First you must create and deploy a SMART-CONTRACT in the Ethereum Test Net, you can follow these instructions:

This post is based in the information of the previous post:

To start, we have hosted a WordPress site and we want to create a “button” to interact with an Ethereum Smart-contract.

In this case, we will create a button to call the method “transfer”, it will transfer 88,88 tokens through MetaMask (it’s a Google Chrome Plugin). The code is inserted in a page of WordPress.

Then, we can start to create the WordPress page and insert the Javascript code.

Captura de pantalla 2017-12-27 a las 14.12.28

The code:

<script src=""></script>
<script src=""></script>
    window.addEventListener('load', function() {
    // Check if Web3 has been injected by the browser:
    if (typeof web3 !== 'undefined') {
        // You have a web3 browser! Continue below!
    } else {
        //alert("No hay web3");
        // Warn the user that they need to get a web3 browser
        // Or install MetaMask, maybe with a nice graphic.
const abi = [{
    "constant": false,
    "inputs": [
            "name": "_to",
            "type": "address"
            "name": "_value",
            "type": "uint256"
    "name": "transfer",
    "outputs": [
            "name": "success",
            "type": "bool"
    "payable": false,
    "type": "function"
const contract_address = '0xf035755df96ad968a7ad52c968dbe86d52927f5b'
const etherValue = web3.toWei(10, 'ether');
var address = '0x91612055A68aD74A6e756615941Ac59e9220A940'
function startApp(web3) {
    const eth = new Eth(web3.currentProvider)
    const token = eth.contract(abi).at(contract_address);
function listenForClicks (miniToken, web3) {
    var button = document.querySelector('button.transferFunds')
    web3.eth.getAccounts(function(err, accounts) { console.log(accounts); address = accounts.toString(); })
    button.addEventListener('click', function() {
        miniToken.transfer(contract_address, '88888888888888888888', { from: address })
            .then(function (txHash) {
            console.log('Transaction sent')
async function waitForTxToBeMined (txHash) {
    let txReceipt
    while (!txReceipt) {
        try {
            txReceipt = await eth.getTransactionReceipt(txHash)
        } catch (err) {
            return indicateFailure(err)
<button class="transferFunds">Send Money!</button>

Then we can save the page and test it! (Remember to change the contract address and the amount of tokens to transfer!.. also to connect the MetaMask plugin!)

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Once we submit the transaction, we will see in Etherscan the result of calling the method “transfer“.

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Captura de pantalla 2017-12-27 a las 13.47.31

And we will see “Transaction sent” in the Console log!

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Post by MrAddon


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9 replies on “How to call methods of Ethereum Smart-Contracts from WordPress with MetaMask, Web3 and Javascript

  1. Hi, thanks for this. I have a questions, can the user enter the amount they want?

    Im using a points system, I need a user to be able to deposit my token into the points system and withdraw as well.

    Can I make this work?


    Liked by 2 people

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