I am developing a JSP web (based on Java) and I would like to let users send the altcoins to my servers wallet. I need something what would monitor if the coins (DOGE/BTC etc.) has arrived and just after that let the users do something.
Is there anything like this? I am new here and maybe it is broad but let me explain better if you need.
I mean something like this: http://bitcoinj.github.io/getting-started
but not only for BTC also for other coins.