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javascriptethereumsolidityweb3jserc20
Brian Lee Victory
Brian Lee Victory

Reputation: 73

How to Use Web3 to Purchase ERC20 Token

I'm trying to implement a solidity "purchase" function into web3. Ultimately, I want to have a button where a user would then have metamask open to send a fixed amount(1 ether for a simple example) to the smart contract in exchange for an ERC20 token. I've learned how to transfer tokens between two wallets, but now I'd like to go a step further and learn how to send Ether to receive an ERC20. This is the solidity "purchase" function I've been using:

function purchase(uint amount, uint tokens) public payable{
        require (msg.value >= amount * 1 ether, "You must pay at least 1 ether per token");
        balances[address (this)] -= tokens;
        balances[msg.sender] += tokens;

Right now I've been using this with an Onclick button in conjunction with metamask to transfer ERC20's:

async function transfer() {
        contract.methods.transfer("Address", "Token quantity").send({
        from: "Address"});

Do you have any tips on how to go about making this Ether to ERC20 function in JS? Thank you!

Upvotes: 2

Views: 2360

Answers (1)

Arrow
Arrow

Reputation: 113

There is insufficient information in the question. If you are asking how to call the purchase you have written in solidity then answer is as follow:

contract.methods.purchase("amount", "Token quantity").send({
    from: "Address", value: ("amount"*"Token quantity"(in wei)) });

Upvotes: 2

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