In the API Access section, generate a new key with only the Account balance permissions.
Copy and paste your Key and Secret, along with your CEX.io username, into the "Add new Exchange" form, and click "Add account".
You must first activate the API key; once copying your Key and Secret, click on "Activate" to activate the key.
You will receive a confirmation e-mail from CEX.io; click on this link to complete the key activation.
The Secret for your key will now be hidden. Finally, click "Add Account" on the completed "Add new Exchange" form.
Is it safe to provide CryptFolio a CEX.io API key?
You need to make sure that the API key only has the Account balance permission. This should
mean that the API key can only be used to retrieve account status, and it should not be possible
to perform trades or withdraw funds using that key.
Your CEX.io keys and secrets will never be displayed on the CryptFolio site, even if you have logged in.
Through the CEX.io interface you can revoke an API key's access at any time by clicking Delete.