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REST APIFinance & Macro

Massive (Polygon.io) Economy REST API

Massive (Polygon.io) Economy REST API is a rest api from Massive (formerly Polygon.io) providing finance & macro data. REST endpoints from Massive (the rebranded Polygon.io, effective Oct 30 2025) serving clean, normalized U.S. macroeconomic series — treasury yields, realized inflation (CPI/PCE), and inflation expectations — alongside its broad stock/options/index market-data API. Useful to a Polymarket bot for pricing FOMC, CPI, and recession markets against authoritative rate and inflation data through one API.

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

Listed, not endorsed. Pricing and capabilities change without notice — check the provider's own documentation before you depend on anything here. Browse the full data feeds directory or the strategy database.
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