I've been placing ads of me buying items on outpost with real money, but been wondering the following:

Since trading with money is (by nature) risky and mistrusting (because of reasons like undoing a transaction), am I allowed to say that they could place their items on websites like marketplace from which I'd then buy the items, or does it violate the website's rules when it comes to mentioning websites like such?

If I've made this post in the wrong place or have done wrong at posting this, please let me know.

Thank you in advanced.