Startup API-Rex Inc., operating as Lightsage, announced it has raised $4 million in seed funding led by Nexus Venture Partners. The round included participation from prominent angel investors, including Postman CEO Abhinav Asthana, DocuSign President Robert Chatwani, and Apollo GraphQL CEO Matt Curl. The company provides testing tools designed for “agent-led growth,” enabling software companies to market directly to autonomous AI agents.
As developer workflows shift toward automated coding agents like Claude Code, Cursor, and Copilot, traditional human-centric marketing and documentation are becoming less effective. Lightsage runs automated simulations across software agents to evaluate how effectively AI assistants can discover, authenticate, and integrate third-party developer software to execute technical workflows.
The platform identifies integration friction points—such as broken API endpoints, flawed authentication protocols, or poorly structured documentation—that prevent AI agents from using a vendor’s product. Currently focused on developer software, Lightsage provides vendor analytics detailing agentic web traffic and tool usage patterns.
Why it matters
Pioneers a new go-to-market category focused on optimizing software architectures for consumption by AI agents rather than human buyers.
Provides actionable diagnostic tooling to fix API authentication and documentation issues that block autonomous tool usage.
Signals a structural shift in developer tooling sales, where agent compatibility directly impacts software distribution.
Source: siliconangle.com
