The most common question from treasury teams evaluating yield-bearing stablecoins is the simplest: what does this offer that direct T-bill ownership doesn't? The answer depends on the operational profile of the dollars, the chain those dollars need to live on, and the holder's tolerance for issuer and smart-contract risk. As of April 2026, the spread between direct 3-month T-bills (4.30%) and tokenized-Treasury stablecoins like USDM (5.00%) is positive in favor of the stablecoin — a reversal from 2023 when most yield-bearing tokens trailed T-bills by 50-80 bps.
This article puts the comparison side-by-side: rates, settlement timing, capital lockup, counterparty exposure, and the actual operational differences for a finance team running treasury, payroll, or marketplace settlement onchain. Money-market funds are included because they are the closest TradFi analog to T-bill-backed stablecoins like USDY and USDM.
What Are the Real Yields?
Headline APY before frictions:
Vehicle | APY (Apr 2026) | Yield engine | Distribution |
3-month T-bill (direct via TreasuryDirect) | 4.30% | Federal government debt | Discount, par at maturity |
3-month T-bill (broker, secondary market) | 4.28% | Same | Same minus broker fee |
Vanguard VMFXX (Federal Money Market Fund) | 4.55% | Treasury repos, T-bills | Daily dividend |
BlackRock TBIL (iShares 0-3 Month Treasury ETF) | 4.42% | Short-duration T-bills | Monthly dividend |
FDIC high-yield savings (top decile) | 4.50% | Bank lending | Monthly interest |
USDM (Mountain) | 5.00% | Short-duration T-bills + deposits | Daily rebase |
USDY (Ondo) | 4.65% | Short-duration T-bills + deposits | Price accrual |
BUIDL (BlackRock) | 4.55% | Short-duration T-bills | Monthly distribution |
USYC (Hashnote) | 4.85% | Short-duration T-bills | Price accrual |
sUSDS (Sky) | 4.75% | Onchain lending + RWA | Wrapper redemption |
Aave V3 USDC (Ethereum) | 4.10% | Variable lending demand | Live accrual |
Morpho curated USDC vault | 5.20% | Curated lending | Live accrual |
Three observations from the table. First, the yield-bearing-stablecoin tier (4.55% to 5.00%) sits above direct T-bills (4.30%) on net. Second, the spread is small — typically 25 to 70 bps. Third, only USDM and USYC clearly beat the highest-yielding TradFi alternative (VMFXX). The premium is operational, not yield-driven.
How Settlement and Capital Lockup Differ
The headline APY is part of the picture. Operational characteristics often matter more for treasury teams.
Settlement timing
Direct T-bills. T+1 from purchase to settlement; held to maturity (4 weeks to 26 weeks); accrual paid at maturity through par redemption. To exit early: secondary-market sale, T+1 settlement, possible discount.
Money-market funds. Same-day or T+1 redemption depending on the cutoff. Funds settle to the holder's brokerage cash account.
USDM, USDY, USYC. Onchain transfer settles in seconds. Primary redemption is T+1 to T+2. Secondary-market exit is instant subject to liquidity.
BUIDL. Onchain transfer settles in seconds. Primary redemption is T+1 with banking-day constraints.
sUSDS, Aave. Instant onchain redemption. No banking layer.
Capital lockup
T-bills. Held to maturity for full coupon. Early exit via secondary market.
Money-market funds. None.
Most yield-bearing stablecoins. None for secondary-market exit; primary redemption requires a $100K minimum and T+1 banking.
sUSDe. 7-day cooldown for primary unstaking.
Aave. None unless the pool is utilization-stressed.
Operational integration
This is where stablecoins differentiate. T-bills and money-market funds settle through brokerage rails; an onchain payment cannot route from them without unwinding through a custodian and a bank. Stablecoins settle on the same rails as the payment itself. A team paying suppliers in USDC across multiple chains can hold the working capital in USDM and never touch a bank.
Counterparty Risk Compared
Vehicle | Primary counterparty | Secondary counterparty | Bankruptcy isolation |
Direct T-bill | U.S. Treasury | Broker (custody) | Strong (segregated) |
Money-market fund | Fund custodian | Underlying issuers (Treasury, agency) | Strong (40 Act fund) |
USDM | Mountain Protocol | BNY Mellon, BitGo | Bermuda corp + custodial segregation |
USDY | Ondo USDY LLC | Morgan Stanley, BlackRock | Delaware bankruptcy-remote |
BUIDL | BlackRock USD Institutional Liquidity Fund | Same as fund | 40 Act fund |
sUSDS | Sky protocol contracts | RWA partners (Centrifuge, etc.) | Onchain protocol; no entity-level isolation |
Aave USDC | Aave V3 contracts | USDC issuer (Circle) | Onchain protocol; no entity isolation |
Direct T-bills and money-market funds carry the lowest counterparty risk by traditional measures (regulated, transparent, audited, Federal Reserve-mediated). Tokenized-Treasury stablecoins add an issuer layer (Mountain, Ondo, BlackRock) on top of the same Treasury exposure. Onchain-only options (sUSDS, Aave) substitute smart-contract risk for entity-level isolation.
The relevant question for a treasury team: is the issuer risk on Mountain or Ondo material relative to the operational benefit of onchain settlement? For a team already settling onchain, yes. For a team that converts back to fiat for every payment, the answer is much less obvious.
Yield-Adjusted for Frictions
The headline APY rarely matches the realized yield after frictions.
Frictions on direct T-bills
Brokerage fees: $0 for U.S. retail; 1-3 bps for institutional sweep accounts.
Cash drag during settlement: 1-2 days at 0% on funds in transit.
Time cost: most teams cannot manage a T-bill ladder in-house; outsourcing to a treasury manager costs 5-15 bps.
Frictions on money-market funds
Expense ratio: 9-25 bps (already netted out of the published APY).
Same-day cash availability adds T+0 settlement value.
Frictions on tokenized-Treasury stablecoins
Issuer fee: 25-75 bps (already netted out of published APY).
Gas fees on rebase or claim transactions (small for the holder, paid by the issuer for USDM rebases).
Slippage on secondary-market entry/exit: 5-15 bps under normal conditions.
Bridge costs if the token needs to live on a different chain than its primary deployment.
Frictions on Aave / Morpho deposits
Variable rate: the published APY is not contractual. A utilization swing can compress it by 100+ bps overnight.
Smart-contract risk premium: implicit, hard to quantify.
Gas: deposit + withdrawal on Ethereum can cost $5-50 round-trip; immaterial on L2s.
Net of frictions, the practical ranking for a treasury team holding $10M of dollar-denominated working capital that needs to settle some payments onchain is approximately:
USDM (5.00% net, U.S.-accessible, $1.00 peg) — best for U.S. teams settling onchain
USYC (4.85%, permissioned) — best for institutional teams already KYC'd through Hashnote
sUSDS (4.75%, fully permissionless, $1.00 USDS peg) — best for onchain-only flows without KYC
USDY (4.65%, non-U.S.) — best for cross-chain flows on Solana, Sui, or Mantle
VMFXX (4.55% net, fiat-only) — best for teams not settling onchain
Direct T-bills (4.30% gross) — best for buy-and-hold treasury without operational urgency
Source rates: Treasury yield curve, DeFiLlama yields aggregator.
When the Stablecoin Wins, When the T-Bill Wins
The stablecoin wins when
Working capital needs to settle on the same rails as the yield product (onchain, 24/7).
Cross-chain payments are routine; stablecoins live on every major chain, T-bills do not.
The team is small enough that a treasury management mandate is more expensive than the issuer fee.
The flow is small (under $1M); brokerage minimums and ladder management overhead make direct T-bills inefficient.
The T-bill wins when
The dollars do not need to settle onchain; flow is bank-to-bank.
Position sizes are large enough (above $50M) to justify a treasury management process.
Counterparty risk is the priority; direct Treasury claim is the cleanest possible exposure.
The horizon is long and the discount of holding to maturity does not impair operational flexibility.
The hybrid wins when
A core position lives in T-bills or money-market funds for size and counterparty cleanliness.
An operational layer (5-20% of total dollars) lives in USDM, USDY, or sUSDS to settle onchain payments.
The team accepts the spread between the layers as the cost of operational integration.
How a Real Treasury Team Splits Across Vehicles
The portfolios of teams that have actively migrated to onchain yield reveal a pattern. The split is rarely "all in" on either side. A representative allocation for a mid-sized team holding $25M of dollar-denominated working capital:
~50% in money-market funds or 1-3 month T-bill ladder. Covers the bulk of the position with the lowest counterparty surface and the fastest TradFi exit. Pays ~4.4% net.
~25% in USDM or sUSDS. Pays ~4.85% net. Provides the operational layer for any payments that need to settle onchain. Sized to roughly cover one quarter of expected onchain settlement volume.
~15% in plain USDC across operational chains. Pays ~4% net via Aave or a curated Morpho vault, with some held as zero-yield buffer. Used for same-day onchain settlement where conversion delay matters.
~10% in a higher-yield satellite. Pendle PT-sUSDe or sUSDe directly, or a curated lending-market vault. Pays ~7-9% net. Sized to absorb its own volatility without affecting operational liquidity.
The blended portfolio yield is approximately 5.0-5.3% net, with the satellite providing the carry uplift and the core providing stability and counterparty cleanliness.
What Changes with Stablecoin Legislation
The pending U.S. stablecoin legislation could materially shift the calculus. Two scenarios are worth thinking through.
Payment-stablecoin classification confirmed
If USDC and USDT are confirmed as payment stablecoins (cannot pay interest), and yield-bearing tokens are explicitly classified as securities, the holder universe for tokens like USDM and sUSDe narrows. Distribution becomes more restricted. Issuers register or geo-block. The spread between direct T-bills and tokenized-Treasury stablecoins could widen as the regulatory cost goes up.
Permissive yield framework
If the legislation explicitly carves out a yield-bearing-stablecoin category with disclosure rather than registration requirements, the path is open. More issuers enter. Spreads compress further. Tokenized money-market funds could replace traditional money-market funds for digitally-native treasury teams.
Both scenarios involve material changes for treasury teams. A team committing capital to yield-bearing stablecoins should track legislative progress and have a contingency plan for either outcome.
How Eco Routes Reduces the Operational Cost of Yield-Bearing Stablecoins
The biggest hidden cost of holding a yield-bearing stablecoin in production is the chain it lives on. USDM is on Ethereum, Polygon, Base. USDY is on Ethereum, Solana, Mantle, Sui, Aptos. sUSDS is Ethereum-only. A team holding any of these needs to settle payments on chains the token does not natively support, and manual unwinding through a bridge plus a swap eats into the operational benefit the yield was supposed to deliver.
Eco Routes is the stablecoin orchestration layer. A team holds yield-bearing stablecoins on the chains where the token lives most natively, submits intents to settle in any stablecoin on any of 15 supported chains, and Routes selects the best path: direct solver, redemption, swap, bridge, or a multi-leg combination. The team does not unwind manually. The yield-bearing position stays where it earns most. See stablecoin treasury APIs compared and stablecoin automation platforms for related context.
FAQ
Are tokenized Treasury stablecoins safer than holding T-bills directly?
No. Direct T-bills are the cleanest possible Treasury exposure. Tokenized variants add an issuer layer (Mountain, Ondo, BlackRock) on top of the same underlying. Issuer failure freezes redemption. The trade-off is operational, not safety: tokens settle onchain.
Why does USDM pay more than VMFXX?
Slightly different fee structures and slightly different reserve composition. USDM holds Treasuries plus bank deposits at multiple insured banks; VMFXX holds Treasuries plus repos. The 45 bps spread reflects Mountain's customer-facing fee structure compared to Vanguard's institutional-class share class.
Can I hold a tokenized T-bill in a brokerage account?
Some, not all. BUIDL is held through Securitize, which integrates with select brokerage platforms. USDY and USDM are held in self-custody wallets or through crypto-native custodians (Fireblocks, BitGo, Anchorage). Read the digital dollars explainer for the full custodial spectrum.
What's the spread between tokenized T-bills and direct T-bills?
As of April 2026, tokenized variants are paying ~25 to 70 bps above direct 3-month T-bills depending on the issuer's fee structure and reserve mix. The spread compressed from ~80-100 bps in 2023 as more issuers entered the market.
Are yield-bearing stablecoins regulated?
Most issuers are regulated in some jurisdiction (Mountain in Bermuda; Ondo's USDY through Delaware LLC structure; BUIDL as a 40 Act fund). The relevant U.S. legislation distinguishes payment stablecoins (cannot pay interest) from yield-bearing tokens (treated as securities). The pending stablecoin bill could materially shift the U.S. regulatory perimeter.
Should a treasury team hold yield-bearing stablecoins or T-bills?
Both. A common allocation: 70-90% in direct T-bills or money-market funds for size and counterparty cleanliness; 10-30% in yield-bearing stablecoins like USDM or sUSDS for onchain operational flow. The split is sized to the team's settlement velocity. See automation platforms for related strategies.