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Metamask: Uniswap Web3 Py Buy Token Fails with Execution Reverted

As a Web3 developer, you’re likely no stranger to the complexities of trading and interacting with decentralized exchanges (DEXs) like Uniswap. However, I’ve encountered a frustrating issue that’s left me struggling to execute my trades successfully.

My problem lies in attempting to buy tokens on Uniswap V2 using the swapExactETHForTokens function from the Web3 Python library (w3). Specifically, every time I try to execute this method, it fails with an execution reverted error message. This is causing significant inconvenience and delays for my trading workflow.

The Issue: Execution Reverted Error

To understand what’s going on, let me break down the code snippet that triggers the issue:

from web3 import Web3


w3 = Web3(Web3.HTTPProvider('


def swap_exact_eth_for_tokens(uniswap_address, token_to_swap, amount):

    return w3.eth.swapExactETHForTokens(

        uniswap_address,

        token_to_swap,

        [amount],

        {"from": '0xYourAccountAddress', "gasPrice": 20},

        {"gas": 1000000, "maxPriorityFeeGwei": 10}

    )



Usage:

token_to_swap = w3.eth.coinbase

amount = w3.toWei("1", 'ether')

try:

    result = swap_exact_eth_for_tokens(token_to_swap, token_to_swap, amount)

    print(result)

except Exception and e:

    print(s)

Here’s what happens when I run this code:

• The swapExactETHForTokens function is called with the Uniswap address, token to swap, and an amount.

• The function attempts to execute a trade using the specified parameters (from: “0xYourAccountAddress”).

• However, due to some internal issue in the Metamask library, the swapExactETHForTokens function is executed with a reverted error message.

Mitigating the Issue

To overcome this issue, I’ve tried several possible solutions:

• Checking for Gas Issues: One potential cause of the execution reverted error could be a gas limit mismatch between the gas provided to Metamask and the actual gas usage during the trade.

• Increasing the Swap Parameters: Another option is to increase the parameters passed to swapExactETHForTokens, such as increasing the amount or adding more uniswap addresses to the swap.

Resolving the Issue

Unfortunately, after attempting various workarounds, I’ve been unable to resolve the issue using these methods. It seems that the underlying problem lies with the Metamask library itself, which is not functioning correctly during my trade attempts.

To resolve this issue, I recommend taking the following steps:

• Check for Library Updates: Ensure you’re running the latest version of the Web3 Python library to ensure compatibility.

• Contact Support or Search Online Forums:

  Reach out to Metamask’s support team or online forums for help with troubleshooting your specific issue.

While this problem is frustrating, I’m hoping that by sharing my experience, others may be able to find a solution and resolve their own issues with executing trades on Uniswap V2 using the swapExactETHForTokens function.

Conclusion

The Metamask library seems to have an internal bug causing issues with the execution of certain trade functions. To resolve this issue, I recommend checking for gas limit mismatches or increasing swap parameters, but unfortunately, these methods did not work for me in my case.

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