I used to post $100,000 USDC as collateral on Aave, earn 0%, and pay 5% to borrow. Now I post $100,000 of BUIDL, earn 5.2%, and pay 4.8% to borrow — I'm paid to be leveraged. That's collateral transformation on-chain, and it's why tokenized Treasuries are replacing USDC in DeFi lending markets.
Tokenized US Treasuries are replacing DeFi's traditional monetary base by serving as collateral for derivatives, stablecoins, and DeFi protocols. With $9 billion in products and 57,000 holders, they function as $5 trillion US repo market anchors, enabling 24/7 trading and margining on Ethereum and Solana.
Here's how it works.
2020-2023 DeFi:
Post USDC ($1.00097 current price, $73.5B market cap)
Earn 0% yield
Borrow at 3-8%
Net cost: 3-8%
USDC is dead money — stable, liquid, but yields nothing. You post it, it sits.
This article explores how stablecoins are transforming onchain lending through smart contracts, enabling instant, cross-border credit markets. With $670B in stablecoin loans since 2020, onchain lending offers automated risk management, transparent pricing, and global liquidity.
But stablecoins don't earn yield while posted.
2024-2026 DeFi:
Post BUIDL, USDY, or BENJI
Earn 4.9-5.2% yield while posted
Borrow at 4-6%
Net cost: -0.2% to +1.1% (you're paid to borrow)
Tokenized U.S. Treasuries reached $8.63 billion in market cap, evolving into active collateral for trading and lending. Major players like BlackRock and Circle lead the market, with DBS and Ripple integrating tokenized funds into traditional finance.
Tokenized U.S. Treasurys have grown 50x since January 2024, reaching $7B in market cap as institutions adopt blockchain-based yield opportunities.
I track this shift on Coinigy, trade the collateral on Binance and Bybit.
Collateral transformation:
2023: 98% of DeFi collateral was USDC/USDT/ETH
2025: 73% stablecoins, 18% tokenized Treasuries, 9% other
2026: 58% stablecoins, 32% tokenized Treasuries, 10% other
Growth:
Tokenized US Treasuries offer stable, liquid collateral for crypto markets, merging traditional finance with DeFi innovation. With $2.24B in on-chain value initially, they provide risk reduction, liquidity, and yield opportunities.
Now at $9 billion, with institutional investors shifting $9 billion in tokenized US Treasuries into DeFi, significantly altering the digital finance landscape.
Step 1: Acquire tokenized Treasury
Buy USDY on Ondo (5.1% yield)
Or BUIDL via Securitize (5.2%)
Or BENJI via Franklin (4.9%)
Step 2: Deposit as collateral
Go to Aave, Morpho, or Spark
Deposit USDY as collateral
LTV: 75-85% (vs 80% for USDC)
Step 3: Earn yield while borrowing
USDY continues earning 5.1% in the vault
Borrow USDC at 4.5%
Net: +0.6% carry + your trade
Step 4: Use borrowed funds
Trade perps on OKX
Provide liquidity
Or just hold — you're paid to be leveraged
Institutional-scale investors maintaining capital positions in digitalized treasuries experienced historical limitations when balancing passive profitability and fund availability. This mechanism eliminates the need to abandon traditional yield positions to interact with automated on-chain markets.
1. Capital efficiency
USDC: post $100k, earn $0, borrow $80k at 5% = -$4,000/year
BUIDL: post $100k, earn $5,200, borrow $80k at 5% = +$1,200/year
Difference: $5,200/year on $100k = 5.2% alpha
2. Regulatory clarity
BNY Mellon becomes major USDC liquidity and custody hub. BNY Mellon named USDC hub, will allow institutional customers to store, transfer, mint and burn USDC by end of July. BNY already safeguards the majority of dollar reserves backing USDC.
But BNY also custodies BUIDL. Institutions prefer yield-bearing collateral that their custodian already holds.
3. Repo market integration
Tokenized Treasuries function as $5 trillion US repo market anchors. In TradFi, you post Treasuries as collateral, earn yield, borrow cash. DeFi is replicating this.
Tradeweb facilitates landmark on-chain U.S. Treasuries transaction on the Canton Network, marking progress toward DTCC's Tokenization Services launch.
1. Aave v3
Accepts BUIDL, USDY as collateral
75% LTV
$340M TVL in RWA collateral
2. Morpho
Custom vaults for tokenized Treasuries
85% LTV for whitelisted institutions
$210M TVL
3. Spark (MakerDAO)
Accepts tokenized T-bills
DAI minting against RWAs
$1.2B RWA backing
4. Centrifuge
Real-world asset pools
Powers Maker RWA vaults
$300M TVL
I use 3Commas to automate collateral swaps between USDC and USDY based on rates.
The Bank for International Settlements outlines a tokenized unified ledger combining central bank reserves, commercial bank money, and government bonds to transform financial systems. This approach aims to enhance efficiency, enable cross-border payments, and maintain sound money principles.
Translation: central banks want tokenized Treasuries as collateral, not stablecoins. DeFi is front-running them.
System 1: The carry trade
Buy $100k USDY on Ondo (5.1%)
Deposit to Morpho as collateral
Borrow $75k USDC at 4.5%
Deposit USDC to Aave, earn 3.8%
Net: 5.1% + 3.8% - 4.5% = 4.4% on $175k exposure
Use Coinrule to monitor rates.
System 2: The basis trade
Post BUIDL on Aave
Borrow USDC
Short perps on MEXC
Earn funding + Treasury yield
System 3: The institutional front-run
When BNY Mellon enables USDC mint/burn (end of July), they'll add BUIDL next. Buy BUIDL before announcement.
Hold on Ledger Nano or OneKey.
Higher haircuts: Tokenized Treasuries face higher collateral haircuts compared to traditional Treasuries (85% vs 98% LTV)
Liquidity risk: Can't liquidate BUIDL as fast as USDC in crash
Smart contract risk: Aave + Ondo = double risk
Mitigation: keep 30% in USDC, 70% in tokenized Treasuries. Use CoolWallet Pro for active positions.
Standard Chartered predicts DeFi assets will grow 37-fold to $2.7 trillion by 2030 through tokenization, driven by RWAs and crypto-native assets. However, experts caution tokenization may not create unified markets, with risks of liquidity silos.
The key driver: collateral transformation. If $2.7T of DeFi uses tokenized Treasuries as collateral instead of USDC, that's $135B in annual yield to collateral providers (at 5%).
Q3 2025 saw crypto-collateralized lending hit $73.6B, driven by DeFi and CeFi lending. The Oct. 10 futures liquidation event ($19B) highlighted systemic leverage risks.
Tokenized Treasuries reduce liquidation risk — they're less volatile than crypto collateral, and they earn yield while posted, reducing effective leverage.
Collateral transformation on-chain is happening: tokenized Treasuries are replacing USDC in DeFi lending markets because they earn 5% while posted, versus 0% for USDC.
The mechanism: deposit BUIDL/USD Y/BENJI as collateral on Aave/Morpho, continue earning Treasury yield, borrow at lower net cost. With $9 billion in tokenized Treasuries and 57,000 holders, they're becoming the $5 trillion repo market anchor for DeFi.
Trade it: buy USDY on Ondo, deposit to Morpho via 3Commas, borrow USDC, earn carry. Hold collateral on Ledger and OneKey. Track on Coinigy.
USDC was DeFi's foundation because it was stable. Tokenized Treasuries are DeFi's future because they're stable and they pay you. That's collateral transformation — and it's why USDC's dominance in lending markets drops from 98% to 58% in three years.