user135109: I am trying to write a gateway system where users can check the data upon the callback that is sent to their specific url.
I am wondering how I could go about checking that the payment has been received.
I have code that will generate address's and check balances but not an event or socket to automatically check when that address has received funds.
What is the best way to go about this?
I know i can use blockchains online to read data, but there is not 1 blockchain that does all cryptos so i'd be baffling between here and there which is not what I want to do really.
I am NOT running my own node, but generating public and private keys.
Many thanks in advance!

user134811: Alright, so, pretending it's "Bitcoin" instead of "cryptocurrencies", if you don't run your own full node and want to somehow check you've received the money with Node JS, you can just use the API of a block explorer (e.g., mempool.space).
Alternatively, you can just scrape the page of the block explorer with puppeteer.

135109: <p>I am trying to write a gateway system where users can check the data upon the callback that is sent to their specific url.</p>
<p>I am wondering how I could go about checking that the payment has been received.</p>
<p>I have code that will generate address's and check balances but not an event or socket to automatically check when that address has received funds.</p>
<p>What is the best way to go about this?</p>
<p>I know i can use blockchains online to read data, but there is not 1 blockchain that does all cryptos so i'd be baffling between here and there which is not what I want to do really.</p>
<p>I am NOT running my own node, but generating public and private keys.</p>
<p>Many thanks in advance!</p>
 134811: <p>Alright, so, pretending it's &quot;Bitcoin&quot; instead of &quot;cryptocurrencies&quot;, if you don't run your own full node and want to somehow check you've received the money with Node JS, you can just use the API of a block explorer (e.g., <a href="https://mempool.space/docs/api/websocket" rel="nofollow noreferrer">mempool.space</a>).</p>
<p>Alternatively, you can just scrape the page of the block explorer with <a href="https://puppeteer.github.io/puppeteer/" rel="nofollow noreferrer">puppeteer</a>.</p>
