snakewarhead/token-utils

token-utils

uniswap

formula

$$ r_i \cdot r_o = K $$

$r_i \cdot r_o = (r_i + a_i) \cdot (r_o - a_o)$

expands to find $a_o$

$a_o = \frac{a_i \cdot r_o}{r_i + a_i}$

the fee of uniswap is 0.3%, so $a_i = a_i^` \cdot 0.997$

function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) internal pure returns (uint amountOut) {
    require(amountIn > 0, 'UniswapV2Library: INSUFFICIENT_INPUT_AMOUNT');
    require(reserveIn > 0 && reserveOut > 0, 'UniswapV2Library: INSUFFICIENT_LIQUIDITY');
    uint amountInWithFee = amountIn.mul(997);
    uint numerator = amountInWithFee.mul(reserveOut);
    uint denominator = reserveIn.mul(1000).add(amountInWithFee);
    amountOut = numerator / denominator;
}

that is:

$a_o = \frac{a_i \cdot 997 \cdot r_o}{r_i \cdot 1000 + a_i \cdot 997}$

eventToken

transfer event

npx hardhat eventToken --t tokenAddress --b 18955400 --s 0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef --p aaa,bbb;ccc --network inconfig

mevLike

todo

• mempool

  • listen the mev address, i.e. from address

    • check buy
    • check sell

  • listen the token address(i.e. to address)

    • check any operate to the contract of token
    • no check
      • approve
      • transfer
      • transferFrom

  • I must be on the alert if I bought, I will sell as soon as possible

    • the token address must be sent to the mempool that monitor it
    • sell command must be sent to the sell task
    • use sync message to the pulsar mq

• pulsar mq

• decouple the logic tasks

  • a buy task
  • a sell task

config

• create mongodb index

idx_hashTransaction idx_blockNumber

process

• target

• buy

  • when
  • which token
  • how
    • check safety
    • how many amounts

• sell in v2

  • when

    • mev sell

    • removeLiquidity removeLiquidityWithPermit etc of router

      • check token address

    • contract token that be called to any method

      • not approve
      • not transfer