Comment by rmah

Banks have supported consumer-level API's since the 1990's. At first they were specific to Intuit Quicken and Microsoft Money but now they have moved to OFX (Open Financial eXchange).

A partial list of banks that support OFX is here: https://wiki.gnucash.org/wiki/OFX_Direct_Connect_Bank_Settin....

For your own bank, look to see if they support import into Intuit Quicken or Microsoft Money. If they do, you can probably access the API directly yourself.

Note, you may have to pay a service fee to access the API. This will vary depending on the bank.