The TradeKing Ruby Sample Code by TradeKing demonstrates API interaction. It provides code to authenticate, set up OAuth, update token, and make a request to the API endpoint. A JSON response is the result of the code flow.
Bottomline Technologies, a provider of financial technology that aims to help make business payments simple, smart and secure, today announced the release of a new set of APIs to enable connectivity for banks, corporate clients, and other third-parties to the company’s Paymode-X platform.
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.