Sounds like Open Banking which is government driven & regulated, depending on where you are. There are a couple of startups that act as an abstraction layer to try to make the experience "frictionless", like TrueLayer. Source: over 1 year ago

You won't avoid interfacing with an API. Even if you don't want to use Stripe/PayPal, you'll need to wrestle with a banks own API or some kind of broker. TrueLayer is a popular way in Europe to access banks that support the Open Banking API. It is through a banking API that you will get confirmation that a payment has been made, so there should be no chance of sending items "for free". Unless you're posting... Source: over 1 year ago

I had a subscription with TrueLayer. The API service was smooth and their team updated me from time to time. They even helped me with regulation by giving us an agency under their FCA license. Eventually I transferred to Nordigen due to a friend’s recommendation. It was also free so why not. It was easy to integrate their program to my business model. One particular program I am happily using that involves open... Source: over 2 years ago

• The technology that helped us connect you with your banks is powered by TrueLayer Ltd, which is regulated by the UK Financial Conduct Authority (FCA) and their registration number is 901096. We are also registered with the FCA (928953), as an agent of TrueLayer. You will see their interface when you choose your banks as well as a statement in our app stating this relationship. More info about TrueLayer if you... - Source: Hacker News / almost 3 years ago

Here is one but not for equities https://tradinglite.com/. Source: almost 3 years ago

I saw some of the members of this community are using https://tradinglite.com/ to scan for sell walls, also in the past. Something called trading x-ray. Source: about 3 years ago