The project seems good but imho if I'm trying to use only one BTC address per transacrion then it is gona be pretty annoying if I would like to add all of the inputs to my wallet. Btw if you are making an application mostly for altcoin users then it can be a good idea to add pump / dump notifications besides the normal 24h change.
If you have one Bitcoin Address with all your funds, that's okay, if you have more than one addres to save your funds, that's also okay with Wallet Tracker. But if you are using a different Bitcoin address for every transaction you make, then, it's not worth at all, that's true. Noted down the feature request about the pump'n'dump notifications.
For multiple addresses, you can take wallet xpub as input. Blockonomics API provides xpub balance