Coinbase Derivatives Exchange (CDE) provides downloads for FIX, SBE, and REST:

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FIX Dictionaries

The FIX tarball includes the following files: 
cde-fix44-xml-dictionaries % tree
.
├── cde-fix44-dropcopy-api.xml
├── cde-fix44-market-api.xml
└── cde-fix44-orders-api.xml

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SBE Schemas

The SBE tarball includes the following files: 
cde-sbe-xml-schemas % tree
.
├── cde-sbe-market-api.xml
├── cde-sbe-orders-api.xml
└── cde-sbe-session-api.xml

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Archive

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FIX Archive

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SBE Archive

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REST Archive