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Uniswap Arbitrage Flash Swap

Uniswap Arbitrage Flash Swap is an open-source set of Solidity contracts for checking and executing flash-swap arbitrage between decentralized exchanges, with callbacks for common DEXs and a JavaScript watcher workflow that operators must configure and support with their own infrastructure.

Explore the practical guide ↓

Independent OpenViST project profile, based on linked sources.

Uniswap Arbitrage Flash Swap — 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 as a contract and workflow base when you can build and operate the supporting infrastructure needed to monitor block activity and submit transactions promptly.

Who it is for

  • Developers building custom DEX arbitrage systems with Solidity and JavaScript.
  • Operators prepared to provide chain-provider connectivity, monitoring and transaction-submission infrastructure.

Documented uses

  • Check a potential arbitrage between source and target DEX routers.
  • Start a flash-swap arbitrage transaction through the contract.
  • Monitor new blocks and check opportunities using the documented watcher workflow.
  • Extend callback support for a DEX integration.
Before you choose

Requirements & limits

The repository is public and identifies an MIT license.

  • The repository explicitly says it is not a full project and requires surrounding infrastructure.
  • The README documents a read-only check function and a separate transaction-start function.
  • The watcher workflow uses a WebSocket connection to listen for new blocks.
  • Callbacks are supplied for common DEXs, with extensions left to the developer.

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 and start the JavaScript watcher

Prepare the documented watcher workflow by filling its environment file and starting watcher.js.

Before you start

  • The repository and its environment template
  • A deployed arbitrage contract
  • Configured chain-provider details, including a WebSocket connection for new blocks

Steps

  1. Copy env.template to .env.

  2. Replace the values in .env with the required configuration.

  3. Run node watcher.js.

Expected outcome

The watcher starts with the configured wallet and provider connection and can check arbitrage opportunities as shown in the README workflow.

Guide limitations

  • The README says this is not a full project and requires surrounding infrastructure.
  • The documented workflow does not establish that a particular provider, configuration or transaction will succeed.
Documentation 1 ↗
Evidence and transparency

Sources & review

Official repository ↗
Source record details
Source availability
Active
Sources checked
16 October 2026
Original website title
Haehnchen/uniswap-arbitrage-flash-swap · Official homepage title · retained in its source language
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