1. Get your API key
Create an account on apinn.io — the free trial includes 5,000 requests / hour. Your key (pnk_…) is displayed in your account area.
2. Make your first request
Pass the key in theX-API-Key header on every call.
3. Explore the book
Next steps
API Reference
All endpoints and parameters.
Real-time stream
Receive deltas pushed via SSE.