This is an Intrinio NodeJS SDK for Real-Time Stock Prices. It provides real-time stock prices via a two-way WebSocket connection. The Intrinio Real-Time Feeds uses the WebSockets protocol to push stock price quotes to clients in real time. The Intrinio Websockets API will send you the last recorded IEX bid/ask/last quotes, even during off-hours. So you will notice that the first quote update will come through immediately upon connection, and it will have an older timestamp. All quotes afterwards are live updates. Intrinio is a financial data marketplace that is restriction-free with self-sign up, and chat support.
The Google QPX Express API allows developers to search for real flight availability and prices and use this data into their applications. This articles shows you how to integrate Mule with the Google QPX Express API, giving your app a flight availability and price search functionality.
Amazon has cemented itself as a top tier option for charging users thanks to its Amazon Flexible Payments Service API. The crowd-funding site Kickstarter has run hundreds of millions through the API, so it should also get some credit. Although, at Amazon, Kickstarter may get blame instead, having inspired many other sites, which eventually caused Amazon to turn away sites with similar concepts.