{
 "ticker": "NCSX-IS",
 "name": "NCSX Issuance Spread Index",
 "definition": "按发行规模加权的发行时点信用利差（票息减同期限国债插值），仅含美元计价、公开可查的 AI 基础设施发行人债券。",
 "as_of": "2026-11-04",
 "methodology": "v0.2.0-real",
 "data_status": "real_issuance",
 "constituents": 13,
 "issuers": 6,
 "notional_mm": 28057,
 "spread_bp": 432.3,
 "secured_spread_bp": 391.2,
 "unsecured_spread_bp": 540.1,
 "secured_notional_mm": 20307,
 "unsecured_notional_mm": 7750,
 "limits": "本指数为「发行时点」利差，不含二级成交价；日更二级利差需 TRACE 授权数据（v0.3.0 路线）。",
 "sources": [
  "https://home.treasury.gov/resource-center/data-chart-center/interest-rates/TextView?type=daily_treasury_yield_curve",
  "https://www.sec.gov/edgar"
 ]
}