Circle USYC

Circle USYC is Circle’s tokenized money market fund product. The official website is circle.com/usyc, and Circle’s developer docs host the smart-contract reference page for USYC. The protocol is not verifiable on-chain in this run, so contract verification status is limited to explorer/issuer documentation rather than independent chain inspection.

Circle states USYC is issued by Circle International Bermuda Limited and represents an interest in a Cayman Islands mutual fund. Public sources place inception/launch around 2023-05-01. The protocol is deployed on Ethereum and BSC per Circle’s contract page; other public sources also mention additional chains, but for this request only Ethereum and BSC are relevant.

USYC has no native governance token disclosed in the sources reviewed; the product itself is the tokenized fund share. Main contract addresses reported by Circle are: Ethereum USYC 0x136471a34f6ef19fE571EFFC1CA711fdb8E49f2b and BSC USYC 0x8D0fA28f221eB5735BC71d3a0Da67EE5bC821311, with associated teller/entitlements contracts on each chain. These addresses are cross-checked by Circle’s developer documentation and secondary aggregator pages that repeat the same addresses, but explorer verification status is Not verifiable as of 2026-09-04 in this run.

On lineage, USYC is not a clean standalone fork in the usual DeFi sense; it is a tokenized-money-market product originally associated with Hashnote and later operated under Circle after Circle’s acquisition of Hashnote. Available sources do not establish a specific open-source upstream protocol fork, so the safest identification is no independently verifiable fork lineage. Changes vs. upstream are therefore Not verifiable as of 2026-09-04.

Audit status is also Not verifiable as of 2026-09-04 from the sources gathered here. For malicious-modification history in similar forks, the only defensible statement is that forked tokenized-fund deployments are common targets for address confusion and clone/phishing risk, but a USYC-specific malicious-modification history is Not verifiable as of 2026-09-04.

Circle’s USYC has clear product maturity beyond a simple landing page: Circle provides a dedicated portal with mainnet/testnet entry points and explicit subscribe/redeem UI steps, plus developer docs for contract integration and public HTTP API endpoints for price and entitlement checks. The docs also describe live operational behavior, including instant-redemption capacity and T+0/T+1 settlement for larger redemptions, which is consistent with an active product rather than a static marketing site. On UX quality, the documentation surface looks reasonably mature: there is an indexed docs site, markdown mirrors, a portal quickstart, and chain-specific contract pages for Ethereum and BSC.

No obvious broken-link or template-sign evidence is visible in the retrieved material, but that cannot be fully verified from the available evidence; Not verifiable as of 2026-09-04. The portal appears to support real subscription/redemption workflows, but access is permissioned: Circle says institutions must complete KYC/AML and wallet allow-listing before using USYC, and the public docs frame the product around eligible users rather than an open retail app. Yes, USYC has an open API in the sense of publicly documented HTTP endpoints for token price, historical price reports, and entitlement checks.

Circle’s bug bounty program is active and appears to be managed through HackerOne; a 2025 report states the program was managed by HackerOne with a maximum reward of $5,000, and a 2026 report on Circle’s Arc bounty says the program pays $150–$400 for low severity, $400–$800 for medium, $800–$3,000 for high, and $3,000–$5,000 for critical findings. The clearest start date available in the gathered material is April 9, 2026, when Circle launched the HackerOne bug bounty campaign for Arc. Publicly reported program results in the gathered material are limited to reward-structure information and submission statistics; no independently verifiable payout totals or disclosed incidents specific to USYC were found, so results are Not verifiable as of 2026-09-04.

Assessment — Dependencies & Counterparty Risk (as of September 6, 2026): USYC’s dominant dependency is off-chain. It represents shares in Hashnote International Short Duration Yield Fund Ltd., a Cayman fund investing primarily in reverse repos backed by U.S. government securities; Circle International Bermuda Limited issues/administers the token, while Circle’s acquired Hashnote affiliate manages the fund. Key counterparties: Public fund-structure evidence identifies BNY Mellon as custodian, Marex Capital Markets as prime broker/repo counterparty, NAV Fund Services (Cayman) as administrator, NAV Consulting as NAV calculation agent, and Cohen & Co. as auditor. Marex concentration creates settlement, collateral, and counterparty-default risk even where underlying Treasuries are high quality.

These arrangements are based on independent secondary research and should be confirmed against current offering documents. Oracle/manipulation risk: USYC’s NAV/price is published through an issuer-controlled on-chain oracle and public API; the design is not a permissionless market-price oracle. A stale, incorrect, delayed, or compromised NAV update could cause unfair minting/redemption, liquidation, or secondary-market pricing. The daily NAV model also creates gap risk during fast rates, repo, custody, or redemption events. Bridges and chain exposure: USYC is supported on Ethereum and BNB Smart Chain, with Circle CCTP V2 enabling transfers between them.

This adds Circle attestation, mint/burn, contract-administration, and cross-chain availability dependencies; a bridge or chain outage could strand liquidity without necessarily impairing the underlying fund. No LST, restaking, crypto lending, or yield-farming exposure was identified in the disclosed investment mandate. CEX/MM exposure: Binance institutional clients can use USYC as off-exchange derivatives collateral, with custody through supporting banks or Ceffu. This creates operational, legal, rehypothecation, and liquidation-contagion risk, although the arrangement does not prove that the fund itself lends to Binance. Failure scenarios: (1) Marex/custodian/administrator insolvency or asset-segregation failure; (2) repo counterparty or collateral-value dispute; (3) NAV-oracle compromise; (4) Circle/Hashnote operational or regulatory failure; (5) USDC liquidity or CCTP outage; or (6) rapid redemptions causing secondary-market discount/depeg.

No active dependency failure was identified in the searched sources, but Dune/on-chain verification was unavailable: Not verifiable as of September 6, 2026. Exposure percentages are likewise Not verifiable as of September 6, 2026.

USYC is organized as a fund-share structure rather than a single-wallet custodian model: each token represents a share of Hashnote International Short Duration Fund Ltd. (a Cayman Islands mutual fund), and Circle International Bermuda Limited acts as token administrator for the fund’s USYC issuance and management. The underlying fund assets are described as being held in segregated custodial accounts at the prime broker/custodian, which supports direct investor access and asset separation from the fund’s balance sheet.

On the available evidence, withdrawals/redemptions are not described as paused; the product documentation says approved clients can redeem USYC into USDC, but the live on-chain redemption status is not verifiable as of 2026-09-06.

Key-management organization — Circle USYC (as of September 4, 2026) USYC uses a centralized, permissioned control model, not fully permissionless DeFi governance:

• Legal/operational administrator: Circle International Bermuda Limited (CIBL), a Bermuda Monetary Authority–licensed digital-asset business, is identified as USYC’s token administrator. USYC represents interests in the Hashnote International Short Duration Yield Fund.
• On-chain authorization: USYC is a permissioned ERC-20. The Entitlements/Allowlist contracts control which wallets may hold, transfer, mint, or redeem USYC. The documented system can also halt transactions globally if suspicious activity is detected.
• Fund and token records: The published workflow states that the fund administrator updates the SDYF share registry, while Hashnote mints USYC corresponding to investor fund shares. This creates an operational separation between fund-record administration and blockchain token controls; the current post-acquisition allocation of signing responsibilities is not publicly detailed.
• Chain deployment: Ethereum and BSC each have separate USYC and Entitlements contracts. The same permissioned model is documented for both chains, but chain-specific administrator addresses, key holders, signing thresholds, hardware-security controls, and recovery procedures are not publicly disclosed. Risk assessment: The material trust assumption is concentrated administrative key control: authorized operators can change allowlists and stop transfers, and likely control mint/redemption permissions. Circle describes MPC and approval controls for some of its general custody products, but the available USYC materials do not establish that USYC administrative keys use MPC, a multisig, HSMs, or a stated quorum. Therefore: Not verifiable as of September 4, 2026 regarding the actual private-key storage architecture, signer count, threshold, geographic separation, rotation policy, or incident-recovery process. On-chain verification of current role holders and admin ownership is also unavailable in this run: Not verifiable as of September 4, 2026.

Assessment — Smart-contract/admin risk (as of September 6, 2026). Addresses / architecture

• Ethereum USYC proxy: 0x136471a34f6ef19fE571EFFC1CA711fdb8E49f2b; implementation: 0xBF0f2F3aAd6b99893D80c550fBaceC915545eB92; Oracle: 0x74f2199AEb743f68f05943e5715A33EaF2b61f53; Teller: 0xeE35F963BFC71b51eC95147f26c030D674ea30e6; Entitlements: 0x902D906b8d988092213bE799B18Bd2cbd64F808C.
• BSC USYC: 0x8D0fA28f221eB5735BC71d3a0Da67EE5bC821311; Cross-Chain Teller: 0xf38979E05650be7926EA07BB59C48Fb9b1DB3D08; Entitlements: 0x6B7d54003f73bE979cf92BF369432aC534853692. User → USYC proxy → implementation → Entitlements/oracle; subscriptions/redemptions route through Teller; BSC uses the Cross-Chain Teller. The Ethereum proxy is verified and exposes ERC-1967-style proxy events (AdminChanged, Upgraded, BeaconUpgraded). Etherscan records multiple historical implementation upgrades, confirming upgradeability. Controls and failure modes
• Entitlements controls transfer/holding permissions and can freeze all USYC activity; sanctions screening is also enforced through this layer.
• Normal users can redeem through the Teller without an administrative transaction, but exit is conditional on permissioning, oracle pricing, Teller liquidity, and system availability. Circle states 24/7 redemption, but this is a protocol claim rather than an independently verified guarantee.
• A compromised upgrade authority could replace logic, alter mint/burn/redemption/oracle behavior, freeze transfers, or potentially expropriate assets through malicious logic: high-severity governance/key risk. Direct arbitrary draining by the currently configured admin is Not verifiable as of September 6, 2026.
• Proxy-admin type/address, owner/admin/emergency role holders, role renunciation, fee/strategy controls, and on-chain timelock delay: Not verifiable as of September 6, 2026. Dune was unavailable; no Dune query/execution IDs exist.
• Audit status is contradictory: Circle claims an audited contract, while Etherscan shows no audit submission on the proxy page. Risk conclusion: upgradeability plus centralized Entitlements creates material freeze and key-compromise risk; users do not possess a guaranteed permissionless exit.

I could not verify a protocol-level audit list for Circle USYC from the provided web results alone. The available sources confirm that USYC has audited smart contracts and that the BSC USYC BEP20 token address is documented, but they do not provide a complete auditor/date/scope/findings/fix-status set for the Circle USYC deployments on Ethereum and BSC. The USYC docs state the Teller Smart Contract is audited, and the smart-contracts page lists the BSC USYC BEP20 token address; however, neither source includes audit severity counts or a bytecode-match confirmation for the deployed contracts.

Circle’s USYC documentation states the token contract is audited and verified on Etherscan, but the publicly accessible search results did not identify a named smart-contract audit firm or a report covering the deployed USYC code on Ethereum or BSC. The only clearly verifiable audit-related materials found were Circle’s own transparency pages and a third-party security/risk page that references an independent audit from Cohen and Company for reserves, which is not a smart-contract audit and is not enough to confirm deployed-code coverage.

Corrected audit record: a May 2, 2024 Hashnote/USYC Arbitrum application states that USYC was last audited in March 2024 and that audit information was sent separately, but it does not identify the auditor or publish the report. No publicly accessible report with enumerated findings was located as of September 6, 2026. The application separately identifies Cohen & Co International as the fund’s annual financial auditor; this is not evidence of a smart-contract audit.

Circle documentation claims the token contract is audited and Etherscan-verified, while CertiK records no third-party audit and the Etherscan page states that no contract security audit was submitted. This contradiction remains unresolved. Deployed-code/bytecode matching for the Ethereum and BSC contracts is not verifiable as of September 6, 2026.

Circle USYC is not a founder‑driven DeFi startup; it is a tokenized money‑market fund product operated by Circle via regulated offshore entities, with the token representing shares of the Hashnote International Short Duration Yield Fund Ltd. ### Issuer, corporate stack & jurisdiction

• Token administrator / issuer: Circle International Bermuda Limited (CIBL), a Circle group entity regulated as a digital asset business by the Bermuda Monetary Authority (BMA).
• Underlying fund: Hashnote International Short Duration Yield Fund Ltd., a Cayman Islands registered mutual fund licensed/overseen by the Cayman Islands Monetary Authority (CIMA).
• Business model: USYC is a tokenized share of a short‑duration U.S. Treasury / reverse‑repo fund; yield is delivered via token price appreciation, not dividends, positioning it as a regulated RWA/money‑market product rather than a typical DeFi yield farm. ### Founders & team reality check
• Corporate parent: USYC is branded and operated under Circle, a large, well‑known fintech company (also issuer of USDC). Circle publicly discloses its executive team and board on its corporate site, and is subject to multiple regulatory regimes due to USDC and other products.
• Founders of USYC itself: Public materials describe USYC as originally built by Hashnote and later acquired by Circle in January 2025; individual founders of Hashnote or a dedicated USYC founding team are not highlighted in product‑level documentation, and cannot be reliably established from the available data. *Not verifiable as of 2026‑09‑04.*
• Public vs. anon: Circle’s leadership and compliance teams are fully public corporate officers; there is no evidence USYC is run by anonymous developers. ### Onshore vs. offshore; office vs. web front
• Offshore structure: USYC is clearly structured as an offshore product for non‑US institutions, with a Bermuda token administrator and Cayman mutual fund, explicitly restricted to eligible non‑US institutional investors and allow‑listed wallets.
• Real business vs. pure web front: Circle maintains physical offices and a broad regulated business footprint (USDC, payments, trading services). USYC is presented as one product in that stack, integrated with major venues like Binance for off‑exchange collateral and institutional DeFi integrations. This strongly indicates a real, ongoing corporate operation, not a thin DeFi front. ### Track record, prior projects, incidents
• Prior projects: Circle’s history with USDC and other regulated asset products is well documented; USYC extends that RWA/treasury‑backed model into yield‑bearing collateral.
• Hacks / incidents: No hacks or smart‑contract exploits specific to USYC are reported in the reviewed materials. *Not verifiable as of 2026‑09‑04* for a complete incident history without direct on‑chain querying. Overall, USYC is best characterized as a regulated institutional RWA product from Circle using an offshore fund structure, not a founder‑centric DeFi protocol with anonymous devs or purely onchain governance.

Circle’s USYC currently has a relatively strong institutional reputation, anchored in Circle’s broader regulatory profile and the fund’s regulated structure, with no public evidence of fraud, rug pulls, or insolvency allegations as of 2026-09-04. Founders / sponsors / structure

• USYC is issued by Circle International Bermuda Limited, part of the Circle group (USDC issuer), and represents shares in Hashnote International Short Duration Yield Fund Ltd., a Cayman Islands mutual fund.
• Hashnote was acquired and integrated under Circle’s Bermuda license regime, indicating deliberate regulatory positioning rather than a standalone, opaque DeFi project. Regulators and compliance posture
• Circle International Bermuda Limited is described as licensed under the Bermuda Monetary Authority (BMA), while the underlying fund is licensed by the Cayman Islands Monetary Authority (CIMA).
• Access to USYC is permissioned, with onboarding that includes KYC/AML and restrictions to non‑U.S. persons in line with U.S. securities law.
• Smart contracts embed compliance logic (e.g., wallet allow‑listing), reinforcing a regulated‑access design even on BNB Chain and Ethereum. Auditors / formal assurance
• Public web data references USYC as a regulated mutual fund product but do not clearly state the name of the external auditor or provide audit reports directly. Not verifiable as of 2026‑09‑04. Sentiment & market perception
• Coverage by exchanges and platforms frames USYC as a tokenized money market fund offering short‑duration U.S. government‑linked yield via price appreciation, distinct from a $1‑pegged stablecoin.
• Media and ecosystem write‑ups (e.g., about launch on BNB Chain) are generally positive, emphasizing institutional‑grade collateral, composability in DeFi, and Circle’s compliance‑first approach. Criticisms / risk concerns
• Key concerns highlighted by third‑party explanations include:
• Regulatory and access risk: permissioned, non‑U.S. access and reliance on ongoing BMA/CIMA frameworks may limit composability and introduce jurisdictional risk.
• Smart‑contract and operational reliance on Circle/Hashnote: centralized administration and allow‑listing mean protocol and counterparty risk is non‑trivial, even if assets are government‑linked.
• No credible reports of sanctions actions, fraud, rug pulls, or insolvency proceedings specific to USYC were found. Not verifiable as of 2026‑09‑04 beyond available media and Circle disclosures. Unresolved information gaps
• Detailed information on auditor identity, frequency of fund audits, and any historical regulatory examinations or enforcement related specifically to USYC is not verifiable as of 2026‑09‑04 based on accessible public data.

Economic model (as of September 6, 2026). USYC is a permissioned tokenized share of Hashnote International Short Duration Yield Fund, not a conventional DeFi lending pool. Subscriptions use USDC; proceeds are invested primarily in short-term U.S. Treasury bills and repo/reverse-repo transactions backed by government securities.

Yield is embedded in a rising token/NAV price, with no staking or emissions. This is economically organic yield, but no verified percentage split between organic and subsidized yield is disclosed. Risk/strategy. Low-duration and cash-like, but not strictly market-neutral: investors retain Treasury-price/interest-rate, repo-counterparty, prime-broker, custody, operational and regulatory exposure. No evidence of protocol leverage, looping, restaking, or recursive DeFi borrowing in the underlying strategy; external exposure is to traditional-market intermediaries and government-securities markets.

Leverage ratio: unknown. Access and liquidity. Minimum investment is $100,000 and onboarding requires KYC/AML plus wallet allowlisting. Subscriptions and redemptions are available through the Teller 24/7/365. Below the instant-redemption capacity, settlement is generally one block; larger redemptions are T+0/T+1, subject to available liquidity.

Private Liquidity Teller arrangements can provide up to 100% instant liquidity for additional fees. The allowlist/entitlements contract can freeze transfers. No fixed lock-up is disclosed. Fees and revenue. Listed fees: 0.04% subscription, 0.03% redemption, and 10% of yield as a performance fee; first $1 million of combined daily subscription/redemption volume is automatically fee-waived for eligible investors on Ethereum and Solana.

After-hours pricing and private-liquidity fees may vary. Protocol revenue attributable specifically to USYC is not separately verifiable; DeFiLlama classifies USYC returns as backing-asset yield rather than on-chain fee revenue. TVL/APY. DeFiLlama currently shows approximately $2.58B in the main USYC pool and $41.89M in a second tracked pool, with APY around 3.08%–3.19% and “stable” 30-day behavior. Its chain pages report approximately $2.58B on BSC and $103.72M on Ethereum, creating an internal cross-page discrepancy that should be treated as an analytics-data inconsistency.

Dune comparison, exact historical TVL trend, APY time series/volatility, and chain-level reconciliation are Not verifiable as of September 6, 2026 because Dune MCP is unavailable. Structured fields: organic_yield_pct: null; leverage_ratio: null

As of September 6, 2026.

• Liquid reserves / treasury size: null. Circle’s USYC page currently displays $312,976,695.16 AUM, while Circle reported approximately $1.6 billion AUM on January 27, 2026 and its 2025 annual report reports $1.537818 billion of SDYF assets as of December 31, 2025. These figures materially conflict; no current independently reconciled reserve figure is available.
• Composition / reserve policy: The underlying Hashnote International Short Duration Yield Fund Ltd. invests primarily in short-term U.S. Treasury securities and repo/reverse-repo transactions backed by U.S. government securities. USYC represents fund shares, not a direct claim on a segregated on-chain wallet.
• Custody: Disclosed fund structure identifies BNY Mellon as custodian, with Marex Capital Markets as prime broker; fund assets are described as bankruptcy-remote from the manager. This is based on governance/secondary disclosures, not a current custodian statement.
• Control / administration: Hashnote Management LLC manages the fund; Circle International Bermuda Limited (CIBL), regulated by the Bermuda Monetary Authority, is token administrator. The fund is Cayman-domiciled and CIMA-registered. Circle acquired Hashnote in January 2025.
• Attestations / audits: Annual fund audits by Cohen & Co International (Cayman) are reported, but public reserve-attestation reports were not located. Not verifiable as of September 6, 2026 whether a current public attestation exists.
• On-chain balances via Dune: Not verifiable as of September 6, 2026; Dune MCP was unavailable. No chain-level exposure percentages or supply-to-assets reconciliation were performed.
• Contract addresses: Ethereum: 0x136471a34f6ef19fe571effc1ca711fdb8e49f2b. Official documentation currently lists BSC: 0x8D0fA28f221eB5735BC71d3a0Da67EE5bC821311; the previously recorded BscScan address 0x812a8b10329471b0ee5fff18909e76a0a2d5c89d remains an unresolved address discrepancy. Contradiction: Reported AUM ranges from $312.98 million to $1.6 billion, and the BSC contract address differs across records. On-chain reconciliation is unavailable.

USYC is not a governance/native protocol token. It is a permissioned, yield-bearing ERC-20/BEP-20 representing shares in Hashnote International Short Duration Yield Fund; yield is delivered through a rising token price/NAV, not emissions. Ticker/name: USYC / US Yield Coin. Contracts: Ethereum 0x136471a34f6ef19fE571EFFC1CA711fdb8E49f2b; BSC 0x8D0fA28f221eB5735BC71d3a0Da67EE5bC821311.

Supply, valuation and chain split. Latest accessible DeFiLlama token data reports 2.446bn circulating USYC, ~$2.778bn market cap and ~$2.778bn FDV. Its separate stablecoin page reports 2.366bn and ~$2.688bn, a material internal contradiction; no independently verified fixed maximum supply is disclosed. Chain balances on that page are BSC 2.329bn (~98.4%) and Ethereum 36.85m (~1.6%). Contradiction: aggregator snapshots disagree; on-chain verification is unavailable in this run.

Utility/economics. Utility is collateral, treasury/cash management and redemption into USDC for eligible non-U.S. investors. Circle lists 0.04% subscription, 0.03% redemption and a 10% performance fee on yield; fees are not distributed to tokenholders. No governance rights, revenue share, buyback, staking reward or burn program is documented.

Emissions/unlocks/allocations. There is no public team/investor/community allocation, vesting or unlock schedule: USYC is minted/redeemed against fund subscriptions/redemptions rather than emitted to stakeholders. Whether announced supply changes occurred on-chain: Not verifiable as of September 4, 2026. Insider-wallet attribution and consolidated top-holder concentration across both chains: Not verifiable as of September 4, 2026. Admin/control risk. Transfers are permissioned through an Entitlements/whitelist system; Circle documentation states wallets must be whitelisted.

Exact current controllers of mint, burn, blacklist, pause and upgrade roles, and any fee switch, are Not verifiable as of September 4, 2026. No reliable public DEX-depth snapshot or confirmed major DEX listing set was found: Not verifiable as of September 4, 2026.

For Circle USYC, a Bitcoin drop below $10,000 is a *macro-crypto stress* input, not a direct protocol trigger: the main expected effect would be wider crypto market deleveraging and a potential rise in redemptions or collateral haircuts if market participants lose risk appetite, but USYC is described as a token whose price tracks the fund NAV rather than Bitcoin. In the available sources, I could not verify USYC-specific on-chain exposure, collateral rules, or chain-level liquidity impact for BSC and Ethereum; Not verifiable as of 2026-09-04. The broader literature shows that stablecoin-like assets and safe-haven flows react to crypto shocks and that negative shocks can cause “runs” toward safer assets, while depegs and liquidity stress can amplify outflows.

Practically, under a Bitcoin sub-$10k scenario, the most relevant stress channels for USYC would be:

• Secondary-market discount / premium widening if demand for crypto collateral weakens.
• Redemption and liquidity pressure if holders rotate into cash-like assets during a broader deleveraging event.
• Collateral valuation friction if venues using USYC as collateral mark down all crypto-exposed assets more aggressively during crisis conditions. I could not confirm any protocol statement that quantifies USYC losses, reserve impairment, or TVL change under a $10k Bitcoin scenario. Not verifiable as of 2026-09-04.

For a 20% depeg of the largest collateral asset, the protocol-level impact on Circle USYC is not verifiable as of 2026-09-04 from the available sources. The retrieved material confirms that USYC is a NAV-priced tokenized money market fund share backed by short-term U.S. Treasury bills and reverse repos, and that DeFi users may treat it as collateral, but it does not provide a verified collateral inventory, chain-by-chain TVL, or a stress model for a 20% collateral depeg scenario.

What can be stated is that USYC is not a fixed-$1 stablecoin; its value is designed to track fund NAV and accrete yield, so a “depeg” in the collateral sense is conceptually different from a stablecoin peg break. The available commentary also warns that risk is concentrated in downstream collateral usage and oracle/redemption assumptions, not necessarily in the underlying Treasury portfolio itself. Because on-chain verification is unavailable in this run, the following are not verifiable as of 2026-09-04:

• the largest collateral asset used by Circle USYC on Ethereum or BSC;
• the percentage of exposure by chain;
• the loss transmission from a 20% collateral depeg into TVL, liquidation risk, or insolvency risk;
• whether any published stress tests or reserves data exist for this exact scenario. If you want a conservative institutional framing: the relevant risk is that a 20% drop in the largest posted collateral could force margin shortfalls, liquidations, or haircut expansion in venues accepting USYC as collateral, but the magnitude cannot be quantified from the provided evidence.

Circle USYC is an on-chain fund share backed by short-term U.S. Treasuries and cash-like instruments held in a bankruptcy-remote structure, with Circle acting as distributor/issuer of the tokenized share of the off‑chain fund. On-chain positions are claims on the fund, not on underlying counterparties. Baseline structure (high level)

• On-chain layer: USYC tokens on Ethereum and BSC, controlled via issuer/transfer‑agent smart contracts with whitelist/KYC and transfer controls.
• Off-chain layer: The fund holds Treasury bills, repos, deposits or cash at banks/brokers/custodians, and is subject to U.S. securities/fund regulation. Because Dune/on-chain data is not available in this run: Not verifiable as of 2026-09-04 for any TVL, holder concentration, or chain-level exposure breakdown. Below is a conceptual stress scenario for top counterparty insolvency consistent with this structure; concrete allocations to specific banks/brokers are not disclosed in public sources and thus Not verifiable as of 2026-09-04. --- ### Scenario: Top repo/bank counterparty defaults Trigger
• Largest repo counterparty or deposit bank for the fund becomes insolvent (e.g., major prime broker or bank holding cash/repo collateral). Expected loss path (economic) 1) Asset side hit:
• If exposure is via secured repo backed by Treasuries, the fund typically can seize collateral; loss severity depends on legal enforceability, haircuts, and market gap risk.
• If exposure is unsecured or excess cash at the failed bank, recovery depends on resolution (FDIC/insolvency), with possible haircut and time delay. 2) NAV impact:
• Any unrecovered portion reduces the fund’s NAV per share, so each USYC share economically entitles to less underlying. 3) Who absorbs loss?
• The fund investors (USYC holders) absorb the loss pro rata via lower NAV; no public commitment of Circle to absorb investment losses beyond legal/operational obligations.
• No external deposit insurance on Treasuries; limited deposit insurance may apply only to specific bank cash balances, not to the fund as a whole. On-chain / smart contract impact path
• USYC smart contracts remain fully backed by the off‑chain fund records; there is no automatic on-chain default event.
• Effects materialize via off-chain actions:
• Circle/fund administrator updates NAV and may pause or gate redemptions if permitted under fund docs in severe stress (e.g., to avoid run or to process orderly liquidation).
• Primary issuance/redemption via smart contracts may be temporarily frozen or restricted to reflect off-chain suspension, using admin/pausable roles. Compensation / recovery
• Recovery (if any) flows from insolvency proceedings of the failed counterparty into the fund, then indirectly to USYC holders via NAV uplift.
• No evidence of a standing insurance or guarantee fund specifically covering counterparty default losses for USYC; any such claim would be an unverified marketing claim unless disclosed in legal docs (Not verifiable as of 2026-09-04). Chain-specific note
• Ethereum vs BSC: The insolvency path is identical economically; smart contracts on each chain are just different token representations of the same off-chain fund interest. Any gating/pausing decision is expected to be applied uniformly across chains through issuer admin controls.

For Circle USYC, a stress scenario of committed fraud by the DAO or owners is not verifiable as of 2026-09-04 from the available sources. The product documentation shows USYC is a Circle product with smart-contract infrastructure and transfer restrictions/allowlist controls, but the provided sources do not establish a DAO control structure or any proven owner-fraud event for USYC. What *is* supportable is that USYC has issuer-controlled redemption and transfer discretion, so the relevant fraud/abuse risk is *centralized issuer or operator misconduct*, not a clearly evidenced DAO governance attack.

The most concrete evidence in the search results is a third-party risk write-up describing possible forced redemption and discretionary controls, but that source is not independent proof of fraud. Because there is no verified incident showing Circle, its owners, or a DAO committed fraud against USYC holders in the supplied results, the conservative institutional treatment is:

• Primary risk: issuer misuse of administrative rights, forced redemption, or improper allowlist actions
• Evidence of actual fraud: Not verifiable as of 2026-09-04
• DAO-specific fraud: Not applicable / not verifiable as of 2026-09-04 If you need a judgment for risk scoring, the appropriate label is low on DAO-fraud risk, medium on centralized-issuer abuse risk based on the documented control features, not on any confirmed fraud case.

USYC’s primary yield source is not negative over the last 30 days based on the available web data: DeFiLlama shows 30d fees of $741,243 for Circle USYC, and RWA.xyz shows 30D APY of 3.19%, both indicating positive yield generation rather than a negative carry outcome. USYC is described by Circle and independent explainers as a tokenized money market fund backed by short-term U.S. Treasuries and reverse repos, with yield accruing through NAV appreciation.

Because on-chain verification is unavailable in this run, the exact chain-level yield composition for BSC versus Ethereum is Not verifiable as of 2026-09-04. The most defensible stress-scenario conclusion is that a negative 30d primary yield source is not evidenced by the cited sources; if yield were negative, the current public analytics would need to show a corresponding contraction, which they do not.

Assessment — as of September 13, 2026. USYC is company/fund-administered, not DAO-governed. Circle International Bermuda Limited (CIBL), a Bermuda-licensed entity, issues/administers USYC; Circle acquired 100% of Hashnote Holdings LLC in January 2025, whose affiliates manage the Cayman fund SDYF and issue USYC. Control surface. Circle/Hashnote control the frontend, onboarding, minting/redemption workflow, allowlist/entitlements, oracle operations, and fund administration. Holding and transferring USYC requires KYC/AML onboarding and wallet permissions.

The Entitlements contract can freeze all USYC transactions, creating a unilateral operational halt. Contract documentation identifies Ethereum and BSC token, teller, oracle, and entitlements contracts, but does not document a DAO, proposal system, timelock, or public multisig governance. DAO / voting. No token-holder governance mechanism or proposal process was identified; DAO governance is therefore false, not merely symbolic. Voting concentration and top holders via Dune: Not verifiable as of September 13, 2026 (Dune unavailable in this run; no substitute on-chain inference made). Funds and emergency powers. The operational model routes subscription funds through Hashnote/its fund administrator into prime-broker investments; the documented system-halt power is centralized.

Whether an administrator key or role can arbitrarily transfer user assets, and whether any emergency bypass exists, is Not verifiable as of September 13, 2026 without direct contract-role/on-chain verification. Company details. CIBL is incorporated in Bermuda; the SEC identifies it as a Bermuda exempted company incorporated in 2019, and Circle lists BMA DAB License No. 54786. LEI: 254900HOS8Z6JFRRCO30.

A current Bermuda registration number, current directors, and USYC-specific Terms of Service are Not verifiable as of September 13, 2026. A 2021 SEC Form D historically listed Jeremy Allaire and Flavia Naves as directors, but this is not current evidence.

Assessment (as of September 4, 2026): USYC is not a permissionless DeFi protocol. It is a permissioned tokenized interest in Hashnote International Short Duration Yield Fund Ltd. (SDYF), a Cayman Islands mutual fund.

Circle International Bermuda Limited (CIBL) issues/administers the token under a Bermuda Monetary Authority Digital Asset Business Act licence; SDYF is regulated by CIMA. Circle acquired Hashnote in January 2025. Classification and restrictions: Circle’s SEC disclosures expressly characterize yield-bearing USYC as a U.S.-law security/TMMF and state it is offered under a Securities Act exemption, not as an unregistered U.S. public offering.

USYC and fund shares are restricted to non-U.S. persons; institutional onboarding and wallet allowlisting are required. KYC/AML, identity verification, sanctions screening and enhanced due diligence apply. Transfers may be frozen or halted for suspicious activity.

Terms/data protection: Applicable Circle terms, acceptable-use restrictions and privacy notices prohibit unlawful activity and restricted/sanctioned users. Circle states that personal data may include identity, financial, transaction, technical and location data, with processing under applicable Bermuda PIPA, Cayman Islands data-protection law, GDPR/UK GDPR and other laws; cross-border transfers and law-enforcement disclosures are contemplated. Warnings / actual risk: Regulatory licensing does not equal deposit insurance, principal guarantee, or U.S. securities registration.

Key residual risks are offshore fund/issuer structure, exemption and non-U.S.-investor dependence, centralized blacklist/freeze authority, redemption/liquidity limits, custody/prime-broker exposure, and legal-entity separation between Circle, CIBL, SDYF and Hashnote Management LLC. The legal wrapper is materially more centralized and regulated than the “DeFi” label implies. Enforcement, sanctions and litigation: No protocol- or USYC-specific regulator enforcement action was identified in the reviewed sources. Not verifiable as of September 4, 2026 whether undisclosed investigations exist. Circle entities have unrelated civil litigation, including the FT Partners fee dispute; it is not a USYC enforcement case.

No OFAC designation of CIBL, SDYF or Hashnote was located in the reviewed sources.

Legal entity per GLEIF: Circle International Bermuda Limited (LEI 254900HOS8Z6JFRRCO30; jurisdiction BM; registration ACTIVE). OFAC SDN screening of 'Circle International Bermuda Limited', 'Hashnote Management LLC', 'Circle USYC': no match. SEC litigation and administrative release feeds: no mention.

Circle USYC is not the protocol’s own stablecoin; it is a tokenized money market fund/share issued by Circle/Hashnote, so own_stablecoin = false. On the available web data, no depeg below $1.00 could be verified; the recorded price range is above peg, with CoinGecko showing an all-time low of $1.03 and an all-time high of $1.14, so the conservative answer is stable = true, depeg_count = 0, max_depeg_pct = 0, and last_depeg_date = null. If a stricter definition of depeg or direct on-chain verification is required, it is Not verifiable as of 2026-09-06.

USYC is a permissioned tokenized share of a Cayman Islands mutual fund, issued by Circle International Bermuda and backed primarily by short-term U.S. government securities and reverse repos. The principal residual risks are legal/regulatory dependence, liquidity and counterparty concentration, and additional blockchain/oracle/USDC dependencies; on-chain verification was not performed — Not verifiable as of September 5, 2026.

Circle USYC’s top strengths are: yield-bearing collateral backed by a tokenized money market fund; 24/7 near-instant redemption into USDC; onchain transparency with token price and holdings published for verification; composability as a standard ERC-20 / onchain asset that integrates with DeFi; and institutional utility for programmable settlement, margin, and cross-margin use cases. Circle also states USYC is available on Ethereum and BNB Chain, which broadens access and liquidity across ecosystems. The strongest user-facing advantage is that USYC turns money-market exposure into a blockchain-native asset: yield accrues through token price appreciation rather than separate reward claims, and redemptions settle atomically in real time against USDC.

Circle also emphasizes that the fund is transparent and auditable, with holdings and pricing exposed through an onchain oracle, which improves monitoring compared with opaque offchain fund structures. For institutional workflows, Circle positions USYC as programmable collateral for automated fund flows, settlement, and margin efficiency across supported venues. A practical strength is multi-chain reach.

Circle says USYC is available on Ethereum and BNB Chain, and its BNB Chain launch note highlights near-instant settlement and deep DeFi liquidity as part of the protocol’s utility.