CME Group

CME Reference Data API

A set of JSON RESTful web service APIs that provide access to product and instrument reference data for CME Group, BrokerTec, EBS, hosted partners, and CME Group-cleared markets. Supports OAuth-secured access to product definitions, instrument metadata, market segment information, and trading hours used to power trading automation and risk systems.

GitHub

Documentation

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Documentation
https://www.cmegroup.com/trading/market-tech-and-data-services/cme-reference-data-api.html

Other Resources

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Reference
https://cmegroupclientsite.atlassian.net/wiki/display/EPICSANDBOX/CME+Reference+Data+API+Version+3
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Portal
https://www.cmegroup.com/market-data/market-data-api.html