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Gas Estimation Error When Programmatically Sending ERC 20 Tokens with Disperse
Ethereum smart contracts have become an essential part of any blockchain development project. However, a common issue that can arise when implementing and running smart contract programs is gas estimation error, which can result from sending large amounts of data to the Ethereum network.
In this article, we will discuss how to estimate the gas cost of implementing a smart contract using Disperse, a popular decentralized application (dApp) platform for Ethereum-based applications. Specifically, we will focus on a common scenario where multiple ERC 20 tokens are sent to different wallets programmatically.
Gas Estimation Error
When sending data to the Ethereum network, such as sending ERC 20 tokens from one wallet to multiple other wallets, the gas estimation error can occur for several reasons:
- Token Quantity
: The number of tokens sent and received exceeds the available storage space in each recipient’s wallet.
- Gas Prices: Gas prices are higher than the current market rate, causing the transaction to consume more gas than necessary.
Disperse Solution: Estimated Gas Cost
To estimate the gas cost of implementing a smart contract using Disperse, we can use their “gasEstimator” function, which provides an estimated gas cost for implementing and calling a given function. In our case, we will use it to estimate the gas cost of sending ERC 20 tokens from one wallet to multiple other wallets.
Code snippet
Here is an example code snippet that demonstrates how to use Disperse’s “gasEstimator” function:
“solidity
solidity pragma ^0.8.0;
contract MySmartContract {
// Function to send ERC 20 tokens to multiple wallets
function transferTokensToMulti(address[] memory recipients) public {
GasEstimator(
"transferTokensToMulti",
"MySmartContract",
"myToken",
(address(_recipient), uint256(_amount)) => _recipient,
_gas, // Gas estimate requested for function
_maxGas // Maximum allowed gas cost per transaction
).result(
"transferred",
true, // success flag
"_success", // result message
_gasCost // estimated gas cost in wei
);
// Transfer tokens to each recipient
for (uint256 i = 0; i < recipients.length; i++) {
transferTokens(_tokenAddress, recipients[i], _amount);
}
}
// Function to send ERC 20 tokens from one wallet to multiple other wallets
function transferTokens(source address, destination address, uint256 amount) internal {
// Calculate the gas cost for the transfer operation
uint256 gasCost = calculateGasCost(source, destination, amount);
// Transfer tokens using Disperse'stransferfunction
Result TransferResult = disperseTransfer(source, destination, amount);
require(result.status == 0x00, "Transfer failed");
}
// Function to estimate the gas cost of implementing a smart contract using Disperse
function calculateGasCost(sourceaddress, destinationaddress, amount uint256) internal returns (uint256) {
// Call thegasEstimator` function from Disperse
return gasEstimator(
“transferTokensToMulti”,
“MySmartContract”,
“myToken”,
(address(_recipient), uint256(_amount)) => _recipient,
0, // Gas estimate required for implementing the smart contract
2000000 // Maximum allowed gas cost per function call
).