Metamask: Revert execution: ERC20: Transfer amount exceeds limit Code: UNPREDICTABLE_GAS_LIMIT method

Metamask: Execution Cancellation in Hardhat with Uncertainty

As a developer building decentralized applications (dApps) using smart contracts, you probably know the importance of ensuring secure and reliable interactions between your application and external services. However, unexpected issues can sometimes arise when interacting with external swap functions, leading to execution cancellation.

In this article, we will delve into the specifics of the issue and provide guidance on how to resolve it using a combination of Metamask and Hardhat’s TypeScript configuration.

ERC20 Transfer Amount Exceeding Allocation

The first step in troubleshooting is to understand the underlying cause of the error. The message “Execution Cancellation: ERC20: Transfer Amount Exceeding Allocation” indicates that the external Swap function rejected your request due to insufficient allocation or transfer amount. This can happen when:

• The recipient’s wallet does not have enough Ether (ETH) in its balance.

• The transaction amount is larger than the recipient can afford.

• There are issues with the token’s “allocation” property or the “transfer” function being called.

Metamask: Canceling execution

To cancel execution and fix this issue, you will need to modify your contract logic to handle cases where transfer amounts exceed allocations. One approach is to use Metamask’s built-in support for specifying gas limits in exchange functions.

Here is an example of how you could modify your contract:

import { ethers } from 'ethers';
const MAX_TRANSFER_AMOUNT = 1 0000000; // ETH
export async function swap(amount: number) {
const allocation = await contract allocations.call();
if (allocation.value < MAX_TRANSFER_AMOUNT) {
console.log('Execution canceled due to insufficient allocation:', amount);
return;
}
const gasLimit = await contract.getAllowanceGasLimit();
if (gasLimit.value <= 20000) { // Hardcode the gas limit
throw new Error('Gas limit is too low');
}
try {
const tx = await contract.swap(amount, allocation.value - amount);
console.log('Swap transaction executed successfully:', tx.hash);
// ... Rest of your swap function code ...
} catch (error) {
if (error instanceof ethers.AgreedError || error.status === 0x80000000) { // Execution canceled
console.log('Execution canceled due to gas limit issue:', error.message);
throwing error;
}
}
}
export async function main() {
await contract.deploy();
}

In this example, we check if the allocation value is less than “MAX_TRANSFER_AMOUNT” before calling the “swap” function. Otherwise, we cancel the execution and log a message.

Hardhat Configuration

To enable gas limit support in your Hardhat configuration, you can use the following TypeScript snippet:

import { HardhatRuntimeEnvironment } from 'hardhat-typescript';
import { Web3Provider } from '@metamask/web3-provider';
export default function configuration ({ network }) {
return {
// ... other configuration settings ...
gasLimit: 20000, // Gas limit for swap function
};
}

Conclusion

By understanding the underlying cause of the “execution canceled” error and implementing a solution that handles transfer amounts exceeding permissions using Metamask’s built-in support for specifying gas limits in exchange functions, you can ensure secure and reliable interactions between your application and external services. Always prioritize testing and debugging to prevent issues from occurring.

If you encounter persistent errors or need additional assistance, consider reaching out to the Ethereum community or seeking advice from experienced developers on your network.