At a glance
ProviderMassive (formerly Polygon.io)
TypeREST API
CategoryFinance & Macro
Real-timeNo — request/response
AuthAPI key
PricingFree tier (Basic, 5 calls/min, EOD); paid Stocks plans from $29/mo — Basic: $0/mo — 5 API calls/min, end-of-day data, 2yr history, economy/treasury endpoints included, Stocks Starter: $29/mo — unlimited calls, 15-min delayed, ~5yr history, Stocks Developer: $79/mo — unlimited calls, ~10yr history, Stocks Advanced: $199/mo — unlimited calls, real-time, 20+yr history
What data it provides
- U.S. Treasury yields across all maturities (1-month through 30-year), daily
- Realized inflation series — CPI and PCE
- Inflation expectations series
- Historical treasury records dating back to January 2, 1962
- Date-range filtering and sorting on every macro series
Features
- Daily updates on macro/treasury series across all plan tiers
- Economy endpoints included in every plan, including the free Basic tier
- Up to 50,000 results per request (defaults to 100)
- Deep history: treasury data back to 1962
- Official Python and other client SDKs (github.com/massive-com)
- Legacy api.polygon.io base still works in parallel with api.massive.com
Links
Use it in a bot
Other finance & macro data sources
