Pendle PT vs YT: A Worked Example With Real Numbers

What problem Pendle is actually solving

Most yield-bearing crypto assets, including staked ETH, restaked ETH, and synthetic dollar protocols, pay a variable rate. That rate moves with network activity, governance decisions, market demand for leverage, and broader liquidity conditions. For a saver, variability is fine. For a treasury, a market maker, or a structured product, variability is a problem, because planning around an income stream you cannot predict is hard.

Pendle's answer is to take a yield-bearing asset and split it into two separate tokens. One token owns the principal, the future redemption of the underlying at maturity. The other token owns the yield stream, the variable income generated between now and expiry. After the split, each piece trades independently on the open market, and each piece has its own price, its own yield, and its own risk profile.

This is not a new idea in traditional finance. Stripped bonds, interest-only and principal-only mortgage securities, and many structured notes do something similar. The difference is that Pendle does it on-chain, with smart contracts, and on assets where the underlying yield is itself a DeFi primitive. That extra layer of composability is also where the extra layer of risk comes from.

Risks specific to Pendle that most guides skip

Before running any numbers, the failure modes matter, because the worst-case outcomes are not just losing the trade. They are losing the principal to a bug, an oracle error, or a governance decision you did not vote on.

Smart-contract risk

Every Pendle position sits on top of at least three contracts: the Pendle router and its yield-tokenization logic, the underlying yield-bearing asset's contract, and the asset used to back it. A bug in any of those layers can freeze funds or drain the pool. Audits reduce, but do not eliminate, this risk. The same is true of historical exploits on other DeFi protocols.

Oracle risk

Pendle's PT and YT prices depend on an oracle that reports the implied yield curve. If the oracle is manipulated, delayed, or fed a bad data point during a volatile window, traders can be liquidated or settle at a price that does not reflect reality. Pendle has switched oracles over time as the market has learned what works, and each switch is a small bet that the new feed is more robust than the old one.

Underlying asset risk

PT-ETH or PT-stETH is only as safe as the underlying. If Lido's stETH depegs from ETH for a sustained period, if a restaking protocol suffers a slash event, or if a synthetic dollar like USDe or sUSDe breaks its peg, the principal value at maturity can fall. The fixed yield you locked in is irrelevant if the unit you redeem is worth less than you expected.

The YT-expiry trap

YT looks attractive because it can multiply your yield if rates stay high, but it does not have a floor. When the underlying yield drops below the implied fixed rate, the YT collects less and less over time, and at maturity it expires at zero. This is not a tail risk. It is the base case for a meaningful share of YT trades.

How the split actually works: a worked example

Let's walk through a single trade in detail, with the kind of numbers a user would see on the Pendle interface. The goal is not to recommend a position. It is to show the mechanics, so you can evaluate one yourself.

Step 1: pick a market and an asset

Suppose you look at the YT-stETH market with 90 days to expiry. stETH is Lido's staked ETH token; it earns the Lido staking reward, which is variable. Right now, the implied fixed yield, also called the PT implied APY, is showing 4.2 percent for that expiry. That is the rate you would lock in by buying PT today and holding to maturity.

Step 2: understand the price of PT

PT-stETH trades at a discount to 1 stETH. If the implied fixed yield is 4.2 percent annualized over 90 days, the discount is roughly 4.2 percent times 90/365, which is about 1.04 percent. So PT-stETH might be priced at 0.9896 stETH per PT. At maturity, every 1 PT redeems for exactly 1 stETH, regardless of what happens to staking rewards in between. Your profit is that 0.0104 stETH discount, which works out to the 4.2 percent annualized.

Step 3: understand the price of YT

YT-stETH is the other side of the trade. It is the right to collect all the staking rewards stETH generates over those 90 days. If you think staking yields will average 5.5 percent over that window, you are effectively buying a stream of income that is 1.3 percent per year richer than the implied rate. That sounds small, but YT is leveraged: a small change in the realized yield, relative to the implied yield, produces a large change in YT's value.

If realized yield is 5.5 percent, the YT is worth about 0.011 stETH per YT at expiry, on a notional of 1 stETH. If realized yield drops to 3.0 percent, the YT is worth almost nothing. The same is true at maturity, when YT pays out whatever accrued yield is left and then expires.

Step 4: what your P&L looks like in two scenarios

Scenario A: yields stay above the implied rate. You bought 10 YT at 0.005 stETH each, so 0.05 stETH of cost. Over 90 days, stETH earns 5.5 percent annualized. Your YT collects 0.0138 stETH in rewards. Profit on the YT: 0.088 stETH. The PT you did not buy would have given you 0.0104 stETH of discount. So YT outperformed PT by a factor of about 8 in this case, which is the leverage working in your favor.

Scenario B: yields fall below the implied rate. stETH earns 2.5 percent annualized. Your YT collects 0.0063 stETH. You paid 0.05 stETH. Loss: 0.0437 stETH, or about 87 percent of the position. The PT, in contrast, simply redeems at par and earns its 1.04 percent discount, a small but reliable gain. This is the asymmetry that catches new users: PT is bounded, YT is not.

Implied fixed yield vs variable yield: how to read the number

The implied fixed yield is the rate that makes PT and YT prices consistent with each other, given the market's expectation of future variable yields. If the market expects future variable yields to be high, the implied fixed yield has to be high too, otherwise no one would sell YT for cheap. If the market expects future variable yields to be low, the implied fixed yield falls, because YT is worth less and PT becomes more attractive.

You can think of it like this. PT is a bond that pays a fixed coupon until maturity. YT is a call option on the variable rate being higher than that coupon. The implied fixed yield is the strike; the realized yield is the underlying. In options terms, YT is long volatility on rates.

Reading the implied yield on the Pendle UI requires care. There are at least three numbers worth checking: the PT implied APY, the underlying base APY (what the asset currently earns), and the LP APY (what liquidity providers earn by holding both PT and YT). A high LP APY relative to the base APY usually means the market expects rates to fall, because YT is cheap and PT is rich.

Expiry mechanics: what actually happens at maturity

At expiry, the structure unwinds automatically. PT holders redeem their token for the underlying asset at a 1:1 ratio, plus any final yield accrued in the contract. YT holders receive their share of the yield accumulated since the last claim and then see YT become effectively worthless, since the future yield stream has reached zero length.

If the underlying is a rebasing token like stETH, the redemption is straightforward. If the underlying is a non-rebasing wrapper, like wstETH, the redemption reflects the appreciation of the wrapper. In all cases, the redemption value is the on-chain value of the underlying at expiry, not a guaranteed dollar value. If ETH has dropped 30 percent, your PT still gives you 1 stETH, but that 1 stETH is worth 30 percent less in dollar terms.

For the yield, expiry is when YT can no longer compound or accumulate. Any unclaimed yield must be redeemed before expiry, or it stays in the contract. Pendle's UI has improved on this, but unclaimed yield is still a real source of lost value for inattentive users.

Other examples worth knowing: ENA, sUSDe, and USDe markets

The same mechanics apply to newer yield-bearing assets. Pendle has run markets on Ethena's USDe and sUSDe, which earn yield from a combination of staking rewards and funding rates on perpetual futures. The implied fixed yield on YT-sUSDe has been significantly higher than on YT-stETH at times, sometimes 15 to 25 percent annualized. That is not free money. It reflects the market's view that funding rates may normalize, that the basis trade may compress, and that Ethena's yield has historically been mean-reverting.

A user looking at a high implied yield on YT-sUSDe should ask whether the underlying yield is structural or cyclical. If it is cyclical, the YT is a bet on a specific regime continuing, and the base case is mean reversion. If it is structural, the YT is a bet on a new kind of yield primitive that will outlast the current cycle. The two bets have very different risk profiles.

The same logic applies to restaked ETH markets, including PT-eETH and YT-eETH. Restaking adds a layer of yield, but it also adds a layer of slashing risk, and Pendle cannot hedge that for you. A high implied yield on a restaked asset is partly a compensation for that extra risk, not a sign that the yield is guaranteed.

Practical implications for evaluating a Pendle trade

The first question is not 'is the yield high?' It is 'why is the yield high?' If the implied fixed yield on PT is well above comparable risk-free rates in DeFi, there is a reason, and the reason is usually that the market expects variable yields to fall or that the underlying carries extra risk. Reading the implied yield as a pure rate is a mistake.

The second question is what you are actually buying. PT is closer to a bond. YT is closer to a leveraged bet on a yield path. They are not interchangeable. A balanced position is not 'half PT and half YT'. It is a view on the path of yields, sized to the risk you can take.

The third question is your exit. PT is best held to maturity, unless the market re-prices the implied yield sharply higher and you can sell at a tighter discount. YT is rarely held to expiry. Most YT trades close out before the final weeks, when the time decay accelerates. Planning the exit before entry is what separates traders who use Pendle from traders who get used by it.

How to follow Pendle and yield markets the smart way

Yield markets move fast, and the news that moves them, oracle upgrades, governance votes, large LP entries and exits, shifts in funding rates, does not arrive on a clean schedule. Tracking it manually, across Twitter, Discord, governance forums, and on-chain dashboards, is a losing game for most users. Zippfeed surfaces Pendle and broader DeFi yield headlines with sentiment scoring, bullish, neutral, or bearish, plus an importance rating, so you can see which moves are noise and which are signals worth repositioning around.