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Uniswap V2 Swap Extension for Scaffold-ETH 2

This Scaffold-ETH-2 extension enables users to swap tokens using Uniswap V2.
It leverages the Uniswap V2 SDK to manage token swaps, offering a simple and intuitive user interface for performing token exchange transactions.

🏗 Installation

npx create-eth@latest -e moltam89/uniswap-v2-swap

🚀 Setup extension

For local testing, you'll need to set up a forking URL. This requires an API URL from a provider like Alchemy or Infura to simulate a mainnet environment.

Hardhat: In packages/hardhat/.env, add your forking URL as follows: FORKING_URL=https://eth-mainnet.g.alchemy.com/v2/{your_api_key}
Foundry: In packages/foundry/Makefile, replace ${FORK_URL} with your API URL: anvil --fork-url FORKING_URL=https://eth-mainnet.g.alchemy.com/v2/{your_api_key} --chain-id 31337.

yarn fork

This command creates a local fork of the mainnet, allowing you to work with a simulated environment where Uniswap V2 is already deployed. Running yarn fork allows you to interact with the Uniswap contracts directly in a development environment, testing your token swaps with real mainnet data without the need to spend actual funds. This is especially useful for testing and debugging.

yarn start

Visit your app on: http://localhost:3000. You can swap tokens on the Uniswap page.

🛠️ Configuration

🛰️ Networks

You can configure the network settings in packages/nextjs/scaffold.config.ts. By default, the target network is set to either [chains.hardhat] or [chains.foundry].

If you want to configure multiple networks, it can be set like this:
targetNetworks: [chains.hardhat, chains.mainnet, chains.arbitrum, chains.base, chains.optimism, chains.polygon]

🪙 Tokens

You can configure the available tokens for swapping in the packages/nextjs/app/uniswap/_helpers/tokens.ts file. Here, you can set the token addresses, names, and decimals for each supported network. By default, DAI and USDC are configured. Here’s an example configuration to include the OP token on the Optimism network:

[optimism.id]: {
    [WETH9[optimism.id].address]: { name: "ETH", decimals: 18 },
    "0xDA10009cBd5D07dd0CeCc66161FC93D7c9000da1": { name: "DAI", decimals: 18 },
    "0x0b2C639c533813f4Aa9D7837CAf62653d097Ff85": { name: "USDC", decimals: 6 },
    "0x4200000000000000000000000000000000000042": { name: "OP", decimals: 18 },
  },
UniswapV2Extension.mov