Ethereum: Transaction got reverted Uniswap Universal Router

Ethereum Transaction Reverts: Debugging Uniswap Universal Router Issues

As a developer using the Ethereum blockchain, you’re likely familiar with the Uniswap Universal Router (UR). This powerful tool allows for seamless and secure swapping of tokens on the Ethereum network. However, when it comes to executing transactions, issues can arise. In this article, we’ll explore why your transactions are getting reverted and provide a step-by-step guide to debugging and resolving these problems.

Why are transactions being reverted?

Before diving into the solution, let’s understand why transactions might be being reverted:

• Insufficient gas

  : Ethereum has a strict gas limit (the maximum amount of gas available for transactions). If your token swap involves too many tokens or large gas values, it may not have enough “gas” to complete successfully.

• Incorrect contract invocation: When using the Uniswap Universal Router, you need to invoke the swap contract with specific parameters. Inaccurate or missing information can lead to reverts.

• Token balances and amounts: Ensure that all token balances and amounts are accurate and comply with the required gas values for the swap.

Debugging steps to resolve issues

To troubleshoot and resolve reverted transactions using Uniswap Universal Router, follow these steps:

1. Verify contract invocation

• Check if you’re invoking the correct contract function (uniswap_v3.Reroute) and passing the required arguments (token amounts).

• Use a gas calculator or a tool like Etherscan to estimate the gas requirements for your swap.

Example:

const { ethers } = require('ethers');

const uniswapV3Router = new ethers.Contract('0x...'); // Replace with the contract address


// Invoke the swap function with correct arguments

try {

    const tokenAmounts = [...]; // Initialize token amounts array

    const gasPrice = await uniswapV3Router.gasPrice();

    const response = await uniswapV3Router.reroute(tokenAmounts, 0x...); // Replace with your swap function call

} catch (error) {

    console.error(error);

}

2. Check token balances and amounts

• Verify that all token balances are accurate and compliant with the required gas values.

• Ensure that the amount of each token being swapped is sufficient.

Example:

const balanceOf = await uniswapV3Router.getBalance('token1');

if (balanceOf < 100) { // Adjust this value to your needs

    throw new Error('Not enough tokens for swap');

}

3. Verify contract permissions

• Ensure that the Uniswap Universal Router has the necessary permission to access and use the target token.

Example:

const router = new ethers.Contract('0x...'); // Replace with the contract address

if (!router.hasPermission(tokenAmounts)) {

    throw new Error('Insufficient permission');

}

4. Test with a small amount of tokens

• Begin by swapping two or three tokens to ensure the transaction is successful.

• Gradually increase the amount of tokens being swapped to observe any issues that arise.

Example:

const tokenAmounts = [100, 200, 300];

try {

    // Swap the tokens using Uniswap Universal Router

} catch (error) {

    console.error(error);

}

Conclusion

To successfully swap tokens using Uniswap Universal Router, you must be thorough in your testing and debugging process. By following these steps, you’ll be able to identify and resolve issues that may cause reverted transactions.

Remember to:

• Verify contract invocation and gas requirements

• Check token balances and amounts

• Test with a small amount of tokens before increasing the swap size

By applying these best practices, you can ensure reliable and efficient swaps on the Ethereum network using Uniswap Universal Router.

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