The revenue figure comes from the seller. Nothing on the open web reports what a site earns, so treat it as a claim to verify rather than a fact: ask for read access to analytics and to the ad or affiliate dashboard behind the number before you agree a price.

Deals go through an escrow agent. The buyer pays the platform. The seller transfers the domain, the hosting and the accounts. The seller is paid only after that. If the buyer disputes the handover, the escrow agent reads the chat and decides where the money goes.