What Is BEP-20? How BSC Token Standards Work for Presale Investors

BEP-20: The Token Standard Powering BSC Presales

If you've ever bought a token on PancakeSwap, received presale tokens in your MetaMask BNB Chain wallet, or checked a token contract on BscScan, you've interacted with BEP-20. Understanding how this standard works — and what its contract functions reveal about a token's safety — is fundamental knowledge for any BSC presale investor.

BEP-20 vs ERC-20: How Similar Are They?

The Core BEP-20 Standard Functions

Mandatory Functions (All BEP-20 Tokens Must Implement)

Standard Optional Functions

• name(): Returns token name (e.g., "Wrapped BNB")
• symbol(): Returns ticker (e.g., "WBNB")
• decimals(): Returns decimal precision (standard: 18)

Reading Transfer Tax in BEP-20 Contracts

Transfer taxes are implemented inside the _transfer() internal function. A token with 5% buy and 5% sell tax will show code like:

if (isSell) {
    fee = amount * sellFee / 100;  // 5% deducted on sells
} else if (isBuy) {
    fee = amount * buyFee / 100;   // 5% deducted on buys
}
uint256 transferAmount = amount - fee;

The deducted fee is sent to designated wallets (liquidity, marketing, burn). Always locate and read the _transfer function in any BSC token before investing. For a complete guide on interacting with these tokens, see our BSC IDO launchpads guide.

BEP-20 Safety Evaluation Checklist

Setting Up MetaMask for BEP-20 Tokens

1. Open MetaMask → click network selector → "Add Network"
2. Add BNB Smart Chain: RPC https://bsc-dataseed.binance.org, Chain ID 56, Symbol BNB
3. To add a BEP-20 token: "Import Tokens" → paste contract address → auto-fill verifies symbol
4. Transfer BNB to your MetaMask BNB Chain address (withdraw from exchange as BEP-20)

For a complete setup walkthrough, see our MetaMask setup guide.

Glossary

BEP-20

The fungible token standard on BNB Smart Chain, functionally equivalent to ERC-20 on Ethereum.

EVM (Ethereum Virtual Machine)

The computing environment that executes smart contract code — BNB Chain is EVM-compatible, enabling the same Solidity code to run on both networks.

Decimals

The number of decimal places a token supports — standard is 18, meaning 1 token = 10^18 smallest units.

Transfer Tax

A percentage fee deducted from every token transfer, implemented in the _transfer() function.

Allowance

Permission granted to a smart contract to spend tokens from your wallet, tracked by the approve() and allowance() functions.

Disclaimer

This is educational content about BEP-20 token mechanics. Smart contract interaction carries risk — always verify contract addresses from official sources. This is not financial or investment advice.