The ITF ShipBeSure website is part of a campaign to stop scam job adverts that target seafarers for money. You can check whether or not the agency is real and report any that are fake. You can also confirm legitimate manning agencies. There is a full guide for seafarers.
For more details click https://www.itfglobal.org
You can access the web tool directly by clicking on this link: https://www.itfshipbesure.org/