What Your UCP Trial Unlocks: From Grade C to Grade A in 15 Minutes Most stores with a UCP profile are stuck at Grade C. Their manifest loads. Agents can see them. But they cannot buy a single thing. Here is what changes when you fix the three fields every Grade C store is missing - and how a 7-day trial makes it a 15-minute job. The Grade C trap: visible, but not transactable A Grade C UCP profile means structural validity. Your /.well-known/ucp returns valid JSON. An AI shopping agent can discover your store. That feels like progress. But Grade C also means the agent hits a wall the moment it tries to do anything commercial. No payment handlers configured. No signing keys for verification. No return policy for the agent to communicate to the buyer. The agent walks away, and your store never knows it happened. We see this pattern constantly. In the last 7 days, 59 UCP profiles were validated on UCPtools. Eleven of those stores ran the AI Agent Simulator - a real end-to-end agent interaction test.…