Application Programming Interface
a.k.a. API
A doorway that lets one piece of software talk to another, such as your trading bot talking to your broker.
In plain English
A doorway that lets one piece of software talk to another, such as your trading bot talking to your broker.
An application programming interface (API) is a set of rules that lets programs exchange information. In trading, a broker's API lets your own code pull prices, check your account and send orders without you clicking anything.
APIs are the backbone of algorithmic trading. They are also a fast way to make expensive mistakes, because a bug can fire orders far quicker than a human ever could. Test on a demo account first.
Keep this word for good
Your free Private Swap Lounge saves the terms you’ve learned and quizzes you on them. Portal under construction. Expected delivery date is December 01, 2026.