These are the APIs I consider to be the most relevant in my storytelling around APIs, and reflect the APIs that are most used by developers, but also have APIs that will be relevant across a wide audience.

I'll be adding other "stacks" of APIs in different verticals, as I update them. Making them available in the left-hand navigation, allowing for easier browsing of the best of the APIs I am studying as part of my research.

AWS EC2
Amazon Elastic Compute Cloud is a web service that provides resizable compute capacity in the cloud. It is designed to make web-scale cloud computing easier for developers. Amazon EC2s simple web service interface allows you to obtain and configure capacity with minimal friction. It provides you with complete control of your computing resources and lets you run on Amazonrsquo;s proven computing environment. Amazon EC2 reduces the time required to obtain and boot new server instances to minutes, allowing you to quickly scale capacity, both up and down, as your computing requirements change. Amazon EC2 changes the economics of computing by allowing you to pay only for capacity that you actually use. Amazon EC2 provides developers the tools to build failure resilient applications and isolate themselves from common failure scenarios.

AWS EC2 API (OpenAPI Spec)

AWS RDS
Amazon Relational Database Service (Amazon RDS) makes it easy to set up, operate, and scale anbsp;relational databasenbsp;in the cloud. It provides cost-efficient and resizable capacity while managing time-consuming database administration tasks, freeing you up to focus on your applications and business. Amazon RDS provides you six familiar database engines to choose from, includingnbsp;Amazon Aurora,nbsp;PostgreSQL,nbsp;MySQL,nbsp;MariaDB,nbsp;Oracle, andnbsp;Microsoft SQL Server.

Amazon RDS API (OpenAPI Spec)

AWS S3
Amazon Simple Storage Service (Amazon S3) is object storage with a simple web service interface to store and retrieve any amount of data from anywhere on the web. It is designed to deliver 99.999999999% durability, and scale past trillions of objects worldwide.nCustomers use S3 as a bulk repository, or data lake, for analytics; backup amp; recovery; disaster recovery; and serverless computing. Many cloud-native applications even use S3 as primary storage.nIts simple to move large volumes of data into or out of S3 with Amazonsnbsp;cloud data migrationnbsp;options. Once data is stored in Amazon S3, it can be automatically tiered into lower cost, longer-termnbsp;cloud storagenbsp;classes like S3 Standard - Infrequent Access and Amazon Glacier for archiving.

AWS S3 (OpenAPI Spec)

Best Buy APIs
400+ brands. 950,000+ reviews. 725,000+ products. And weu0026rsquo;re always growing. Welcome to Best Buy APIs. Revolutionizing retail has never been easier. We strive to only limit our APIs to your imagination. Explore the possibilities with customized shopping experiences that move your users. Itu0026rsquo;s your partyu0026mdash;weu0026rsquo;re just hosting it. Interact with your fellow API users and tell us how we can improve. Letu0026rsquo;s shape the future of retail together. Weu0026rsquo;re here to help bring your vision to life. Test-drive our APIs, learn new techniques and let our dedicated team of developers steer you away from any road blocks. We donu0026rsquo;t just give credit where creditu0026rsquo;s dueu0026mdash;we give cash. Find out how you can earn revenue by teaming with Best Buy.

Best Buy BBYOpen BBYFeed (OpenAPI Spec)
Best Buy BBYOpen BBYOffer (OpenAPI Spec)
Best Buy BBYOpen BBYScan (OpenAPI Spec)
Best Buy BBYOpen Categories (OpenAPI Spec)
Best Buy BBYOpen Commerce (OpenAPI Spec)
Best Buy BBYOpen Products (OpenAPI Spec)
Best Buy BBYOpen Reviews (OpenAPI Spec)
Best Buy BBYOpen Stores (OpenAPI Spec)

Bit.ly
Bitly is a URL shortening service. The company Bitly, Inc. was established in 2008. It is privately held and based in New York City. Bitly shortens 600 million links per month,[2] for use in social networking, SMS, and email. Bitly makes money by charging for access to aggregate data created as a result of many people using the shortened URLs.

Bitly Domains API (OpenAPI Spec)
Bitly Link API (OpenAPI Spec)
Bitly Link Metrics API (OpenAPI Spec)
Bitly Organization Metric API (OpenAPI Spec)
Bitly User API (OpenAPI Spec)
Bitly User Metrics API (OpenAPI Spec)

Blizzard
This is the documentation for the RESTful APIs exposed through the World of Warcraft community site as a service to the World of Warcraft community.

Box
Box Inc. (formerly Box.net) is an online file sharing and Cloud content management service for enterprise companies. The company has adopted a freemium business model, and provides 5 GB of free storage [3] for personal accounts. A mobile version of the service is available for Android, BlackBerry, iOS, WebOS, and Windows Phone devices. The company is based in Los Altos, California.

Box (OpenAPI Spec)

Discogs
Discogs, short for discographies, is a website and crowdsourced database of information about audio recordings, including commercial releases, promotional releases, and bootleg or off-label releases. The Discogs servers, currently hosted under the domain name discogs.com, are owned by Zink Media, Inc., and are located in Portland, Oregon, US. While the site lists releases in all genres and on all formats, it is especially known as the largest online database of electronic music releases, and of releases on vinyl media. Discogs currently contains over 6 million releases, by 3.9 million artists, across over 743,000 labels, contributed from nearly 238,000 contributor user accounts u2013 with these figures constantly growing as users continually add previously unlisted releases to the site over time

Disqus
Disqus (/du00ef-sku00fcs/) is an online discussion and commenting service for websites and online communities that uses a networked platform. The company's platform includes various features, such as social integration, social networking, user profiles, spam and moderation tools, analytics, email notifications, and mobile commenting.

Disqus Blacklists API (OpenAPI Spec)
Disqus Categories API (OpenAPI Spec)
Disqus Forums API (OpenAPI Spec)
Disqus Imports API (OpenAPI Spec)
Disqus Posts API (OpenAPI Spec)
Disqus Threads API (OpenAPI Spec)
Disqus Users API (OpenAPI Spec)
Disqus Whitelists API (OpenAPI Spec)

Dropbox
Dropbox is a file hosting service operated by Dropbox, Inc., that offers cloud storage, file synchronization, and client software. Dropbox allows users to create a special folder on each of their computers, which Dropbox then synchronizes so that it appears to be the same folder (with the same contents) regardless of which computer is used to view it. Files placed in this folder also are accessible through a website and mobile phone applications.

Dropbox Core API (OpenAPI Spec)
Dropbox for Business API (OpenAPI Spec)

Dwolla
Dwolla provides a free web based software platform which allows users to send, receive, and request funds from any other user. Dwollarsquo;s maximum transaction cost is 25 cents per transaction.

Dwolla (OpenAPI Spec)

eBay
Buy and sell electronics, cars, fashion apparel, collectibles, sporting goods, digital cameras, baby items, coupons, and everything else on eBay, the worlds online marketplace.

Etsy
Etsy is a website that focuses on handmade and vintage items, as well as art and craft supplies. The items include art, photography, clothing, jewelry, edibles, quilts, and toys. Etsy is modeled after open craft fairs that give sellers personal storefronts where they can list their goods. The company charges users a flat listing fee (of 20 cents per items), and takes a commission of 3.5% off all items sold. Since its launch in June 2005, the site has continually added new widgets and features, and has seen corresponding growth.

Etsy (OpenAPI Spec)

Eventbrite
Eventbrite believes that anyone can be an event organizer. That's why they offer tools that make it easy to sell tickets to all kinds of events whether it's a photography class or a sold-out concert, an inspiring conference or an air-guitar competition. With Eventbrite, organizers can create a customizable event page; spread the word with social media; collect money; and gain visibility into attendees and sales. Eventbrite is for anyone planning or attending an event. It empowers event organizers to become more efficient and effective when bringing people together. And people everywhere are searching Eventbrite to discover great events that matter to them.n

Eventbrite Categories API (OpenAPI Spec)
Eventbrite Events API (OpenAPI Spec)
Eventbrite Formats API (OpenAPI Spec)
Eventbrite Media API (OpenAPI Spec)
Eventbrite Orders API (OpenAPI Spec)
Eventbrite Organizers API (OpenAPI Spec)
Eventbrite System API (OpenAPI Spec)
Eventbrite Users API (OpenAPI Spec)
Eventbrite Venue API (OpenAPI Spec)
Eventbrite Webhooks API (OpenAPI Spec)

Expedia
Expedia.com is an Internet-based travel agency and a part of Expedia, Inc.. It books airline tickets, hotel reservations, car rentals, cruises, vacation packages, and various attractions and services via the World Wide Web and telephone travel agents. The site uses the Sabre reservation system as their main Global reservations system.

Expedia API (OpenAPI Spec)

Facebook
Facebook is an online social networking service that allows its users to connect with friends and family as well as make new connections. It provides its users with the ability to create a profile, update information, add images, send friend requests, and accept requests from other users. Its features include status update, photo tagging and sharing, and more.

Facebook Graph API (OpenAPI Spec)

FedEx
FedEx provides customers and businesses worldwide with a broad portfolio of transportation, e-commerce and business services. We offer integrated business applications through operating companies competing collectively and managed collaboratively, under the respected FedEx brand. Consistently ranked among the worldrsquo;s most admired and trusted employers, FedEx inspires its more than 290,000 employees to remain absolutely, positively focused on safety, the highest ethical and professional standards and the needs of their customers and communities.

Fitbit
Fitbit Inc. is a company headquartered in San Francisco, California, United States. Founded and managed by James Park and Eric Friedman, the company is known for its product of the same name, the Fitbit Tracker, a wireless-enabled wearable device that measures data such as the number of steps walked, quality of sleep, and other personal metrics. The average price of the Fitbit is between $60u2013$130, depending on the model. However, data cannot be downloaded off the fitbit website unless one pays the premium membership price of $49 per year. Intraday data analysis cannot be downloaded at all.

Fitbit Activities API (OpenAPI Spec)
Fitbit Badges API (OpenAPI Spec)
Fitbit Body API (OpenAPI Spec)
Fitbit Device API (OpenAPI Spec)
Fitbit Foods API (OpenAPI Spec)
Fitbit Friends API (OpenAPI Spec)
Fitbit Glucose API (OpenAPI Spec)
Fitbit Heart API (OpenAPI Spec)
Fitbit Heart Rate API (OpenAPI Spec)
Fitbit Meals API (OpenAPI Spec)
Fitbit Profile API (OpenAPI Spec)
Fitbit Sleep API (OpenAPI Spec)
Fitbit Subscription API (OpenAPI Spec)

Flickr
Flickr (pronounced flicker) is an image hosting and video hosting website, and web services suite that was created by Ludicorp in 2004 and acquired by Yahoo in 2005. In addition to being a popular website for users to share and embed personal photographs, and effectively an online community, the service is widely used by photo researchers and by bloggers to host images that they embed in blogs and social media.

Flickr Activity API (OpenAPI Spec)
Flickr Authentication API (OpenAPI Spec)
Flickr Blogs API (OpenAPI Spec)
Flickr Cameras API (OpenAPI Spec)
Flickr Collections APIs (OpenAPI Spec)
Flickr Commons API (OpenAPI Spec)
Flickr Contacts API (OpenAPI Spec)
Flickr Favorites API (OpenAPI Spec)
Flickr Galleries API (OpenAPI Spec)
Flickr Groups API (OpenAPI Spec)
Flickr Interestingness aPI (OpenAPI Spec)
Flickr Machine Tags API (OpenAPI Spec)
Flickr Panda API (OpenAPI Spec)
Flickr People API (OpenAPI Spec)
Flickr Photos API (OpenAPI Spec)
Flickr Photosets API (OpenAPI Spec)
Flickr Places API (OpenAPI Spec)
Flickr Preferences API (OpenAPI Spec)
Flickr Push API (OpenAPI Spec)
Flickr Reflection API (OpenAPI Spec)
Flickr Stats API (OpenAPI Spec)
Flickr Tags API (OpenAPI Spec)
Flickr Test API (OpenAPI Spec)
Flickr URLs API (OpenAPI Spec)

Foursquare
Foursquare is a geographical location based social network that incorporates gaming elements.nbsp; Users share their location with friends by ldquo;checking inrdquo; via a smartphone app or by text message. Points are awarded for checking in at various venues. Users can connect their Foursquare accounts to their Twitter and Facebook accounts, which can update when a check in is registered. By checking in a certain number of times, or in different locations, users can collect virtual badges. In addition, users who have checked in the most times at a certain venue will be crowned ldquo;Mayorrdquo; until someone surpasses their number. Various venues have embraced Foursquare, and offer special deals to users who are ldquo;mayorsrdquo;.

Foursquare (OpenAPI Spec)
Foursquare Merchant (OpenAPI Spec)

GitHub
GitHub is a social network for programmers. Git is a distributed software management program created by Linus Torvalds, originally for the Linux Kernel Development. GitHub is a hosted Git repository. Github allows you to take part in collaboration by forking projects, sending and pulling requests, and monitoring development.

Github Accounts API (OpenAPI Spec)
Github Events API (OpenAPI Spec)
Github Gists API (OpenAPI Spec)
Github Issues API (OpenAPI Spec)
Github Networks API (OpenAPI Spec)
Github Organzations API (OpenAPI Spec)
Github Reports API (OpenAPI Spec)
Github Repositories API (OpenAPI Spec)
Github Teams API (OpenAPI Spec)
Github Users API (OpenAPI Spec)

Gmail
The Gmail API is a RESTful API that can be used to access Gmail mailboxes and send mail. For most web applications (including mobile apps), the Gmail API is the best choice for authorized access to a users Gmail data.

Gmail API (OpenAPI Spec)

Google Adsense
AdSense is a free, simple way to make money online by placing ads on your website. Ads are reviewed to ensure they're high quality and relevant to your content or audience, even when viewed on smartphones and tablets. The result? You can make more money online.

Google AdSense Host API (OpenAPI Spec)
Google AdSense Management API (OpenAPI Spec)

Google Analytics
Google Analytics gives you the digital analytics tools you need to analyze data from all touchpoints in one place, for a deeper understanding of the customer experience. You can then share the insights that matter with your whole organization.

Google Analytics API (OpenAPI Spec)

Google Calendar
The Calendar API lets you display, create and modify calendar events as well as work with many other calendar-related objects, such as calendars or access controls. This document describes how to use RESTful calls and client libraries for various programming languages (Java, PHP, .NET, JavaScript, NodeJs, Ruby, Python, Go, Android, iOS).

Google Calendar API (OpenAPI Spec)

Google Drive
Google Drive is a file storage and synchronization service operated by Google. It allows users to store files in the cloud, synchronize files across devices, and share files. Google Drive encompasses Google Docs, Sheets and Slides, an office suite that permits collaborative editing of documents, spreadsheets, presentations, drawings, forms, and more.

Google Drive API (OpenAPI Spec)

Google Maps
Google Maps is a web mapping service developed by Google. It offers satellite imagery, street maps, 360deg; panoramic views of streets, real-time traffic conditions, and route planning for traveling by foot, car, bicycle, or public transportation.

Google Sheets
Google Sheets is an online spreadsheet app that lets users create and format spreadsheets and simultaneously work with other people. Google Sheets isnrsquo;t only for consumers: its used every day by businesses and schools to manage spreadsheet data. With the new Sheets API v4 and Sheets add-ons, that data can be accessed by code as well as users.

Google Sheets API (OpenAPI Spec)

Google Translate
Cloud Translation API provides a simple programmatic interface for translating an arbitrary string into any supported language. Translation API is highly responsive, so websites and applications can integrate with Translation API for fast, dynamic translation of source text from the source language to a target language (e.g., French to English). Language detection is also available In cases where the source language is unknown. The underlying technology pushes the boundary of Machine Translation and is updated constantly to seamlessly improve translations and introduce new languages and language pairs.

Google Translate API (OpenAPI Spec)

Guardian Data
The Guardian is a British national daily newspaper which has grown into a national paper associated with a complex organisational structure and an international multimedia and web presence. The Guardian provides API access to articles accessible by tag and section, and a suite of open source data and tools. The Guardian makes content accessible to increase traffic, brand awareness, and as a marketing vehicle, including partnership opportunities via platform program.

Guardian Content API (OpenAPI Spec)