| API | Description | Category | Updated |
|---|---|---|---|
| Yahoo Messenger | Instant messaging | Chat | 2006-06-21 |
| Yahoo Mobile Widget Platform | Mobile widget platform | Widgets | 2008-01-07 |
| Yahoo Music | Music and musician info and videos | Music | 2008-08-04 |
| Yahoo Music Engine | Desktop music player | Music | 2005-11-09 |
| Yahoo My Web Search | Personalized search services | Search | 2006-10-20 |
| Yahoo Network Time | Yahoo server time service | Tools | 2012-06-22 |
| Yahoo Notifications | Notification functionality for Yahoo accounts | Messaging | 2011-07-18 |
| Yahoo PlaceFinder | Geocoding of named places | Mapping | 2010-06-22 |
| Yahoo Placemaker | Geo-enrichment service | Mapping | 2009-05-20 |
| Yahoo Query Language | Query language platform for Yahoo services | Database | 2008-12-05 |
| Yahoo Related Suggestions | Search suggestion service | Search | 2006-03-10 |
| Yahoo Search | Search services | Search | 2006-02-14 |
| Yahoo Search Marketing | Search advertising platform | Advertising | 2007-06-04 |
| Yahoo Shopping | Shopping services | Shopping | 2005-11-19 |
| Yahoo Site Explorer | Web site analysis service | Internet | 2007-02-01 |
| Yahoo Social Directory | Yahoo profile directory service | Social | 2010-10-13 |
| Yahoo Spelling Suggestion | Spelling correction service | Reference | 2010-02-15 |
| Yahoo Status | Yahoo account status | Blogging | 2011-07-18 |
| Yahoo Term Extraction | Contextual search service | Search | 2005-11-19 |
| Yahoo Traffic | Traffic data and routing | Transportation | 2005-11-19 |
| Yahoo Travel | Online travel services | Travel | 2005-12-21 |
| Yahoo Updates | Social network aggregation | Tools | 2009-03-10 |
| Yahoo Video Search | Video search | Video | 2005-11-19 |
| Yahoo Weather | Weather data service | Weather | 2009-12-04 |
| Yahoo WebPlayer | Web media player | Video | 2011-08-04 |
| Yahoo Widgets | Desktop widgets | Widgets | 2006-09-30 |
| Yahoo Wretch | Photo and blog hosting services | Social | 2012-06-27 |
| Yahoo YUI | Web visualization and layout framework | Internet | 2012-01-05 |
| Yamli | Arabic search engine using Latin characters | Search | 2008-08-25 |
| Yammer | Microblogging for business | Social | 2008-09-17 |
| Yandex | Russian search engine | Search | 2007-09-16 |
| Yandex Bar | Create components for internet browsers | Internet | 2011-02-28 |
| Yandex Blog Search | Blog search service | Search | 2011-02-22 |
| Yandex Detektor | Detect type of users mobile device | Internet | 2011-02-28 |
| Yandex Direct | Contextual advertising service | Advertising | 2011-02-22 |
| Yandex Fotok | Photo sharing service | Photos | 2011-02-22 |
| Yandex Maps | Online mapping service | Mapping | 2011-02-22 |
| Yandex Metrica | Site metrics service | Internet | 2013-02-25 |
| Yandex MoiKrug | Yandex Social Network Service | Social | 2011-03-31 |
| Yandex Money | Online payment system | Payment | 2013-02-25 |
| Yandex Podpiski | RSS feed subscription service | Feeds | 2011-02-28 |
| Yandex Rich Content | Webpage metadata delivery tool | Internet | 2013-02-27 |
| Yandex Server | Online full text search service | Search | 2011-02-28 |
| Yandex Speller | Find and fix spelling mistakes | Tools | 2011-02-28 |
| Yandex Translate | Free text translation service | Tools | 2013-02-25 |
| Yandex Webmaster | Yandex-specific search engine optimization tools | Internet | 2013-02-25 |
| Yandex Ya.ru | Blogging platform | Blogging | 2011-02-28 |
| Yapta | Airfare Tracking Service | Travel | 2011-04-05 |
| Yast | Time tracking and project management service | Project Management | 2011-12-02 |
| Yebol | Semantic search engine | Search | 2009-10-20 |
| Yellow | Canadian business listings service | Search | 2010-09-17 |
| YellowBot Location | Local business search service | Recommendations | 2011-01-06 |
| YellowBot Reputation Management | Local business search service | Search | 2011-01-06 |
| Yellowfin Business Intelligence | Business intelligence reporting and dashboarding service | Enterprise | 2012-05-11 |
| Yelp | Local user reviews and city guides | Recommendations | 2007-08-03 |
| Yendo Accounts | Online accounting software | Financial | 2010-11-02 |
| Yes Broadcast DB | Radio station search, now-playing, logs and charts | Music | 2008-11-06 |
| Yes-co | Dutch real estate project management service | Real Estate | 2012-06-28 |
| YesMail | Email marketing campaign service | 2012-02-22 | |
| YESpay | Card payment services | Payment | 2012-04-04 |
| Yext | Marketing messaging service | Advertising | 2013-03-03 |
| yfrog | Photo sharing and social networking platform | Photos | 2012-08-03 |
| Yi.tl | URL shortener with stats | Tools | 2012-05-17 |
| Yiftee GiftUp | Gift giving service for applications | Shopping | 2013-02-06 |
| YIFY-Torrents | Movie torrent site | File Sharing | 2013-05-23 |
| YikeSite | Web content management system | Enterprise | 2012-09-11 |
| Yipit | Local coupon aggregation service | Shopping | 2010-12-20 |
| YippieMove | Email migration service | 2012-10-26 | |
| YLink | SMS messaging and fax service | Messaging | 2012-03-22 |
| Yodaspeak | Text translation service | Entertainment | 2012-06-04 |
| Yodlee FinApp Store | Money management platform | Financial | 2010-10-25 |
| Yolink | Semantic search | Search | 2010-07-11 |
| Yonda4 | Reading lists and recommendations | Recommendations | 2011-05-25 |
| YoolinkPro | Corporate social networking platform | Enterprise | 2011-04-14 |
| YorApi | API creation service and platform | Backend | 2011-11-22 |
| York University Library | University library data service | Reference | 2012-11-08 |
| Yospace | Mobile video platform and service | Video | 2011-10-11 |
| Yottaa Partner | Website performance and optimization service | Internet | 2012-01-25 |
| Yottaa Public | Website performance and optimization service | Internet | 2012-01-25 |
| Yottaa User | Website performance and optimization service | Internet | 2012-01-25 |
| YottaShare | Multi-service URL un-shortener | Tools | 2010-08-19 |
| youcantcall.us | Reject unwanted phone calls | Telephony | 2011-04-15 |
| YouMail | Visual voicemail services | Telephony | 2012-04-12 |
| Young Belfius | Belgian money management services for young adults | Financial | 2013-04-18 |
| YouOS | Web based operating system | Internet | 2008-05-14 |
| YouPage | Business and local events directory | Shopping | 2008-11-16 |
| Your Book Launch | Book launch management service | Social | 2012-06-12 |
| Your Mapper | Local Geodata For Your Apps | Mapping | 2009-08-21 |
| YourMembership | Membership organization management service | Social | 2012-02-29 |
| yourminis | Widget Platform | Widgets | 2007-04-03 |
| youRoom | Group messaging service | Messaging | 2011-09-22 |
| YourStreet | Geocoding news article service | News | 2009-01-24 |
| YouSendIt | File storage/sharing service | File Sharing | 2011-11-08 |
| YouTargets | Web based CRM | Office | 2012-11-19 |
| YouTrack | Issue and bug tracker | Tools | 2012-07-31 |
| YouTube | Video sharing and search | Video | 2006-02-08 |
| YouTXT | SMS text messaging service | Messaging | 2008-02-24 |
| YOYOIndia | Indian social network | Social | 2009-03-26 |
| YRC | Package shipping services | Shipping | 2008-09-03 |
| Yubikey | Cloud-based authentication and validation service | Security | 2012-01-31 |
| YuMe AFP | Target video advertising platform and network | Video | 2012-08-21 |
| Yummly | The Largest Semantic Food and Recipe Search API | Search | 2011-04-23 |
| YUPIQ | Social media promotions platform | Advertising | 2012-07-25 |
| Z33K Tournament API | Online gaming tournament platform | Games | 2012-02-22 |
| Zaarly | Local commerce platform | Shopping | 2012-07-17 |
| Zacks Financial Data | Investment research service | Financial | 2011-06-20 |
| Zannel Open | Community site | Social | 2008-03-16 |
| zanox | Internet monetization services | Advertising | 2008-11-15 |
| Zapier | Application integration service | Tools | 2012-06-26 |
| Zapier Status | Dashboard of API status information | Utility | 2013-05-06 |
| Zappos | Online retail store | Shopping | 2010-06-17 |
| Zatune | Music | 2011-06-24 | |
| Zaypay | Micropayments via SMS services | Payment | 2008-05-11 |
| Zazzle | On-demand product creation service | Shopping | 2006-08-31 |
| ZEDO | Online advertising service | Advertising | 2011-11-29 |
| ZeeMaps | Embedded maps and international geocoding | Mapping | 2006-02-23 |
| Zeep Mobile | SMS text messaging service | Messaging | 2008-09-01 |
| Zeevex Game Wallet | Virtual currency for online gaming | Payment | 2012-11-19 |
| ZEIT ONLINE | German newspaper search | News | 2012-11-30 |
| Zeitin Vidi | Streaming video service | Video | 2012-01-24 |
| Zemanta | Blog authoring extension services | Blogging | 2008-07-20 |
| Zen | Personal project managment service | Project Management | 2010-03-09 |
| Zenbu | New Zealand search and business directory service | Search | 2012-01-16 |
| Zencoder | Online video transcoding service | Video | 2010-05-06 |
| Zendesk | Help desk service | Internet | 2009-06-08 |
| Zenfolio | Photo sharing platform | Photos | 2010-12-08 |
| Zeo Sleep Measurement | Individual sleep records service | Other | 2010-10-04 |
| Zerigo Managed DNS | DNS management service | Internet | 2010-12-16 |
| Zerista | Event intelligence platform | Events | 2012-07-12 |
| Zeta Uploader | Large file sharing service | File Sharing | 2013-04-03 |
| ZetaPrints | Web-to-print and imaging service | Tools | 2012-06-18 |
| zferral | Customized affiliate and referral programs | Shopping | 2010-10-28 |
| ZhoutIt | Local discovery service | Messaging | 2010-12-29 |
| Zijob | French job search service | Job Search | 2010-03-26 |
| Zillow | Real estate pricing and valuations and mortgage rates | Real Estate | 2006-10-26 |
| ZimageZ | Image hosting service | Photos | 2011-08-12 |
| Zinc | Shipping service for online retailers | Shipping | 2012-12-31 |
| Zinc.tv Remote Control | Remote control service for online media | Video | 2012-06-04 |
| ZingChart | Flash or HTML5 charting and graphing service | Utility | 2012-05-01 |
| ZIP Codes | Zip code lookup service | Reference | 2009-12-08 |
| Zip Tax | Sales tax information by zip code | Retail | 2012-05-14 |
| ZipCodes | Simple zip code lookup service | Other | 2005-10-31 |
| ZipFeeder | Zip code information service | Tools | 2012-06-07 |
| ZIPFOURce | U.S. address validation and standarization service | Mapping | 2011-11-30 |
| Zipmark | Online and mobile payment service | Payment | 2012-02-28 |
| ZipPlease | Zip file creation service | Tools | 2012-10-25 |
| Zippopotamus | Zip and postal code service | Mapping | 2012-04-26 |
| Zipster | Australian job search site | Job Search | 2010-11-15 |
| Ziptastic | Address field population tool | Tools | 2012-04-12 |
| Zixxo | Online coupons | Shopping | 2006-07-29 |
| zKillboard | Killboard service for Eve Online | Games | 2013-05-01 |
| ZNISMS DND Checker | India Do Not Disturb registry checker | Telephony | 2011-11-21 |
| ZNISMS SMS | Single and Bulk SMS service | Messaging | 2011-09-01 |
| Zoho | Online office suite | Office | 2006-12-01 |
| Zoho CRM | Customer relationship management services | Financial | 2009-01-27 |
| Zoho Invoice | Online invoicing service | Financial | 2010-04-21 |
| Zoho Projects | Project management and collaboration service | Office | 2009-12-10 |
| Zoho Recruit | Applicant tracking system | Enterprise | 2010-08-04 |
| ZoinkIT | Free service for caching torrent files online | File Sharing | 2013-05-24 |
| Zomato | India Restaurant and lifestyle guide | Food | 2011-09-16 |
| Zong | Mobile payments for web publishers | Payment | 2010-03-31 |
| Zoo Property | Real estate and property information service | Real Estate | 2012-12-11 |
| ZooBank | Registry of zoological nomenclature | Science | 2013-01-30 |
| Zoom.it | Photo conversion and sharing service | Photos | 2010-12-17 |
| Zoombu Fly | Travel search service | Travel | 2010-10-11 |
| ZoomClouds | Tag cloud service | Other | 2006-03-01 |
| ZoomIn | New Zealand mapping service | Mapping | 2006-05-10 |
| ZoomInfo | Information search services | Reference | 2007-09-27 |
| ZoomRank | SEO rank monitoring service | Internet | 2010-12-17 |
| Zooomr | Photo and text message sharing service | Photos | 2008-07-13 |
| Zoopla | Property and real estate search engine | Real Estate | 2011-10-18 |
| ZooProperty | Real estate listings and data hub | Real Estate | 2011-06-14 |
| Zoopy | Online and mobile social media community | Social | 2010-03-26 |
| Zootle | Sales, inventory, and contact management service | Enterprise | 2013-01-18 |
| Zootool | Online Bookmarking and Collecting Service | Bookmarks | 2011-02-03 |
| ZooZ | Mobile payments service | Payment | 2012-06-04 |
| Zopim Chat | Live chat widget | Chat | 2011-07-26 |
| Zotero | Research citation organization service | Bookmarks | 2010-12-29 |
| Zoto | Photo sharing service | Photos | 2006-03-01 |
| Zubhium | Android application management platform | Backend | 2013-05-22 |
| Zubka | Job board and referral service | Job Search | 2008-03-01 |
| Zugmonitor | Germain railway information service | Transportation | 2012-03-22 |
| Zumbox | Digital postal mail service | Other | 2011-08-12 |
| Zuora | Subscription billing service | Financial | 2009-02-24 |
| Zuppler | Online Menu and Ordering Service | Food | 2012-11-21 |
| Zutual | Twitter user comparison service | Social | 2009-12-10 |
| Zutual | Twitter analysis service | Social | 2010-01-14 |
| Zvents | Local events search and community | Events | 2006-02-14 |
| Zvtra.ru | Bookmarking Service | Bookmarks | 2011-04-01 |
| Zwiggo | Social networking for groups | Social | 2011-11-15 |
| Zyncro | Enterprise social networking service | Enterprise | 2012-05-30 |
| Zynga | Developer platform for social games | Games | 2008-02-14 |
| Zypr | API aggregation service | Other | 2011-11-08 |
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