BEP-20 Token Development (BNB Chain)

BEP-20 Token Development (BNB Chain)

BEP-20 is the BNB Chain version of ERC-20. Interface is identical, ABI compatible, tooling the same — Hardhat or Foundry with minor network config changes. If you've already developed ERC-20 tokens — BEP-20 will take minimal time to adapt.

Fundamental difference: BNB Smart Chain (BSC) uses Proof of Staked Authority (PoSA) with 21 validators instead of thousands of Ethereum nodes. This provides fast blocks (3 seconds) and cheap transactions ($0.01–0.05 for regular transfer), but at cost of more centralized network.

What you really need in BEP-20 token

Basic token is 30 lines on top of OpenZeppelin ERC20. Question is not "how to write token" but "what functionality does your project need". Typical list:

Minting and burn — managed emission through AccessControl:

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/access/AccessControl.sol";
import "@openzeppelin/contracts/token/ERC20/extensions/ERC20Permit.sol";
import "@openzeppelin/contracts/token/ERC20/extensions/ERC20Votes.sol";

contract MyBEP20Token is ERC20, AccessControl, ERC20Permit, ERC20Votes {
    bytes32 public constant MINTER_ROLE = keccak256("MINTER_ROLE");
    
    uint256 public constant MAX_SUPPLY = 1_000_000_000 * 10**18;  // 1B tokens
    
    constructor(address initialAdmin) 
        ERC20("MyToken", "MTK") 
        ERC20Permit("MyToken") 
    {
        _grantRole(DEFAULT_ADMIN_ROLE, initialAdmin);
        _grantRole(MINTER_ROLE, initialAdmin);
    }
    
    function mint(address to, uint256 amount) external onlyRole(MINTER_ROLE) {
        require(totalSupply() + amount <= MAX_SUPPLY, "Exceeds max supply");
        _mint(to, amount);
    }
    
    function burn(uint256 amount) external {
        _burn(msg.sender, amount);
    }
    
    // Needed for ERC20Votes + ERC20Permit compatibility
    function _afterTokenTransfer(address from, address to, uint256 amount)
        internal override(ERC20, ERC20Votes) {
        super._afterTokenTransfer(from, to, amount);
    }

    function _mint(address to, uint256 amount)
        internal override(ERC20, ERC20Votes) {
        super._mint(to, amount);
    }

    function _burn(address account, uint256 amount)
        internal override(ERC20, ERC20Votes) {
        super._burn(account, amount);
    }
}

ERC20Permit adds gasless approvals through signatures (EIP-2612) — important for UX. ERC20Votes — if token is planned for governance.

Deploy on BSC

// hardhat.config.js
module.exports = {
  networks: {
    bsc: {
      url: "https://bsc-dataseed1.binance.org",
      chainId: 56,
      accounts: [process.env.PRIVATE_KEY],
    },
    bscTestnet: {
      url: "https://data-seed-prebsc-1-s1.binance.org:8545",
      chainId: 97,
      accounts: [process.env.PRIVATE_KEY],
    }
  },
  etherscan: {
    apiKey: {
      bsc: process.env.BSCSCAN_API_KEY,
      bscTestnet: process.env.BSCSCAN_API_KEY,
    }
  }
}

Contract verification on BscScan is mandatory — users will check code before buying.

What's included in the work

Development, tests (100% coverage of key functions), deploy on testnet and mainnet, verification on BscScan, basic documentation on contract functions. Timeline: 3–5 days for standard token without exotic logic.