Most DeFi yield is variable. You deposit staked ETH or a stablecoin into a lending protocol and whatever rate the market happens to clear, that’s what you earn. If rates fall, you earn less. If rates spike, you earn more. You have no way to lock that in.

Pendle Finance is built around one insight: yield can be separated from principal and traded independently. Once you do that, a new class of strategies becomes possible.

How Pendle Splits a Yield-Bearing Token

When you deposit a yield-bearing asset into Pendle, the protocol wraps it and splits it into two tokens:

  • Principal Token (PT): Represents the underlying asset at maturity. If you buy one PT-stETH expiring in six months at a discount, you receive one stETH at expiry regardless of what happens to yield in the meantime. That discount is your implied fixed rate.
  • Yield Token (YT): Represents all the yield that asset generates between now and the maturity date. Buying YT means you receive the streaming yield; selling it means you give that yield stream to someone else in exchange for upfront cash.

Both tokens trade on Pendle’s automated market maker, which is purpose-built for assets that have a defined expiry date. Standard AMM designs don’t account for time decay; Pendle’s AMM does.

The Two Main Use Cases

Locking in a fixed rate. A user who wants predictable returns buys PT at a discount and holds to maturity. The discount gap between purchase price and par value is the fixed yield. No exposure to rate movements after entry.

Leveraged yield exposure. A user who thinks yields on a particular asset are about to rise can buy YT. YT holders receive the full yield generated by the underlying position, so if you buy YT representing ten units of an asset, you collect the yield on ten units while only paying for the yield stream, not the principal. This amplifies exposure to rate increases and amplifies losses if rates fall.

Liquidity providers can also supply to Pendle’s AMM pools to earn trading fees and protocol incentives, though this involves exposure to both PT and YT price movements.

What Assets Are Supported

Pendle works with any yield-bearing token that has a predictable redemption mechanism. The protocol has built markets around liquid staking tokens (wstETH, sUSDe, stS), yield-bearing stablecoins (USDE from Ethena, DAI savings rate variants), and lending receipt tokens from protocols like Aave and Sky.

Pendle is deployed on Ethereum mainnet, Arbitrum, BNB Chain, and Optimism. Markets are created with fixed expiry dates, typically ranging from one to twelve months out. Once a market expires, the underlying assets can be redeemed or rolled into new markets.

Why This Matters for the DeFi Rate Market

Traditional fixed income exists because not every saver wants variable rate exposure and not every borrower wants to guess where rates go. The ability to separate and trade that variable component is foundational to how conventional credit markets work.

DeFi has mostly lacked this layer. Pendle is the most active attempt to build it on-chain. When a trader buys PT-stETH at a fixed rate, someone else on the other side of that trade is taking the variable rate exposure. The yield market clears in real time.

This also creates a reference rate for DeFi yields. If the market prices PT-stETH at a given implied rate, that tells you what the market expects average staking returns to look like over the remaining term. That’s information that didn’t exist on-chain before.

Risks to Understand

PT buyers are exposed to smart contract risk in both Pendle and the underlying protocol. If the underlying yield-bearing token has a redemption bug or the underlying collateral depegs, PT does not simply pay out par.

YT buyers face decay risk. YT tokens lose value as time passes even if yields stay constant, because there is less remaining yield to collect. A YT token held to expiry with no yield accrued is worth zero. This makes YT a time-sensitive instrument, not a passive hold.

Liquidity on long-dated or obscure markets can also be thin, which affects how cleanly traders can enter and exit positions without price impact.

The Broader Picture

Pendle has added something that most DeFi protocols do not offer: a mechanism for price discovery around time-value and forward rates. Lending protocols give you a current rate. Pendle gives you a market for what rates will be over a defined future window.

For users managing larger positions or building structured DeFi strategies, that distinction matters. Fixed-rate positions allow treasury management, hedged yield strategies, and more predictable cash flow accounting. Those are features institutional participants and on-chain DAOs increasingly ask for.

The protocol is not trying to replace lending markets. It is trying to sit on top of them and add the rate market layer that was always missing.