Slippage Guard — DeFi Router

Contract Details

Categorycontracts

Files14

Price$7.99

Tech Stack

Solidity ^0.8.24 OpenZeppelin v5 Chainlink Foundry

Chains

Ethereum Arbitrum Base Optimism

Description

Pre-trade simulation and slippage protection smart contract module. Simulates swap outcomes on-chain before execution, enforces maximum slippage tolerances, and provides Chainlink oracle-based price validation. Composable module that wraps any DEX router call.

Features

✓ Balance-diff swap verification pattern
✓ Chainlink oracle price impact validation
✓ Static call simulation for slippage estimation
✓ Configurable staleness thresholds per oracle
✓ Works with fee-on-transfer tokens
✓ 12 custom errors with descriptive parameters
✓ PriceLib — reusable calculation library
✓ Comprehensive fuzz tests + gas benchmarks

slippage-guard.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

/// @title Slippage Guard
/// @notice Pre-trade simulation + slippage protection module.
contract SlippageGuard {
    address public immutable owner;
    uint256 public constant VERSION = 1;

    event Initialized(address indexed deployer);

    constructor() {
        owner = msg.sender;
        emit Initialized(msg.sender);
    }

    // ... full implementation in purchased package
}