vxg20 / subway

A practical example on how to perform sandwich attacks on Ethereum

Subway

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

Overview

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.