ERC20 Staking Pool

A simple and secure ERC20 staking pool smart contract built with Solidity and tested using Foundry.

This project allows users to stake ERC20 tokens, earn rewards over time, withdraw their stake, and claim accumulated rewards. The contract is protected against reentrancy attacks and uses OpenZeppelin's audited libraries.

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Features

• Stake ERC20 tokens
• Withdraw staked tokens
• Time-based reward distribution
• Claim accumulated rewards
• Owner-funded reward pool
• Configurable reward rate
• Reentrancy protection
• Comprehensive unit tests using Foundry

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Technologies

• Solidity ^0.8.20
• Foundry
• OpenZeppelin Contracts

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Project Structure

.
├── src/
│   ├── MockERC20.sol
│   └── StakingPool.sol
├── test/
│   ├── StakingPool.t.sol
│   ├── StakingPoolHandler.sol
│   └── StakingPoolInvariant.t.sol
├── lib/
├── foundry.toml
├── LICENSE
└── README.md

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Installation

Clone the repository:

git clone https://github.com/ArashGandomkar/StakingPool.git
cd StakingPool

Install dependencies:

forge install

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Build

forge build

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Run Tests

Run all tests:

forge test

Run tests with verbose output:

forge test -vvvv

Generate gas report:

forge test --gas-report

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Contract Overview

Stake

Users deposit ERC20 tokens into the staking pool.

Withdraw

Users can withdraw part or all of their staked tokens.

Rewards

Rewards accumulate over time according to the configured reward rate.

Claim Rewards

Users can claim their earned rewards at any time, provided the reward pool contains sufficient funds.

Owner Functions

The contract owner can:

• Fund the reward pool
• Update the reward rate

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Security

The contract uses:

• OpenZeppelin SafeERC20
• OpenZeppelin Ownable
• OpenZeppelin ReentrancyGuard

to improve security and reduce common vulnerabilities.

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Testing

The project includes unit tests covering:

• Staking
• Withdrawals
• Reward calculation
• Reward claiming
• Reward funding
• Owner permissions
• Revert scenarios
• Event emission

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License

This project is licensed under the MIT License.