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Flash Arb Bot

Flash Arb Bot is a JavaScript and Solidity implementation of Aave V3 flash-loan arbitrage on Arbitrum. A Node.js scanner checks DEX prices and estimates returns after fees and gas; a smart contract borrows a token and swaps it across two exchanges in one atomic transaction, repaying the loan and fee before forwarding qualifying surplus to the contract owner.

Explore the practical guide ↓

Independent OpenViST project profile, based on linked sources.

Flash Arb Bot — OpenViST project profile in DeFi.
OpenViST project illustration. See the linked sources for product details.
Understand the project

Practical overview

When it fits

Use it to inspect or configure a scheduled Arbitrum arbitrage workflow when you can manage RPC settings, protocol addresses, GitHub Actions secrets, wallet security, and transaction gas.

Who it is for

  • Developers examining an open-source Arbitrum flash-loan arbitrage implementation
  • Experienced DeFi users configuring scheduled DEX price scans and transaction attempts
  • Readers studying how off-chain opportunity screening can work alongside on-chain transaction conditions

Documented uses

  • Scan configured exchange routes and estimate potential profit after fees and gas.
  • Run opportunity checks on a schedule through GitHub Actions.
  • Submit a qualifying two-exchange swap using an Aave V3 flash loan.
  • Log potential opportunities without trading by keeping DRY_RUN enabled.
Before you choose

Requirements & limits

The implementation is available as a public GitHub repository under the MIT license. The README describes scheduled execution through GitHub Actions and a default dry-run setting.

  • The implementation combines a Node.js price scanner with a Solidity executor that uses Aave V3 flash loans.
  • The documented DEX flow swaps across two exchanges in one atomic transaction; the README names Uniswap and SushiSwap and also describes a V2-style alternative route.
  • An on-chain minimum-profit condition reverts trades that do not cover repayment and configured profit, but gas for an attempted transaction can still be lost.
  • The README says DRY_RUN defaults to true, so scans and logs do not send transactions until explicitly changed.
  • Live configuration requires current protocol addresses, RPC access, GitHub secrets, a wallet key, and ETH for gas.

Check current requirements in the official documentation. Source-based guidance does not mean OpenViST has run or independently tested this project.

Source-based practical guide

Configure a dry-run scan with GitHub Actions

Set up the documented scan configuration while keeping transaction submission disabled.

Before you start

  • A GitHub account and access to the repository's Actions settings
  • An Arbitrum RPC URL from a provider such as Alchemy or Infura
  • Values for the scan configuration, including PAIRS_CONFIG_JSON
  • DRY_RUN set to true

Steps

  1. Create an Arbitrum One application with an RPC provider and copy its HTTPS RPC URL.

  2. In the repository, add ARBITRUM_RPC_URL, DRY_RUN=true, and the scan configuration secrets described in .env.example.

  3. Use the documented scheduled GitHub Actions workflow to run the scanner in dry-run mode.

Expected outcome

The bot scans and logs opportunities and estimated profit without sending a transaction.

Guide limitations

  • Dry-run mode does not execute trades.
  • Live transaction submission would require further configuration and ETH for gas.
Documentation 1 ↗
Evidence and transparency

Sources & review

Official repository ↗
Source record details
Source availability
Active
Sources checked
10 October 2026
Original website title
manuelinfosec/flash-arb-bot · Official homepage title · retained in its source language
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