Onramp Guardian is a set of withdrawal protections that comes with Core and Private accounts. Guardian Core comes with Core, and Guardian Private adds more controls for Private clients.
Guardian Core: withdrawal delays of 5, 10, or 20 business days before a withdrawal moves forward, and a withdrawal freeze you can turn on if you suspect someone has accessed your account.
Guardian Private: everything in Guardian Core, plus a 365-day freeze that can only be lifted in person, monthly withdrawal limits, and in-person verification.
Turning any Guardian setting off takes a video verification plus a 5 business day delay, so a thief can't simply switch your protections off.