Yandex DataSync API Terms of Use

YANDEX Limited Liability Company (hereinafter referred to as Yandex) offers an Internet user (hereinafter referred to as the User) to use its Yandex DataSync API Service on the terms outlined herein (hereinafter referred to as the Terms).

1. General Provisions

1.1. Terms and Definitions

Service: Yandex DataSync API Service, which is a programming interface enabling the User to upload, store, synchronize versions of and delete Data.

Application: software and/or a service provided by the User in the Internet and available for free open use by the public.

Data: information about the Application users, collected by the User providing the Application and published by the User using the Service.

Database: a set of Data marked by the User as pertaining to one Application.

1.2. When using the Service, the User shall comply with these Terms as well as with:

1.2.1. User Agreement for Yandex Services available at:;

1.2.2. Privacy Policy available at:

1.3. By starting to use the Service or its individual functions, creating a user account in the Service, publishing the service code in his Application or employing any other functional optionality offered by the Service, the User shall be understood to have agreed to these Terms as well as to the terms and conditions of all the documents referred to in Clause 1.2 of the Terms, to the full extent and without any reservations or exceptions, and undertakes to abide by the foregoing. Using the Service on terms other than the terms and conditions of the specified documents may be allowed exclusively upon prior written consent of Yandex. If the User does not agree to any of the terms and conditions of the specified documents, the User may not use the Service.

1.4. The User shall be responsible at his discretion for complying with the Legislation when using the Service. Throughout the text hereof, unless expressly stated to the contrary, the term “Legislation” shall imply any applicable legislation, including the legislation of the Russian Federation as well as the legislation at the User’s whereabouts, at the whereabouts of the Application user, and/or the place where the User performs legally significant acts (including collection of and other operations related to the processing of the Data) in accordance with these Terms. If, by using any option offered by the Service, the User breaches the Legislation, the User shall refrain from using the Service.

1.5. These Terms and relationships arising between Yandex and the User in connection with the use of the Service shall be subject to the laws of the Russian Federation.

2. Terms of the Use of the Service

2.1. In order to obtain access to the Service, the User shall register the Application according to the established form at Yandex may deny the access to the Service at its discretion without giving any reason. The User may not use any programmes, devices or other facilities enabling them to get an OAuth token automatically or otherwise in violation of the procedure established by Yandex.

2.2. The User may not use the Service for publishing Data of projects requiring payment or otherwise restricting the public access thereto. The registration requirement shall not be deemed as an access restriction in the context hereof.

2.3. The User may use the data and the functions obtained with the use of the Service solely within the scope of the functionality offered by the Service.

2.4. When using the Service, the User shall provide for a reference to the Yandex technology by incorporating in the Application description the Yandex logo and the notice “implemented with the use of the Yandex DataSync technology”. When using the Service, the User may not delete, hide or modify any trademarks, logos, references to or other mentionings of Yandex or other parties, contained in or received with the use of the Service, including any other notices and/or information transmitted by the Service. When using the Yandex logo in the manner set out herein, the User shall abide by the rules available at all times in the Internet at

2.5. The User may not change, decompile and/or otherwise modify the source code obtained with the use of the Service.

2.6. In case of excess of the maximum Service hits – 40 (forty) requests per second, the maximum possible number of Databases per user – 10 (ten) Databases, the maximum Database volume – 10 (ten) megabytes, the Service access may be restricted or discontinued.

2.7. The User may not use the Service for the purpose of creating or ensuring performance of Applications capable of performing any functions breaching the Legislation, the rules of the documents specified in Clause 1.2 of the Terms, and/or rights and legitimate interests of third parties.

2.8. The User is hereby notified and agrees that Yandex may obtain data on the number of end users of the Application and use such data for statistics collection and analysis. Anonymized data not identifying the User and/or the Application may be published by Yandex or disclosed to third parties without securing the User’s consent.

2.9. Yandex reserves the right to change, revise or update the Service at any time, without any prior notice to the User. When releasing the next stable version, Yandex shall announce its release on the Web pages of the Service. After releasing an updated version of the Service, Yandex shall not guarantee the stability and running operation of the out-of-date versions. If the User does not agree to use an updated version of the Service, the User may continue using the out-of-date version of the Service at their own risk and peril or discontinue the use of the Service.

2.10. Yandex reserves the right to incorporate advertising materials in the Data at its discretion. When using the Data, the User may not delete, change or hide such advertising materials without consent of Yandex. The rules set out in this clause shall create no advertising legal relationships between the User and Yandex and may not be deemed, inter alia, as an order or provision of advertising services.

3. Intellectual Rights

3.1. The exclusive right to the Service shall belong to Yandex. The exclusive rights to the Data shall belong to the User. These Terms shall not grant the User any rights to use the Service or the Data in addition to the options directly offered in the Service interface and in pursuance hereof.

3.2. By using the Service, the User shall authorize Yandex to use the logo, trademark and/or brand name of the User and/or the User’s Web site for informational, advertising and marketing purposes, without having to obtain any additional consent of the User and without paying the User any fee for such use.

4. Disclaimer

4.1. The Service (including the Data) shall be provided by Yandex ‘as is’. Yandex shall provide no guarantee as to the consistency of the Service and the Data with the User’s goals and expectations, uninterrupted or errorfree operation of the Service on the whole and its individual components and/or functions, and/or as to the reliability, accuracy, completeness and timeliness of the Data. Yandex shall not guarantee uninterrupted errorfree operation of thirdparty software products or solutions (including libraries) recommended to be used in the Service in technical conditions and other documents relating to its use.

5. Final Provisions

5.1. Yandex may at any time without any notice discontinue or suspend at its discretion the User’s access to the Service or its individual functions by using his account and/or OAuth token, without giving any reason, specifically, if the User breaches the requirements set out herein.

5.2. All questions and complaints in connection with the use of/impossibility to use the Service shall be submitted via a feedback form available at

5.3. Yandex may at any time without any notice to the User amend the text of these Terms. The current version of these Terms shall be published at: A revised version of the Terms shall take effect as of its publication in the Internet at the address specified herein. The continued use of the Service upon amendment of the Terms shall be deemed as the agreement to the revised version hereof. The User shall discontinue using the Service if the User does not agree to any amendments made by Yandex.