Services like Plaid and Mint can only read data, isn't it? Has that changed?
Banking in the US is so horrible at the moment. there’s an immense opportunity for someone to come through and give a better consumer experience, but I fear the barriers to entry are far too high. I had high hopes for Simple.com, but they ended up destroying about every useful feature they had and falling way short of the mark...
There was a clever hack someone posted here a while ago about using the email alerts feature to essentially get a read-only feed of transactions from a bank account. It does require you to parse the email and build your own system, so it wouldn't work for most people.