The Poloniex Python API enables developers to access the Poloniex API's functions from Python code. This library shows users how to retrieve their open orders and trade histories, place buy and sell orders, cancel orders, and place a withdrawal for a given currency.
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.
Barchart announced a new API to bolster its OnDemand financial data platform. The event-based API monitors financial news and markets for key events and notifies users of such events in real-time to empower brokers and investors to make better decisions. Users can incorporate its own data as well.