[mbaha]

Am suddenly interested in building a product that handles your taxes when you give it read access to your Coinbase account.

[brathouz]

You'll need to support a lot more than just importing Coinbase transactions. The site bitcoin.tax lets you import from 17 different sources and, despite its name, handles nearly all digital currencies, not just bitcoin.

However, nothing currently exists that seamlessly handles scenarios like cryptokitties, or when tokens are automatically bought/sold behind-the-scenes of a dapp via 0x, etc.