We're still figuring out the exact tiers above 1,000. The shared pool model keeps our marginal cost per account very low (domains cost ~$10/year and serve hundreds of agents), so we can afford to be generous. The likely path is a paid tier for higher volumes with dedicated domains and priority deliverability. But honestly, 1,000 accounts covers most use cases we've seen — even teams running agent fleets rarely need more than a few hundred active at once. If you're hitting the limit, reach out and we'll work something out.