You can now check the balance of up to 465 addresses simultaneously
I have to ask: why 465?
This is a limitation of the URL size.
As it is a GET request, each address goes into the URL parameter in the browser internally.
It works like this. WHen you enter the addresses in the web page, your browser will make this request:
https://blockchain.info/balance?active=ADDRESS1|ADDRESS2.....
The size of this URL becomes huge with a few addresses.
Each browser has a different limit. 465 is a safe number, however, you might be able to make it work with more addresses using google chrome which has a higher limit (it also depends on the address formats, which may vary as well)
You might find some more useful discussions here:
https://stackoverflow.com/questions/2659952/maximum-length-of-http-get-requesthttps://stackoverflow.com/questions/417142/what-is-the-maximum-length-of-a-url-in-different-browsershttps://www.geeksforgeeks.org/maximum-length-of-a-url-in-different-browsers/Edit: I also made a different code if you are using less than 20 addresses, using mempool.space. It is slower, but you will make one request for each address (so you will make a total of 20 requests). More than that, you will get block, so I use the other API from blockchair.
Mempool.space API is better and gives more details about unconfirmed transactions as well.
