Metamask: Getting execution reverted: ERC20: transfer amount exceeds allowance code: UNPREDICTABLE_GAS_LIMIT method
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Metamask: Hardhat Execution Recovery with Uncertainty
As a developer building decentralized applications (dApps) using smart contracts, you probably know how important it is to ensure secure and reliable interactions between your application and external services. However, sometimes, when interacting with external exchanges, unexpected issues can arise that cause execution to be canceled.
In this article, we will delve into the details of the issue and provide instructions on how to resolve it using a combination of Metamask and Hardhat TypeScript configuration.
ERC20 Transfer Amount Exceeds Limit
The first step in troubleshooting is to understand the cause of the error. The message “Execution Recovered: ERC20: Transfer Amount Exceeds Limit” means that the external exchange rejected your request due to insufficient limit or transfer amount. This can happen if:
- The recipient’s wallet does not have enough Ether (ETH).
- The transaction amount is larger than the recipient can afford.
- There is a problem with the ‘allowance’ property of the authorization or the ‘transfer’ function call.
Metamask: undoing
To undo and resolve this issue, you need to change your contract logic to handle cases where transfer amounts exceed the limits. One way is to use Metamask’s built-in support for setting gas limits in exchange functions.
Here is an example of how you can change your contract:
import {ethers} from 'ethers';
const MAX_TRANSFER_AMOUNT = 10000000; // ETH
export async function swap(amount: number) {
const allowance = await contract allowances.call();
if (allowance.value < MAX_TRANSFER_AMOUNT) {
console.log('Cancellation due to insufficient limit:', amount);
return;
}
const gasLimit = await contract.getAllowanceGasLimit();
if (gasLimit.value <= 20000) { // Tightly code the gas limit
throw new Error('Gas limit too low');
}
try {
const tx = await contract.swap(amount, allowance.value - amount);
console.log('Swap completed successfully:', tx.hash);
// ... The rest of the swap code ...
} catch (error) {
if (error instanceof ethers.AgreedError || error.status === 0x80000000) { // Execution canceled
console.log('Execution canceled due to gas limit issue:', error.message);
throw error;
}
}
}
export async function main() {
await contract.deploy();
}
In this example, we check if the limit is less than “MAX_TRANSFER_AMOUNT” before calling the “swap” function. If not, we cancel and log a message.
Hardhat Configuration
To enable gas limit support in your Hardhat configuration, you can use this TypeScript snippet:
import { HardhatRuntimeEnvironment } from 'hardhat-typescript';
import { Web3Provider } from '@metamask/web3-provider';
export default function config({ network }) {
return {
// ... other configuration settings ...
gasLimit: 20000, // Gas limit for the swap function
};
}
Application
Understanding the root cause of the “execution returned” error and implementing a solution that handles transfer amounts that exceed limits, using Metamask’s built-in support for setting gas limits in exchange functions, can help 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 guidance from experienced developers in your network.
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