Pendle

Pendle is an open-source DeFi yield trading protocol launched in 2021 that enables users to separate the principal and future yield components of yield-bearing ERC-20 tokens into independently tradeable instruments. When a user deposits a yield-bearing asset into Pendle — such as stETH, aUSDC, or a liquid staking token — the protocol wraps it using the Standardized Yield (SY) interface and splits it into two tokens: Principal Tokens (PT) and Yield Tokens (YT). PT represents the right to redeem the underlying principal at a defined maturity date, while YT represents entitlement to all yield generated by the underlying position between deposit and maturity, allowing users to trade or hold each component separately

Pendle is accessible at app.pendle.finance and operates across multiple EVM-compatible networks including Ethereum, Arbitrum, BNB Chain, Mantle, and other supported chains, with yield markets created around a diverse range of supported yield-bearing assets. The PENDLE token is used for governance participation through the vePENDLE locking mechanism — PENDLE holders who lock their tokens as vePENDLE gain voting power for directing protocol incentives and participate in protocol fee distributions. Open-source smart contract source code and audit reports are available through the pendle-finance GitHub organization, with documentation and developer integration references maintained at docs.pendle.finance

The primary interaction with Pendle begins at app.pendle.finance, where users browse active yield markets organized by underlying yield-bearing asset and chain. Each market displays the current fixed yield available for PT buyers — representing the annualized return if PT is purchased at the current price and held to maturity — and the current YT yield exposure available for users who want leveraged access to the underlying asset's variable yield rate. Users connect an EVM-compatible wallet, select an active market, and choose between buying PT for a fixed yield position, buying YT for variable yield exposure, or adding liquidity to the market's Pendle AMM pool

The Pendle AMM is a specialized automated market maker designed to price yield instruments accurately as they approach their maturity date, accounting for the time-dependent nature of yield token value. As the maturity date approaches, the value of PT converges toward the underlying asset's redemption value and the value of YT converges toward zero — the AMM's pricing model accounts for this time decay in its invariant, making it distinct from general-purpose constant product AMMs in how it handles the passage of time. At maturity, PT holders redeem their tokens for the underlying asset at the full redemption value, and YT holders have already received all yield accrued during the market's duration

Pendle's yield tokenization model is built on the Standardized Yield (SY) interface, which implements EIP-5115 — a standardized interface for wrapping yield-bearing tokens into a uniform on-chain representation. EIP-5115 provides a common deposit, withdrawal, and yield accrual interface for diverse yield-bearing assets from different protocols — including liquid staking tokens, Aave aTokens, Compound cTokens, and other yield-bearing positions — allowing Pendle to handle these assets consistently in its splitting and AMM logic regardless of the underlying yield mechanism. The SY wrapping layer abstracts protocol-specific yield accrual mechanics so that PT and YT token pairs can be generated uniformly across supported asset types

Fixed yield strategies using PT represent one of the primary ways users interact with Pendle: when a user purchases PT at a price below the underlying asset's redemption value, the discount reflects the market's implied yield over the remaining period to maturity. At maturity, PT is redeemable for the full underlying asset value, and the difference between the purchase price and redemption value constitutes the fixed yield earned over the holding period, regardless of how the underlying asset's variable APY fluctuates in the interim. This fixed yield exposure allows users to plan for a known outcome at the selected maturity date, unlike typical DeFi yield positions where the return is fully dependent on variable protocol rates

YT represents the yield stream of a yield-bearing asset over a defined period, giving holders the right to receive all yield accrued by the underlying position between the purchase date and maturity. Buying YT provides leveraged long exposure to the underlying asset's yield rate — if the realized yield over the period exceeds the YT's purchase cost, the YT holder generates a positive return on their yield purchase. Because YT represents only the yield component and not the principal, its cost is typically a small fraction of the full underlying asset price, meaning that yield rate changes have an amplified effect on YT's value relative to the cost paid. YT's value trends toward zero as the remaining time to maturity decreases, making it a time-sensitive instrument that rewards traders who accurately anticipate yield rate movements

The vePENDLE governance model allows PENDLE token holders to participate in protocol governance and incentive direction by locking their PENDLE tokens for a defined period. vePENDLE holders vote on the allocation of PENDLE emissions across active Pendle yield markets, influencing the APY available to liquidity providers in each market and directing activity toward markets relevant to their strategy. In addition to governance voting power, vePENDLE holders receive a portion of swap fees collected by Pendle AMM pools, aligning incentives between long-term protocol participants and the protocol's ongoing market activity. The locking and reward mechanics are documented in the Pendle documentation at docs.pendle.finance and are open to any PENDLE holder who chooses to participate in governance

Pendle supports a range of yield trading and fixed-income DeFi use cases: fixed-yield seekers purchase PT in active Pendle markets to lock in a known return on their capital at a specific maturity date, removing exposure to variable APY rate fluctuations; yield traders buy YT to gain leveraged long exposure to a supported asset's yield rate when they anticipate yields rising above the market's implied rate; liquidity providers deposit yield-bearing assets into Pendle AMM pools to earn swap fee revenue from yield market trading activity; vePENDLE holders vote to direct PENDLE emissions toward markets relevant to their strategy and earn protocol fee distributions proportional to their locked balance; and DeFi protocols integrate Pendle's SY interface and PT/YT market infrastructure to offer fixed-yield or yield-trading functionality to their own users through the contract interfaces documented at docs.pendle.finance/pendle-v2/Developers/Deployments

Developer integration with Pendle is supported through the documentation at docs.pendle.finance, including the developer deployment reference at docs.pendle.finance/pendle-v2/Developers/Deployments, which covers supported chain contract addresses, deployed market listings, and interface documentation for the SY wrapper, market, and router contracts. The open-source smart contract repositories are available on GitHub at github.com/pendle-finance, allowing developers to inspect the PT, YT, and SY contract implementations and ABI definitions for integrating Pendle yield markets into on-chain protocols or off-chain applications that need to query market state, read yield accrual data, or execute PT/YT trades programmatically. Developers building on top of Pendle can use the documented contract interfaces to interact with active yield markets without requiring access to a proprietary data endpoint

Pendle maintains security documentation at docs.pendle.finance/pendle-v2/Security, which provides information on the protocol's security model and audit history. Smart contract audit reports are collected in a dedicated repository at github.com/pendle-finance/pendle-core-v2-public/tree/main/audits, providing transparent access to the security review history for the core Pendle V2 contracts across deployed versions and network deployments. All Pendle smart contract source code is publicly available on GitHub under the pendle-finance organization for independent review. As a non-custodial protocol, Pendle does not hold user funds in a centralized account — deposits, PT/YT splits, AMM swaps, and redemptions at maturity are all executed through on-chain smart contracts with no centralized intermediary taking custody of assets. Users and developers evaluating Pendle should review the audit repository and security documentation before deploying capital into yield markets

Pendle provides open-source yield tokenization and yield trading infrastructure across Ethereum and multiple EVM-compatible networks, using the EIP-5115 Standardized Yield interface to split yield-bearing assets into tradeable PT and YT components for fixed yield positions and leveraged yield exposure. The vePENDLE governance system, published audit repository at github.com/pendle-finance/pendle-core-v2-public/tree/main/audits, and developer documentation at docs.pendle.finance/pendle-v2/Developers/Deployments give developers and yield traders structured access to the protocol's contract infrastructure and governance mechanics. Teams and users evaluating Pendle should review the documentation at docs.pendle.finance, the security documentation, and the audit repository to understand market structure, yield tokenization mechanics, and time-to-maturity risk before allocating capital to PT, YT, or liquidity pool positions