API Playground

How to Use

1. Paste your API key in the authentication field (Bearer token or X-Api-Key header)
2. Try GET /api/v1/sources to list the catalog (authenticated returns full list, unauthenticated returns public sample)
3. Try GET /api/v1/entries?sources=vercel.changelog&limit=5 to fetch entries

Authentication

Free API keys (wcl_…) are available at watchchangelog.com/auth/login. No credit card required. 3 source slots.

Plans

• Free: 3 sources (no credit card)
• All: $9.99/mo (every source in catalog plus stdio MCP)
• Diff API: $49.99/mo add-on (requires All plan)

See watchchangelog.com/pricing for details.