StackOne

StackOne provides integration infrastructure for AI agents. Its platform offers pre-built connectors (560+ connectors and 34,000+ actions), managed authentication, an AI Connector Builder for custom connectors, an MCP-based Tool Gateway, and Defender, an open-source prompt injection detection library.

The company targets two groups: teams building AI agents into their products that need to reach customers' enterprise systems such as HRIS, ATS, CRM and LMS, and teams using off-the-shelf agents such as Claude Code or ChatGPT that need to act across their own business applications. It offers a free Starter plan with credits per seat, a Team plan at $600 per month, Enterprise plans, and an OEM Core tier for embedding StackOne in other products.

StackOne Technologies Limited is incorporated in England and Wales with registered offices in Newbury, Berkshire, and lists a San Francisco address. The website says it launched out of stealth in Q1 2023 and reports a $20M Series A. Open roles include engineering, sales and marketing positions in London and San Francisco.

Product: Managed AI agent integration platform with pre-built connectors, managed auth, MCP tool gateway, AI connector builder and prompt injection defense