Implement DeFi protocols with production-ready templates for staking, AMMs, governance, and lending systems. Use when building decentralized finance applications or smart contract protocols.
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Production-ready templates for common DeFi protocols including staking, AMMs, governance, lending, and flash loans.
resources/implementation-playbook.md.// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
contract StakingRewards is ReentrancyGuard, Ownable {
IERC20 public stakingToken;
IERC20 public rewardsToken;
uint256 public rewardRate = 100; // Rewards per second
uint256 public lastUpdateTime;
uint256 public rewardPerTokenStored;
mapping(address => uint256) public userRewardPerTokenPaid;
mapping(address => uint256) public rewards;
mapping(address => uint256) public balances;
uint256 private _totalSupply;
event Staked(address indexed user, uint256 amount);
event Withdrawn(address indexed user, uint256 amount);
event RewardPaid(address indexed user, uint256 reward);
constructor(address _stakingToken, address _rewardsToken) {
stakingToken = IERC20(_stakingToken);
rewardsToken = IERC20(_rewardsToken);
}
modifier updateReward(address account) {
rewardPerTokenStored = rewardPerToken();
lastUpdateTime = block.timestamp;
if (account != address(0)) {
rewards[account] = earned(account);
userRewardPerTokenPaid[account] = rewardPerTokenStored;
}
_;
}
function rewardPerToken() public view returns (uint256) {
if (_totalSupply == 0) {
return rewardPerTokenStored;
}
return rewardPerTokenStored +
((block.timestamp - lastUpdateTime) * rewardRate * 1e18) / _totalSupply;
}
function earned(address account) public view returns (uint256) {
return (balances[account] *
(rewardPerToken() - userRewardPerTokenPaid[account])) / 1e18 +
rewards[account];
}
function stake(uint256 amount) external nonReentrant updateReward(msg.sender) {
require(amount > 0, "Cannot stake 0");
_totalSupply += amount;
balances[msg.sender] += amount;
stakingToken.transferFrom(msg.sender, address(this), amount);
emit Staked(msg.sender, amount);
}
function withdraw(uint256 amount) public nonReentrant updateReward(msg.sender) {
require(amount > 0, "Cannot withdraw 0");
_totalSupply -= amount;
balances[msg.sender] -= amount;
stakingToken.transfer(msg.sender, amount);
emit Withdrawn(msg.sender, amount);
}
function getReward() public nonReentrant updateReward(msg.sender) {
uint256 reward = rewards[msg.sender];
if (reward > 0) {
rewards[msg.sender] = 0;
rewardsToken.transfer(msg.sender, reward);
emit RewardPaid(msg.sender, reward);
}
}
function exit() external {
withdraw(balances[msg.sender]);
getReward();
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
contract SimpleAMM {
IERC20 public token0;
IERC20 public token1;
uint256 public reserve0;
uint256 public reserve1;
uint256 public totalSupply;
mapping(address => uint256) public balanceOf;
event Mint(address indexed to, uint256 amount);
event Burn(address indexed from, uint256 amount);
event Swap(address indexed trader, uint256 amount0In, uint256 amount1In, uint256 amount0Out, uint256 amount1Out);
constructor(address _token0, address _token1) {
token0 = IERC20(_token0);
token1 = IERC20(_token1);
}
function addLiquidity(uint256 amount0, uint256 amount1) external returns (uint256 shares) {
token0.transferFrom(msg.sender, address(this), amount0);
token1.transferFrom(msg.sender, address(this), amount1);
if (totalSupply == 0) {
shares = sqrt(amount0 * amount1);
} else {
shares = min(
(amount0 * totalSupply) / reserve0,
(amount1 * totalSupply) / reserve1
);
}
require(shares > 0, "Shares = 0");
_mint(msg.sender, shares);
_update(
token0.balanceOf(address(this)),
token1.balanceOf(address(this))
);
emit Mint(msg.sender, shares);
}
function removeLiquidity(uint256 shares) external returns (uint256 amount0, uint256 amount1) {
uint256 bal0 = token0.balanceOf(address(this));
uint256 bal1 = token1.balanceOf(address(this));
amount0 = (shares * bal0) / totalSupply;
amount1 = (shares * bal1) / totalSupply;
require(amount0 > 0 && amount1 > 0, "Amount0 or amount1 = 0");
_burn(msg.sender, shares);
_update(bal0 - amount0, bal1 - amount1);
token0.transfer(msg.sender, amount0);
token1.transfer(msg.sender, amount1);
emit Burn(msg.sender, shares);
}
function swap(address tokenIn, uint256 amountIn) external returns (uint256 amountOut) {
require(tokenIn == address(token0) || tokenIn == address(token1), "Invalid token");
bool isToken0 = tokenIn == address(token0);
(IERC20 tokenIn_, IERC20 tokenOut, uint256 resIn, uint256 resOut) = isToken0
? (token0, token1, reserve0, reserve1)
: (token1, token0, reserve1, reserve0);
tokenIn_.transferFrom(msg.sender, address(this), amountIn);
// 0.3% fee
uint256 amountInWithFee = (amountIn * 997) / 1000;
amountOut = (resOut * amountInWithFee) / (resIn + amountInWithFee);
tokenOut.transfer(msg.sender, amountOut);
_update(
token0.balanceOf(address(this)),
token1.balanceOf(address(this))
);
emit Swap(msg.sender, isToken0 ? amountIn : 0, isToken0 ? 0 : amountIn, isToken0 ? 0 : amountOut, isToken0 ? amountOut : 0);
}
function _mint(address to, uint256 amount) private {
balanceOf[to] += amount;
totalSupply += amount;
}
function _burn(address from, uint256 amount) private {
balanceOf[from] -= amount;
totalSupply -= amount;
}
function _update(uint256 res0, uint256 res1) private {
reserve0 = res0;
reserve1 = res1;
}
function sqrt(uint256 y) private pure returns (uint256 z) {
if (y > 3) {
z = y;
uint256 x = y / 2 + 1;
while (x < z) {
z = x;
x = (y / x + x) / 2;
}
} else if (y != 0) {
z = 1;
}
}
function min(uint256 x, uint256 y) private pure returns (uint256) {
return x <= y ? x : y;
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "@openzeppelin/contracts/token/ERC20/extensions/ERC20Votes.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
contract GovernanceToken is ERC20Votes, Ownable {
constructor() ERC20("Governance Token", "GOV") ERC20Permit("Governance Token") {
_mint(msg.sender, 1000000 * 10**decimals());
}
function _afterTokenTransfer(
address from,
address to,
uint256 amount
) internal override(ERC20Votes) {
super._afterTokenTransfer(from, to, amount);
}
function _mint(address to, uint256 amount) internal override(ERC20Votes) {
super._mint(to, amount);
}
function _burn(address account, uint256 amount) internal override(ERC20Votes) {
super._burn(account, amount);
}
}
contract Governor is Ownable {
GovernanceToken public governanceToken;
struct Proposal {
uint256 id;
address proposer;
string description;
uint256 forVotes;
uint256 againstVotes;
uint256 startBlock;
uint256 endBlock;
bool executed;
mapping(address => bool) hasVoted;
}
uint256 public proposalCount;
mapping(uint256 => Proposal) public proposals;
uint256 public votingPeriod = 17280; // ~3 days in blocks
uint256 public proposalThreshold = 100000 * 10**18;
event ProposalCreated(uint256 indexed proposalId, address proposer, string description);
event VoteCast(address indexed voter, uint256 indexed proposalId, bool support, uint256 weight);
event ProposalExecuted(uint256 indexed proposalId);
constructor(address _governanceToken) {
governanceToken = GovernanceToken(_governanceToken);
}
function propose(string memory description) external returns (uint256) {
require(
governanceToken.getPastVotes(msg.sender, block.number - 1) >= proposalThreshold,
"Proposer votes below threshold"
);
proposalCount++;
Proposal storage newProposal = proposals[proposalCount];
newProposal.id = proposalCount;
newProposal.proposer = msg.sender;
newProposal.description = description;
newProposal.startBlock = block.number;
newProposal.endBlock = block.number + votingPeriod;
emit ProposalCreated(proposalCount, msg.sender, description);
return proposalCount;
}
function vote(uint256 proposalId, bool support) external {
Proposal storage proposal = proposals[proposalId];
require(block.number >= proposal.startBlock, "Voting not started");
require(block.number <= proposal.endBlock, "Voting ended");
require(!proposal.hasVoted[msg.sender], "Already voted");
uint256 weight = governanceToken.getPastVotes(msg.sender, proposal.startBlock);
require(weight > 0, "No voting power");
proposal.hasVoted[msg.sender] = true;
if (support) {
proposal.forVotes += weight;
} else {
proposal.againstVotes += weight;
}
emit VoteCast(msg.sender, proposalId, support, weight);
}
function execute(uint256 proposalId) external {
Proposal storage proposal = proposals[proposalId];
require(block.number > proposal.endBlock, "Voting not ended");
require(!proposal.executed, "Already executed");
require(proposal.forVotes > proposal.againstVotes, "Proposal failed");
proposal.executed = true;
// Execute proposal logic here
emit ProposalExecuted(proposalId);
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
interface IFlashLoanReceiver {
function executeOperation(
address asset,
uint256 amount,
uint256 fee,
bytes calldata params
) external returns (bool);
}
contract FlashLoanProvider {
IERC20 public token;
uint256 public feePercentage = 9; // 0.09% fee
event FlashLoan(address indexed borrower, uint256 amount, uint256 fee);
constructor(address _token) {
token = IERC20(_token);
}
function flashLoan(
address receiver,
uint256 amount,
bytes calldata params
) external {
uint256 balanceBefore = token.balanceOf(address(this));
require(balanceBefore >= amount, "Insufficient liquidity");
uint256 fee = (amount * feePercentage) / 10000;
// Send tokens to receiver
token.transfer(receiver, amount);
// Execute callback
require(
IFlashLoanReceiver(receiver).executeOperation(
address(token),
amount,
fee,
params
),
"Flash loan failed"
);
// Verify repayment
uint256 balanceAfter = token.balanceOf(address(this));
require(balanceAfter >= balanceBefore + fee, "Flash loan not repaid");
emit FlashLoan(receiver, amount, fee);
}
}
// Example flash loan receiver
contract FlashLoanReceiver is IFlashLoanReceiver {
function executeOperation(
address asset,
uint256 amount,
uint256 fee,
bytes calldata params
) external override returns (bool) {
// Decode params and execute arbitrage, liquidation, etc.
// ...
// Approve repayment
IERC20(asset).approve(msg.sender, amount + fee);
return true;
}
}
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Create or update AgentSkills. Use when designing, structuring, or packaging skills with scripts, references, and assets.
Set up and use 1Password CLI (op). Use when installing the CLI, enabling desktop app integration, signing in (single or multi-account), or reading/injecting/running secrets via op.
CLI to manage emails via IMAP/SMTP. Use `himalaya` to list, read, write, reply, forward, search, and organize emails from the terminal. Supports multiple accounts and message composition with MML (MIME Meta Language).