Inkbox now hosts the agent as well as its accounts. Builders give an agent its own email, phone number, iMessage, WhatsApp, Slack, and agent-to-agent address, then run it on a cloud computer tied to that identity. Messages it is set to handle wake it even if it was asleep. When the queue is empty it sleeps, keeping files, history, and scheduled jobs so the team does not pay for downtime. Teams choose the harness, write the instructions, and set who the agent may talk to and which events are allowed to wake it. Sending was already a single API call. The harder problem is a reply that lands an hour later or the next morning, after the process that should read it has stopped. Hosted agents are for teams that need an agent to email customers, take calls, or work in Slack without someone keeping a server online. Four months after its Y Combinator Summer 2026 launch, Inkbox says it has processed millions of messages for agents. The company announced a $5.3 million seed led by Peak XV, with Pioneer Fund, Y Combinator, and angels including Guillermo Rauch, Henri Stern, Jonathan Frankle, Cristina Cordova, and Dan Levine. Inkbox is a three-person team in San Francisco, founded by Ray Liao, Alex Wilcox, and Dima Vremenko. Liao, the CEO, holds a computer science PhD from MIT.