Warframe's Terms of Use strictly prohibits buying, selling and/or transfer of your Warframe Account. Doing so will result in the immediate and permanent suspension of the account in question.
Our support staff will be unable to help or provide you with any form of financial reimbursement should you purchase an illicitly sold Warframe account.
If you come across a Warframe account being sold or transferred, please contact our support as soon as possible. We will be taking actions by permanently suspending the account to prevent any unwanted transactions.
For more information on our Terms Of Use, please see: https://www.warframe.com/terms
This document will be updated should any additional information on the subject arise.