Lightsage gets $4M in funding to help software makers sell directly to autonomous AI agents

Lightsage, a startup aiding software companies in selling to artificial intelligence agents, has secured $4 million in funding to promote "agent-led growth." The seed round, led by Nexus Venture Partners, also saw participation from notable angel investors such as Postman CEO Abhinav Asthana, DocuSign President Robert Chatwani, Apollo CEO Matt Curl, and former Salesforce CTO Steven Tamm.

Software developers are now selling products not just to humans but also to autonomous AI agents like Claude Code, Microsoft Copilot, and Cursor. These agents are increasingly choosing software on behalf of users, making it essential for developers to target these agents directly. Lightsage co-founder and CEO Jun Liang Lee explained that this shift changes the concept of growth, requiring a new approach to marketing.

The startup's platform runs simulations across multiple coding agents and answer engines, helping software companies view their offerings from the perspective of autonomous agents. It measures visibility and integrates tasks for agents to use their products. If an agent fails, Lightsage identifies the issue and suggests fixes. The company also provides analytics on agentic traffic and insights into agent usage, tasks, and frequency.

Lightsage currently focuses on developer software, as AI agents have already become widespread in this area. The startup aims to expand its team and capabilities across analytics, attribution, evaluation, and optimization, targeting APIs, software development kits, command-line interfaces, and agent skills. Eventually, Lightsage hopes to apply the agent-led growth concept to other areas like business-to-business software, cloud infrastructure, and automated payments.