To get started with the .NET client library, find the API you want to use and click the desired version number:
| APIs Discovery Service | v1 | Lets you discover information about other Google APIs, such as what APIs are available, the resource and method details for each API. | |
| Ad Exchange Buyer API | v1.3 | Lets you manage your Ad Exchange Buyer account. Other versions: v1.2, v1.1, v1 |
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| Ad Exchange Seller API | v1.1 | Gives Ad Exchange seller users access to their inventory and the ability to generate reports Other versions: v1 |
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| AdSense Host API | v4.1 | Gives AdSense Hosts access to report generation, ad code generation, and publisher management capabilities. | |
| AdSense Management API | v1.4 | Gives AdSense publishers access to their inventory and the ability to generate reports Other versions: v1.3, v1.2 |
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| Admin Directory API | directory_v1 | The Admin SDK Directory API lets you view and manage enterprise resources such as users and groups, administrative notifications, security features, and more. | |
| Admin Reports API | reports_v1 | Allows the administrators of Google Apps customers to fetch reports about the usage, collaboration, security and risk for their users. | |
| BigQuery API | v2 | A data platform for customers to create, manage, share and query data. | |
| Blogger API | v3 | API for access to the data within Blogger. Other versions: v2 |
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| Books API | v1 | Lets you search for books and manage your Google Books library. | |
| Calendar API | v3 | Lets you manipulate events and other calendar data. | |
| Cloud SQL Administration API | v1beta3 | API for Cloud SQL database instance management. Other versions: v1beta1 |
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| Cloud Storage API | v1beta2 | Lets you store and retrieve potentially-large, immutable data objects. Other versions: v1beta1 |
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| Compute Engine API | v1 | API for the Google Compute Engine service. Other versions: v1beta16 |
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| CustomSearch API | v1 | Lets you search over a website or collection of websites | |
| DFA Reporting API | v1.3 | Lets you create, run and download reports. Other versions: v1.2, v1.1, v1 |
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| DoubleClick Bid Manager API | v1 | API for viewing and managing your reports in DoubleClick Bid Manager. | |
| DoubleClick Search API | v2 | Report and modify your advertising data in DoubleClick Search (for example, campaigns, ad groups, keywords, and conversions). | |
| Drive API | v2 | The API to interact with Drive. Other versions: v1 |
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| Email Migration API v2 | email_migration_v2 | Email Migration API lets you migrate emails of users to Google backends. | |
| Enterprise Apps Reseller API | v1 | Lets you create and manage your customers and their subscriptions. Other versions: v1sandbox |
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| Enterprise Audit API | v1 | Lets you access user activities in your enterprise made through various applications. | |
| Enterprise License Manager API | v1 | Licensing API to view and manage license for your domain. | |
| Freebase Search | v1 | Find Freebase entities using textual queries and other constraints. Other versions: v1sandbox, v1-sandbox |
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| Fusion Tables API | v1 | API for working with Fusion Tables data. | |
| Google Affiliate Network API | v1beta1 | Lets you have programmatic access to your Google Affiliate Network data. | |
| Google Analytics API | v3 | View and manage your Google Analytics data Other versions: v2.4 |
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| Google App State API | v1 | The Google App State API. | |
| Google Civic Information API | us_v1 | An API for accessing civic information. | |
| Google Cloud Datastore API | v1beta2 | API for accessing Google Cloud Datastore. Other versions: v1beta1 |
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| Google Fonts Developer API | v1 | The Google Fonts Developer API. | |
| Google Identity Toolkit API | v3 | Help the third party sites to implement federated login. | |
| Google Maps Coordinate API | v1 | Lets you view and manage jobs in a Coordinate team. | |
| Google Mirror API | v1 | API for interacting with Glass users via the timeline. | |
| Google OAuth2 API | v2 | Lets you access OAuth2 protocol related APIs. Other versions: v1 |
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| Google Play Android Developer API | v1.1 | Lets Android application developers access their Google Play accounts. Other versions: v1 |
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| Google Play Game Services API | v1 | The API for Google Play Game Services. | |
| Google Play Game Services Management API | v1management | The Management API for Google Play Game Services. | |
| Google Site Verification API | v1 | Lets you programatically verify ownership of websites or domains with Google. | |
| Google Spectrum Database API | v1explorer | API for spectrum-management functions. | |
| Google+ API | v1 | The Google+ API enables developers to build on top of the Google+ platform. | |
| Google+ Domains API | v1 | The Google+ API enables developers to build on top of the Google+ platform. | |
| Groups Migration API | v1 | Groups Migration Api. | |
| Groups Settings API | v1 | Lets you manage permission levels and related settings of a group. | |
| Orkut API | v2 | Lets you manage activities, comments and badges in Orkut. More stuff coming in time. | |
| PageSpeed Insights API | v1 | Lets you analyze the performance of a web page and get tailored suggestions to make that page faster. | |
| Prediction API | v1.6 | Lets you access a cloud hosted machine learning service that makes it easy to build smart apps Other versions: v1.5, v1.4, v1.3, v1.2 |
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| QPX Express API | v1 | Lets you find the least expensive flights between an origin and a destination. | |
| Search API For Shopping | v1 | Lets you search over product data. | |
| TaskQueue API | v1beta2 | Lets you access a Google App Engine Pull Task Queue over REST. Other versions: v1beta1 |
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| Tasks API | v1 | Lets you manage your tasks and task lists. | |
| Translate API | v2 | Lets you translate text from one language to another | |
| URL Shortener API | v1 | Lets you create, inspect, and manage goo.gl short URLs | |
| YouTube Analytics API | v1 | Retrieve your YouTube Analytics reports. Other versions: v1beta1 |
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| YouTube Data API | v3 | Programmatic access to YouTube features. |