Solidity Pseudocode for DEX-2-DEX automated, fast execution Arbitrage trader.

dex-to-dex.sol

// DEX-2-DEX only
// A pseudocode of my automated solidity code to execute fast Arb trade.
// I would be using Uniswap and PancakeSwap DEXs
// 1 ETH = 3,234 USDT (Uniswap)
// 1 ETH = 3,334 USDT (PancakeSwap)
function executeArbitrage( address tokenA, address tokenB, uint amountIn, address dex1, address dex2) external {
    uint256 feeDex1 = Dex1(dex1).getTradingFee(tokenA, tokenB);
    uint256 feeDex2 = Dex2(dex2).getTradingFee(tokenB, tokenA);

    // bid 1 ETH = 3,234 USDT (Uniswap)
    uint256 amountOutDex1 = Dex1(dex1).swap(tokenA, tokenB, amountIn);
    uint256 amountOutAfterFeeDex1 = amountOutDex1 - (amountOutDex1 * feeDex1 / 10000);

    // ask 1 ETH = 3,334 USDT (PancakeSwap)
    uint256 amountOutDex2 = Dex2(dex2).swap(tokenB, tokenA, amountOutAfterFeeDex1);
    uint256 amountOutAfterFeeDex2 = amountOutDex2 - (amountOutDex2 * feeDex2 / 10000);

    uint256 gasCost = tx.gasprice * gasleft();
    require(amountOutAfterFeeDex2 > (amountIn + gasCost), "no realized profit");
    uint256 profitForCaller = amountOutAfterFeeDex2 - (amountIn + gasCost);
    ERC20(tokenA).transfer(msg.sender, profitForCaller);
}