{"pair":"btc/usd","timestamp_utc":"2026-06-24T20:51:18.261208+00:00","median_basis_pct":-0.022873,"median_carry_pct":-1.92,"regime":"BACKWARDATION","source_count":9,"preview":true,"note":"Paid endpoint includes per-exchange mark/index prices, basis, carry, and signature. Data cached — may be up to 60 minutes old.","preview_cached":true,"cache_max_age_minutes":60}