Startup Log: APIs on macro econ data

What's include

Our market analysis page includes the following information:

• Alpha Vantage (economic indicators) docs
  • Federal Funds Rate: GET https://www.alphavantage.co/query?function=FEDERAL_FUNDS_RATE&interval={daily|weekly|monthly}&apikey=KEY
  • Treasury Yields: GET https://www.alphavantage.co/query?function=TREASURY_YIELD&interval={daily|weekly|monthly}&maturity={3month|2year|5year|7year|10year|30year}&apikey=KEY
  • CPI (headline index series): GET https://www.alphavantage.co/query?function=CPI&interval={monthly|semiannual}&apikey=KEY
  • Inflation (annual): GET https://www.alphavantage.co/query?function=INFLATION&apikey=KEY
  • Retail Sales: GET https://www.alphavantage.co/query?function=RETAIL_SALES&apikey=KEY
  • Durables: GET https://www.alphavantage.co/query?function=DURABLES&apikey=KEY
  • Unemployment: GET https://www.alphavantage.co/query?function=UNEMPLOYMENT&apikey=KEY
  • Nonfarm Payroll: GET https://www.alphavantage.co/query?function=NONFARM_PAYROLL&apikey=KEY
  • Intraday equities (optional alt source): GET https://www.alphavantage.co/query?function=TIME_SERIES_INTRADAY&symbol=SPY&interval=5min&outputsize=compact&apikey=KEY
  • Rate-limit note: free tier ~5 rpm. In our stack these are proxied live (no long cache).
• FRED (macro time series) docs
  • Generic: GET https://api.stlouisfed.org/fred/series/observations?series_id=SERIES&file_type=json&api_key=KEY[&units=pc1][&sort_order=asc|desc][&limit=N]
  • Series used:
    • Headline CPI YoY: series_id=CPIAUCSL with units=pc1
    • Core CPI YoY: series_id=CPILFESL with units=pc1
    • Core PCE YoY: series_id=PCEPILFE with units=pc1
    • Real GDP QoQ: series_id=A191RL1Q225SBEA
    • Real GDP (level, from 2015): series_id=GDPC1&observation_start=2015-01-01
    • 30Y Mortgage Rate: series_id=MORTGAGE30US
    • VIX: series_id=VIXCLS
    • Initial Jobless Claims: series_id=ICSA
  • Rate-limit note: ~120 rpm. In our stack: CPI YoY polled at 1 rps (round‑robin), Mortgage and GDP full series hourly cache.
• DB.NOMICS (ISM PMI) API
  • Manufacturing PMI: GET https://api.db.nomics.world/v22/series/ISM/pmi/pm?format=json&observations=true
  • Notes: we sanitize outliers outside 30–80 by replacing with 49.10; polled every 1s with in‑memory cache.
• Yahoo Finance via yfinance (S&P 500 intraday) docs
  • Symbol ^GSPC, interval 1m; refreshed every 60s server‑side; served from in‑memory cache for the dashboard price, change, intraday OHLCV.
• Caching cadence (server-side)
  • CPI YoY (CPIAUCSL, CPILFESL, PCEPILFE): 1 rps round‑robin
  • ISM PMI (DB.NOMICS): 1 rps
  • S&P 500 (^GSPC via yfinance): every 60s
  • Mortgage 30Y full series (MORTGAGE30US): hourly
  • Real GDP GDPC1 full series (from 2015): hourly
  • Other Alpha Vantage macro endpoints: proxied live (respect provider limits)