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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 the X-API-Key header on every call.

3. Explore the book

Every response returns quota headers: X-Quota-Limit, X-Quota-Remaining, X-Quota-Cost. See Rate limits.

Next steps

API Reference

All endpoints and parameters.

Real-time stream

Receive deltas pushed via SSE.