api-discoverylisted

# API Discovery & Intelligence Skill ## Overview Modern web applications — especially Single Page Applications (SPAs) — communicate almost entirely through hidden APIs. These APIs are never documented publicly, yet they power every feature: product listings, search, real-time updates, user authentication, notifications, and payment flows. This skill systematically discovers and maps these APIs, turning opaque frontends into transparent, analyzable systems. **Use Cases:** - **Competitive intelligence** — Understand how competitors build their products at the API level. What data do they expose? How do they paginate? What real-time features use WebSockets? - **Integration opportunities** — Find unofficial APIs that you can integrate with before official APIs exist (or when they never will) - **Security research** — Map the attack surface of a web application by understanding every endpoint it calls - **Architecture learning** — Study how successful apps architect their API layers, authentication flows, and real-time data systems - **Product building** — Reverse-engineer data models and business logic from API responses to build better competing products **Why This Matters for Startups:** When you see a competitor's polished UI, you only see 20% of the product. The API layer reveals the other 80% — the data model, the business rules, the scalability approach, the edge cases they handle. This skill gives you X-ray vision into any web application. --- ## Core Capabilities