Metamask: How to send transaction to payable contract on Binance Smart Chain without Metamask

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Sending Transactions to Payable Contracts on Binance Smart Chain without Metamask

As a web3 developer, you’re likely familiar with the complexities of interacting with smart contracts on blockchain networks like Ethereum (ERC-20) and Binance Smart Chain. One common challenge when working with payable contracts is sending transactions from external wallets or web3 clients to these contracts. In this article, we’ll explore an alternative approach using Web3’s JavaScript APIs to send transactions to payable contracts on Binance Smart Chain without relying on Metamask.

Why Metamask?

Metamask is a popular wallet solution for Ethereum and other ERC-20 tokens, but it has limitations when it comes to interacting with external wallets or web3 clients that don’t support the same interface. Specifically, Metamask’s JavaScript library has some restrictions on sending transactions directly to payable contracts without additional setup.

Why Binance Smart Chain?

Binance Smart Chain is a fast-growing blockchain network that offers a more streamlined and user-friendly experience for developers compared to Ethereum. As of this writing, Binance Smart Chain supports the BIP-21 standard, which allows for direct transaction sending between the network’s accounts without needing an additional library or configuration.

Sending Transactions with Web3.js

To send transactions from an external wallet (or web3 client) to a payable contract on Binance Smart Chain using Web3.js, you’ll need to:

  • Import the necessary libraries

    : First, import the ethers and web3 libraries in your JavaScript file.

  • Create a new Ethereum provider instance

    : Use the ethers.providers.JsonRpcProvider class to establish a connection to an Ethereum node on Binance Smart Chain (e.g.,

  • Create a contract instance: Using theethers.Contractclass, instantiate your payable contract and set its ABI.

  • Set up your external wallet credentials: Store your external wallet's private key and address in an environment variable or a secure storage solution (e.g., AWS Secrets Manager).

Here's some sample code to get you started:


const ethers = require('ethers');

const Web3 = require('web3');

// Set up your Ethereum node connection using Binance Smart Chain's API

const provider = new Web3.providers.JsonRpcProvider(

'

);

// Create a contract instance from the payable contract ABI and deployment data

const contractAddress = '0x...'; // Replace with your payable contract address

const contractAbi = [...]; // Load your contract's ABI

async function sendTransaction() {

const wallet = new ethers.Wallet('your-wallet-address', 'mainnet');

try {

// Set the transaction data (including the payable contract instance and parameters)

const txData = {

to: contractAddress,

value: web3.utils.toWei('1', 'ether'), // Replace with your payable contract's address

data: [...], // Load the contract's ABI as an array of function calls

};

// Send the transaction using Web3.js'signTransactionmethod

const tx = await wallet.signTransaction(txData);

// Use the signed transaction to execute it on the Ethereum network (Binance Smart Chain)

try {

await provider.sendTransaction(tx);

} catch (error) {

console.error('Error sending transaction:', error.message);

}

} catch (error) {

console.error('Error initializing wallet:', error.message);

}

}

This example code creates an instance of your payable contract, sets up a connection to the Binance Smart Chain node, and sends a signed transaction using Web3.js' signTransaction` method. The resulting transaction is then executed on the Ethereum network.

Ethereum Utxo

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