Way too buggy, a time waster
I can't tell you how many hours I have spent over the past two tax seasons, trying to get TaxBit to sync correctly. I eventually abandoned trying to get it to sync automatically via API, and instead went to manual transactions. After many, many tedious hours spent trying to resolve missing cost basis issues, I finally got everything squared away. Then, a few weeks ago, TaxBit did some kind of update on its end, and my crypto balances are now all screwy, with many new unresolved cost basis issues. Two steps forward, followed by four steps back. I have now decided I am done wasting my time trying to get TaxBit to work. Not sure which service I will try next, but I would warn you against going down the TaxBit road. It's not going to work like they advertise. It's not going to work without a lot of time on your end. Then, once you finally get it working, TaxBit will introduce a new bug that sends everything to hell.