User Agreement
This Agreement governs the relationship between you (hereinafter, 'you' or the 'User') and YANDEX LLC (hereinafter, 'Yandex') with respect to your use of API functionality (hereinafter, 'API') on the Yandex.Direct service (hereinafter, the 'Service').
Yandex gives you the opportunity to use an API to create applications that directly interact with the Service and manage your advertising campaigns, as well as to use an API in other ways which do not contradict this Agreement. Use of an API within the context of the Service is governed by this Agreement, by the Service Offer located at the address http://direct.yandex.com/docs/ru/oferta.rtf, and by the User Agreement located at the address http://rules.yandex.ru/.
By using an API, you thereby expressly agree with all the conditions of this Agreement and of the aforementioned documents, and you undertake to observe them or to stop using API.
For the purposes of this Agreement, the following terms are used:
API Yandex.Direct - an interactive program interface between the User’s computer applications and the Yandex.Direct system.
Certificate - a digital document certifying the match between the key and information identifying the owner of the key. It contains information about the owner of the key, information about the public key, its designation and field of application, the name of the certification center, etc.
Private key - secret information used by the cryptographic algorithm when encoding/decoding communications, installing and testing the digital signature.
Conditions of using an API:
1.	Your security.
You bear responsibility for the safekeeping of your certificate and the secret key to it, as well as for everything that is done in the Service with the help of your certificate. All actions in the Service completed using your certificate and secret key are deemed to be done by you. You agree with this and you are obliged to inform Yandex immediately about any instance of unauthorized access (not permitted by you) using our certificate and/or any violation of security. Yandex is not responsible for the possible loss or damage to data that may occur due to a violation the provisions of this part of the User Agreement. Yandex requests that you to take all measures to ensure the security of the API.
2.	Automated access.
You agree that with the exception of the API itself, you are not allowed to use other means of automated access (robots, crawlers etc) for the Service.
3.	Monitoring.
You understand and agree that Yandex carries out monitoring of all the activity surrounding API use and can collect and analyze data on User actions performed with the help of an API.
4.	Guarantee of access.
You agree that the conditions of offering the Service (including API) are subject to change by Yandex at any time without prior notification to Users. Therefore, Yandex does not guarantee permanent access to the Service or any of its components. The Service is offered on an 'as is' basis. Yandex does not guarantee that the Service or its components (including the API) will meet the objectives and expectations of the User, nor does it guarantee its operation without failures or errors. Yandex does not bear responsibility for your actions or the actions of other Users made in the Service with the help of an API. Yandex does not compensate any damages, whether direct or indirect, caused to the User or to third parties as a result of using or being unable to use the Service or its separate components (including the API).
5.	Validity of the certificate.
You agree that Yandex can halt access to the API or close it completely, change the protocols and methods of access without explaining the reasons and without liability on its part. You are solely responsible for safeguarding all your data and must be ready to manage campaigns manually.
6.	Restrictions.
You agree that Yandex can at its discretion impose restrictions (quotas) on use of an API or its separate components depending on many factors including, but not limited to, the amount of services already rendered to the account managed by the given certificate, average CTR, whether there are advertisements that have been rejected by the moderators, etc.
The rules for applying such restrictions are described in the Q&A section: follow the link 'Manage your campaigns with Direct API' in the 'My campaigns' section of your account.
7.	Third parties.
In case you use an API to manage the campaigns of third parties on the basis of a contract or other agreement between you and them, you must understand that all data relating to the accounts of such clients, as well as other information concerning campaigns of such clients entered using your certificate is considered to be confidential and you do not have the right to use this data independently or to convey the data to third parties without the written agreement of the owners.
8.	Validity of this Agreement.
Yandex.Direct reserves the right to halt the validity of this Agreement if you do not fulfill its conditions. After this you must cease further use of the API.
9.	Final provisions.
This Agreement and all relationconnected with use of the Service and API are governed by the legislation of the Russian Federation.
All claims related to the use/inability to use an API within the context of the Service must be sent to the address api@direct.yandex.ru.
At any time and without notifying the User, Yandex may change the text of this Agreement and/or any other conditions of using the Service. The current text of this Agreement is available at the address: http://direct.yandex.com/docs/en/api_offer.rtf