The Calcbench R Sample Code demonstrates how to access financial and accounting data including companies and period parameters. API access is not included in the standard Calcbench subscription. Contact Calcbench for development support.
It's been two and a half years since we wrote about the API you need $25,000 to use. According to several reports online, accounts must hold $500,000 or perform 30 or more trades per quarter to use the TD Ameritrade API.
TrueLayer has introduced a PSD2-compliant Payments API. The API enables transfer of funds directly from bank account to bank account. It uses active authentication for the highest possible security, and transferred funds are received instantly. The API is currently in beta testing.