I received USDT from an unknown address. How do I check whether it's clean?
Two minutes: open oceanalt.com/en/check, paste the sender's address, and get a free result showing sanctions or scam list hits, mixer exposure, and whether its one-hop funding source is clean, with clickable evidence on every line. Then remember two things: "nothing found" never means guaranteed safe, and an unsolicited small transfer is often the opening move of a dusting scam, so never send anything back and never click links the sender gives you.
Why you got money out of nowhere
Three common causes: dusting (tiny amounts to tag active wallets for later phishing), the "sent by mistake, please return" scam (what arrived is fake or stolen funds and the refund address is the scammer's), and layering (using you as a pass-through). The response is the same: leave it alone, never send funds back, and keep the screening result on file to protect yourself.
If the amount is large or the sender keeps contacting you, keep records and talk to local law enforcement or a lawyer. The evidence links in a screening report document that you did your diligence.
Want to keep watching that address?
oceanalt.com/en/watch lets you subscribe to an address for free: you get an email when its risk status changes or it sends funds out. Nothing to install.
Where to start: free address check · API docs · watch an address
Boundary of everything above: a screening "clear" only means no match in the data held, never a safety guarantee; this page is not legal or compliance advice.