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Tokenized real-world assets

Theo Short Duration US Treasury Fund (thBILL)

Rejected The evidence weighs against it
Issued
2026-09-23
Last confirmed
2026-09-23
Next check due
2026-12-23
Research basis
Individual research
Chains
Ethereum · No freeze key, Arbitrum One · Mixed control, Base · Mixed control, Hyperliquid / HyperEVM · Issuer can freeze
Symbols
thBILL
Eligibility file
What the holder owns and who may hold it

thBILL is a token Theo sells as on-chain access to ULTRA, a Singapore unit trust that holds ultra-short US Treasuries, repos, and cash. FundBridge Capital manages the trust, Wellington Management picks the bonds, Standard Chartered holds them, and Libeara, a Standard Chartered venture, tokenizes the units. Theo’s page now also names FILQ, Fidelity International’s tokenized liquidity fund, but the contract lists only ULTRA’s wrapper. Theo stands two wrappers away from the fund. Its tULTRA vault counts ULTRA units, and its thBILL vault holds tULTRA. On 2026-09-23 the Ethereum contract held 36.3 million thBILL, about $36.9 million at $1.0148. CoinGecko’s $118 million counts about 120 million tokens that the chain does not show. Theo’s own docs settle the question of the claim: “Participants have no claims over underlying assets.” A holder who passes KYC can redeem for USDC, and Theo names no legal issuer, no governing terms, and no record of holders. Its terms bar US citizens and residents. The chain adds a second problem. The tULTRA vault on Ethereum held no ULTRA units on 2026-09-23. All 35.7 million of its assets were booked as pending. Theo’s minting system writes that number and clears it when the fund delivers units, and only 797,543 ULTRA units exist on Ethereum at all. The assessment is adverse. The underlying fund has sound service providers, but a thBILL holder owns a token with no stated claim on it, backed on chain by a pending entry, from an issuer that does not name itself.

The research file

Two wrappers over one fund

Theo’s tULTRA page identifies the fund: the Delta Wellington Ultra Short Treasury On-Chain Fund, a Singapore unit trust regulated by the Monetary Authority of Singapore. FundBridge Capital is the fund manager, Wellington Management is the investment manager, Standard Chartered Bank is the custodian, and Libeara is the tokenization provider. tULTRA is an upgradeable ERC-4626 vault at 0x82b8…7330 whose asset is the ULTRA token. thBILL, at 0x5fa4…1da0b, is a second ERC-4626 vault that takes a list of deposit assets. That list contains one entry, tULTRA. Theo’s product page says thBILL also holds FILQ, sourced through Sygnum, but the list read on 2026-09-23 had no second entry. On 2026-09-23 thBILL held all 35,735,762 tULTRA in existence and valued them at 37,720,134 dollars. thBILL moves to Arbitrum, Base, and HyperEVM as a LayerZero token. The Ethereum adapter locks thBILL, and the other chains mint a copy. A Safe with a threshold of three owns each copy. It can change which contracts it accepts messages from, which determines what those chains will mint.

What is on chain behind the token

Theo’s tToken page explains “pending assets.” When a user mints, Theo’s MPC wallet sends USDC to the fund, tTokens are minted at once, and the expected fund units are booked in pendingAssets. When the issuer delivers the units, they move to the vault’s balance. On 2026-09-23 the tULTRA vault on Ethereum reported total assets of 35,735,762 and pending assets of the same figure, while its ULTRA balance was zero. The ULTRA token on Ethereum had 797,543 units outstanding. Five wallets held them, and none was Theo’s vault. The fund units behind thBILL may sit on another chain or on Libeara’s register. Theo does not say where. The chain shows a number written by a key Theo controls. Theo’s December 2025 release with Stable said thBILL had passed $200 million; its product page says “$175M+”; the contract says $36.9 million. Nothing public audits any of the three against the others.

What the holder owns, and who may hold

Theo’s docs say: “Participants have no claims over underlying assets. Upon redemption, the equivalent value of the redeemed thBILL is returned in USDC.” Its product page says the opposite in softer words, calling thBILL “your proportional share of the ULTRA fund’s Treasury holdings.” No offering document, issuer entity, or token terms are public. Theo’s terms cover only its app, and they bar “citizens or residents of the United States.” The docs say only KYC’d users may mint or redeem. The product page archived on 14 September promised “No minimums, no lockups, no paperwork.” The page read on 23 September no longer does, and no document states a minimum. The token has no allowlist, so anyone can buy it on a DEX. The claim model is recorded as not stated.

How money gets out

A KYC’d user redeems through Theo and receives USDC. Theo says the token side settles at once and the fund units settle within four business days. Theo therefore pays before the fund does and carries the gap. Everyone else sells on a DEX. The thBILL vault also has a public ERC-4626 withdraw that pays out tULTRA, but tULTRA has a whitelist, so only an approved wallet can take it. Nothing in Theo’s documents promises a redemption time, a gate, or what happens if the fund suspends.

Who controls the token

On Ethereum, thBILL’s admin role belongs to a timelock with a 48-hour delay. That role can upgrade the contract, change the deposit list and its ratios, and move out any token that is not a deposit asset. The emergency role can pause every transfer and belongs to 0x7afb…d94a, an address with no code: one private key. Theo’s docs describe the emergency signer for its tToken vaults as a 2-of-4 multisig. On thBILL it is not. thBILL cannot freeze one holder or take a balance. The tULTRA vault beneath it can. Its verified code has a seize function, a whitelist, and a transfer switch. The power to take value therefore sits one layer down, in a vault whose assets are a pending entry.

Comparison and decision

The 2026-08-14 memo applied the old size screen and did not read the contracts. The protocol is below the size floor, so an individual review is not opened until it clears that floor. Against the tokenized Treasury funds already filed here, where the token is the fund share and a named transfer agent keeps the record, thBILL offers the Treasury yield without the share: no stated claim, no named issuer, a pending entry where the units should be, and a single key that can stop transfers. The fund itself may be well run; nothing found says otherwise. The assessment is adverse. The file is excluded by policy because US persons may not hold it, and it is ineligible for model clients.

Sources

The claims above trace to these. Where a number could not be independently verified, the thesis says so.

Inherited controls

The research above describes the protocol layer. Every position also inherits the asset it holds and the chain it settles on. The layer with the most administrative power sets the position’s effective control; that describes control, not quality or suitability.

ChainVerdictControlControl constraint
EthereumApproved No freeze key No sequencer, no upgrade key, no operator who can be compelled. Rule changes require social consensus.
Arbitrum OneApproved with limits Mixed control a single sequencer orders >99% of transactions and admin keys can upgrade bridge contracts on a ~7-day timelock.
BaseApproved with limits Mixed control Coinbase, one regulated US company, operates the only sequencer, and admin keys can upgrade bridge contracts within ~7 days.
Hyperliquid / HyperEVMRejected Issuer can freeze a 21-validator permissioned set operates both the chain and its bridge. One compromise reaches both.
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