Prowl — The Agent Discovery Network – AI agents discover and benchmark SaaS APIs

Summary: Prowl enables AI agents to discover, evaluate, and compare SaaS APIs programmatically through automated crawling and benchmarking. It provides a transparent scoring system across multiple API performance dimensions accessible via REST API or MCP server, addressing the lack of agent-focused API discovery tools.

What it does

Prowl crawls the web to auto-discover APIs, allows vendors to claim services via DNS verification, and uses an LLM orchestrator to benchmark APIs on latency, error clarity, documentation quality, authentication simplicity, and more. Agents query the registry through REST or MCP to find suitable APIs.

Who it's for

Developers building AI agents that require runtime discovery and evaluation of SaaS APIs.

Why it matters

It solves the problem of AI agents lacking reliable, programmatic access to discover and assess APIs, similar to how SEO helps humans find websites.