const sender = Ethers.send("eth_requestAccounts", [])[0]; if (!sender) return "Please login first"; const erc20Abi = fetch( "https://gist.githubusercontent.com/veox/8800debbf56e24718f9f483e1e40c35c/raw/f853187315486225002ba56e5283c1dba0556e6f/erc20.abi.json" ); if (!erc20Abi.ok) { return "scam"; } const iface = new ethers.utils.Interface(erc20Abi.body); initState({ token: "", tokenDecimals: "", sendTo: "", sender, senderBalance: "0", receiverBalance: "0", receiver: "", amount: "1", }); const tokens = { "Select Token": "", USDT: "0xdac17f958d2ee523a2206206994597c13d831ec7", DAI: "0x6b175474e89094c44da98b954eedeac495271d0f", USDC: "0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48", MKR: "0x9f8f72aa9304c8b593d555f12ef6589cc3a579a2", }; const tokensMenuItems = Object.keys(tokens).map((token) => ( <option value={tokens[token]}>{token}</option> )); const setSendTo = (sendTo) => { const receiver = Ethers.resolveName(sendTo); State.update({ sendTo, receiver: receiver ?? "" }); refreshBalances(); }; const setToken = (token) => { State.update({ token }); getTokenDecimals(); }; const getTokenBalance = (receiver) => { const encodedData = iface.encodeFunctionData("balanceOf", [receiver]); return Ethers.provider() .call({ to: state.token, data: encodedData, }) .then((rawBalance) => { const receiverBalanceHex = iface.decodeFunctionResult( "balanceOf", rawBalance ); return Big(receiverBalanceHex.toString()) .div(Big(10).pow(state.tokenDecimals)) .toFixed(2) .replace(/\d(?=(\d{3})+\.)/g, "$&,"); }); }; const getTokenDecimals = () => { const encodedData = iface.encodeFunctionData("decimals", []); return Ethers.provider() .call({ to: state.token, data: encodedData, }) .then((tokenDecimals) => { State.update({ tokenDecimals: parseInt(Number(tokenDecimals)) }); refreshBalances(); }); }; const refreshBalances = () => { getTokenBalance(state.sender).then((value) => { State.update({ senderBalance: value }); }); getTokenBalance(state.receiver).then((value) => { State.update({ receiverBalance: value }); }); }; const sendTokens = () => { const erc20 = new ethers.Contract( state.token, erc20Abi.body, Ethers.provider().getSigner() ); let amount = ethers.utils.parseUnits(state.amount, state.tokenDecimals); erc20.transfer(state.receiver, amount); console.log("transactionHash is " + transactionHash); }; return ( <> <h3>Send ERC-20 tokens</h3> <div class="mb-3"> <label for="selectToken">Select token</label> <select class="form-select" id="selectToken" onChange={(e) => { setToken(e.target.value); }} > {tokensMenuItems} </select> </div> <div class="mb-3"> <label for="send-to" class="form-label"> Recepient address </label> <input value={state.sendTo} class="form-control" id="send-to" placeholder="vitalik.eth" onChange={(e) => setSendTo(e.target.value)} /> {state.receiver && ( <div class="text-secondary mt-3">Resolved to {state.receiver}</div> )} {state.receiverBalance != "0" && ( <div class="text-secondary mt-3"> Receiver's balance: {state.receiverBalance} </div> )} {state.senderBalance != "0" && ( <div class="text-secondary mt-3"> Sender's balance: {state.senderBalance} </div> )} </div> <div class="mb-3"> <label for="amount" class="form-label"> Enter the amount </label> <input value={state.amount} class="form-control" id="amount" placeholder="" onChange={(e) => State.update({ amount: e.target.value })} /> </div> <div class="mb-3"> <button onClick={sendTokens}>Send</button> </div> </> );