x402 and MPP let an agent pay for a request without an account. That is a real step forward. But most API sellers I talk to still ask the same thing: who is this agent, and who do I contact when something goes wrong? Today there are roughly three ways an agent ends up using a paid API: Option 1. A human signs up and pastes a key into the agent. The seller gets a known customer. The agent is blocked by every service its owner has not set up yet. Option 2. The agent pays anonymously per request...