defi-protocol-templates

1# DeFi Protocol Templates
2 
3Production-ready templates for common DeFi protocols including staking, AMMs, governance, and flash loans.
4 
5## When to Use This Skill
6 
7- Building staking platforms with reward distribution
8- Implementing AMM (Automated Market Maker) protocols
9- Creating governance token systems
10- Integrating flash loan functionality
11 
12## Staking Contract
13 
14```solidity
15// SPDX-License-Identifier: MIT
16pragma solidity ^0.8.0;
17 
18import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
19import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
20import "@openzeppelin/contracts/access/Ownable.sol";
21 
22contract StakingRewards is ReentrancyGuard, Ownable {
23    IERC20 public stakingToken;
24    IERC20 public rewardsToken;
25 
26    uint256 public rewardRate = 100; // Rewards per second
27    uint256 public lastUpdateTime;
28    uint256 public rewardPerTokenStored;
29 
30    mapping(address => uint256) public userRewardPerTokenPaid;
31    mapping(address => uint256) public rewards;
32    mapping(address => uint256) public balances;
33 
34    uint256 private _totalSupply;
35 
36    event Staked(address indexed user, uint256 amount);
37    event Withdrawn(address indexed user, uint256 amount);
38    event RewardPaid(address indexed user, uint256 reward);
39 
40    constructor(address _stakingToken, address _rewardsToken) {
41        stakingToken = IERC20(_stakingToken);
42        rewardsToken = IERC20(_rewardsToken);
43    }
44 
45    modifier updateReward(address account) {
46        rewardPerTokenStored = rewardPerToken();
47…