Prefill your coin address on faucet pages with JavaScript! [Google Chrome version]

2년 전


Would you prefer to have your coin address prefilled on faucet claim & login pages?

If you love faucets you probably don't love those like * that forget your coin address every time you make a claim, requiring you to enter it over and over. This is annoying, and unneccessary.


What if I told you that you could use JavaScript to do this for you automagically?


I'm going to show you how.

Caveat: this technique requires the use of a browser extension, if you're against such things for any reason then read no further. Recording your cryptocurrency public key (receiving address) in an automation script is perfectly safe because it's public & already in the public domain but you should NEVER record a private key, username, or password in this manner, such information is too private and powerful.

Prerequisite: Install Browser Extension

To run the Javascript a Google Chrome extension called Tampermonkey is required, grab that now:


1. Setup Faucet Page Script

Go to a * faucet page, we will use the Litecoin faucet page as an example to follow, here's my referral link:

Click the Tampermonkey extension in your browser toolbar and choose "Create a new script..."

A new blank script is displayed, note the @match value is already set to the current URL...

Copy and paste this codeblock to replace the contents:

// ==UserScript==
// @name address prefill
// @namespace    unoriginal-but-unique
// @version      0.1
// @description  to the moon, automagically!
// @author       You
// @match*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    if (document.readyState == "complete" || document.readyState == "loaded" || document.readyState == "interactive") {
        document.getElementById("address").value = "neuromancer";
    } else {
        document.addEventListener("DOMContentLoaded", function(event) {
            document.getElementById("address").value = "neuromancer";

Note that we add /* to the end of the URL to ensure the script matches subpages as well

Tailor the script: replace neuromancer (keep the quotes) with your coin receiving address & click save

Refresh the faucet page to see the results

Tampermonkey now displays a red box with a "1" in it, indicating it's running 1 script on the current page.

2 Reusing the script

The script can be reused on other * pages if you tailor it to accordingly. Below is the functional part of the code, just copy & paste it into each newly created script where it says // Your code here...:

    if (document.readyState == "complete" || document.readyState == "loaded" || document.readyState == "interactive") {
        document.getElementById("address").value = "neuromancer";
    } else {
        document.addEventListener("DOMContentLoaded", function(event) {
            document.getElementById("address").value = "neuromancer";

Then tailor each new script to your needs by changing these 4 values (highlighted in the image above):

  1. @name: a name for saving the script, unique to each version, eg: address prefill, address prefill, etc
  2. @namespace: a unique namespace the script runs under, can be anything and can be reused so long as it's unique to prevent conflict with other scripts that may be running on the page
  3. @match: the page the script targets, it's pre-set during script creation at each site but you should append it with /*
  4. neuromancer: me, just kidding, replace my name with your coin receiving address

Here are some more * referral links for you:

The script can also be tailored for other faucet pages, here's a version modified to prefill Moon faucet login pages, just remember to tailor each new script with your 4 values:

// ==/UserScript==

(function() {
    'use strict';

    if (document.readyState == "complete" || document.readyState == "loaded" || document.readyState == "interactive") {
        document.getElementById("BodyPlaceholder_PaymentAddressTextbox").value = "neuromancer";
    } else {
        document.addEventListener("DOMContentLoaded", function(event) {
            document.getElementById("BodyPlaceholder_PaymentAddressTextbox").value = "neuromancer";

And here's some Moon faucet referral links:

Now head back to those faucets and STEEM ON!

This article is provided as-is for informational purposes only, I neither condone or condemn the use of faucets, browser plugins/extensions, or JavaScript.

Questions and comments are welcomed in the replies. If you'd like to see more articles like this then ^vote and resteem. Considerable effort has gone into researching, testing, graphics capture/edit, and formatting for this article.

If you liked it, then you shoulda put a ^vote on it!

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I'll definitely be giving this a try. It's always great to find little tricks like this, and I really appreciate the time you took to type out a tutorial. A couple of my latest posts were tutorials and I know how much time it can take to be sure you're communicating instructions effectively.

Thanks for sharing!


You're most welcome, I'm really glad this may prove useful to you.

Just remember that the first code block is written specifically for that particular Litecoin faucet and replaces all the code in the Tampermonkey window, if you wish to use the technique on other faucets from the same provider:

  1. Go to the faucet page
  2. Create a new Tampermonkey script
  3. Replace the text // Your code here... with the contents of the second code block
  4. Name the script
  5. Add /* at the end of the URL in @match
  6. Put in your @namespace, or just keep unoriginal-but-unique it's not likely to exist in any other scripts ;)
  7. Replace neuromancer with your coin receiving address
  8. Save it
  9. Refresh

If you use Moon faucets, use the third code block in the same manner, I wrote it specifically for their login pages.

Firefox users, stay tuned: a version written for Firefox Firefox & Greasemonkey Greasemonkey is almost finished and will be published very soon.

Other faucets: Ability to use this is entirely dependent on the manner in which the faucet site is coded, but we can always try so let me know & I'll look into it.

You've received an upvote from #TheUnmentionables - a SteemIt community full of members who like to kick ass, take names, and occasionally do it wearing (or forgetting to wear) our unmentionables...


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Wow you are amazing!


That's very kind of you, I often get asked to solve problems, sometimes the results are useful to others and I like to share them, I hope it's useful to you. If you think it may be useful to others feel free to resteem or share the link.

I will bookmark this and study on this when I have the time. Thanks!


You're welcome, I hope it's useful to you. I'm currently working on updating the Firefox version to match changes in the browser that came with the release of Firefox 57.0 (AKA: Quantum).


I think this will be useful once I have read through and if you don't mind, if I have any noob questions, I will find you in the unmentionables discord group...