Sweeper bot

An automated program run by a thief who holds the private key or seed phrase of a victim’s address. It watches the address, often through the mempool, and transfers out any incoming native coin immediately, usually by outbidding on fees. Because the victim cannot keep the coin needed to pay fees, tokens and other assets left at the address become impossible to move by ordinary means.

• Rescues typically rely on private order flow: the funding transaction and the rescue transfers are submitted together as a bundle, so they are executed in the same block without ever appearing in the public mempool.