Pendle

Pendle is an open-source DeFi yield trading protocol launched in 2021 that lets users separate the principal and future yield components of yield-bearing ERC-20 tokens into independently tradable instruments. Depositing a yield-bearing asset such as stETH, aUSDC, or a liquid staking token into Pendle wraps it via the Standardized Yield (SY) interface and divides it into Principal Tokens (PT) and Yield Tokens (YT). PT grants the right to redeem the underlying principal at a set maturity date, while YT entitles holders to all yield generated by the underlying position from deposit until maturity, enabling separate trading or holding of each part.

Pendle operates at app.pendle.finance across numerous EVM-compatible networks including Ethereum, Arbitrum, BNB Chain, Mantle, Optimism, Base, Sonic, HyperEVM, Berachain, Monad, Katana, Ink, and additional supported chains, with yield markets built around a wide variety of yield-bearing assets including RWAs. The PENDLE token supports governance via the sPENDLE staking mechanism launched in January 2026, where holders stake to earn protocol fee distributions through buybacks and participate in incentive direction. Open-source smart contract code and audit reports are hosted under the pendle-finance GitHub organization, with documentation and integration guides available at docs.pendle.finance.

Users start at app.pendle.finance by exploring active yield markets sorted by underlying asset and chain. Each market shows the current fixed yield for PT buyers, calculated as the annualized return if bought at the prevailing price and held to maturity, along with YT yield exposure for those seeking leveraged variable yield. After connecting an EVM wallet, users select a market and opt to buy PT for fixed yield, purchase YT for variable yield exposure, or supply liquidity to the associated Pendle AMM pool.

The Pendle AMM is a specialized automated market maker that prices yield instruments with consideration for time decay as maturity approaches. PT value converges to the underlying redemption amount while YT value trends to zero; the AMM's pricing invariant incorporates this time-dependent decay, setting it apart from standard constant-product models. Upon maturity, PT holders redeem at full underlying value, and YT holders have already collected all accrued yield over the market's life.

Pendle's tokenization relies on the Standardized Yield (SY) interface implementing EIP-5115, a standard for uniformly wrapping yield-bearing tokens. EIP-5115 offers consistent deposit, withdrawal, and yield tracking across diverse assets from protocols like liquid staking, Aave aTokens, Compound cTokens, and others, enabling uniform PT/YT creation and AMM handling regardless of the original yield source. The SY layer standardizes protocol-specific mechanics so PT and YT pairs function consistently across asset types.

Fixed-yield positions via PT let users buy at a discount to redemption value, where the discount represents the market-implied yield to maturity. At expiry, PT redeems for the full underlying asset, delivering the predetermined return irrespective of interim APY changes. This provides predictable outcomes at the chosen maturity, contrasting with variable-rate DeFi yields.

YT captures the entire yield stream of an asset over a specific period, granting holders all accrued yield from purchase to maturity. Acquiring YT offers leveraged exposure to yield rate movements; if realized yields surpass the YT cost, the holder profits. Since YT covers only the yield portion, its price is typically a fraction of the underlying, amplifying sensitivity to rate shifts, while its value declines toward zero as maturity nears, suiting traders forecasting yield dynamics.

The sPENDLE model, launched in January 2026, lets PENDLE holders stake tokens to gain protocol fee shares via regular buybacks (80% of yield and swap fees) and influence incentive allocations across markets. This staking approach replaced earlier vePENDLE locking with a more flexible 14-day unstaking window or instant exit option at a 5% fee, boosting participation and aligning long-term holders with ongoing trading activity and fee revenue.

Pendle enables diverse yield strategies: fixed-yield participants buy PT to lock in known returns at maturity without variable APY risk; yield speculators purchase YT for leveraged bets on rising yields; liquidity providers add assets to AMM pools for swap fees and incentives; sPENDLE stakers direct emissions and receive fee buybacks proportional to their stake; and other protocols integrate Pendle's SY, PT, and YT infrastructure for custom fixed-yield or yield-trading features using documented contract interfaces.

Developers access integration resources at docs.pendle.finance, including deployment references listing contract addresses, active markets, and interfaces for SY wrappers, markets, and routers. Open-source repositories on GitHub under pendle-finance provide full PT, YT, and SY implementations with ABIs for on-chain or off-chain queries and programmatic trades. Contract interfaces allow interaction with live markets without proprietary endpoints.

Security details are documented at docs.pendle.finance/pendle-v2/Security, covering the protocol model and audit history. Audit reports reside in a dedicated GitHub repository under pendle-finance/pendle-core-v2-public/tree/main/audits for transparent review of V2 contracts across versions and chains. All source code is publicly available on GitHub. As a non-custodial system, Pendle executes deposits, splits, AMM swaps, and redemptions solely through on-chain contracts without centralized custody. Users should examine audits and documentation prior to engaging with markets.

Pendle delivers open-source yield tokenization and trading infrastructure on Ethereum and numerous EVM networks, leveraging EIP-5115 SY to split assets into PT and YT for fixed yields and leveraged exposure. The sPENDLE governance system launched in 2026, comprehensive audit repository, and developer resources at docs.pendle.finance provide structured access to contracts and mechanics. Evaluators should consult the documentation, security materials, and audit history to understand market structures, tokenization processes, and time-to-maturity considerations before committing to PT, YT, or liquidity positions.