We did an extensive review of each API, built off of them, and graded them based on the below items:
All APIs reviewed and considered so far:
Airbnb, Associated Press, Bazaarvoice, BBC, Best Buy, BetterDoctor, BigCommerce, Box.net, Braintree, British Airways, Cars.com, CartoDB, CBS Sports, Close.io, Demandware, DocPlanner, Dropbox, Edmunds, Etsy, Evernote, Expensify, FedEx, FerrisTV, Financial Times, Flickr, Flightview, Foursquare, Freshbooks, Gawker, Giphy, Greenhouse, GrubHub, Harper Collins, Hearst, Hubspot, Hyatt, IMDB, Instagram, Intercom.io, JustWorks, Klarna, Last.FM, LeagueApps, Levi Strauss, Lowe’s, Lyft, Macy’s, MailChimp, MailGun, Mapquest, Mapsense.co, Marks & Spencer, Merriam-Webster Dictionary, Mixpanel, MLB, Advanced Media, NewsCred, Nielsen, Nordstrom, NY Times, Optimizely, PaidEasy, Pandora, Paypal, Pinterest, Priority Payment Systems, PubNub, QuietLogistics, Reddit, Redfin, Salesforce, SeatGeek, Shopping.com, Shopzilla, Shutterstock, SendGrid, Soundcloud, Soundhound, Spotify, Square, Stripe, StubHub, Trulia, Tumblr, Twitch.tv, United Airlines, UPS, USA Today, USPS, Vice, Vimeo, Washington Post, WeatherBug, WhitePages, Wikipedia, WordPress, Yahoo Weather, Yellow Pages, Yelp, Zappos, Zazzle, Zenefits, Zillow, Zoho
Note: This list is constantly being updated and revised. We are reviewing new APIs weekly.