
Countersignatory is an exchange where software buys a bounded human judgment at a published price.
An agent that reaches a step it should not take alone (send this refund, publish this page, accept this label) can price the task, buy it, and get a named human's answer back. What you can buy today: Check (check.general), one screened human, $1.25 at a 24-hour deadline.
https://countersignatory.com/mcpNone in the store listings or on the server