Lightsage Raises $4M in Funding

Lightsage, a San Francisco-based startup building an Agent-Led Growth platform, has secured $4 million in a funding round. The company provides infrastructure for software businesses to track and optimize how autonomous AI agents discover, evaluate, and utilize their products, such as APIs and SDKs.

Investors

The round was led by Nexus Venture Partners. Additional participants included Steven Tamm, Abhinav Asthana, Matt Curl, Robert Chatwani, Hila, Zeno, Eric, Ivan, Shuhao, and Adam Frankl.

Lightsage Use of Funds

Lightsage plans to use the capital to deepen its agent evaluation, analytics, attribution, and optimization capabilities across various technical interfaces including APIs, SDKs, CLIs, MCP servers, and agent skills. The company also intends to grow its technical and commercial teams.

About Lightsage

Founded in 2026 by CEO Jun Liang Lee and CTO Sean Er, Lightsage provides an Agent-Led Growth platform designed to help software companies understand and improve product interactions with AI agents. The tool offers simulation-based testing and real-time analytics to ensure agents can successfully navigate documentation and product integrations.

Funding Details

Company Website: https://lightsage.com

Company: Lightsage
Raised: $4M
Round: Other
Funding Date: September 08, 2026
Lead Investor: Nexus Venture Partners
Additional Investors: Steven Tamm, Abhinav Asthana, Matt Curl, Robert Chatwani, Hila, Zeno, Eric, Ivan, Shuhao, Adam Frankl
Software Category: Developer Tools / AI Infrastructure
Source: https://www.globenewswire.com/news-release/2026/09/08/3357801/0/en/lightsage-raises-4m-to-build-the-growth-stack-for-internet-software-s-newest-customer-ai-agents.html