Metamask: MetaMask incorrectly estimates 100,000 gas for ERC20 transfer. Why?

ileegetarmas

Metamask: MetaMask incorrectly estimates 100,000 gas for ERC20 transfer. Why?

Understanding MetaMask’s Gas Limit Estimation for ERC20 Transfers

MetaMask, the popular Ethereum browser extension and dApp platform, relies on its API to facilitate transactions on the Ethereum blockchain. One of these APIs is the erc20.transfer() method, which enables users to transfer ERC-20 tokens (e.g., DAI, USDC) between wallets or contract addresses. However, in some cases, MetaMask may incorrectly estimate the gas cost for an ERC20 transfer, leading to incorrect transaction processing.

In this article, we will delve into why MetaMask limits the gas limit estimate to 100,000 and provide insight into the complexities of erc20.transfer() that contribute to these errors.

Why does MetaMask limit ERC20 .transfer() to 100,000?

The reason behind MetaMask’s estimated gas limit for erc20.transfer() is a combination of factors:

• Gas estimation algorithm: MetaMask uses an algorithm from the Ethereum Gas Estimator (EGE) library, which estimates gas costs based on various factors such as network congestion, transaction complexity, and available gas in the network.

• Gas price fluctuations

  

  : Gas prices can fluctuate over time due to changes in network congestion, miners’ behavior, or other market factors. As a result, MetaMask may adjust its estimated gas limit upward to account for these price increases.

• Transaction complexity: erc20.transfer() involves multiple transactions (e.g., creating a new contract call and sending tokens), which can increase the transaction complexity. To accommodate this complexity, MetaMask may assume that the overall gas cost will be higher than the sum of individual transaction costs.

The correct estimated gas limit for ERC20 transfers

In contrast to its incorrect estimate of 100,000 gas, the actual gas cost for an erc20.transfer() transaction can range from around 145,000 to over 300,000 gas units. This is because MetaMask’s algorithm takes into account the additional complexities involved in transferring tokens across multiple contracts.

Why does this matter?

Incorrectly estimating gas limits can lead to several issues, including:

• Transaction failure: If a user attempts to transfer tokens that exceed their estimated gas limit, the transaction will fail, and they may not receive their funds.

• Delayed or missed transactions: In some cases, MetaMask’s algorithm may estimate a high gas cost, but the actual gas required for the transaction is lower. This can lead to delayed or missed transactions, which can have significant consequences on the user’s experience.

Conclusion

MetaMask’s estimated gas limit of 100,000 for erc20.transfer() is incorrect due to its reliance on an algorithm that takes into account factors such as network congestion and gas price fluctuations. To avoid these errors, users should always check their transaction details after execution to ensure that the actual gas cost matches their estimated value.

By understanding how MetaMask estimates gas limits and recognizing the complexities involved in `erc20.transfer() transactions, users can take steps to mitigate these issues and ensure a smooth user experience on the Ethereum blockchain.