{
  "id": "fred.stlouisfed.org",
  "name": "FRED (Federal Reserve Economic Data)",
  "type": "signpost",
  "verdict": "self-documented",
  "why_no_deep_map": "官方文档完备，API 清晰，每个 series 自带标题/单位/频率注释，无隐藏接口",
  "quick_start": "curl 'https://fred.stlouisfed.org/graph/fredgraph.csv?id=DGS10&cosd=2025-01-01&coed=2026-03-14'",
  "csv_endpoint": {
    "pattern": "https://fred.stlouisfed.org/graph/fredgraph.csv?id={SERIES_ID}&cosd={START}&coed={END}",
    "auth": "none",
    "params": {
      "id": "series_id (如 GDP, CPIAUCSL, DGS10)",
      "cosd": "start date, YYYY-MM-DD",
      "coed": "end date, YYYY-MM-DD"
    }
  },
  "key_series": {
    "GDP": "Gross Domestic Product (quarterly)",
    "CPIAUCSL": "CPI — Consumer Price Index (monthly, SA)",
    "FEDFUNDS": "Federal Funds Rate (monthly)",
    "DGS10": "10-Year Treasury Yield (daily)",
    "DGS2": "2-Year Treasury Yield (daily)",
    "T10Y2Y": "10Y-2Y Treasury Spread (daily)",
    "UNRATE": "Unemployment Rate (monthly)",
    "M2SL": "M2 Money Supply (monthly)",
    "DEXUSEU": "USD/EUR Exchange Rate (daily)",
    "VIXCLS": "VIX Volatility Index (daily)"
  },
  "homepage_card": {
    "order": 40,
    "description": "官方 API 完备，无需逆向",
    "branches": [
      {"prefix": "CSV", "text": "fredgraph.csv?id={SERIES}&cosd={START}&coed={END}"},
      {"desc": "GDP · CPIAUCSL · DGS10 · FEDFUNDS · UNRATE · VIXCLS · M2SL · T10Y2Y"}
    ]
  },
  "last_verified": "2026-03-14"
}