Sponsor Transactions

Using this API call we sponsor a transactions.

To sponsor a transaction, you need to whitelist the address beforehand.

import { utils } from 'ethers';
import 'dotenv/config';
import { NetworkNames, initializeSdkGateway } from '@kanalabs/mirai';
import { sleep } from '@etherspot/prime-sdk/dist/sdk/common';

const receiverAddress = '0x97a57d9CE2889E2E8DFb6019f8Eb51F5d119Bde3'; // Receiver address
const value = '0.0001';

(async () => {

    // initializating sdk...
    const sdk = await initializeSdkGateway(
        { privateKey: process.env.PRIVATE_KEY as string },
        {
            networks: [NetworkNames.Mumbai],
            bundlerApiKey: process.env.BUNDLER_API_KEY
        },
    );
    
    // Retrieve the chainId corresponding to the network name
    const chainId = networkNameToChainId(NetworkNames.Mumbai)

    // set mumbai as default current instance
    const networkInstance = sdk.setCurrentInstance(NetworkNames.Mumbai);

    // clear the transaction batch
    await networkInstance.clearUserOpsFromBatch();

    // add transactions to the batch
    await networkInstance.addUserOpsToBatch({ to: receiverAddress, value: utils.parseEther(value) });
    
    // get balance of the account address
    const balance = await networkInstance.getNativeBalance();
    console.log('balances: ', balance);

    // Estimate transaction details using paymaster for sponsorship mode.
    const op = await networkInstance.estimate({
        paymasterDetails: {
            url: `https://evm-paymaster.kanalabs.io?apiKey=${process.env.PAYMASTER_API_KEY}&chainId=${chainId}`,
            context: { mode: 'sponsor' },
        },
    });
    console.log("op: ", op);

    // sign the UserOp and sending to the bundler...
    const uoHash = await networkInstance.send(op);

    // log the uoHash
    console.log(`UserOpHash: ${uoHash}`)

    let userOpsReceipt = null;
    const timeout = Date.now() + 60000 // 1 minute timeout
    while (userOpsReceipt == null && Date.now() < timeout) {
        await sleep(2)
        userOpsReceipt = await networkInstance.getUserOpReceipt(uoHash);
    }
    console.log('\x1b[33m%s\x1b[0m', `Transaction Receipt: `, userOpsReceipt);
})()

 * PAYMASTER_API_KEY - Contact kanalabs to obtain the API key for authentication.