The address you followed does not match anything we publish.
What happened
Either the address is wrong, or the trade package it pointed at is no longer on the shelf. A package leaves the Opportunity Index when it is sold, when its deadline passes, or when the published record behind it changes enough that we will not sell it any more. We do not keep a page for a package we would not sell you.
What is safe
Nothing has been charged and nothing about your account has changed. A wrong address reaches no data at all.