Subway Sandwich Contracts

Uses dapp.tools

Overview

This is a set highly optimized contracts that can be used front and back slices in a UniswapV2 sandwich attack.

For a sandwich front/back slice, there is only so much optimization that can be done on your contracts. This repository currently includes:

• Avoid using SLOAD for owner checking
• Compact payload construction
• Manual memory pointer construction
• Catch-all function signatures
• ....

NOTE: Please be aware that this repository does NOT provide protection against Uncle Bandit attacks

Gas Usage

Single Swap	Gas Used
Univ2 Router	109809
Solidity Inline Assembly Contract	92422
Yulp Contracts	92234

Development

You'll need NodeJS on your machine.

Yul+ contracts are first compiled via the JS compiler, then relayed to Dapptool's HEVM via FFI. That way we can use Dapptool's testing suite alongside with Yul+.

Running the tests

# clone the repository, enter contracts directory
git clone https://github.com/libevm/subway.git
cd subway/contracts

# install dependencies (for yulp and ffi support)
yarn

# run the tests (requires a Ethereum Node)
# use Infura as last resort
dapp test --rpc-url $RPC_URL --verbosity 2 --ffi