Building a Finite-Reward DeFi Staking Protocol With Solidity and Foundry
DeFi staking protocols appear simple from the outside: deposit tokens, wait, and receive rewards.
The difficult part is making the accounting behave correctly when multiple users are staking, withdrawing, claiming rewards, changing reward rates, and interacting with a reward pool that contains a finite number of tokens.
I built StakeVault to explore these problems in a complete Web3 application.
The protocol combines Solidity smart contracts, Foundry testing, and a React frontend deployed on Ethereum Sepolia.
The Core Problem
A staking protocol has to answer several questions:
- How much has each user deposited?
- How much has the entire protocol received?
- How long has each position been active?
- How should rewards be distributed between users?
- What happens when the reward pool runs out?
- How can the frontend represent global protocol state separately from individual wallet state?
StakeVault addresses these through separate user accounting and global accounting.
Global and Individual Staking State
Consider...
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