This JavaScript SDK is thin wrapper of MegaFuel clients, offering a streamlined interface to interact with the MegaFuel. For more information, please refer to the API documentation.
- Install dependency
$ npm install megafuel-js-sdk- Example
import 'dotenv/config';
import {ethers} from "ethers";
import {PaymasterClient, SponsorClient, WhitelistType} from 'megafuel-js-sdk';
const PAYMASTER_URL = "https://bsc-megafuel.nodereal.io"
const SPONSOR_URL = "https://open-platform-ap.nodereal.io/{YOUR_API_KEY}/megafuel"
const POLICY_UUID = "a2381160-xxxx-xxxx-xxxxceca86556834"
const TOKEN_CONTRACT_ADDRESS = "0xeD2.....12Ee"
const RECIPIENT_ADDRESS = "0x8e9......3EA2"
const YOUR_PRIVATE_KEY = "69......929"
const paymasterClient = new PaymasterClient(PAYMASTER_URL);
const network = await paymasterClient.getNetwork();
const sponsorClient = new SponsorClient(SPONSOR_URL, null, {staticNetwork: ethers.Network.from(Number(network.chainId))});
try {
// sponsor the tx that interact with the stable coin ERC20 contract
const res = await sponsorClient.addToWhitelist({
PolicyUUID: POLICY_UUID,
WhitelistType: WhitelistType.ToAccountWhitelist,
Values: [RECIPIENT_ADDRESS]
});
console.log("Added ERC20 contract address to whitelist ", res);
} catch (error) {
console.error("Error:", error)
}
const wallet = new ethers.Wallet(YOUR_PRIVATE_KEY);
const tokenAbi = ["function transfer(address,uint256) returns (bool)"]; // ERC20 token ABI (only including the transfer function)
const tokenContract = new ethers.Contract(TOKEN_CONTRACT_ADDRESS, tokenAbi, wallet); // Create contract instance
// Get the current nonce for the sender's address
const nonce = await paymasterClient.getTransactionCount(wallet.address, 'pending');
const tokenAmount = ethers.parseUnits('1.0', 18); // Amount of tokens to send (adjust decimals as needed)
const transaction = await tokenContract.transfer.populateTransaction(RECIPIENT_ADDRESS, tokenAmount);
// Add nonce and gas settings
transaction.from = wallet.address;
transaction.nonce = nonce;
transaction.gasLimit = 100000; // Adjust gas limit as needed for token transfers
transaction.chainId = network.chainId;
transaction.gasPrice = 0; // Set gas price to 0
try {
const sponsorableInfo = await paymasterClient.isSponsorable(transaction);
console.log('Sponsorable Information:', sponsorableInfo);
} catch (error) {
console.error('Error checking sponsorable status:', error);
}
try {
// Sign the transaction
const signedTx = await wallet.signTransaction(transaction);
// Send the raw transaction using the sending provider
const tx = await paymasterClient.sendRawTransaction(signedTx);
console.log('Transaction sent:', tx);
} catch (error) {
console.error('Error sending transaction:', error);
}More examples can be found in the examples.