Get an API key.

Sandbox is for evaluating the data shape — not for production. You get one BTC snapshot per call, at any point in the last 14 days — pass the moment you want as a timestamp: GET /v1/chains/BTC?at=2026-08-15T12:00:00Z. Responses carry up to 100 instruments. Ranged history and bulk Parquet files are Pro. Upgrade to Pro within 30 days to keep API access; otherwise your key stops working until you upgrade. No credit card required for Sandbox.