Toxic ERC20s:

BackdoorToken

• A 3rd-party (central) address set by contract deployer can revert tokens sent to a victim address.

CyanideToken

• Salmonela dupe
• Need to add owner address overrides (which bypass the toxic transfer) once bot contracts are deployed*

StandardToken

• Non-toxic baseline
• Pausible ERC20

Setup

Deploy to Goerli

• *First, enter change token name in deploy.js

npx hardhat run scripts/deployers/deployCyanideToken.js --network goerli

Test

npx hardhat test

• more soon

Scripts

scripts/sample-script.js

Notes on gas

MaxFeePerGas = Base fee + maxPriorityFee.

• MaxFeePerGas = absolute max user is willing to pay on gas
• Base fee = algorithmically determined cost per unit of gas based on how full blocks are.
• maxPriorityFee = tip miners. Minimum tip for your tx to be mined = 1 gwei, or .000000001 eth.
• For non-Flashbots miners, MaxPriorityFee is the tip to miners. Standard Ethereum Miners receive (per block): maxFeePerGas - base fee.

Gas Script (built in to front-end)

• new packages (@ethereumjs/tx and axios) installed - need to npm i
• Calculates gas fees for current block.
• Calculates last 10 blocks baseGasFees, formats to dec, reduces, gets average

EIP1559 Tx

• Just how Dan sends these tx's in the video but we can use other methods

Dan's EIP1559 talk: https://www.chainshot.com/md/eip1559-9-14-21

• EIP Transaction package @ 0:56:40
• Using axios to get eth_feeHistory @ 1:09:56
• ethereumjs docs https://www.npmjs.com/package/@ethereumjs/tx

Sandwich Bot Demo

Monitors mempool for Uniswap V2 buy transactions, performs sandwich on profitable transactions.

Setup

• Add PRIVATE_KEY, GOERLI_WSS_URL variables in .env file
• Fill variables in src/trade_variables.js file

Deploy Contracts

• Add ETHERSCAN_API_KEY in .env file

•  $ npx hardhat run scripts/deployers/deploySandwichBot.js --network goerli
   $ npx hardhat verify --network goerli <Contract address> <WETH address> 
  

• Send ETH to sandwich contract to wrap to WETH

Usage

• $ npx hardhat run scripts/sandV2.js --network goerli