Elyx0 Elyx0

Deconstructing a $2.5M CEX-DEX Arbitrage Bot

Atomic MEV is becoming tougher in recent years as competition intensifies and more skilled teams enter the game. To stay competitive, teams integrate more exchanges and capture untouched arbitrage paths and order flow which is not always trivial, especially when dealing with cross-chain MEV or any non atomic arbitrage.

One common arbitrage is CEX-DEX arbitrage. I've noticed many on-chain bots but never dug deep into their performance until now.

I'll be looking at the bot 0x98C3d3183C4b8A650614ad179A1a98be0a8d6B8E, specifically the transaction 0x6f94aa47e74de8897979fdc3b6e541bb515be9c72f2a912cd548f98e2c11729a

Investigating the Trade

This token is listed on many exchanges, I'll focus on Bina

Using LEB128 encoding scheme for custom abi/interface.

ERC-138128: Custom function selector and calldata encoding scheme declaration standard

A contract SHOULD use ERC-165 standard to declare its support for ERC-138128 standard.
A contract supporting ERC-138128 MUST have these two view functions: customSelectors() and customEncodings().

`customSelectors()`

This function is used to declare alternative function selectors for any number of standard function signatures. This function MUST have the following interface.

11-rekt

Contract names: Eleven.finance, Nerve Finance, NRV vault, Eleven "MasterMind" farming contract
Contract hex addresses: Not mentioned in the article
Bug types mentioned in the article:
1. Vulnerable function (emergencyBurn()) in the intermediate vault contract
2. Flashloan exploit
3. Logic issue
4. Unauthorized withdrawal

	// Provide database URL and database name where specified
	// Provide file location for your function


	const express = require("express");
	const admin = require("firebase-admin");
	const functions = require("firebase-functions/v2");
	const cron = require("node-cron");
	const app = express();

	You are Manus, an AI agent created by the Manus team.

	You excel at the following tasks:
	1. Information gathering, fact-checking, and documentation
	2. Data processing, analysis, and visualization
	3. Writing multi-chapter articles and in-depth research reports
	4. Creating websites, applications, and tools
	5. Using programming to solve various problems beyond development
	6. Various tasks that can be accomplished using computers and the internet


	╭────────────────────────────────────────────╮
	│ ✻ Welcome to Claude Code research preview! │
	│ │
	│ /help for help │
	│ │
	│ cwd: /Users/v/vic/dev/IC │
	╰────────────────────────────────────────────╯

	! cat InteractionCalculus.md

	## canmore

	// # The `canmore` tool creates and updates text documents that render to the user on a space next to the conversation (referred to as the "canvas").

	// Lean towards NOT using `canmore` if the content can be effectively presented in the conversation. Creating content with `canmore` can be unsettling for users as it changes the UI.

	// ## How to use `canmore`:

	// - To create a new document, use the `create_textdoc` function. Use this function when the user asks for anything that should produce a new document. Also use this when deriving a new document from an existing one.

	// See Mesc Reference for setup: https://github.com/paradigmxyz/mesc/tree/main/cli#reference

	contract TestSetup is Test {

	function fetchRpcUrlFromMesc(string memory networkName) internal returns (string memory url) {
	string[] memory inputs = new string[](3);
	inputs[0] = "mesc";
	inputs[1] = "url";
	inputs[2] = networkName;

	// SPDX-License-Identifier: GPL-3.0
	pragma solidity ^0.8.0;

	import "hardhat/console.sol";

	contract TryCatchCaller {
	TryCatchCallee calee;

	constructor () {
	calee = new TryCatchCallee();

	"use strict";

	const defaultOptions = {
	reverse: true,
	python: false
	}

	function merge(sequences) {
	let result = [];
	sequences = sequences.map(s => s.slice());