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This page provides information about upcoming changes to Coinbase International Exchange.

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2026-FEB-26

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Underlying Security Type

Introducing new underlying security type values which may be sent in instrument definition messages across REST, WebSocket, and FIX Market Data APIs. WebSocket and FIX Market Data APIs will also begin publishing underlying_security_type and UnderlyingSecurityType (Tag 310).
REST API, WebSocket Feed
The following new values may now be sent in the underlying_security_type field:
ValueDescription
EQUITYContract based on equity single stock
EQUITY_ETFContract based on equity ETF
EQUITY_INDEXContract based on equity custom basket or index
The above field is sent in:
  1. REST API’s List instruments endpoint
  2. REST API’s Get instrument details endpoint
  3. WebSocket Feed’s INSTRUMENTS Channel
FIX API, Market Data
SecurityDefinition (35=d) & SecurityList (35=y)
The following new values may now be sent in UnderlyingSecurityType (Tag 310):
TagNameTypeRequiredValues
310UnderlyingSecurityTypeSTRINGNEQUITY = CONTRACT_BASED_ON_EQUITY_SINGLE_STOCK
EQUITY_ETF = CONTRACT_BASED_ON_EQUITY_ETF
EQUITY_INDEX = CONTRACT_BASED_ON_EQUITY_CUSTOM_BASKET_OR_INDEX