A practical example on how to perform sandwich attacks on UniswapV2 pairs.
Having highly optimized contracts is just one part of the equation, a tech stack is just as important as the contracts to execute on the opportunities.
subwap-usage.mp4
The contracts are written in Yul+ and Solidity, and contains the bare minimum needed to perform a sandwich attack (i.e. swap and transfer). They do NOT protect against uncle bandit attacks so use at your own risk.
The goal of this bot is to act as a low barrier of entry, reference source code for aspiring new searchers (hence, JavaScript). This bot contains:
- read from the mempool
- decode transaction data
- simple logging system
- profit calculation algos
- gas bribe calculation
- bundle firing
- misc
- doing math in JS
- calculating next base fee
While the bot is functional, the bot logic is a very simplistic one and does not contain a lot of the features that many advance searchers have (but not including), such as:
- circuit breakers
- poison token checker
- caching system
- robust logging system (e.g. graphana)
- various gas saving ALPHAs
As such, this bot is intended as a piece of educational content, and not for production use.