StackOne, an AI-powered platform transforming SaaS integrations and enterprise AI agents, has secured $20 million in Series A funding led by GV (Google Ventures), with participation from Workday Ventures, XTX Ventures, and prominent angels from OpenAI, Deepmind, and Microsoft. The total funding now stands at $24 million and will be used to enhance StackOne’s proprietary tool-calling LLM, expand R&D, and scale platform integrations across more tools and use cases.
Built by former Google and Oracle engineers, StackOne addresses a major pain point in B2B SaaS: slow, complex, and resource-heavy integrations. By combining a real-time engine with an AI agent, the platform gives access to over 3,000 actions across 200 tools, reducing development time from weeks to days. This AI-first, enterprise-ready approach ensures speed, security, and scalability — key for enabling AI agents to work across modern enterprise stacks.
StackOne is already serving customers across three continents and powering over a billion API calls. With leading companies like Drata and Mindtools accelerating integration delivery through the platform, StackOne is positioning itself as the go-to infrastructure layer for the AI-powered future of SaaS.
Romain Sestier, co-founder and CEO, StackOne said:
“For over a decade, Guillaume and I have felt the acute pain of integrations. We’d see teams burn months rebuilding or refusing requests and nothing on the market eased this pain. So we, alongside a super talented and passionate team, built it ourselves. StackOne doesn’t just reinvent how integration platforms can and should be built – with depth, accuracy and security by default – but we believe AI agents are the missing piece in finally delivering enterprise-grade integrations at scale. It’s the platform we’d always dreamed of, built for the AI future of SaaS, and it’s a vision shared by the whole team. This shared experience has shaped a culture of innovation, collaboration and deep care for the product we’re building and it shows.”
Guillaume Lebedel, co-founder and CTO, StackOne added:
“Integrations are now table stakes for winning and keeping customers in B2B SaaS, especially for the ever-growing swathe of AI agents. You only need to look at the rise of standards like Model Context Protocol (MCP) to see the demand, but these protocols just aren’t fit for enterprise use by themselves – they’re a small piece of the puzzle. They lack security, accuracy and scale. They don’t work with multi-tenant systems, they’re too restrictive for the complex needs of big business, and they don’t go deep enough. StackOne solves all of this in a single layer; one that marks the birth of a new generation of integrations platform for an AI-first world.”