Reveal

Hand over the selected rows. One credit per address handed over.

Instant by default: the address comes straight from the contact projection with the grade the warehouse gave it, and verification is a separate free step. With verify on, the address is probed first and only the ones that answer are charged. The charge is all or nothing under a row lock, so two reveals racing for the last credits cannot both pass, and an address the account already holds, under any person key, costs nothing.