{"pair":"eth/usd","timestamp_utc":"2026-06-24T20:57:28.367332+00:00","median_basis_pct":0,"median_carry_pct":-2.63,"regime":"FLAT","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}