Swap BNB to BEP20 token

[aurbroszniowski]

Hello, hopefully this is not too dumb to ask, but I couldn't find the explanation anywhere.
A site like PancakeSwap allows to swap BNB to BEP20 tokens.
I tried to do the same with ethers.js and I couldn't find an address for BNB to use with the swapExactTokensForTokens method.
However, if I convert my BNBs to WBNBs, I can do a swap using the WBNB.
I'd like to understand why I can't do it directly using BNB, like PancakeSwap does.
Thanks in advance for any clarification.

[ricmoo]

This is out of my knowledge-base. I know nothing about BNB. Can someone else help out?

[ghost]

swapExactETHForTokens is also available with PancakeSwap
Yes, it says ETH. Yes, it will work with BNB.

[aurbroszniowski]

Thank you for the answer, especially since this was a question about the PancakeSwap API and not ethers.js
For future readers that would be confused, I wrote a blog post about it, after making it work thanks to your help.
https://jsoftbiz.wordpress.com/2021/09/30/learn-dapp-coding-by-writing-a-blockchain-trading-bot-part-2-trade-cryptocurrencies/

[aurbroszniowski]

  let tokenSrc = await routerContract.WETH();       // This corresponds to BNB on the Binance smart chain
    let tokenDest = "0x78867BbEeF44f2326bF8DDd1941a4439382EF2A7"; // address on the testnet
    let tokenPair = [tokenSrc, tokenDest];

    // we pay 0.01 BNB
    const tokenAmountIn = ethers.utils.parseUnits('0.001', 'ether');
    let amounts = await routerContract.getAmountsOut(tokenAmountIn, tokenPair);
    const slippage = 10; // 10%
    const tokenAmountOutMin = amounts[1].sub(amounts[1].mul(slippage).div(100));

    let gasPrice = ethers.utils.parseUnits(`6`, 'gwei');

    const swapTx = await routerContract.swapExactETHForTokens(
            tokenAmountOutMin,
            tokenPair,
            wallet.address,
            Date.now() + 1000 * 60 * 10,
            {
                'gasLimit': 250000,
                'gasPrice': gasPrice,
                'value': tokenAmountIn
            }
    )

    let receipt = await swapTx.wait();