecoin |
| Issuer | Tether | Undisclosed |
| Jurisdiction | El Salvador / BVI | Not documented |
| Collateral | fiat-reserves | crypto-backed |
| Peg mechanism | fiat-backed | crypto-backed |
| Attestation | quarterly | none |
| Redemption | gated | market-only |
| Price | $0.9994 | $0.9997 |
| Peg deviation | −0.061% | −0.029% |
| Market cap | $182.94B | $1.18M |
| 7d supply change | +0.51% | 0.00% |
| Liquidity | $3.55B | $0.00 |
| Best yield | 17.67% (azuro · Polygon) | None |
| Chains | 104 | 1 |
| Launched | 2014 | — |
| Worst recorded depeg | −4.8% | None recorded |
Spread, peg gap and switching cost
- Price spread (USDT vs ZKUSD)
- -3.2 bps
- $0.9994 vs $0.9997
- Peg deviation gap
- 0.032 pp
- USDT −0.061% · ZKUSD −0.029%
- Yield spread
- +17.67%
- USDT 17.67% · ZKUSD —
- Liquidity ratio
- —
- $3.55B vs $0.00
A round trip between USDT and ZKUSD costs roughly the market spread plus venue fees. At 3.2 bps of price gap, swapping $1M implies about $320.17 of price impact before fees — usually only worth it if the peg gap or yield spread is durable, not intraday noise.
Historical context
Track record is the part of a stablecoin you cannot model — it has to be observed. Here is how USDT and ZKUSD have actually behaved since launch, including every stress event we have on record.
- USDT
Tether goes live.
- USDT
Launched as Realcoin on Bitcoin's Omni layer, later renamed Tether.
- USDT
NYAG filings reveal reserves were not fully cash-backed at the time.
- USDT
Settles with the NY Attorney General; agrees to quarterly reserve reporting.
- USDT
Terra contagion run (worst deviation -4.8%).
- USDT
Shifts reserves decisively toward short-dated US Treasury bills.
- USDT
Banking stress (worst deviation 0.5%).
Chain coverage
USDT is live on 104 chains, ZKUSD on 1. 1 chains carry both, so bridging is only unavoidable for the 103 networks where just one of them is deployed.
| Chain | USDT | ZKUSD | Both available |
|---|---|---|---|
| $90.48B | — | USDT only | |
| $74.11B | — | USDT only | |
| $9.18B | — | USDT only | |
| $2.86B | — | USDT only | |
| $976.40M | — | USDT only | |
| $852.67M | — | USDT only | |
| $832.74M | — | USDT only | |
| $689.07M | — | USDT only | |
| $680.37M | — | USDT only | |
| $437.41M | — | USDT only | |
| $382.35M | — | USDT only | |
| $228.34M | — | USDT only | |
| $193.06M | — | USDT only | |
| $113.11M | — | USDT only | |
| $100.25M | — | USDT only | |
| $82.91M | — | USDT only | |
| $79.99M | — | USDT only | |
| $78.87M | — | USDT only | |
| $77.59M | — | USDT only | |
| $64.33M | — | USDT only |
USDT vs ZKUSD: frequently asked questions
Is USDT or ZKUSD safer?
+
On our composite safety score USDT rates 76/100 versus 53/100 for ZKUSD. The score weighs collateral quality (fiat-reserves vs crypto-backed), redemption rights, attestation quality, peg history and liquidity depth. A higher score is not a guarantee: both remain issuer-credit and smart-contract exposures, not insured bank deposits.
What is the difference between USDT and ZKUSD?
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Tether is issued by Tether (El Salvador / BVI), backed by fiat-reserves, with redemption terms: gated. zkUSD Dollar is issued by Undisclosed (Not documented), backed by crypto-backed, with redemption terms: market-only. Attestation coverage is "quarterly" for USDT and "none" for ZKUSD.
Which has the bigger market cap, USDT or ZKUSD?
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USDT is larger at $182.94B in circulating supply, against $1.18M for the other. Over the last 7 days supply moved +0.51% for USDT and 0.00% for ZKUSD.
Are USDT and ZKUSD trading at $1.00 right now?
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USDT trades at $0.9994 (−0.061% off peg) and ZKUSD at $0.9997 (−0.029% off peg). The gap between the two is about 3.2 basis points, which is the cost you pay when rotating size between them before fees.
Has USDT or ZKUSD ever depegged?
+
USDT: worst recorded deviation −4.8%. ZKUSD: no material depeg recorded in our incident set. Past peg behaviour under stress is the single best available proxy for how a token trades in the next crisis.
Which is better for large institutional size, USDT or ZKUSD?
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For block size the constraint is exit liquidity and primary redemption, not headline supply. USDT shows deeper on-chain liquidity at $3.55B versus $0.00. Combine that with the redemption channel — USDT: gated; ZKUSD: market-only — and size trades against the primary window rather than the order book where possible.
Can I earn yield on USDT or ZKUSD?
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USDT currently shows the higher rate at 17.67% via azuro · Polygon, against no tracked rate for ZKUSD. Neither token pays interest by holding it in a wallet: the yield comes from lending, liquidity provision or a wrapped yield-bearing version, each with its own counterparty and contract risk.
Which chains support both USDT and ZKUSD?
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Both are deployed on 1 shared network, including ZKsync Era. USDT spans 104 chains in total and ZKUSD spans 1. Bridged supply on a chain is not the same as natively issued supply, and it usually carries the bridge's risk rather than the issuer's.
What does it cost to switch from USDT to ZKUSD?
+
Budget three components: the current price spread of roughly 3.2 bps, swap or venue fees, and slippage against available depth ($3.55B for USDT, $0.00 for ZKUSD). For meaningful size, redeeming with the issuer and minting the other side is often cheaper than a secondary-market swap.
Is USDT or ZKUSD regulated?
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USDT is issued from El Salvador / BVI with quarterly; ZKUSD is issued from Not documented with none. Regulatory status varies by your own jurisdiction and by whether the token is offered under a specific stablecoin regime, so treat this as a starting point for diligence, not legal advice.