PancakeSwap Orders – How to Place Orders on PancakeSwap Using Code

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What is the best approach to actually trade on pancake swap from code? I could not find any resource or guides on how to do so, if its possible at all.

Is there a way to use web3 or any wrapper to use Nodejs and place orders?

Best Answer

Yes, like with any smart contract, you can call the functions directly from code with tools like web3js.

In the case of pancakeswap, the easiest way is to call the functions on the router such as swapExactTokensForTokens. Uniswap has a very detailed documentation and pancakeswap is the same as UniswapV2, so you can start from there.

Now if you want to know how to interact with the blockchain from code, that would require a full tutorial and you can find many online.

Answer for Q1

If not specified, usually the value is in "wei".

So "1 ether" would be 1000000000000000000 wei.

You can use web3.utils to convert "ether"->"wei". web3.utils.toWei('0.01', 'ether')

[Ethereum] Call swapExactETHForTokens from contract and pay with contract balance

You should be able to achieve that if you send the ether along the function call. In solc v0.8 you achieve that using the function call options {value: amount}.

The resulting function should look like this:

function swap() public {
    uint deadline = block.timestamp + 100;
    address[] memory path = new address[](2);
    path[0] = address(WBNB);
    path[1] = address(target);

    // Send all balance
    uint256 amount = address(this).balance;

    // TODO: Check the result
    pancakeRouter.swapExactETHForTokens{value: amount}(0, path, owner, deadline);
}

Best Answer

Related Solutions

[Ethereum] How to send correct SwapExactEthForTokens params types on ethers/web3.js

Answer for Q1

[Ethereum] Call swapExactETHForTokens from contract and pay with contract balance

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