Tokenized T-Bill funds with daily NAV
Regulated funds hold short-duration Treasuries; the token is a fund share that accretes NAV instead of trading exactly at $1.
T-Bill / RWA fund tokens are the on-chain wrapper around a regulated short-duration government-securities fund. Subscriptions come in as USD or a permitted stablecoin; the fund deploys into U.S. T-Bills, overnight repos, and cash; the token represents a fund share whose net asset value (NAV) rises every day by roughly the prevailing risk-free rate. Most of these tokens are explicitly not pegged to $1.00 — they are NAV-accruing fund shares with a daily price published by the fund administrator.
Closer to a tokenized Treasury bond ETF than to a checking account. Yield is real, but redemptions run through a transfer agent (the fund's registrar of record), holdership is whitelisted, and secondary-market liquidity is thinner than in fiat-cash stablecoins.
How it works
The flow, step by step
Investor cash
A KYC-verified investor — typically a Qualified Purchaser (a U.S. accreditation tier above accredited investor that requires roughly $5M+ in investments) or an accredited investor — subscribes USD through a transfer agent such as Securitize or NAV Consulting. Some funds also accept tokenized USDC and convert inside the fund.
T-Bills + Repos
The fund deploys cash into short-duration U.S. T-Bills, overnight reverse-repos, and a small cash buffer. The administrator publishes a daily NAV; the on-chain token records the holder list and accretes yield.
USDX units
The token is minted or rebased pro-rata. BENJI rebases share count daily so per-token value stays near $1.00; BUIDL accrues by minting new units; USDY and OUSG appreciate by per-token price. Redemption is bank-wire or stablecoin-out, settled at NAV.
Where the design fails
Known failure modes
- Duration mismatch in a yield-curve shock
- Short-duration Treasury funds still carry mark-to-market risk. A sharp jump in short rates pushes T-Bill prices below par; the fund recovers at maturity, but redemption pricing during the shock is at the depressed NAV.
- Redemption gating and transfer restrictions
- These are securities, not cash. Transfers are restricted to whitelisted addresses; primary-market redemption can be paused, queued, or settled T+N. In a stressed market this matters more than the underlying asset risk.
- Custodian and fund-administrator failure
- The token is only as good as the off-chain legal claim. BNY Mellon custodies BUIDL; Anchorage Digital Bank — an OCC-chartered national bank — issues and holds USDtb's reserves. If the custodian is impaired, or the transfer agent fails, the on-chain token becomes a claim on a frozen legal structure.
- Bridge layer mismatch
- Several products keep the fund-share registry on a single chain and bridge token representations via LayerZero OFT or another third-party bridge. A bridge failure can suspend cross-chain transfers without affecting the underlying fund.
What to watch on Pharos
Signals that matter most
- 01
NAV-tag treatment on the peg table — `navToken: true` coins show "NAV" rather than bps in the peg-deviation column.
- 02
Reserve composition on `/stablecoin/[id]/` — these should be majority `very-low` risk (Treasuries, repos, cash). Anything else is unusual.
- 03
Redemption Backstop route family — most NAV tokens show `offchain-issuer` with bank-wire settlement; watch `settlementDelaySec`, `dailyLimitUsd`, `minRedeemUsd`, and `holderEligibility`.
- 04
Yield Score (PYS) on `/yield` — PYS rewards consistent Treasury-derived yield over reward-heavy or single-source-dependent venues.
- 05
`navToken` exclusion from DEWS — DEWS skips NAV tokens; the closest equivalent stress signal is the Redemption Backstop snapshot and issuer reserve cadence.
- 06
Proof-of-Reserves attestor tier and cadence on the detail page — `big4` with daily NAV is the gold standard for tokenized funds; `niche` is acceptable but slower to respond.
Tracked examples
Live coins using this design
- BUIDLBlackRock USD
BlackRock's institutional money-market fund issued under SEC Reg D. Majority short Treasuries with a repo and cash float. Custodied at BNY Mellon, administered by Securitize.
- BENJIFranklin OnChain U.S. Government Money Fund
On-chain share record for Franklin Templeton's FOBXX, an SEC-registered U.S. government money market fund. Stable $1.00 NAV; yield distributed by daily rebasing of share count.
- USDYOndo US Dollar Yield
NAV-appreciating dollar token backed by short Treasuries, iShares Short Treasury Bond ETF shares, and bank demand deposits. Permissioned for non-U.S. investors; bank-wire redemption at daily NAV.
- OUSGOndo OUSG
NAV-accreting share class for U.S. Qualified Purchasers. Reserves are mostly BUIDL with a smaller BlackRock FedFund and USDC liquidity float. Instant T+0 mint/redeem against USDC via OUSGInstantManager; whitelisted transfer only.
- USDTBEthena USDtb
Fiat-cash-style mint/redeem with reserves mostly in BUIDL plus a USDC float. Issued by Anchorage Digital Bank under OCC supervision. Designed as the calm reserve asset behind USDe.
Variations
Sub-flavors within the archetype
- Tokenized money-market funds with stable $1 NAV
- BENJI and similar share tokens operate as $1-stable funds where yield is paid out by rebasing share count. UX looks fiat-cash; the legal wrapper is a fund.
- NAV-accreting fund shares
- BUIDL, USDY, OUSG, and USYC let per-unit price drift up over time. Pharos flags these with `navToken` and shows "NAV" instead of bps on peg-deviation tables — price drift is signal, not depeg.
- Hybrid yield-bearing stablecoins
- USDtb (Ethena) and the M0-built family use T-Bill reserves to back a token that does target $1. The exit rail differs from a pure NAV token; the reserve mechanics are the same.
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