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REST APIFinance & Macro

CME FedWatch API

CME FedWatch API is a rest api from CME Group providing finance & macro data. The CME FedWatch API delivers the industry-standard market-implied probabilities of FOMC rate-hike/cut/hold outcomes, derived from 30-Day Fed Funds futures pricing. A Polymarket bot uses it as the authoritative reference for Fed-decision markets, mapping the intraday 60-second probability stream directly onto FOMC/CPI/rate-cut markets to detect mispricing and trade reaction.

At a glance

ProviderCME Group
TypeREST API
CategoryFinance & Macro
Real-timeYes — streaming
AuthOAuth
PricingFree web tool; EOD API from $25/mo; Intraday API custom-licensed — Free: web access to FedWatch probabilities, charts and exports, End-of-Day REST API: from ~$25/mo, daily probabilities for macro research/reporting, Intraday API (60s updates): paid, licensing varies by use case (contact GAM/sales), Access entitled via CME self-service onboarding or Global Account Management (GAM)

What data it provides

  • Market-implied probabilities of FOMC rate-change outcomes (hike/cut/hold by basis points)
  • Implied target Fed Funds rate ranges for each upcoming FOMC meeting
  • Intraday probabilities recalculated at 60-second frequency from 30-Day Fed Funds futures
  • End-of-day probability forecasts refreshed on business days (~01:45 UTC)
  • Future and historical FOMC meeting dates
  • Queryable forecast history (intraday history from Nov 1, 2025)

Features

  • Intraday endpoint publishes updated probabilities every 60 seconds (near real-time)
  • Available Sun-Fri 5pm-4pm CT for live rates; historical queries 24/7
  • REST/HTTPS GET endpoints (latest forecast, forecast history, future/past meetings); CME markets data across REST and Websocket
  • OAuth 2.0 bearer-token authentication; no certification required
  • Production base URLs: markets.api.cmegroup.com/fedwatch_rt/v1 (intraday) and /fedwatch/v1 (EOD)
  • Industry-standard calculation directly comparable to Polymarket Fed-decision contracts

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 resources directory or the strategy database.
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