How to get the total BTC held in your Ledger wallet

I am new to ledger.

As a software engineer, I would like to create my own app (for my own personal use) like a more basic version of Ledger Live.

I want to display my balance on a private dashboard on a website I built for myself.

I want this website to display output like this:

{
  BTC: 0.1,
  ETH: 1,
  NEAR: 20
}

Here, each ticker represents the total (sum) of all tokens “held” by the Ledger.

Since Bitcoin, Ethereum, and other blockchains are all public, we thought it would be easy to look up wallet balances via public wallet addresses.

But my understanding is that the Ledger public wallet address for each blockchain changes after the transaction.

So how do we reach our goal?

Again, we want a simple sum of the tokens shown in the JSON above.

And I want to be able to get that amount automatically on a regular basis without having to log into Ledger.

thank you!

PS Is it possible to monitor my balance from a previously generated address using the xpub address I found? How to know my balance on my Ledger Nano S?

But when I go to Ledger Live > Accounts > Bitcoin > wrench icon > Advanced, grab the “xpub” string and browse to https://www.blockchain.com/btc/xpub/xxxx, I see 20 wallet addresses. are displayed (split into 4 pages), each with 0 transactions.So these are future Wallet instead of what my Ledger used to use.