Mastercard announced agents paying at machine speed. What's the first use case that actually needs that?

Mastercard shipped Agent Pay for machines this month, agents paying other agents directly, 30 plus partners, settlement in seconds. Their own framing for it is machine speed and always on. Most of the discussion I see on this is about limits and trust, how little you'd hand an agent and what happens when it spends wrong. Fair, but that's the same conversation we've had about every payment tool in general, and people already cap agents at what they're willing to lose. That part feels handled (for now). What I’m more interested in is the use case that actually needs an agent paying at machine speed, the thing a person with a card just can't pull off. The consumer version is grabbing a limited clothing drop the millisecond it lists, or holding your place in an online ticket queue the second it opens. The machine version is an agent firing thousands of tiny per call payments a second for live trading or metered data, which isn't really a human action at all. That's the part nobody's demoing, and I think it's the only part that justifies building machine speed rails to begin with (I could be wrong). For people building on this, what's the first use case you've actually seen that needs an agent paying faster than a person ever could?