Pendle Standardized Yield (SY) Contracts

This repository contains the Standardized Yield (SY) smart contracts of Pendle Protocol, which serve as wrappers around various yield-bearing tokens to standardize their interfaces and behaviors.

Overview

The SY contracts provide a unified interface for interacting with different yield-bearing tokens across DeFi protocols, including:

• Liquid Staking Derivatives (Lido, Renzo, Swell, etc.)
• Lending Protocols (Aave, Venus, Flux)
• AMM LP Tokens (GMX, Thena)
• Yield Aggregators (Convex)
• And many more

Key Features

• Standardized deposit/redeem interface
• Support for native tokens and wrapped versions
• Reward handling for protocols with yield farming
• Exchange rate calculations
• Preview functions for deposits and redemptions

Contract Structure

• Base contracts:

  • SYBase.sol: Core base contract for basic SY functionality
  • SYBaseWithRewards.sol: Extended base for SYs with reward claiming
  • SYBaseUpg.sol: Upgradeable version of the base contract

• Implementation contracts:

  • Protocol-specific implementations inheriting from base contracts
  • Each implementation handles the unique aspects of interacting with its underlying protocol

License

BUSL-1.1

Links

• Website: https://pendle.finance
• Documentation: https://docs.pendle.finance/Developers/Overview
• GitHub: https://github.com/pendle-finance/pendle-sy