Inkbox

Inkbox is an AI agent identity tool that gives autonomous agents the real-world infrastructure they need to act: a real email address, a US phone number for calls and SMS, a permanent internet address for webhooks, and a zero-knowledge vault for logins, API keys, and cards, all tied to one persistent identity. The idea is that AI agents have the intelligence to do real work but lack the accounts and communication channels to actually carry it out, so Inkbox provides a single identity layer per agent. It integrates as a skill for coding assistants like Claude and Cursor, supports standalone agent self-signup, and offers plugins for agent frameworks such as Hermes and OpenClaw. The product is built for developers building AI agents that need to send and receive messages, handle verification flows, and store credentials securely. Inkbox is Y Combinator-backed and based in Cambridge, Massachusetts, with a console, documentation, and an llms.txt reference for machine onboarding. Pricing is not detailed on the homepage. For builders, the appeal is giving each agent a durable identity rather than reusing a developer's personal email and phone.

People use Inkbox to give AI agents a real email, phone number, webhook address, and credential vault under one persistent identity.