[
  {
    "date": "2026-10-15",
    "tsy_10y": 5.1,
    "spread_low": 2.46,
    "spread_high": 3.33,
    "low": 7.56,
    "high": 8.43,
    "mid": 8,
    "basis": "HMDA 2025 middle half",
    "computed_at": "2026-10-19T17:00:00.000Z"
  }
]