you mean where it provides a bunker address to a caller?
i don't really know how bunkers work exactly, just the vague idea they involve ephemeral events and the relay acts as a middleman to pass the message between the signer and the client
Discussion
what i mean is, i'm pretty sure it is just a regular event so it goes through the /event endpoint that publishes events
the /relay endpoint could be used instead for this, but the ephemeral kind designation has the same effect (i just want to have an explicit call for relaying for future work, like the IRC like protocol i have in mind)