Fulgur Ventures leads the round as Foundation opens Passport Prime to general sale and makes its KeyOS developer platform available to outside developers.
Foundation today announced a $6.4 million funding round led by Fulgur Ventures and joined by Arche Capital, alongside the general availability of Passport Prime and expanded access to the KeyOS developer platform. The round brings Foundation's total funding to $16.5 million and accelerates the company's expansion from Bitcoin self-custody into identity, multi-factor authentication, and AI agent authorization.
Passport Prime began shipping to pre-order customers in March. With today's general availability, it is open to all buyers for the first time. The device is the first entry in a category Foundation has trademarked as Human Authority Hardware, dedicated, American-manufactured security devices that ensure high-stakes digital decisions require explicit human approval on hardware that no compromised software environment can reach.
The problem is no longer just key storage. AI agents can now act across accounts, wallets, cloud infrastructure, and enterprise systems at machine speed. A browser prompt, phone notification, or policy engine running on the same computer as the agent cannot be the final authority for a consequential action. Before money moves, code deploys, credentials are used, or sensitive data is accessed, the human should be able to review and approve the action on a trusted device they hold.
"Every era has its key management problem. For Bitcoin it was self-custody. For the agentic era it is who actually authorizes the decisions an AI agent takes on someone's behalf," said Zach Herbert, cofounder and CEO of Foundation. "That question cannot be answered by the same computer running the ...
