Crypto Gloss

Yield Stripping

Yield stripping is a DeFi financial derivative mechanism that takes a yield-bearing token (any token that accrues interest, staking rewards, or other yield over time: stETH, weETH, aUSDC, gUSDC) and splits it into two separate tradeable tokens: a Principal Token (PT) representing a claim to redeem the full underlying principal at a fixed future maturity date, and a Yield Token (YT) representing the right to receive all yield generated by the underlying from now until maturity. The separation enables two completely different investment strategies from a single underlying: purchasing PT is equivalent to buying a zero-coupon bond at a discount (pay less now; receive full principal later; implied fixed yield); purchasing YT is equivalent to buying an interest-only strip (receive all interest payments; principal returns to PT holder). This mirrors centuries-old bond market mechanisms (US Treasury STRIPS: Separate Trading of Registered Interest and Principal Securities) but applied to DeFi yield-bearing tokens. Pendle Finance is the primary protocol implementing yield stripping in DeFi — accounting for nearly all yield stripping volume — and reached $6B+ TVL at peak (2024) by applying yield stripping to LSTs (stETH, rETH) and LRTs (weETH, ezETH), creating derivatives markets for EigenLayer points exposure that attracted billions of dollars from yield speculators and points maximizers.

Key Facts

  • Mechanism: Split yield-bearing token into PT (principal) + YT (yield only)
  • Primary protocol: Pendle Finance
  • Traditional equivalent: Bond stripping (US Treasury STRIPS; interest-only and principal-only strips)
  • PT equivalent: Zero-coupon bond (buy at discount; receive par at maturity)
  • YT equivalent: Interest-only strip (receive yield payments; no principal return)
  • Maturity: Fixed date (weekly/monthly/quarterly maturities on Pendle)
  • Key underlying assets: stETH, wstETH, weETH, ezETH, aUSDC, GLP, various yield tokens
  • Pendle peak TVL: $6B+ (2024, driven primarily by weETH markets)

How Yield Stripping Works

The following sections cover this in detail.

Step 1: Standardize the Underlying

Pendle: wraps all yield tokens into SY (Standardized Yield Token) — ERC-5115 standard

  • stETH → SY-stETH
  • weETH → SY-weETH
  • Any ERC-4626 token → SY equivalent
  • SY: unified interface for all yield-bearing tokens

Step 2: Split SY into PT + YT

User: deposits SY into Pendle → mints:

  • PT-stETH (maturity: Dec 31, 2024): right to redeem 1 stETH on Dec 31, 2024
  • YT-stETH (maturity: Dec 31, 2024): receives ALL stETH yield (staking rewards) from now until Dec 31, 2024

Conservation law: PT + YT = SY (always)

  • Minting: deposit 1 SY-stETH → receive 1 PT + 1 YT
  • Burning: deposit 1 PT + 1 YT → receive 1 SY-stETH

Step 3: Trade PT and YT on Pendle AMM

Pendle: custom AMM optimized for PT/YT pricing:

  • PT: trades at discount to SY (PT price < 1 SY; implied yield = discount / duration)
  • YT: trades at fraction of SY price (YT price << 1 SY; huge yield leverage)
  • PT + YT market prices: must sum to SY price in equilibrium (arbitrageable)

Step 4: At Maturity

  • PT: redeems 1:1 for underlying (1 PT-stETH → 1 stETH; regardless of when purchased or at what price)
  • YT: expires worthless (yield stream ended; principal: already with PT holder)

Why Yield Stripping Enables New Strategies

The following sections cover this in detail.

Fixed Yield (PT Strategy)

Profile: Risk-averse ETH holders

Example: Current stETH staking yield: 4% APY (variable)

  • Uncertainty: yield may fall to 3% in bear market validator influx
  • Pendle PT-stETH (6 months to maturity): priced at 0.98 stETH
  • Implied yield: (1 – 0.98) / 0.98 × (12/6 months) = 4.08% APY (fixed)
  • Decision: Buy PT at 0.98; lock in 4.08% fixed for 6 months
  • At maturity: receive 1 stETH per PT (regardless of what actual staking yield was)
  • Win: if actual staking yield falls below 4.08%; Lose: if actual staking yield rises above 4.08% (you gave up upside)

Leveraged Yield (YT Strategy)

Profile: Yield speculators, points maximizers

Example: YT-weETH priced at 0.05 weETH

  • $100 buys: 2,000 YT-weETH
  • Each YT: receives yield from 1 weETH → receive yield from 2,000 weETH with $100 investment
  • Points: each YT: receives ALL EigenLayer points + ETHFI points from 1 weETH
  • 2,000 YT = 2,000 weETH worth of points with only $100 invested (= $200K weETH × 0.05%)
  • Win: if EigenLayer airdrop > $0.05 per weETH worth of points
  • Maximum loss: $100 (cost of YT; expires worthless at worst)

Yield Arbitrage

Profile: DeFi arbitrageurs

Mechanism: If PT implied yield ≠ stETH actual APY → arbitrage opportunity

  • PT implies 4% fixed; actual stETH: 5%
  • Buy stETH (5%); mint PT+YT; sell YT; hold PT at 4% fixed
  • Near-risk-free: 100bps yield pickup
  • Arbitrage: closes gap; market: efficient

Bond Market Analogy

DeFi Traditional Finance
Yield-bearing token (stETH) Fixed income bond
PT (Principal Token) Zero-coupon bond / IO-stripped principal
YT (Yield Token) Interest-only strip
Pendle AMM Treasury STRIPS market
Maturity date Bond maturity date
Implied fixed rate Bond yield-to-maturity

US Treasury STRIPS: Since 1985, US Treasury: allows bond dealers to strip Treasury bonds into separate principal and interest components; each component: trades separately; US market: $300B+ in STRIPS outstanding; analogous mechanism — different asset class.

Risks

PT risks (low):

  • Protocol risk (Pendle smart contract)
  • Underlying asset risk (stETH: Lido risk)
  • Maturity redemption risk (Pendle: must be live at maturity)

YT risks (high):

  • Yield collapses: YT income: approaches zero → YT worthless at maturity
  • Time decay: YT value → 0 as maturity approaches (any remaining yield: less valuable)
  • Leverage loss: small capital invested; total loss possible
  • Protocol + underlying risk: same as PT but with leverage

Related Terms

Sources

  1. “Pendle Finance: Architecture and Market Design for DeFi Yield Stripping” — Pendle Finance / Protocol Documentation (2024). Technical deep-dive into Pendle Finance’s implementation of yield stripping — examining the SY (Standardized Yield Token) standard (ERC-5115: unified interface for all yield-bearing tokens), the PT/YT minting and burning mechanism (conservation law: PT + YT = SY), the custom Pendle AMM (designed for time-decay of PT pricing unlike standard constant-product AMMs), and the veTokenomics (vePENDLE for governance, fee sharing, and yield boosting) that sustain the platform’s incentive ecosystem.
  1. “The Time Value of Yield: How PT and YT Pricing Reflects DeFi’s Implied Yield Curve” — DeFi Research / Yield Curve Analysis (2024). Analysis of how Pendle’s PT prices across different maturities (weekly, monthly, quarterly, annual) create an implied yield curve for liquid staking tokens — examining whether Pendle’s implied yields are accurate predictions of future staking yields, how market participants’ expectations about Ethereum validator counts, protocol upgrades, and restaking dynamics are priced into the yield curve, and what the stETH yield curve’s shape reveals about market consensus on Ethereum staking economics over 2-3 year horizons.
  1. “Treasury STRIPS and Pendle PT/YT: Building DeFi’s Fixed Income Revolution” — Cross-Asset Research (2024). Comparative analysis of the US Treasury STRIPS market (the traditional finance precedent for yield stripping) and Pendle Finance’s DeFi implementation — examining the similarities and differences in mechanism (both: separate principal from yield), participants (TradFi: primarily institutional bond desks; DeFi: mixed retail and institutional), market size ($300B STRIPS vs. $6B Pendle peak), the regulatory and settlement differences, and what the success of the STRIPS market over 40 years suggests about the long-term potential for DeFi yield stripping markets.
  1. “YT and Points Farming: How EigenLayer Speculation Transformed Yield Stripping into a Points Arbitrage Market” — DeFi Research Collective / Points Derivatives Analysis (2024). Analysis of how the EigenLayer points + ETHFI airdrop speculation transformed Pendle’s weETH yield markets from traditional yield curve instruments into points-speculation vehicles — examining how YT-weETH’s implied yield reached 30-50%+ APY (versus underlying staking yield of ~5%) because YT holders received all EigenLayer points + ETHFI points per underlying weETH unit, the mathematical arbitrage created (pay cheap YT; receive all points from expensive underlying; if points worth enough: huge profit), and the post-airdrop normalization of weETH implied yields.
  1. “Maturity Management in Yield Stripping: Rolling Positions, Yield Duration Risk, and Exit Mechanics” — Academic / Pendle Risk Analysis (2024). Technical analysis of the practical operational aspects of yield stripping strategies — examining how investors manage PT/YT positions across multiple maturities (rolling strategy: sell PT near maturity; buy next maturity PT; maintain fixed yield exposure); the duration risk of holding YT (time decay accelerates as maturity approaches); the specific exit mechanics for PT (Pendle redemption vs. AMM sale) and YT (AMM sale vs. holding to maturity); and how Pendle’s AMM handles the time-decay property of PT pricing without requiring constant rebalancing.