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Ethereum: uniswap not working on sepolia network

Published by Terlumun Aondover on February 9th, 2025.

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Ethereum: uniswap not working on Sepolia Testnet

As an Ethereum Developer, You’re Likely No Stranger to the Complexities of Interoperability and Testing Different Networks for Your Projects. However, when it comes to decentralized finance (Defi) protocols like uniswap, issues with cross-chain compatibility can be frustrating.

In this article, we’ll explore a common issue that arises when trying to use uniswap v3 on the sepolia testnet, and provide some insights into troubleshooting and potential solutions.

The issue:

Uniswap V3 Relies on Several Interconnected Contracts, Including uniswapv3router01,uniswapv3pair, and erc20swap. These contracts are used to facilitation swaps between different asset pairs. However, Sepolia’s test network has its own set of rules and modifications that can conflict with thesis contracts.

The Problem:

In a recent development, we’ve encountered issues with unniswap v3 working correctly on the sepolia testnet. Specifically:

The unniswapv3router01 contract is not deployed or configured properly, causing uniswap v3 to fail when attempting to swap assets.

The erc20swap contract has leg modified to include an invalidFromtokenaddress parameter.

The Solution:

To Resolve This Issue, We Recommending The Following Steps:

1.
Deploy and Configure uniswap V3 on Sepolia Testnet

Before attempting to use uniswap v3, Ensure that it is coply deployed and configured on the Sepolia Testnet. This May Involve Creating a New Contract Instance Using Deployer/Uniswapv3router01 'OR Deployer/Uniswapv3pair.





2. 
 Check for conflicting assets 

Verify that the assets Being swapped are not conflicting with each other. Uniswap v3 relies on specific token addresses and asset pairs to function correctly.



3. 
 Update Sepolia's Testnet Rules (If Necessary) 

If you're using a custom testnet setup, ensure that the rules are up-to-date and compatible with unniswap v3. You can refer to the Sepolia Documentation for More Information on updating Their Testnet Rules.



4. 
 Verify Contract Interactions

Double-Check That All Contract Interactions (E.G.,Uniswapswap) are working correctly without any errors or warnings.



 Example code:

Here's an Example of how you might deploy and configure uniswap v3 using thedeployer/uniswapv3router01contract:

Solidity



Pragma Solidity ^0.8.0;

import " contracts/token/erc20/safeerc20.sol";

contract uniswapv3router01 {

    Function _init () Internal virtual {

        // Initialize contract Parameters and Settings

    }

    function swap (

        Address from,

        Address to,

        uint Amountin,

        uint amountoutmin,

        Address [] memory tokens,

        uint8 [] memory child,

        Bytes Memory Data

    ) Public Override {

        // Implement Swap Logic Here Using the Above Parameters

    }

}

Conclusion:

As you can see, implementation uniswap V3 on Sepolia’s test network Requires Careful Attention to Detail and a Thorough Understanding of the Underlying Contracts. By following thesis steps and consulting with the community, you should be able to resolve this issue and get your unniswap v3 setup working correctly on the sepolia testnet.

Additional resources:

For more information on deploying and configuring uniswap V3 on Sepolia’s Testnet, I Recommoning Out the Following Resources: