Forgive the shameless self-promotion, but we at Seed offer a customer facing API for read-only transaction data. We would happily build out more API features, but we've seen very little demand, despite the frequent HN threads about bank APIs.
We are a business focused bank, but we support sole proprietors and freelancers as well.
It's really unclear to me what your product is. I would have given up trying to figure out if you hadn't implied that it's somehow related to what this cool blog post accomplishes.
From the FAQ, my best guess is that you offer businesses bank accounts that come bundled with the reporting you'd get with something like Mint/Quickbooks?
It's OK to basically be two services glued together, but why are you better than just the two existing services, were they to be glued together?
We are a business focused bank, but we support sole proprietors and freelancers as well.
API docs are here: http://docs.seed.co/v1.0.0/docs
https://seed.co
p.s. We are working on Android I promise please don't yell at us (again).